Features of electric arc cutting of metal
Electric arc cutting is usually done by hand. For work, it is recommended to use steel electrodes with a thick refractory coating, but tungsten and carbon electrodes can also be used.
For this method of metal cutting you do not need to have special equipment. Work can be carried out in hard-to-reach places and in any spatial position of the structure.
However, when separating metal with an electric arc, it is not possible to achieve high quality. It is impossible to ensure the evenness of the edges of the parts and there is a large amount of slag release. Therefore, for further use of the obtained metal parts, their mechanical processing is necessary. The productivity of this method remains low.
Special attention must be paid to safety precautions. The welder must be carefully protected from drops of metal and slag. It is worth considering where the molten metal will flow to avoid fire.
Directory
Wholesale reinforcement Reinforcement
in bulk to create reinforced concrete structures, which are manufactured directly at reinforced concrete factories or directly at construction sites.
Galvanized sheet
The most popular is thin-sheet galvanized steel sheet - the thickness of such a sheet ranges from 0.5 to 2.5 mm. Sheet width ranges from 710 to 1800 mm.
Galvanized rolled products
Among the products produced by the modern metallurgical industry, there is galvanized rolled steel , which includes metal products coated with a layer of zinc.
Galvanized sheet
Galvanized sheet is made from cold-rolled coiled steel. Taking into account the conditions for its further use, it is produced corrugated, smooth, corrugated, painted, which is achieved by special methods of steel processing.
Hot-dip galvanized steel
In the modern metal rolling market, galvanized rolled products . It comes in a wide range: sheets, circles, tapes, corners, pipes, etc.
High-quality fittings A500C
Construction reinforcement is a type of rolled metal, which includes A3 reinforcement and A500C reinforcement . Both of these classes are produced from high-quality steel by hot-rolling and are a periodic profile with a smooth or corrugated surface.
Modern fittings A500S
A500S fittings belong to the construction type of rolled metal. Its application is wide: reinforcement of walls and floors in office and residential premises, construction of high-rise monolithic reinforced concrete buildings, production of any frames, metal meshes, etc.
A3 fittings and A500C fittings
Reinforcement is hot-rolled steel of round section, periodic or smooth profile . During construction work, a kind of frame is constructed from it, poured with concrete.
A3 reinforcement and structural strength
Construction reinforcement is metal rods made of hot-rolled round steel with a corrugated or smooth surface; they are used for the manufacture of reinforced concrete structures and enhance the strength characteristics of concrete.
Construction fittings А500С
A500C reinforcement is a type of A3 reinforcement and is intended for strengthening conventional or prestressed reinforced concrete structures. This type of reinforcement gives reinforced concrete additional strength and protects it from deformation.
A500S fittings
A3 fittings are made from round hot-rolled steel of periodic profile. Construction reinforcement A3 with a diameter of less than 10 mm is formed into coils for ease of transportation, and with a diameter of more than 100 mm it is produced in rods, the length of which is from 6 to 12 m.
Application of reinforced concrete reinforcement
Reinforced concrete reinforcement is not only a common type of rolled product used in construction, but also a real “lifesaver” for an experienced and skillful owner. The reinforcement is not necessarily part of the reinforced concrete structure (where, as a rule, steel reinforcement is used for reinforced concrete structures), but is also actively used in homestead farming and small industrial enterprises. So how can you use reinforced concrete reinforcement?
Construction fittings wholesale
Limited Liability Company "Metallaktiv" accepts applications for the wholesale sale of reinforcement and delivers it directly from the manufacturer, where construction
reinforcement wholesale is presented in a wide range: in coils and rods, of various diameters and the most popular brands.
Hot rolled special profile
Special hot-rolled profile is a long-rolled metal product, among which hot-rolled steel strip is produced. It is used not only for the manufacture of special profiles, for example, a bent channel or angle, but also for creating a variety of structures.
