Welder Qualification Test — ASME IX & D1.1 Guide
A Soldador qualification test proves a welder can produce acceptable welds using a specific process, position, and material type. Both ASME IX and D1.1 require Qualificação de desempenho Ensaio but differ in how they define qualification ranges, Critérios de aceitação, and position equivalencies.
What the Test Involves
A welder qualification test follows a specific procedure: the welder produces a Corpo de prova (a welded joint on plate or pipe) under controlled conditions that match a qualified welding procedure Especificação (WPS). The test coupon is then evaluated through one or more examination methods — Inspeção Visual, guided bend tests, Radiográfico examination, or macro examination — depending on the governing Código and joint type.
The test is not an exam on Soldagem theory. It is a hands-on demonstration that the welder can physically produce welds that meet the code’s Aceitação criteria. A welder who produces a test coupon with unacceptable defects — Trincas, Fusão incompleta, excessive Porosidade, failed bend tests — fails the qualification regardless of experience or certifications held.
D1.1 Welder Qualification (Clause 6)
Under D1.1:2025, welder qualification is governed by Clause 6 Part C. The welder produces test coupons using a WPS that is either Pré-qualificado per Clause 5 or qualified per Clause 6. Test coupons are evaluated based on the joint type:
Groove welds on plate: Visual Inspeção plus either guided bend tests (face and root bends per Clause 6.23 with acceptance criteria per Clause 6.10.3.3) or radiographic examination of the test plate. The Ensaio de Dobramento specimens must withstand bending to 180 degrees without cracks exceeding 1/8 inch in any dimension.
Groove welds on pipe: Visual inspection plus guided bend tests or radiographic examination. For pipe qualified in the 6G position (pipe inclined at 45 degrees), both face and root bend specimens are taken from specific locations around the pipe circumference per Figure 6.22.
Fillet welds: Visual inspection plus macro examination of the Solda de Filete cross-section. The macro must show complete fusion to the root and no cracks. Fillet Soldagem qualification is separate from Solda de chanfro qualification — a welder qualified for groove welds is also qualified for fillet welds per Table 6.11, but the reverse is not true.
Position Qualification Ranges (Table 6.11)
D1.1 Table 6.11 is the key reference for understanding which positions a welder is qualified for based on the test position. The table works on the principle that qualifying in a more difficult position qualifies for less difficult positions:
| Test Position | Groove Welds Qualified | Fillet Welds Qualified |
|---|---|---|
| 1G (flat plate) | 1G only | 1F only |
| 2G (horizontal plate) | 1G, 2G | 1F, 2F |
| 3G (vertical plate) | 1G, 2G, 3G | 1F, 2F, 3F |
| 4G (overhead plate) | 1G, 4G | 1F, 2F, 4F |
| 3G + 4G (both) | All positions (1G, 2G, 3G, 4G) | All positions (1F, 2F, 3F, 4F) |
Simplified from D1.1:2025 Table 6.11 (plate positions). For pipe positions including 6G, see Table 10.8.
ASME IX Welder Qualification (QW-300)
Under ASME IX, welder qualification is governed by QW-300 through QW-322. The welder produces a test coupon using a qualified WPS (backed by a PQR). Test coupons are evaluated by guided bend tests per QW-302 or radiographic examination per QW-302.2.
Position qualification follows QW-461.9, which defines similar position-to-position qualification ranges as D1.1 Table 6.11. Qualifying in the 6G position qualifies for all positions under ASME IX as well.
Material qualification is based on P-Number assignments. A welder qualified on a P-Number 1 material (Aço carbono) is qualified for all P-Number 1 materials regardless of the specific grade. QW-423 defines the P-Number qualification ranges — qualifying on certain P-Numbers qualifies for others within defined groupings.
Process qualification is process-specific. A welder qualified for SMAW is not qualified for GMAW or GTAW — each process requires separate qualification. However, qualifying with one Metal de Adição F-Number within a process qualifies for other F-Numbers per QW-433.
Thickness qualification follows QW-452. The test coupon Espessura determines the qualified Faixa de espessura. For plate, a 3/8-inch test coupon qualifies for material from 1/16 inch through 2T (where T is the test coupon thickness). Pipe diameter also affects Faixa de qualificação per QW-452.3.
Common Reasons for Failing Qualification
Incomplete fusion. The most common failure — the Metal de Solda does not fuse completely to the Metal de Base or to the previous weld pass. This is particularly problematic in the Passe de raiz of open-root groove welds and in vertical-up welding where inadequate manipulation allows the arc to ride ahead of the puddle.
Excessive porosity. Gas pockets trapped in the weld metal. Common Causas include contaminated base metal (oil, rust, moisture), inadequate Gás de proteção coverage (wind, damaged nozzle, wrong flow rate), and welding over primer or galvanized coating without proper preparation.
