I have some problems finding information and knowledge about spot and projection welding in UHS stainless steels, especially in thin sheets. The information i would be pleased to get is welding equipment requirements and manufacturers of such equipment.

The steels in question are metastable and has a more or less high content of deformation marteniste which are retransformed back to austenite when heated and therefore softens. How do a optimize my parameters to minimise the HAZ but still get a proper weld? Current intensity or welding time, AC or DC, pulses or electrode pressure? What type of electrodes? Wolfram perhaps?

Does anybody knows anything about this problem? I would be very pleased if you could help me out.

Mats