Dissimilar welds betten SS and Ti are made by non-fusion processe like explosive welding, diffusion bonding, friction welding etc.. What is the bend ductility requirements for such joints as per ASME requirements? These joints are not expected to show 180 degree bend ductility.

Thanks and regards

Shaju

Dear Saju Sir,

As per ASME Section IX, qw 466.1, it is very clearly stated that the bending requirements shall be based upon the % of elongation of the abse material to be welded.In your case as it is dissimilar base metal combination ( P 51 & P8), the base material of lesser  % of elongation as per relevant base material specification shall be considered in finalising the mandrel diameter.In this case CP Titanium with 24 % and SS 304L with 40 % minimum elongation shall be considered fro comparison.

By considering the weakest on ie, CP titnaium, Mandrel diameter comes to  "3 inch" for 10mm thickness and "8t" for less than 10 mm thickness aginst the usual requirement of "4t".

I hope that Titanium can withstand the forming diameter of double times as that of  required for stainless steel because of higher radius of curvature and lower bending stresses.

Kuppusamy M V
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