Section IX - welder qualifications MIN allowable to wall thickness

[Eireann]

I have been reviewing some welder qualifications for a small bore 2" piping job sch 80 , the wall thickness is .218 .. The welder "tickets" shows qualification of .250 - max from 1" OD and up . My question is does he qualify to weld on this material as it is thinner than the material he qualified on ? I have heard conflicting reports that there is no minimum deposit thickness qualifications . I am struggleing to find a clear answer in ASME IX. any help or clarity would be appreciated.

 

[metengr]

There is no minimum thickness for welder performance qualification, as described in QW-452. In other words the welder is qualified to weld up to the thickness qualified.

 

[blaqesmith]

ASME IX does not tell about minimum qualified thickness for welder/ welding operator as Welder is qualified upto .25 so he can weld .218 thickness. besides this you can not overlook diameter restrictions of ASME IX for welder/ welding operators so check qualified Diameter ranges and compare it with job

 

[weldstan]

Qualification on the 0.218" wall pipe permits the welder to weld all thicknesses up to 0.436" wall, assuming the welding process was not the short-circuiting transfer mode of the GMAW process, in which case, he would be qualified to 1.1 x 0.218".