Iam welding sch 10 ss with the plasma process, and getting some porosity spots on the start and stop wich will not pass an x-ray. Does anyone have any ideas
What is the type of mixed gas for shielding are you using? If it's Argon/ O2 or Co2 then you will have a problem. If it's a Ar/ Helium your good to go. It's most cost effective to make the sheild gas and your plasma gas argon. We have the same type of set up on a robot and use it for all types of tubular joints, with and without filler. Sometimes for speed reasons we use hot wire and a 85/15 Ar He mix and it gives us about 10% faster speeds.