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Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

(OP)
QW-403.12
...When the melt-in technique is used for joining P-No. 1,
P-No. 3, P-No. 4, and P-No. 5A, a procedure qualification
test with one P-Number metal shall also qualify for that
P-Number metal welded to each of the lower P-Number
metals, but not vice versa.

_____________________________________________________________________
How useful is this clause anyway, given the different filler metals one might prefer for different combinations, as well as non-PWHT thickness limits in the various construction codes? It seems to me that the logical filler alloy choice to cover the entire range would be E9018-B3, but I have no experience with this rule.

I am considering such a qualification that will cover P-5A to lower P-Number alloys, in the non-PWHT condition, which would limit base metal thickness to the exemption limit of around 5/8". What are people's experiences with exploiting this rule, and what filler metal is recommended? And is it actually worth the trouble?

(Is 'melt-in technique' just another way to say arc welding?)

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

Appears to be only applicable to Plasma Welding or Laser Beam Welding

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

(OP)
DekDee,
I am aware of companies apparently doing this with conventional processes.

The definition given in the ASME IX glossary is not entirely clear:
melt-in: a technique of welding in which the intensity of
a concentrated heat source is so adjusted that a weld pass-can
be produced from filler metal added to the leading
edge of the molten weld metal.


This does not sound exactly like arc welding, where the filler metal is usually the electrode.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

It has been used by many manufacturers and contractors for decades because it saves the number of PQRs and has been used with conventional welding processes. It is especially useful for welding P5A to P5A and P5A to P4 and there are some clients who require the use of the higher alloy filler metal for welding P5A to all lower alloy materials or P4 to all lower alloy materials. All other essential variables of course need to be the same for each combination.

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

Conventional processes do not follow QW-403.12 for P5A - P5A,P4,P3,P1. A PQR done on P5A to P5A automatically qualifies P5A to P5A, P4, P3,P1..per QW-424.

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

(OP)

Quote (david339933)

Conventional processes do not follow QW-403.12 for P5A - P5A,P4,P3,P1.

Yes, I see QW-403.12 referenced in QW-250 WELDING VARIABLES tables only for plasma arc welding (PAW). So it appears this rule is not available to conventional welding processes. Sorry I didn't think to look in QW-250.

I should ask my regulator (TSSA) what they will accept.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

The rule is the same in QW-424.
P5A to P5A qualifies P5A to P5A, P4,P3,P1
P4 to P4 Qualifies P4 to P4, P3, P1
P3 to P3 Qualifies P3 to P3, P1

RE: Qualification of P-No. 1, 3, 4, and 5A – QW-403.12

IM,
Apologies for my previous post.
I did a word search on "melt-in" and it didn't come up with what you posted - only two examples referring to Laser Beam welding.
Then I looked through QW-250 and only found QW 403.12 applicable to Plasma.
Hence my reply,
Cheers,
Shane

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