There are many welding techniques, such as resistance welding, argon arc welding, electric beam welding, plasma welding, etc. So what is the difference and difference from them?
1) Resistance welding: It is used to weld thin metal parts, clamp the workpiece to be welded between two electrodes and melt the surface of the electrode contact by a large current, that is, welding is performed by the resistance heating of the workpiece. The workpiece is easy to deform. Resistance welding is welded on both sides of the joint, while laser welding is only performed on one side. The electrodes used in resistance welding need to be maintained frequently to remove oxides and metal adhering from the workpiece. Laser welding of thin metal lap joints is not In contact with the workpiece, the beam can also enter the area that is difficult to weld by conventional welding, and the welding speed is fast.
2) Argon arc welding: using non-consumable electrodes and shielding gas, it is often used to weld thin workpieces, but the welding speed is slower, and the heat input is much larger than laser welding, which is prone to deformation.
3) Plasma arc welding: similar to argon arc, but its welding torch will produce a compressed arc to increase the arc temperature and energy density. It is faster than argon arc welding and has a greater penetration depth, but is inferior to laser welding.
4) Electron beam welding: It relies on a beam of accelerated high-energy density electrons to hit the workpiece, which generates huge heat in a small dense area on the surface of the workpiece, forming a "small hole" effect, thereby implementing deep penetration welding. The main disadvantage of electron beam welding is that it requires a high vacuum environment to prevent electron scattering. The equipment is complicated. The size and shape of the weldment are restricted by the vacuum chamber. The assembly quality of Korean parts is strictly required. Non-vacuum electron beam welding can also be implemented. Scattering and poor focusing will affect the effect. Electron beam welding also has magnetic offset and X-ray problems. Because the electrons are charged, they will be affected by the deflection of the magnetic field. Therefore, the electron beam welding workpiece is required to be demagnetized before welding. X-rays are particularly strong under high pressure, and operators need to be protected. Laser welding does not require a vacuum chamber and demagnetization treatment before welding the workpiece. It can be carried out in the atmosphere, and there is no problem of X-ray protection, so it can be operated online in the production line and can also weld magnetic materials.
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