Welder Qualification

[QCMike]

Does any ASME piping code specify that the first two welds by any welder

need to be radiographed as qualifying shots?

If so, would that be per welder, per procedure?

Thanks QCMIKE

 

[metengr]

What piping code are you working to specifically?

 

[QCMike]

The welding is being done to B31.3.

QCMIKE

 

[SJones]

No! B31.3 will not specify the scenario about which you are enquiring. The intent of B31.3 is that welds are made by qualified welders. The only way that qualification can be undertaken in production is with the approval of the owner and then the specifics will require agreement.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdoweb/

 

[QCMike]

Which weld has more strength, a fillet weld around a socket connection or a butt weld?

A natural gas line was butt welded when the customer spec called for socket welds.

At a meeting it was mentioned that a butt weld was stronger than a socket weld and this was immediately contradicted by one of the attendees.

Which would it be?

Thanks,

QCMIKE

 

[SJones]

For the same weld metal UTS and loading scenarios, compare the cross sectional areas of the two welds and see which is larger.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdoweb/

 

[QCMike]

I have a pipe spec. that quotes A333 ITCS pipe and ITCS A350 LF2 fittings.

Are these materials impact tested any differently than normal test for these materials?

QCMIKE

 

[pipewelder1999]

A socket weld may be more subject to failure in applications in which vibration or cyclic loading occur. As far as internal pressure go. Both can stand whatever the pipe can.

Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com