A 3G Coupon Assigned to a 1 in Overhead Groove
A welder's qualification record on file shows a 3/8 in A36 plate groove test, 3G, vertical up, SMAW with E7018 (F4), bend tested and passed, dated 14 months ago. Production now requires a complete-joint-penetration groove weld in 1 in A572 Gr. 50 plate in the 4G position, with an E6010 root and E7018 fill and cap. The welder has been running fillet welds in the shop nearly every day but has not made a groove weld in about nine months. The superintendent says: "He is qualified in 3G, and 4G is basically flat with a different plate. Just let him weld it."
1. Is this welder qualified for the production joint? Work through each qualification variable separately rather than giving a yes/no.
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Go variable by variable.
Thickness. A groove test on a 3/8 in coupon qualifies roughly 1/16 in up to twice the coupon thickness, i.e. about 3/4 in. The production base metal is 1 in. That is outside the qualified range - fail.
Position. A 3G test qualifies flat, horizontal, and vertical welding. Overhead is not covered by 3G; 4G testing is what establishes overhead capability. Production is 4G - fail.
Filler/F-number. Qualification with an F4 (low-hydrogen, E7018-type) electrode extends coverage to the lower F-number groups, so an F3 cellulosic root such as E6010 is within the filler grouping. This variable alone would not disqualify him.
Base metal. For welder performance qualification, base metal grade is not the governing variable here; A36 to A572 Gr. 50 is not the problem.
Two independent failures (thickness and position) mean he is not qualified. The superintendent's reasoning conflates procedure qualification logic with performance qualification logic, and the "different plate" argument is aimed at the wrong variable entirely.
2. What records must the inspector actually pull and check, and does the nine-month gap in groove welding by itself void the qualification?
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Records to pull: the WPS being used; the PQR supporting it; the welder's performance qualification record showing name and identifier, process, F-number/electrode, position, test coupon thickness and type, test method and results, date, and who witnessed or certified it; and the continuity log showing when the welder last used each process.
On the nine-month gap: D1.1's validity provision keys to whether the welder has been actively using the process, not to whether he has made that particular joint type recently. If he has been running SMAW regularly, continuity for the process is maintained, and the groove-versus-fillet distinction alone does not void the qualification. The real risk is the separate provision that qualification can be questioned for a specific reason - for example, a run of rejectable welds or a change to conditions he was never tested under.
Either way, the answer to the production assignment is the same: he must be requalified on a coupon thick enough (1/2 in or greater, since 2t must reach 1 in) and in the 4G position before he welds this joint. The inspector should hold the assignment and document the basis, rather than relying on the superintendent's verbal assurance.
3. The fabricator offers to have the welder run a fillet weld test in the 4G position instead, arguing it is faster. Assess that offer.
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A fillet weld performance test and a groove weld performance test are not interchangeable when the production joint is a CJP groove weld. Groove welding tests root fusion, penetration, and the ability to control a joint that is being fully fused through the thickness; a fillet test exercises a different skill set and a different set of essential variables.
Even if a 4G fillet test would satisfy the position variable, it does not satisfy the joint-type and thickness variables. And the thickness question is not solved by a fillet coupon at all: 1 in production base metal with a groove weld requires a groove coupon of sufficient thickness (at least 1/2 in under the 2t rule) unless the fabricator can show an existing qualification that already covers 1 in.
The efficient answer is not a shortcut - it is a single 4G groove test on a coupon of adequate thickness with the F-number the production welding uses, which then covers this joint and any thinner work in flat, horizontal, vertical, and overhead. The inspector should say so plainly and record the rationale, because the shortcut will resurface on the next shift.