LED lights
Energy-saving LED elements are increasingly replacing traditional lighting and illumination sources in various areas of everyday life and production. LED lighting has become in demand because of its advantages - energy saving, long service life, environmental safety, no negative impact on vision, ease of use in hard-to-reach places.
Ventilation installation
In order for us to always feel comfortable while indoors, the structure must be equipped with a reliable ventilation system. It is very important that the air in the room is sufficiently enriched with oxygen, and the temperature is optimal for life.
Interior table clock HERMLE - the perfect combination of fashion and tradition
Watches from the German brand HERMLE are very popular in Europe. Their price range is so wide that people with any income can choose a suitable model. Regardless of the price level, the quality of Hermle watches is always at its best. HERMLE watches occupy leading positions in the Russian and global markets.
Redevelopment of apartments
Often, when purchasing housing, we are faced with the problem that the layout of the apartment does not correspond to our concept of a comfortable home. Perhaps this is a former communal apartment, an apartment in a monolithic building, where almost every wall is load-bearing, bathrooms with an area of 3 square meters, a kitchen in which it is impossible for two residents to pass each other, corridors that occupy a third of the housing area, and simply small apartments.
Painting a car in a car service center
The color of a car can say a lot about the owner's character. Also, a lot can be learned by taking a closer look at the quality and safety of the car’s paint and varnish coating.
Body repair
Car service services in our country are now in great demand. The car has gradually become a fairly common means of transportation, and many of us prefer our own transport to public transport. Every day, millions of cars of domestic and foreign brands drive onto the country's roads.
Handmade cue or mass-produced cue?
The term "handmade cue" conjures up images of an old craftsman's workshop carving a cue with his bare hands using a few simple tools, but in reality it's anything but. Manufacturers of cues can be clearly divided into two categories...
Driving instructor
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Apartment in a new building
The desire to escape from the outback, to exchange a quiet provincial life for life in a large metropolis today is inherent not only in young people, but also in more mature people who have already achieved a lot in life and career, and who want to reach even greater heights.
Insurance of special equipment
Insurance is a necessary procedure for those who want to avoid financial problems with transport, real estate or health in the future. Many unforeseen situations happen in life, and at any moment significant damage can be caused to property.
Real estate in Turkey
The Mediterranean is the region in which Russians make the vast majority of their foreign property purchases. The Spanish Costa del Sol and the French Cote d'Azur, Italian Sardinia and Croatian Istria - all these popular destinations are located on the shores of the Mediterranean Sea or its inland seas. Everything is good at these resorts - the climate, the infrastructure and the variety of offers. It’s just that it’s a little expensive, and that’s why many are looking for a Mediterranean alternative...
Porcelain tile Italon
Among the variety of modern building and finishing materials, there are those whose use in finishing immediately gives the building a unique style and increases the status and prestige of the owner.
Equipment for canteens. Dining room project. Distribution lines.
Let us immediately clarify that equipment for canteens is somewhat different from restaurant household appliances, this is facilitated by the very specifics of this food establishment. There is an opinion that a dining room is a cafe, only in a slightly simplified version.
certificate of good conduct
A police clearance certificate may be needed both in Ukraine (for example, when applying for a job) and outside it (training, employment, marriage abroad, long-term visas).
Renting an online spare parts store - an affordable start to a business
The modern market dictates completely different conditions than before: today the Internet is used to sell goods and services as efficiently as possible. Regular spare parts stores are gradually losing their customers, since the purchase of the same spare parts through online services can be made from any place where there is access to the Internet.
Septic tank for a summer residence
A modern country house or cottage is not only a favorite place for a summer vacation for the whole family. Today, a very large number of families choose a country house as their permanent home.
Blood chemistry
A modern biochemical blood test allows us to draw a conclusion about a person’s health status with a high percentage of reliability. Standard standards for biochemical blood analysis are a set of indicators, the presence of which in the blood of every person is mandatory at a certain age period of his life.
