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Welder Qualification Records
2

Welder Qualification Records

Welder Qualification Records

(OP)
Our welders were tested on CS and qualified but they have welded the P91 headers. Is there a code violation on ASME IX?

RE: Welder Qualification Records

(Most probably) yes.
What is you design code? What exact CS grade (P and group#) have they qualified?

RE: Welder Qualification Records

(OP)
ASME Section 1 construction code for boilers and Welders qualified under ASME IX.

Welder is qualified on Carbon Steel SA105 OD 73mm x 13mm (GTAW)-P No.1.
Is the welder allowed to weld A335-P91 (15E group 1)?

RE: Welder Qualification Records

Im not familiar with Sect I, but based on sec IX; no.
Review QW-356. P-number is an essential variable.

Welding P91 when qualified on A105 is a HUGE difference. WHat filler has been used on P91? F-number is an essential under QW-356 too.
Also keep in mind that PWHT may be required by the code of construction (sec I). That also sets requirements to the qualified WPS.

RE: Welder Qualification Records


For strictly material grade issues, a welder qualified on P1 materials is qualified to weld P‐No. 1 through P‐No. 15F, P‐No. 34, and P‐No. 41 through P‐No. 49. See ASME Section IX QW 423.1.

RE: Welder Qualification Records

(OP)
Section IX QW-423.1 refers to welder qualification test alternative base metal but not on production weld. Correct me if I am wrong then SectionIX.

Thank you.

RE: Welder Qualification Records

(OP)
You are right. SectionIX. Disregard my previous comment "Section IX QW-423.1 refers to welder qualification test alternative base metal but not on production weld. Correct me if I am wrong then SectionIX.".

RE: Welder Qualification Records

You're right! SectionIX, totally forgot about that. I think the question should be if the welder would be able to make a sound weld, if he's qualified on A105.

RE: Welder Qualification Records

Pipoy04,

We are on the same page.

My rationale is based upon variable QW-403.18 [in QW-351] which states "A change from one P‐Number to any
other P‐Number or to a base metal not listed in Table QW/QB-422, except as permitted in QW-423, and in QW-420
".

QW 423 states "Base metal used for welder qualification may be substituted for the metal specified in the WPS in
accordance with the following table..."

RE: Welder Qualification Records

Am I correct that the F-number also doesn't change, assuming welding A105 with e.g. ER70S-3 and P91 with e.g. ER90S-B9?

RE: Welder Qualification Records

Can you please restate the question? Not sure what you are asking...

ER70S-3 is F6/A1
ER90S-B9 is F6/A5

RE: Welder Qualification Records

Section I defaults back to Section IX for WPS and Welder Performance qualification, period. You have base material and filler metal for performance qualification. The purpose of the welder performance qualification is to demonstrate the ability of a welder to produce a sound deposit. Based on the above, I see no nonconformance for the welder qualification provided the diameter and thickness ranges are correct.

RE: Welder Qualification Records

XL83NL
Bothe welding filler metals are in F No. 6. Different A-Nos but A-No is not an essential variable for welder performance qualification.

RE: Welder Qualification Records

Sorry guys, I was completely wrong on this one. I've forgotten that when welding P1 for a WPQ, one's allowed to weld more Pnumbers.

What I've never really understood is the freedom the code gives in this respect (or how this rule is actually used by some manufacturers in that they use one WPQ for a welder to weld more than just that specific material grade). Given the difficulties that come with P91 (at least, from what I've read about this grade and its applications over the years, not from actual experience), I find it hard to believe this is allowed by the code. But maybe that's just me.

RE: Welder Qualification Records

XL83NL;
No sweat. I am not a member of Section IX but I do know a fair number of members. Basically, what it boils down to is this, a welder follows a detailed procedure for production welding. When it comes to performance qualification, the welder need only demonstrate that they possess a minimum proficiency for depositing a sound and quality weld. When it comes to welding Grade 91, what really matters is that the welder follows exactly the requirements on the WPS and uses their demonstrated ability to deposit the specified weld metal in a quality manner.

RE: Welder Qualification Records

By the way, there are a number of Owners that require welders to qualify on P91 material with radiographic testing.
The employer can require welders to qualify on the materials to be joined if he so chooses. As metengr stated, ASME IX provides some assurance of a welder's "minimum proficiency" which may not be enough to assure sound welds in specific materials.

RE: Welder Qualification Records

"When it comes to welding Grade 91, what really matters is that the welder follows exactly the requirements on the WPS. . "

Exactly; the problems on P91 come in when the preheat, interpass, or PWHT requirements are 'fudged' or totally disregarded by the welders. And these requirements are NOT easy to maintain without having a Heat-Treatment company provide them, vs. giving the welder a oxy-acetylene torch and temperature crayon.

RE: Welder Qualification Records

Thanks for the great insights gents, that cleared some misunderstandings for me.

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