WELDER Qualification Thickness Limit

[tekari123]

Dear all

suppose a welder is qualified with base metal thickness 8.18 mm..what would be minimum thickness of base metal he can weld as per ASME section IX.?

Regards,

 

[stanweld]

There is no minimum other than the minimum thickness of the qualified welding procedure specification.

 

[stanweld]

Having said that, you may be a fool not to qualify the welder to make groove welds in very thin materials (production welder qualification), even when you have a WPS so qualified.

 

[birken]

Base metal thickness is not an essential welder performance variable except for OFW (oxyfuel gas welding). However weld deposit thickness is one. If he is qualified to deposit 8.18 mm of weld thickness then he can deposit weld of any thickness up to 16.36 mm.

Note that base metal thickness is an essential variable for welding procedure qualification. If the procedure qualified on 8.18 mm coupon then the approval range is from 1.5 mm to 16.36 mm.

Birken

 

[bpv66]

If using GMAW-Short circuit mode the welder would only be qualified to deposit 8.998 mm per QW-404.32.