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Methods of Welding

Feb 16, 2019

Resistance welding

It is used to weld thin metal parts, clamping between two electrodes by the welder parts through a large current melting electrode contact surface, that is, through the workpiece resistance heat to carry out welding.

Workpiece easy to deform, resistance welding through the joints on both sides of the welding, and laser welding only from the unilateral, resistance welding power needs to be often maintained to remove oxides and from the workpiece adhesion of the metal, laser welding thin metal bonding joints do not touch the workpiece, and the beam can also enter the conventional welding difficult to weld and the area, welding speed.

Argon arc welding

The use of non-consuming electrodes and protective gases, commonly used to weld thin workpieces, but the welding speed is slow, and the thermal input is much larger than laser welding, easy to produce deformation.

Plasma arc welding

Similar to Argon arc, but its torch will produce a compression arc to increase the arc mild energy density, it is faster than argon arc welding speed, melting depth, but less than laser welding.

Electron beam welding It relies on a beam of accelerated high-energy density electron flow impact on the workpiece, in the workpiece surface is very small dense product to produce a huge heat, the formation of  "small hole " effect, so as to implement deep melt welding. The main drawback of electron beam welding is the need for high vacuum environment to prevent electronic scattering, complex equipment, welding parts size and shape by the vacuum chamber restrictions, strict welding assembly quality requirements, non-vacuum electron beam welding can also be implemented, but due to electronic scattering and focus is not good effect. Electron beam welding also has magnetic offset and X-ray problems, because the electronic charge, will be affected by the magnetic field deflection, so the electron beam welder welding parts are required to be welded to the magnetic treatment. X-rays are particularly strong under high pressure and require the protection of the operator. Laser welding does not require a vacuum chamber and the workpiece welding before the demagnetized treatment, it can be carried out in the atmosphere, there is no anti-X-ray problem, so it can be operated online in the production line, can also be welded magnetic materials.