What are the classifications of electric welding? What are the classifications of electric welding?

The classification of electric welding is arc welding.

Resistance welding, high-energy beam welding, brazing, etc.

Electric welding refers to the use of electrical energy, through heating or pressurization, or both, and with or without filler materials, so that the weldment can achieve atomic bonding, the processing equipment used for electric welding is called electric welding machine.

The welding method is usually divided into fusion welding according to the different heating and pressurization conditions during welding.

There are three types of pressure welding and brazing.

1.Fusion welding is a method of heating the metal at the weldment seam to a molten state during the welding process, and the welding is generally completed without pressure. During fusion welding, the heat source quickly melts the metal at the weldment seam and the filler metal added if necessary to form a molten pool, which extends with the movement of the heat source and forms a weld after cooling.

Fusion welding using electric energy is divided into arc welding and electroslag welding according to different methods of electric heating.

Electron beam welding and laser welding.

Several. Fusion welding has a wide range of applications and is most commonly used in various welding methods, especially arc welding.

2.Pressure welding is a welding method in which weldment seams are joined together under pressurized conditions (heated or not). In the process of pressure welding, no filler metal is added. Pressure welding can be divided into resistance welding, high-frequency welding, diffusion welding, friction welding, and ultrasonic welding according to different welding mechanisms.

Wait. Among them, resistance welding is the most widely used. Most pressure welding methods do not have a melting process, and there is no burning of beneficial alloying elements and the immersion of harmful elements into the weld as is the case with fusion welding. However, the welding conditions of pressure welding are harsh, and the application surface is narrow.

3.Brazing is a welding method in which a material with a lower melting point than the weldment (brazing filler) is melted and bonded to the weldment, and the weldment seams are joined together after cooling.

In our country, welding operations need to be licensed, welders are the type of work that belongs to the access category, in the professional qualifications of skilled personnel, only five of the 81 types of work in the access category, welders are one of them, and the actual situation is that most of the industry practitioners are unlicensed operations. With the continuous standardization of technology and the relevant requirements of the industry, more and more people want to take a welding certificate, the advantage of the certificate is still very large, first of all, the salary of the certificate and the non-certificate are very different, often able to reach more than double or higher level. Therefore, the issue of short-term welder training has naturally become a concern for practitioners.

Welding as an industrial "tailor" is a very important means of processing in industrial production, the quality of welding plays a decisive role in the quality of the product, so, what is the future development of welding technology?

Industry outlook. With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery manufacturing and other industrial sectors, in China's economic development, welding technology is an indispensable means of processing. After entering the 21st century, welding is an important part of the manufacturing industry, and the rapid development, so it has brought unprecedented development opportunities to the welding industry.

At present, China consumes 300 million tons of steel every year (about tons of welded structure), and needs about 750,000 welding machines, and the welding industry will continue to grow in the next 8 10 years.

1. Arc welding.

Arc welding is currently the most widely used welding method. It includes: hand arc welding, submerged arc welding, tungsten gas arc welding, plasma arc welding, MIG/MAG welding, etc.

2. Resistance welding.

This is a class of welding methods that use resistance heat as energy source, including electroslag welding with slag resistance heat as energy source and resistance welding with solid resistance heat as energy source. Resistance welding includes: resistance spot welding, coating welding, seam welding, high-frequency welding, flash butt welding.

3. High-energy beam welding.

This type of welding method includes: electron beam welding and laser welding.

4. Brazing. The energy source for brazing can be either the heat of chemical reaction or indirect heat. It is the use of the melting point lower than the melting point of the welded material as the brazing metal, after heating to melt the brazing metal, by the capillary action of the brazing metal and into the joint contact surface of the gap into the wetting metal surface, so that the liquid phase and the solid phase diffuse each other to form a brazing joint.

5. Other welding methods.

These welding methods belong to different degrees of specialization, and their scope of application is narrow. It mainly includes electroslag welding and high-frequency welding with resistive heat as the energy source; Gas welding, pneumatic welding, and first-class welding with chemical energy as the welding energy source; Friction welding, cold pressure welding, ultrasonic welding, and diffusion welding with mechanical energy as the welding energy source.

Arc welding uses the heat of the arc to heat and melt the metal for welding. The welding arc is an intense, persistent gas discharge that generates a large amount of heat and intense light during this gas discharge. Usually the gas is not conductive, the real gas of the welding arc conducts electricity, converts the electrical energy into heat energy, and is used to heat and melt the metal, thus forming a welded joint, in order to make the gas conductive, the gas must be ionized.

