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?
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Welder Qualification Records
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Welder Qualification RecordsWelder 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?
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RE: Welder Qualification Records
What is you design code? What exact CS grade (P and group#) have they qualified?
RE: Welder Qualification Records
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
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
Thank you.
RE: Welder Qualification Records
RE: Welder Qualification Records
RE: Welder Qualification Records
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
RE: Welder Qualification Records
ER70S-3 is F6/A1
ER90S-B9 is F6/A5
RE: Welder Qualification Records
RE: Welder Qualification Records
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
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
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
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
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