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Participant

Join Date: Sep 2014
Posts: 3

Welding Qualification Range

09/22/2014 5:16 AM

Dear Sir,

Please clarify the following doubts

1. ASME SEC IX-QW 451.2(b)-it says that if the weldmetal thickness is > 13 mm the welder can weld unlimited thickness(pipe&plate) below 13mm coupen thockness x 2.

this one for combination or for only one process???

2. what is the maximum thickness that which GTAW is allowed,if GTAW is not allowed for all thickness what its reason?

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Power-User

Join Date: May 2007
Posts: 104
Good Answers: 3
#1

Re: Welding Qualification Range

09/23/2014 4:48 AM

1. If the process followed for welding is a root run by GTAW and subsequent runs by SMAW, then the max. thk. applicable to this combined process would be 2T where T is the thk. of the test piece. But if the process followed is fully GTAW or SMAW for 13 mm thk. the welder is approved for GTAW or SMAW only for max. 26 mm thk. respectively.

2. There is no specified max. thk. applicable for GTAW. GTAW is a costlier process and deposit rates are lower than SMAW, so it is not preferred for higher thicknesses. This process is used for root runs of higher thk. weld joints to obtain smooth root penetration or else used for full welding of low thk. weld joints specifically for smaller diameters where leakages are possible due to overheating and burn throughs etc. if SMAW is used. Also it is preferred for welding stainless steels where thk. is lower even in higher diameters because Stainless Steel which is costlier is usually meant for corrosion resistance and not for high pressure although there are always exceptions.

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Participant

Join Date: Sep 2014
Posts: 3
#2

Re: Welding Qualification Range

09/23/2014 9:56 AM

SIR,I AGREE WITH THE ALL THICKNESS CAN BE WELD BY GTAW,BUT FOR THE FIRST QUESTION YOU SAYING THE RANGE IS 2T.THEN WHY ASME TELLING UNLIMITED THICKNESS.ABOVE 13MM 2T OR UNLIMITED,ITS VERY CONFUSING

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Commentator

Join Date: Nov 2012
Posts: 94
Good Answers: 5
#3

Re: Welding Qualification Range

09/24/2014 7:43 AM

Welder has to put Min. 3 layers, and above 13mm Thk. weld metal to get Max. to be welded qualification status.

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