The gas in the space where the welding arc is located is ionized, and the neutral gas molecules or atoms are dissociated into charged positive ions and negatively charged negative ions, and these two charged particles are precessioned towards the poles of the electric field respectively, so that the local gas conducts electricity and forms an arc.

Arc welding is welded using arc heat energy and melting metal. There are many welding methods: such as manual arc welding, submerged arc welding, gas shielded welding, etc., but the most used is manual arc welding.

Manual arc welding is achieved by manual operation. The manual arc welding process has the following characteristics: first, the process is flexible and adaptable; the second is welding; Third, it is easy to disperse stress and control deformation.

Because manual arc welding is convenient to operate and requires simple welding equipment, and can complete the welding of metal materials in different positions and different joint forms anytime and anywhere, manual arc welding is the most widely used in welding production. Manual arc welding equipment includes AC arc welders, rotary DC welders, and rectifier arc welders. Hope, thank you, thank you.

Electric welding can be divided into two welding, argon arc welding, brazing, etc.

There are mainly the following forms of welding: (1) Gas welding. The so-called gas welding is to use the high-temperature flame generated by the mixed combustion of oxygen and acetylene gas to melt the joint, so gas welding is also called oxyacetylene welding or gas welding.

2) Arc welding. It is a welding method that uses the arc to convert electric energy into heat energy, so that the welding rod metal and the base metal melt form a weld, and the electric welding machine used in arc welding is divided into two kinds: AC electric welding machine and DC electric welding machine, and the AC welding machine is mostly used for the welding of carbon copper pipes; DC welding machines are mostly used for the welding of stainless acid-resistant steel and low-alloy steel pipes. (3) TIG welding.

It is a welding method that uses argon as a shielding gas. During the welding process, argon forms a gas protective layer around the arc, so that the welding site, the tungsten pole and the welding wire are not in contact with the air. Because argon is an inert gas, it does not react chemically with metals, therefore, the alloying elements in the weldments and wires are not easy to be damaged during the welding process, and because argon does not melt into metals, it will not produce porosity.

4) Argon electric welding. It is the bottom and upper part of the weld that adopt two different welding methods, that is, the bottom of the weld is made of argon arc welding, and the upper part of the weld is covered by arc welding. This welding method can not only ensure the quality of the weld, but also save costs.

There are many kinds, such as melt welding, lead welding, pressure welding, and so on.

The main function of an electric welding machine is welding. But I have explored many other uses of this machine in years of design, manufacturing, and use. Some of the techniques are briefly described below:

1) In the maintenance of mechanical and electrical equipment, it is often encountered that the screws of the old equipment cannot be screwed, in this case, the welding machine can help a lot. The method is to adjust the current of the welding machine to the maximum and the voltage to the lowest.

Connect the shell with the ground wire of the electric welder, and use the welding pliers to hold a piece of carbon fine rod to connect it to the screw to be screwed. Power on for a few minutes until the screw heats up and reds, then stop the machine while it is hot, drop some oil or other oil, and screw it off after it cools down.

In the maintenance of electrical appliances encountered copper wire, copper bar and other special components, the parts can not be welded with open flame (gas welding), can be welded with low voltage, the current can be adjusted through the carbon rod to the welding part, can be used silver solder sheet or phosphor copper, solder and other additives for welding, can also make the copper wire itself welding.

3) When the motor is repaired and the coil is replaced, the low voltage and high current of the electric welding machine can be used to dry and drain the stator and rotor coil to replace the drying box.

Method: remove the end cover of the motor and pull out the rotor, tap the stator coil of the motor, such as ABC (head) and DEF (tail) together, connect the secondary power supply of the welding machine, and then adjust the current of the welding machine to control the temperature of the stator coil of the motor, and the rotor can also be inserted into the stator coil to adjust the temperature of the coil. This method is a time-saving, energy-saving, and labor-saving measure with fast heating, uniform humidity, and no choice of site.

1.Laser welding is a method of welding using a focused laser beam as an energy source to bombard the heat generated by the weldment. Due to the optical properties of laser such as refraction and focusing, laser welding is very suitable for the welding of micro parts and parts with poor accessibility.

Laser welding also has the characteristics of low heat input, small welding deformation, and is not affected by electromagnetic fields.

