addition or deletions of backing

[qc4jc1]

If a welder qualifies to AWS with backing, is he qualified to weld without backing? The welder who is not qualified to weld (CJP) without backing, the grove side, then flipped it over and backgouged and then welded the other side. Is this allowed?

 

[DekDee]

Yes

 

[qc4jc1]

Could someone please direct me to where in AWS is this information found. Tribal knowledge is great but in the Nuclear sector this information must needs to be proven. What Section and paragraph of AWS D1.1 or AWS D1.6????

 

[qc4jc1]

4.22 Essential Variables
Changes beyond the limitation of essential variables
for welders, welding operators, or tack welders shown in
Table 4.10 shall require requalification.

4.23 CJP Groove Welds for
Nontubular Connections
See Table 4.8 for the position requirements for welder
or welding operator qualification on nontubular connections.
Note that qualification on joints with backing qualifies
for welding production joints that are backgouged
and welded from the second side.

Table 4.10
Essential Variable Changes to WPQR Requiring Requalification Welders (Note 6 and 7) Tack Welders
(1) To a process not qualified (GMAW-S is considered a separate process) X X X
(2) To an SMAW electrode with an F-number (see Table 4.11) higher than the X X
WPQR electrode F-number
(3) To an electrode and shielding medium combination not approved by an AWS X X X
AS document
(4) To a position not qualified X X X
(Note 3)
(5) To a diameter or thickness not qualified X X
(Note 4) (Note 4)
(6) To a vertical welding progression not qualified (uphill or downhill) X
(7) The omission of backing (if used in the WPQR test) X X
(8) To multiple electrodes (if a single electrode was used in the WPQR test) but X
not vice versa (Note 5)

 

[DekDee]

qc4jc1,
If you are in the nuclear industry (which is a critical industry) you should either know the answers to your questions or be able to find the relevant criteria in the relevant codes !
Having to search via an internet forum does not instil a great degree of confidence,
Regards,
DD

 

[holdpt]

If you performed the weld with a backing weld, then the face (grooved side) obviously had backing. If you performed the weld with a back weld, then the face side provided the backing. For AWS D1.1, a CJP weld without backing is a single sided CJP weld.

 

[qc4jc1]

I understand that if the welder is welding to a back gouge or backing bar he is qualified, but this welder is making a CJP weld by tacking up, rooting out and capping. Then he comes back after the weld has been back gouged and welds the other side. So the welder is making the complete weld. Is he qualified to preform all these actions?
Thanks

 

[holdpt]

Yes. If I understand you correctly, that is the 2nd scenario that I mentioned.

 

[qc4jc1]

Thank You