It is used to weld thin metal parts, and the welded workpiece is clamped between the two electrodes through a large current to melt the surface of the electrode contact, that is, the welding is performed by the resistance of the workpiece. The workpiece is easily deformed, the resistance welding is welded on both sides of the joint, and the laser welding is performed only from one side. The electrodes used for electric resistance welding are frequently maintained to remove oxides and metal adhered from the workpiece. Laser welding of thin metal lap joints is not When the workpiece is touched, the beam can also enter the area where conventional welding is difficult to weld, and the welding speed is fast.
Argon arc welding
Non-consumable electrodes and shielding gases are used to weld thin workpieces, but the welding speed is slow, and the heat input is much larger than laser welding, which is prone to deformation.
Plasma arc welding
Similar to the argon arc, but the torch produces a compression arc to increase the arc temperature and energy density. It is faster than argon arc welding and has a deeper penetration, but is inferior to laser welding.
Electron beam welding
It relies on a beam of accelerated high-energy density electrons to strike the workpiece, creating a huge heat in the small surface of the workpiece, forming a "small hole" effect, thereby implementing deep-fusion 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 limited by the vacuum chamber. The quality of the weldment assembly is strict. Non-vacuum electron beam welding can also be implemented, but due to electronics. Scattering and focusing are not good enough to affect the effect. Electron beam welding also has magnetic offset and X-ray problems. Because of the electron charging, it is affected by the magnetic field deflection. Therefore, the electron beam welding workpiece is required to be demagnetized before welding. X-rays are particularly strong under high pressure and require protection from the operator. Laser welding eliminates the need for a vacuum chamber and demagnetization of the workpiece before welding. It can be carried out in the atmosphere without X-ray protection, so it can be operated in-line or in a magnetic material.