Body repair
Modern roads are full of surprises, and sometimes cars get damaged, both minor and serious. The car body is the most important element, which is designed to protect the internal components and parts of the car from external factors, as well as the driver and passengers.
Holidays in the Moscow region in elite conditions
Modern businessmen value elite family vacations in the Moscow region for their high quality of service and close location to the city. However, ordinary residents of the capital have already managed to appreciate the convenience and effectiveness of a good vacation near Moscow.
Concrete mixer. Choosing household concrete mixers.
Modern construction cannot exist without precision machines, without their constant improvement and introduction of innovations. Nowadays, construction is gaining momentum, and along with the demand for this industry, there will always be a demand for concrete mixers.
Apartment interior design
Our own house or apartment is our personal territory, where we take a break from work, relax, and gain strength for important things. We arrange this area according to our taste. And, of course, we try to make sure that, first of all, nothing in the decoration of a house or room irritates us - not the color of the wallpaper in the dining room, not the bright light in the bedroom, not the sound of water flowing in the bathroom.
Two-story brick houses
Today, many of us are thinking about changing a standard apartment in a city high-rise building to our own, city or country house. The advantages of living in a private house are numerous - silence, privacy, independence from city heating systems, no problems with neighbors, the presence of a personal plot.
Team of Muscovites builders k-see.ru
Where to start the renovation? Buy finishing materials, hang wallpaper and paint the doors... This, of course, will freshen up the apartment a little, but what if the wallpaper starts to peel off because the walls were not properly puttied? Or the paint will start to crack and fall off because it was painted in several layers, including the first layer twenty years ago...
Nonwovens and geotextiles
With the development of the construction industry, new technologies for the production of building materials appear. In the construction of drainage systems, strengthening embankments and slopes, laying tunnels and roads, geotextiles and non-woven materials such as geotextiles are used. This material is a high-strength textile fabric, water- and breathable, made from synthetic polymer fiber.
Online auto parts store - yes or no?
Every day the Internet has an increasing influence on the lives of each of us. And this is not surprising, because on the Internet you can find the answer to any question. Online stores are becoming more and more popular, this is facilitated by convenience and a minimum of time for purchasing certain goods. Let's look at all the pros and cons of buying spare parts for foreign cars online.
Apartment renovation in Kyiv
Apartment renovation in Kyiv? Problem number one is choosing a team of workers. Start by asking all your relatives, friends, and colleagues. Make the most of their circle of acquaintances - probably at least one of them has already done renovations and - what luck! – I’m pleased with the result. The only thing better than a personal recommendation is your personal experience.
Rubber products - V-belts and conveyor belt
Rubber and various rubber products are present in many mechanisms, ranging from simple to more advanced technology. Rubber is a unique material, which is why it is used in a variety of areas, from serious industry to pharmacology.
Features of the working process of diesel engines. Part 2
The method of mixture formation determines the design of the combustion chamber of a diesel engine. Depending on the design of the combustion chamber, there are several types of high-speed diesel engines, which are divided into engines with undivided combustion chambers, called engines with direct fuel injection, and engines with separated chambers of the pre-chamber and vortex types.
European-quality renovation of apartments in Moscow
About ten years ago, a new word entered our vocabulary - “European-quality renovation”. The "euro" part of the word no doubt means "European". That is, this is a professional renovation of an apartment or office space using foreign technologies and equipment, the latest imported construction and finishing materials, which is a complex of works along with the development of a design project.
Crushing and screening plants
When developing industrial deposits, in construction, especially when the object under construction is frequently moved, for example in road construction, crushing and screening equipment and quarry equipment are used.
Beam crane
To carry out movements inside a workshop or production workshop, as well as to carry out heavy installation work, overhead cranes are used - a beam crane.
