I am getting confusion in welder q 1

[stan000]

I am getting confusion in welder qualification certificate
PROCESS- GMAW
WELDING BASE METAL- P1 TO P1 - Range Qualified - P1 thru P11, P34,P4X
TEST COUPON = 0.375 "
WELDER IS QUALIFIED - 1/16" TO 0.750" AS PER QW 451.1
My understanding
welder is qualified only on GMAW Process & He Qualified joining P1 TO P11 GROUP BUT NOT P8 TO P8.
please clarify.
regards

 

[david339933]

Why do you think the welder would not be qualified?

 

[stan000]

thanks for reply
my understanding
joining base metal is P1 TO P1 - QUALIFIED RANGE P1 TO ANY GROUP BETWEEN ( P1 TO P8) P4X, P34.
QW-423.1- When a base metal shown in the left column is used for welder qualification, the welder is qualified to weld all combinations of base
metals are shown in the right column.

P-No. 1 through P-No.15F-- Qualified Production Base Metals P-No. 1 through P-No.15F, so he can weld any combination.

& WELDING OF CARBON STEEL IS EASY THAN WELDING STAINLESS.
While waiting for the carbon steel to reach weld temperature, the stainless can overheat and become riddled with hot cracks.

Regards

 

[CWEng]

That is why you have a WPS that has a maximum interpass temperature limit. Not overheating the weld/base metal is not testing the skill of the welder other than to follow instructions. Per ASME Section IX, the welder would be qualified for P8 since it is between 1 and 15F. The F-number of the electrode may be another matter depending on what process you are using.

 

[stan000]

Thanks for reply
so you are saying
p1 to p1 - welder qualified p8 to p8. P3 TO P3, P5 TO P5 ETC.

 

[CWEng]

Yes, and P1 to P8 and P3 to P5, etc. Welder skill is more related to the filler metal than the base metal.

 

[stan000]

Thanks
i was getting confusion the wording weld all combinations of base
Thanks