Welding 321 S/S Autogenous
Welding 321 S/S Autogenous
(OP)
I am having difficulty welding 321 S/S tube without any filler. I am consistantly being told it is due to a new low sulfur content. Also, that the Ti is bonding with another alloy which then becomes a lower eutectic point. The type of defect is porosity along the centerline of the weld. I believe it is due to cleanliness, and weld prep. Any advice would be appreciated!!
Thanks
Thanks





RE: Welding 321 S/S Autogenous
RE: Welding 321 S/S Autogenous
thanks
RE: Welding 321 S/S Autogenous
Another objection is that by foregoing the use of filler metal one eliminates the possibility to introduce ferrite forming elements in the weld to prevent hot cracking.
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RE: Welding 321 S/S Autogenous
In your case, the cause of porosity in the seam weld is related to either a shielding gas problem or clealiness.
RE: Welding 321 S/S Autogenous
In line with metengr's comments when we first started autogenous welding (safe ending) of Hx tubes we actually used electropolishing techniques for cleaning in order to get a good weld.
How is the shape of the weld?
Is there any possible lubricant from the forming dies getting to the weld area.?
RE: Welding 321 S/S Autogenous