Addition and deletion of backing in ASME IX

[engr2GW]

Hi all,
In ASME IX QW 253, deletion of a backing in a weld joint design is considered Non-essential, does that mean that
1. If the procedure is qualified with a backing, you can weld without backing
2. If the procedure is qualified without backing, you can weld with a backing
3. The main question is, I have a procedure qualified without a backing, and there's a need to weld with a sleeve to protect internal coating, does that require re-qualification or the sleeve can be used based on this part of the code;

Thanks a lot.

 

[metengr]

No, the WPS can be used for backing application. For example, depositing a fillet weld or partial penetration weld.

 

[stanweld]

1. Yes, provided the welder is qualified without backing.
2. Yes.
3. No, per metengr

 

[DVWE]

1. Yes, but the welder or welding operator has to be qualified to weld without backing.

2. Yes.

3. Probably doesn't require requalification, but a little more info will help. What kind of weld does the sleeve require?

 

[engr2GW]

Thanks everyone for your inputs.

@DVWE the weld is butt stick welding, and the backing is a tuboscope sleeve that's used to protect internal coating.

 

[DVWE]

You should be OK then.