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Welding procedures?

Welding procedures?

Welding procedures?

(OP)
Is it ok to repair a 10"  S40 CS A53-B pipe that was welded with 7018, with 70S Tig on the Cap? I was not given a Procedure for this Inspection, and was told that it was ok. I would like to know for sound of mind......

RE: Welding procedures?

It is technically acceptable to do but do you have the welding procedure specification for doing this repair sequence?

RE: Welding procedures?

Any GTAW weld procedure, if it has adequate "big-T" qualified base metal thickness will work for this repair.  Main Inspx points are FULL excavation of the defect, and a wide enough groove angle to be weldable.  Angle should be on the GTAW WPS being used.

RE: Welding procedures?

I would have thought that unless you have a qualified repair procedure using TIG as a substitute for SMAW you cannot do this. Change of process is an essential variable in any spec.

RE: Welding procedures?

Almost any GTAW procedure will work.  Just have to watch 'big'T versus 'little' t as set in your GTAW WPS.

'Big'T is the total thickness of the basemetal being welded on.  Does the proposed WPS have a thick enough upper limit to allow work on your thickness?

'Little' t is the total deposited weldmetal.  Do not use this when evaluating whether your WPS will work for the repair.  And again, ensure that the angle & width of the excavation is wide enough to fulfil the requirements of your WPS.  Welders tend to leave the groove too narrow to meet the limits of a WPS.

RE: Welding procedures?

This kind of question is why I dislike combining GTAW & SMAW on PQRs ...  

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