Window sills
A window sill in a modern, comfortable apartment is not just part of the window opening, but an element of the interior, and even part of the furnishings. For example, back in the 19th century, in Russian estates, the window sill served as a couch, and the mistress of the house often spent her leisure time sitting on the windowsill with a book in her hand.
PVC window repair
Plastic windows made of PVC profiles today have ceased to be a luxury item. They are installed everywhere, since in most high-rise buildings old wooden windows become completely unusable. New windows made of plastic profiles have many advantages.
Parquet scraping
Parquet is one of the elite types of flooring. And, like any wood flooring, parquet requires special care and repair. The more attention you pay to caring for your parquet floor, the better its surface will be preserved, and repairing it will not take much time and money.
Main models of domestic automobile diesel engines
Domestic serial diesel engines are similar in design. All of them have direct fuel injection. They are based on the same type of layout with a V-shaped arrangement of cylinders cast in one block.
Screw compressors
The main common types of air compressors are screw compressors and piston compressors. Today, the choice of compressor equipment is a pressing task for many enterprises. After all, the effectiveness of work related to compressed air and their cost depend on the correctness of the choice made.
Bimetal Radiators Press
LLC "Press" has been producing heating radiators for more than 10 years. At the production facilities of the Bolshevik plant, located in the center of Kyiv, Press LLC produces steel and bimetallic sectional heating radiators.
Renovation of apartments
One way to change your life a little, add newness and freshness to the world around you is to renovate your home. However, not everyone views the prospect of many months of work, alternating with trips to construction supermarkets and markets, with enthusiasm and enthusiasm.
Granite sinks
Setting up a new kitchen begins with installing a sink. Quite often, the sink is called the business card of the housewife. This element of any kitchen interior is used repeatedly throughout the day. Therefore, in order for the kitchen not only to fulfill its functional purpose, but also to make the kitchen interior attractive, it is necessary to take the choice of sink seriously.
What is an estimate?
Nowadays, in order to begin the construction of structures, an estimate is required. Currently, the computer program “Expert - Estimate” is used to generate construction papers. High-quality SCS provides the ability to enter lists with simultaneous calculation of the construction price.
Bathroom renovation
Not a single room - be it a house, an apartment, an outbuilding - can be called residential if it does not have a bathroom, or the so-called “bathroom”. Housing must be equipped with running water and sewerage. And of course, everyone wants the bathroom to be warm, cozy and comfortable.
Accessories for metal-plastic windows
The most famous company producing accessories for metal-plastic windows is Roto. They have been leading manufacturers of fittings for metal-plastic windows for many decades. During this time, this manufacturer has proven itself only from the best side.
Anti-freeze - non-freezing liquid
Probably no driver needs to be proven how important a clean windshield is. The safety, and sometimes even the life of the driver and passengers, depends on how good the visibility and visibility in the car is.
Environmentally friendly fuel
The production of pellets includes a huge number of stages of processing waste from the wood processing industry, as a result of which we obtain environmentally friendly fuel.
Guillotine shears for metal
At enterprises that produce various metal products, special tools and equipment are used. The range of these devices numbers in the dozens, but there are also devices that no company working with steel, copper, aluminum and other metals can do without.
Choosing an entrance door
Many will confidently say: “My home is my fortress,” but this does not always work out, because any fortress must have high-quality gates, and in our case, doors. It is precisely the door that becomes the first obstacle in the way of intruders, and the safety of you and your home will depend on the extent to which it is difficult to overcome.
Kitchen furniture to order
Furniture is an integral part of the interior of a house or apartment. The selection and purchase of furniture should be treated with great responsibility. It is the furniture that helps to conveniently organize the space of the room. The modern developing furniture industry strives to satisfy all the needs of its potential customers.
Commercial equipment for stores
Any modern manufacturing or commercial enterprise requires high-quality and convenient retail equipment that performs various functions - commercial furniture makes the work of staff easier and literally improves the premises.
