Advanced stud welding

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Stainless steel mirror panels and stainless steel brushed panels have very high requirements for welding marks. Generally, users require that no marks can be seen on the back side after welding from any angle, which is quite difficult to achieve.
During stud welding, a powerful current in an instant melts the metal at the tip of the stud. Although the tip is very small, it can generate a high temperature of several thousand degrees Celsius in an instant. This high – temperature in an instant is quickly transferred to the metal plate and then the plate cools down. The whole process lasts less than 1 second.
However, even in such a short time, the thermal expansion and contraction effect will occur, and the plate will undergo very slight thermal and cold deformation. Such micro – deformation is difficult to cover on mirror panels and brushed panels and can be found by careful inspection under light.
Solutions:

Increase the thickness of the plate: Through experiments, we found that welding M3 – M4 stainless steel studs on a 4 – mm – thick mirror panel can basically avoid deformation. It is difficult to ensure no micro – deformation for plates thinner than 4 mm (of course, different manufacturers have different acceptance levels for micro – deformation. Here, “no deformation” means that no deformation can be seen from any angle).

Re – grind and polish the plate after welding.