Tube to Tube Sheet Mock up (Performance Qualification) QW-193.2

Question

Tube to Tube Sheet Mock up (Performance Qualification) QW-193.2

(OP)

21 Feb 23 07:24

Back Ground:

A welder welded 10 tubes in which one tube rejected in visual test and two in macro examination but other 7 tubes accepted in visual, PT and macro examination.

Question:

Is welder qualified as per QW-193.2 " a minimum 05 tubes are required for qualification".

Reference attached.

Regards,
Fahad

https://files.engineering.com/getfile.aspx?folder=53db2d90-1719-45a1-a739-4

DekDee (Petroleum) · Answer 1 · 2023-02-21 09:09:44

Why did the welder weld 10 tubes instead of the required 5 tubes ?
You have 5 x acceptable so theoretically the welder has passed.
However, the code provides minimum requirements - it is up to you as the representative of the employer to decide on acceptability of the welder.
3 x DNC from 10 x welds - a 30% failure rate. Not acceptable.
This is only my opinion but if I was in your position I would have the welder weld a further 5 x tubes and all 5 must pass.

weldstan (Materials) · Answer 2 · 2023-02-21 13:50:33

Agree with DekDee. Make sure that the welder sees the welds that did not pass and explain to him/her why the welds did not pass.

r6155 (Mechanical) · Answer 3 · 2023-02-21 17:32:41

I suggest further training or practice and then new test.

Regards

MUHAMMAD FAHAD RANA (Materials) · Answer 4 · 2023-03-15 10:53:25

RE: Tube to Tube Sheet Mock up (Performance Qualification) QW-193.2

MUHAMMAD FAHAD RANA (Materials)

(OP)

15 Mar 23 10:53

Dear All,

Thanks for your comments,

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Tube to Tube Sheet Mock up (Performance Qualification) QW-193.2