High power laser deep penetration welding and traditional welding methods

It has the following advantages

Large laser irradiance, small heating range and small heat input result in small welding deformation and welding residual stress and high precision of weldment;

High heating and cooling speed, narrow heat affected zone and good mechanical properties of joint;

It can weld high melting point materials, such as Zr, W, Mo, cemented carbide, ceramics, etc;

Large depth width ratio, fast welding speed and high production efficiency;

It can be used for remote or inaccessible welding.

But for laser welding with high energy input and high power density, it is easy to produce various welding defects in the welding process, and the causes of thick plate defects are much more complex than thin plate welding.

In the process of thick plate welding with high power fiber laser, the small hole is very unstable, which is easy to produce welding defects such as spatter, surface collapse and bottom hump. It not only affects the appearance of weld, but also affects the mechanical properties of weld, which limits the application of high power laser in thick plate welding to a great extent.