Welding of A312 Gr.TP321H

[ARUN KUMAR]

Dear All,
 
I need your valuable advice on following.
 
I need to carry out the welding of A312 Gr. TP321 H ( GTAW process) with a WPS qualified for P8- P8 material. In the WPS it is mentioned that to use ER 347 H for welding A312 Gr.TP321 H.
 
In ASME, section II, there is no F no classification for ER 347 H ( other filler ER308 H & ER316 H are classified in 5.9)
 
The filler wire is supplied by ESAB and theire Material cert is showing only ER 347 ( SFA 5.9) with carbon % .04 ( As per section II ,Carbon % for ER 347 is max .08%)
 
Since there is difference in C %, do I need to requalify the WPS using  the above filler ( ER 347 with C % .04)?
 
Thanks and regards,
 
Arun

[Vanchinath S.A.]

no need to requalify

vanchi

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[govindasamy neethipathi]

Dear Arun kumar,

 

ER 347 can be used to weld SS321H and re qualification is not required if already qualified for P8.

 

 Chemical Composition
Represented by ASTM A240 and ASME SA-240 specifications.

Element	Weight Percentage Maximum Unless Range is Specified
	321	347
Carbon*	0.08	0.08
Manganese	2.00	2.00
Phosphorus	0.045	0.045
Sulfur	0.030	0.03
Silicon	0.75	0.75
Chromium	17.00-19.00	17.00-19.00
Nickel	9.00-12.00	9.00-13.00
Columbium + Tantalum**	--	10xC min to 1.00 max
Tantalum	--	--
Titanium**	5x(C+N) min to 0.70 max	--
Cobalt	--	--
Nitrogen	0.10	--
Iron	Balance	Balance
	*Also H grade with Carbon 0.04 – 0.10%. **H grade minimum stabilizer is different formula.

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[kannayeram gnanapandithan]

while welding there is a change for loss of titanium, that is why they generaly recommend for Niobium/Columbium based welding consumables

kgp