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We are welding castings made of FSX-414 . Cobalt based alloy. We have a lot of shrink in the castings and are salvaging them for production. We have to rout thru-holes in them(about .250 wall thickness) and are back purging. The problem is (problems are) we are getting either cracking where the...

Is it possible to weld cast steel coupling to steel tubing(1.500 x .375 wall,low carbon steel)without preheating the cast steel. Is there a cast steel material that doesn't require preheating. What welding process is best for cast steel.

I'm welding with Plasma Transferred Arc technology, and we are trying to weld MINOX.This is a kind of alleation with this composition : Cu,Ni,Al,Zn. We preheat the pieces (pieces are about 3 kg) about 400ºC (752Farenheit), and we are finding porosities.... Why ? I weld about 130Ampers of...