Car for travel
The best way to relax, unwind and get a lot of fresh impressions is to go on a trip. What to do if the “plane - five-star hotel - beach - bar - party” scheme has already set your teeth on edge? You need to try another type of travel - traveling by car, in the company of family and friends.
Clinker steps
The staircase is one of the most important and complex architectural elements. Stairs are installed at the entrance to the house, from the facade, or stairs are built inside the house if it is multi-story or multi-level.
Water purification equipment - features of choice
Today, no one doubts how necessary water purification is, since any large city daily discharges tons of waste into the environment, most of which ends up in water bodies, and from there into our water supply. It's up to you to decide what you will use for cleaning - a simple filter jug or a purification system for drinking and household water.
Equipment for EKG 5 and EKG 8 excavators
The working equipment of a bucket excavator includes a bucket, boom and handle. These are the main working parts of the EKG 5A and EKG 8I excavators. Guide devices, pulleys and ropes that transmit movement to various elements of work equipment are also part of the work equipment.
Selecting a manipulator for cargo transportation services
It is known that not every transport company in Moscow, and especially not every private person, can afford to buy a manipulator. The list of services of our company, among other things, also includes the rental of special equipment, in particular a manipulator. We have a fleet of vehicles that always has the necessary special equipment available.
Expanded clay
It is known that natural building materials maintain a healthy indoor microclimate much better than synthetic ones. This applies to both main building materials and auxiliary materials - insulation, waterproofing, moisture regulators, fillers.
Belik Taras: wallpaper or painting?
What is better to choose for wall decoration – wallpaper or paint? This question does not have a clear answer; it is necessary to approach its solution by considering many nuances. First you need to decide on the purpose of the room in which the walls will be decorated.
Volvo parts
If you are a connoisseur of Scandinavian style and quality, then, undoubtedly, your car is a Volvo.
Volvo S40 is a worthy representative of the world famous Scandinavian brand. Not long ago, this model, considered the most affordable and affordable in the line, was restyled. News 1 - 70 of 539 Home | Prev. | 1 | Track. | End | All
Scope of application
Electric arc cutting is used only if the necessary equipment for gas cutting is not available.
This method is used to get rid of small excess metal blanks and correct defects by surface melting them. Non-ferrous products, high-alloy steels, as well as cast iron and various alloys can be used for arc cutting with an electrode.
Arc cutting technology
Arc cutting technology
Several methods of cutting metals (steel, cast iron, non-ferrous metals) with an electric arc have been developed and are used.
1. Arc cutting of metals is carried out using:
1) metal consumable electrode. This method consists of melting the metal using a higher current (30–40% more than arc welding).
An electric arc is excited on the upper edge at the beginning of the cut and gradually moves it down along the edge (Fig. 73).
Drops of liquid metal are pushed out by the visor of the electrode coating. In addition, it insulates the electrode, preventing it from shorting to the metal.
Rice. 73. Scheme of cutting with a metal consumable electrode
Cutting in this way has a number of disadvantages, in particular, it has low productivity and produces a poor-quality cut. The modes under which cutting is carried out are presented in table. 39;
Approximate modes of cutting metal with a consumable electrode
2) carbon electrode. This method is used when cutting cast iron, non-ferrous metals and steel when there is no need to strictly observe all dimensions, and the quality and width of the cut do not play any role. In this case, the cutting is carried out by melting the metal along the cutting line. Cutting is carried out with direct or alternating current from top to bottom, placing the surface to be melted at a slight angle to the horizontal plane to facilitate the flow of liquid metal. Cutting modes are presented in table. 40.
3) a non-consumable tungsten electrode in an argon environment. This cutting method is rarely used, mainly when working with alloy steels and non-ferrous metals. Its essence lies in the fact that a current is supplied to the electrode, the value of which exceeds that during welding by 20–30%, and the metal is melted through.
