Re: [MW:13421] Welding of ss 321 with E 310 electrodes

Hi   SS 321 has to be welded with E347 electrodes only. The reason is as follows:     The nominal composition (wt. %) of SS347 weld metal is 19.5 Cr, 10 Ni with Nb or Nb plus Ta. added as a stabilizer. Either of these additions reduces the possibility of intergranular chromium carbide precipitation and thus increases resistance to intergranular corrosion.   Although niobium is the stabilizing element usually specified in Type 347 alloys, it should be recognized that tantalum also is present. Tantalum and niobium are almost equally effective in stabilizing carbon and in providing high-temperature strength. This specification recognizes the usual commercial practice of reporting niobium as the sum of niobium plus tantalum. If dilution by the base metal produces a low-ferrite or fully austenitic weld metal deposit, crack sensitivity of the weld may increase substantially. Also note that E310 may result in a fully austenitic weld and may result in hot cracks.   Regards   Prem Nautiyal --- On Wed, 1/4/12, N VENKATESWARA PRASAD <weldengr.velosi@gmail.com> wrote: From: N VENKATESWARA PRASAD <weldengr.velosi@gmail.com> Subject: [MW:13408] Welding of ss 321 with E 310 electrodes To: "materials-welding" <materials-welding@googlegroups.com> Date: Wednesday, January 4, 2012, 3:30 PM Dear All, We  need to Weld repair the flare cone. Intially it was thought it is SS 310, but after PMI it was found that it is 321.  It was understood that  SS 321 was welded with E 310.  Is it accepble to weld SS 321 with E 310 electrode.  What are the pro and cons. SS 321 and 310 are meant for high temp. applications.  Please eloborate the differences between them on application point of view. Regards Venkat -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.