The weld metal has good corrosion resistance and the mechanical character and crack resistance are fine.
The main things that separate the men from the boys or should I say, the actual welders from the rod burners are the enthusiasm to follow procedures for welding stainless steel. Procedures like waiting for the pipe to cool in between passes, maintenance the hot tip of the rod shielded with argon, snipping the tip of the tig welding rod when it gets crapped up, maintaining your tungsten sharp.
One of the main actions is PURGE. Stainless steel completely has to be purged with argon gas in order to prevent sugaring. Sugaring is also called granulation but it is severe oxidation no substance what you call it.
You can’t still get away with tack welding without an argon purge that protect the back side or inside of the pipe. So how do you do it? How do you defend the back side with argon?
Regularly it is done with aluminum duct tape. The ends of a stainless steel pipe are taped shut and the complete inside is purged with argon gas. Yet the opening in the pipe joint itself is taped so that argon can fill the whole pipe and push out any oxygen. The strip is peeled back just enough to obtain a tack once the pipe is purge enough.
More information: welding electrode
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