Approximate cutting modes for steel with a carbon electrode
2. Oxygen-arc cutting (Fig. 74). In this case, the metal is melted by an electric arc, which is excited between the product and a rod electrode made of low carbon or stainless steel (outer diameter - 5-7 mm, internal - 1-3.5 mm), after which it burns in a stream of oxygen supplied from holes in the tube and oxidizes the metal, and is blown out. Oxygen-arc cutting is used mainly for underwater work.
Rice. 74. Diagram of equipment for an oxygen-arc cutting station: 1 – power source (transformer); 2 – regulator; 3 – switch; 4 – cable; 5 – electric holder; 6 – electrode; 7 – cutter RGD-1–56; 8 – oxygen hose; 9 – oxygen cylinder; 10 – gearbox
3. In air-arc cutting (Fig. 75), the metal is melted by an electric arc excited between the product and a carbon electrode (plate or round), and removed with a jet of compressed air.
Rice. 75. Scheme of air-arc cutting: 1 – cutter; 2 – air stream; 3 – groove; 4 – electrode
The cutting process is carried out using direct current of reverse polarity (with direct polarity, the heating zone is wider, which creates difficulties in removing metal) or alternating current.
The current value is determined by the formula:
K – coefficient 46–48 and 60–62 A/mm for carbon and graphite electrodes, respectively;
d – electrode diameter.
For this method, special cutters are used, which come in two types and therefore require different cutting modes:
? cutters with sequential air jets;
? cutters with an annular air jet.
Air-arc cutting is divided into two types, which correspond to different modes (Tables 41 and 42):
? surface gouging, used for cutting defects formed in the metal or weld, trimming the root weld and chamfering;
? separation cutting used in the processing of stainless steel and non-ferrous metals.
Approximate modes of surface air-arc cutting
Approximate modes of separation air-arc cutting
4. Plasma-arc cutting, the essence of which is that the metal is melted by a powerful arc discharge concentrated on a small area of the surface of the metal being cut, and is removed from the cutting zone by a high-speed gas jet. The cold gas entering the torch flows around the tungsten electrode and in the discharge zone turns into plasma, which then flows through a small hole in the copper nozzle in the form of a brightly luminous jet at high speed and temperature reaching 30,000 ° C (or more). The schematic diagram of plasma-arc cutting is shown in Fig. 76.
Plasma cutting can be carried out with an independent or dependent arc. In this case, they talk about a plasma arc of direct or indirect action.
The cutting modes that you can focus on are clearly presented in table. 43.
Rice. 76. Scheme of the plasma-arc cutting process: 1 – electrode; 2 – water-cooled nozzle; 3 – external nozzle; 4 – plasma jet; 5 – metal; 6 – insulating washer; 7 – ballast resistance; 8 – power supply
5. Arc cutting under water. In a liquid medium, for example in water, it is possible to create a powerful arc discharge, which, having a high temperature and significant specific thermal power, can evaporate and dissociate the liquid. The arc discharge accompanies the formation of vapors and gases, which will enclose the welding arc in a gas shell, i.e., in fact, the arc will be in a gaseous environment.
Approximate modes of plasma-arc cutting of two types of material
Carbon and metal electrodes will provide a stable welding arc from standard power sources.
To cut underwater, they must be coated with a thick waterproof (paraffin-impregnated) coating, which, when cooled from the outside by water, will melt more slowly than the electrode rod. As a result, a small cup-shaped visor is formed at its end, thanks to which the stability of the gas shell and arc combustion will be ensured.
The current value is set at the rate of 60–70 A per 1 mm of electrode diameter.
The described cutting method is used when repairing ships, etc.
This text is an introductory fragment.
Continuation on liters
Methods used
The electric arc is actively used not only for welding, but also for cutting metal. There are several types of arc cutting of metal parts: manual arc cutting with consumable and non-consumable electrodes, as well as air and oxygen-arc cutting.
Arc cutting with non-consumable electrode
With this method, work is carried out on both alternating and direct current of direct polarity. The current should be 400-800 A. Carbon and graphite electrodes are used.