Due to the high cost of lasers and low electro-optical conversion efficiency, laser welding has not been widely used.

2.Electron beam welding refers to the use of accelerated and focused electron beams to bombard the welding surface placed in a vacuum or non-vacuum, so that the welded workpiece is melted to achieve welding. Vacuum electron beam welding is the most widely used type of electron beam welding.

3.Electroslag welding uses the resistive heat generated by the electric current through the slag as a heat source to melt the filler metal and the base metal, and solidify to form a firm connection between metal atoms.

At the beginning of welding, the welding wire and the welding groove are short-circuited and the arc starts, a small amount of solid flux is continuously added, and the heat of the arc is used to melt it to form liquid slag, and when the slag reaches a certain depth, the feeding speed of the welding wire is increased, and the voltage is reduced, so that the welding wire is inserted into the slag pool, and the arc is extinguished, so as to transfer to the electroslag welding process.

4.Arc welding refers to the use of arc as a heat source and the use of the physical phenomenon of air discharge to convert electrical energy into thermal energy and mechanical energy required for welding, so as to achieve the purpose of connecting metals. The main methods are electrode arc welding, submerged arc welding, gas shielded welding, etc., which is currently the most widely used and important fusion welding method, accounting for more than 60% of the total welding production.

There are many classifications of electric welding, such as manual electrode arc welding, tungsten argon arc welding, plasma welding, laser welding, ultrasonic welding, carbon dioxide gas shielded welding, submerged arc welding, pressure welding, etc.

There are many kinds of electric welding, and the common ones are automatic welding (also called submerged arc welding) and dioxide shielded welding.

Electrode arc welding, argon arc welding, gas welding.

1. Argon arc welding: the harm to the body is more serious, and the technical requirements and fatigue are high. 2. Second guarantee welder, handle welder; 3. Special welders: gas welding, 4. Resistance welders, spot welding; 5. Underwater welding and pressure vessel welding There are two main types of welding methods, namely self-fusing welding.

There are many kinds of electric welding, and the common ones are automatic welding (also called submerged arc welding), as well as dioxide gas protection welding, electrode arc welding, argon arc welding, and gas welding.

Submerged arc welding, oxygen welding, ion welding.

Classification of common welding methods.

1. Fusion welding. The method of partially heating two welded workpieces until melting to overcome the obstacle of bonding between solids, and then cooling and crystallizing into a single joint is called fusion welding.

According to the different heat sources used, the basic methods of fusion welding can be divided into arc welding, bolt welding, gas welding, thermite welding, electroslag welding, electron beam welding, laser welding, etc.

In the case of fusion welding, protection is implemented in the welding area in order to avoid deterioration of performance caused by the interaction between the hot metal and air in the welding area. There are usually three types of protection methods: slag making, shielding gas and vacuuming. Therefore, the form of protection is often another feature that distinguishes fusion welding methods.

2. Pressure welding. The welded workpiece is subjected to pressure (heated or not heated) measures in the solid state to overcome the influence of impurities such as unevenness and oxides on the connecting surface, so that the spacing between its molecules or atoms is close to the distance between the crystal lattices, so as to form an inseparable joint A type of welding method is called pressure welding, also known as solid phase welding. In order to reduce the deformation resistance of the material during pressurization and increase the plasticity of the material, pressure is often applied during pressure welding.

New welding equipment.

According to the different welding energies applied, the basic methods of pressure welding can be divided into resistance welding (including spot welding, seam welding, projection welding, butt welding), friction welding, ultrasonic welding, diffusion welding, cold pressure welding, ** welding and forging welding.

3. Brazing. The welding method of using some metal with a melting point lower than the melting point of the material to be connected (i.e., brazing metal) as the medium of connection, and using the diffusion between the material and the base metal to connect two welded workpieces together is called brazing. During brazing, it is usually necessary to remove dirt from the surface of the workpiece and increase the wettability of the filler metal, which requires the use of flux. The brazing metal must also be heated to melt the filler metal (but the workpiece does not melt).

According to the different heat sources, brazing methods can be divided into flame brazing, induction brazing, resistance furnace brazing, salt bath brazing and electron beam brazing. It can also be divided into two categories: hard brazing (melting point above 450) and soft brazing (melting point below 450) according to the different melting points of brazing metal. Protections are usually required during brazing, such as vacuuming, shielding gas and flux.