Failed bend tests. The guided bend specimen cracks or opens during bending. Root causes include hydrogen embrittlement (from moisture in electrodes), high residual stress from poor technique, or slag inclusions that create stress concentrators at the bend.
Undercut exceeding Limites. Excessive melting of the base metal at the Margem da solda without adequate fill. The D1.1 Aceitação visual criteria in Table 8.1 limit undercut to 1/32 inch for cyclically carregado structures.
The 6-Month Continuity Rule
Both codes require the welder to use each qualified process at least once within every 6-month period. If a welder does not weld with SMAW for 6 consecutive months, the SMAW qualification lapses regardless of how much GMAW or FCAW the welder performed during that period.
D1.1 Clause 6.2.3.1 and ASME IX QW-322 are nearly identical in this requirement. The practical implication is that fabricators must track each welder’s process usage. A welder continuity log is the Norma tool for this — a running record of which processes each welder has used and when.
When a qualification lapses, the welder must requalify by producing a new test coupon and passing the applicable tests. There is no provision for reinstating a lapsed qualification through documentation alone — the welder must physically demonstrate the skill again.
Questions about qualification Requisitos?
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Ask FluxKey Takeaways
- 6G is the most efficient qualification test — one pipe test at 45 degrees qualifies for all groove and fillet weld positions under both D1.1 and ASME IX.
- Groove weld qualification includes fillet welds, but fillet weld qualification does not include groove welds. Always qualify on groove welds for Máximo range.
- The 6-month continuity rule applies per process — a welder must use each qualified process within every 6-month period or requalify.
- ASME IX and D1.1 qualifications are not interchangeable without documented review. Each code has independent requirements for positions, materials, and acceptance criteria.
"The qualification test proves the welder can make the weld. The WPS tells them how. The continuity log proves they haven’t stopped doing it."
D1.1:2025 Clause 6.2.3.1 requires documented evidence that each welder has used the qualified process within the preceding 6 months
Frequently Asked Questions
A welder qualification test is a performance test that demonstrates a welder can produce sound welds using a specific process, in a specific position, on a specific type of material. Under D1.1 Clause 6, the welder produces a test coupon that is evaluated by visual inspection, bend testing, radiography, or macro examination. Under ASME IX QW-300, the welder produces a test coupon that is destructively tested (guided bend tests or radiographic examination). Passing the test qualifies the welder within a defined range of positions, materials, and thicknesses — not just for the exact conditions tested.
D1.1:2025 Table 6.11 defines qualification ranges by test position. A welder who qualifies in the 3G position (vertical) is qualified for 1G (flat) and 2G (horizontal) groove welds. Qualifying in 4G (overhead) qualifies for 1G and 4G only (not 2G). Qualifying in both 3G and 4G qualifies for all groove weld positions. For fillet welds, qualifying in 3F (vertical fillet) qualifies for 1F and 2F. The most comprehensive single test is 6G (pipe at 45 degrees) which qualifies for all groove and fillet weld positions in both plate and pipe.
Under both D1.1 Clause 6.2.3.1 and ASME IX QW-322, a welder's qualification remains valid indefinitely as long as the welder uses the qualified process at least once within every 6-month period. If 6 months pass without welding with that specific process, the qualification lapses and the welder must requalify. Some employers track continuity through welder continuity logs that document each welder's active processes and last use dates. There is no annual renewal test required by either code — only the 6-month use requirement.
A welder manually controls the welding arc — hand-held torch or electrode holder, controlling travel speed, arc length, and manipulation. A welding operator operates machine or automatic welding equipment where the machine controls one or more welding parameters. Under D1.1, welding operators qualify per Clause 6 Part C with different test requirements than manual welders. Under ASME IX, welding operators qualify per QW-300 with specific operator qualification tables (QW-360 through QW-362). The distinction matters because operator qualification tests focus on setup and monitoring skills rather than manual dexterity.
Not automatically. ASME IX and D1.1 are independent codes with separate qualification requirements. A welder qualified under ASME IX QW-300 holds a Welder Performance Qualification (WPQ) that documents tested conditions, P-Number ranges, and position ranges per ASME IX rules. D1.1 requires welder qualification per Clause 6 with D1.1-specific test requirements, base metal groups, and position qualification ranges per Table 6.11. However, if a welder's ASME IX test coupon meets D1.1 requirements — correct process, position, base metal group, and acceptance criteria — some employers accept it as dual qualification. This requires documented review by the responsible engineer.
Reference data from ASME BPVC IX:2025 and AWS D1.1/D1.1M:2025. Not affiliated with ASME or AWS.