What are the types of welding technology?

Hello, welding methods are usually divided into fusion welding, pressure welding and brazing according to the different heating and pressure conditions during welding.

1, fusion welding

In the welding process, the metal at the weld of the weldment is heated to a molten state, and the welding is generally completed without pressure. When welding, the heat source makes the metal at the weld of the weldment and the filler metal added when necessary melt rapidly to form a molten pool, which extends with the movement of the heat source and forms a weld after cooling.

According to different electric heating methods, fusion welding using electric energy can be divided into arc welding, electroslag welding, electron beam welding and laser welding. Fusion welding is widely used in various welding methods, especially arc welding.

2, pressure welding

It is a welding method to connect the seams of weldments under pressure (with or without heating). In the process of pressure welding, generally no metal is added. According to the different welding mechanism, pressure welding can be divided into resistance welding, high frequency welding, diffusion welding, friction welding and ultrasonic welding.

Among them, resistance welding is the most widely used. Most pressure welding methods have no melting process, and there are no problems such as the burning of beneficial alloy elements and the immersion of harmful elements in the weld seam. However, the welding conditions of pressure welding are harsh and the scope of application is narrow.

3. Brazing

It is a welding method that uses the material (solder) with lower melting point than the weldment to bond the weldment and connect the seams of the weldment after cooling. Extended data

Welding characteristics:

1, molten metal falls due to gravity, and the shape and size of molten pool should not be controlled.

2. The steel bar is difficult to transport, and the surface of the weldment is not suitable for welding.

3. It is easy to produce defects such as slag inclusion, incomplete penetration, flash and poor weld formation.

4, molten weld metal splash diffusion, easy to cause burns.

5. The welding efficiency of overhead welding is lower than other positions.