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

By Materials & Welding
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

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