The recomendation would be
GTAW 5.28 ER 80s Ni3
SMAW 5.5 E7018 C2L/E 8018 C2/C2L
Since A 765 Gr III is usually used for service around -75 degc and materail can be desinged up toservice -100 degc, the design minimum temperature limiting would be based on A516 GR 70 or lowest service design temperature which is probably -45 deg c or higher.
so the weld procdure can be used above filler metals and consideration shall be given on limiting the interpass temperature to 500- 500 deg f max while developing weld procedure .
or alternatively the carbon steel filler ( ER70 S2/S6/S7) and electrode E 7018-1 can be used if the lowest design temperature is more than -45 deg c and less than -29 deg c
On Fri, Feb 20, 2009 at 6:41 PM, Sukamal Naskar <sukamalbecmet@gmail.com> wrote:
Dear Friends,Good morning. This mail is regarding a technical query of welding with SA-765 Gr.-III (P No. 9B) to SA-516 Gr.70 ( P No.1) material. I would like to know the suitable welding consumables ( AWS Classification) of both GTAW and SMAW process along with the technical know how. Any special precautions need to be taken before, during or after welding .expecting your valuable comments.Thanking you,Regards,--
Sukamal Naskar
Malaysia
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