This method is not so widely used. It is used for dismantling large-sized scrap metal, making holes and burning out rivets, as well as for dismantling unnecessary metal structures.
The cut is made by melting the metal in the required area, and not by burning it. Thanks to this quality, it becomes possible to work with materials that cannot be cut with gas, such as cast iron or high-alloy steels.
This method is not characterized by high precision of work : the width of the cut itself is large, and the edges remain uneven. If you use electrodes with a rectangular cross-section, you will be able to slightly improve the result.
Consumable electrode arc cutting
This method allows for greater precision and cleanliness, and the cut itself is narrower than the previous method. For cutting, the same electrodes and the same diameter are used as for welding, while increasing the current strength by 20-30%. When carrying out similar work at home, you can use simple electrodes, but to improve the work process, it is recommended to purchase special electrodes with a special coating.
There are two types of coating compositions. First: manganese ore (98%) and potash (2%). Second: manganese ore (94%), kaolin (3%), marble (3%). Thanks to this coating, the stability of the arc increases, the inner rod melts more slowly and its insulation from the walls of the cut is ensured. The molten metal is oxidized, thanks to the special components contained in the coating, which speeds up the cutting process.
The production of the above electrodes is carried out from wire with a diameter of 3 to 12 mm and a length of up to 300 mm. The thickness of the special coating should be 1-1.5 mm. The current strength is calculated from the following ratio: 55-65 A per 1 mm of the diameter of the electrode used.
Air and oxygen arc cutting
This method of separating metal parts differs from the previous ones in that the metal molten by an electric arc is immediately blown out with a stream of compressed air or pure oxygen. Typically, this method is used to get rid of welding defects and separate stainless steel workpieces with a thickness of no more than 20 mm.
Due to the supply of oxygen, partial burnout of the metal occurs, accompanied by the release of additional heat, which can significantly speed up the smelting process. This method is used if it is necessary to make a short cut on any building structure.
Separation is carried out with a graphite or steel electrode at constant current using special cutters. The electrode should be no thinner than 4-5 mm, coated with OMM-5, TsM-7 or OSZ-3. The current strength can reach up to 250A and allows you to cut metal up to 50 mm thick. Compressed air is supplied from the side with a pressure force of 0.4-0.5 MPa. The average oxygen consumption varies from 100 to 160 l/min.
Scheme of air-arc cutting of metal
If you use a RGD type cutter, then the electrode holder is held in the right hand, and the cutter itself is held in the left. As soon as the metal begins to melt, a stream of air is applied to it and blows it out.
Electric arc welding technology
Electric arc welding technology is simple. The welding machine is connected to the network. One cable is connected to the part, and the second to the electrical holder with the electrode. The end of the electrode is tapped on the surface of the metal, exciting an arc. An arc is formed between the electrode and the metal being welded. The arc instantly begins to give off heat, melting the edges of the metal and the electrode itself (if it is consumable). As a result, a weld pool is formed.
It mixes the molten electrode and the base metal. They fill the joint between two parts, and after cooling, a strong, permanent connection is formed. In this case, so-called slag can form on the surface of the weld. To perform welding, you can use consumable and non-consumable electrodes or wire. The choice depends on the arc welding technology you choose. For example, in manual arc welding, consumable electrodes are most often used. And for semi-automatic welding - consumable or non-consumable wire.
If you do not know how to maintain a stable arc, you can use special electrodes or welding wire. They must contain sodium, potassium or calcium. These elements stabilize the arc due to their ionizing properties.
Shielding gas can be used to protect the welding area from oxidation. For example, argon or carbon dioxide. Such gases are supplied directly to the weld pool, protecting it from oxygen from the atmosphere.
Electric arc welding can be carried out with both direct and alternating current. We recommend using direct current, since the metal will splatter less and the seam will be of much better quality. If you are a beginner, then DC operation is a must.
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