441 SS ~1mm wall tube - welding query 2

[toohotforme]

Hi, does anyone have first-hand experience welding 441 thin wall tube - 46mm OD ~1mm wall thickness.

What welding technique is best suited, is filler rod used? If so what?
Is argon purging - pressurising the internals of the pipes - required?

This material is used in the auto industry for exhausts - am using it for heat exchanger - low pressure - water / exhaust gas.
Thanks for any advice.

 

[metengr]

Here is some background information to review regarding 441 stainless steel;

http://www.alleghenyludlum.com/ludlum/Documents/441.pdf

At 1mm thickness, I would use an inert metal arc gas welding process with no filler metal (autogenous). The Technical sheet from Allegheny provides information on welding.

 

[toohotforme]

Thanks metengr,
That seems to be good advice. I spoke to the steel mill that makes this material and they offer the same advice.