Tubular WPS · Clause 10
How do you select an AWS D1.1 tubular joint route?
Start with the connection shown on the drawing, then identify weld type, access, backing, process and production position. A pipe butt weld and a branch-to-chord T/Y/K connection use different Clause 10 branches. The connection name alone does not establish a prequalified WPS or PQR coverage.
Record the connection before choosing a detail
Clause 10 covers round, square and rectangular tubular members within its stated scope, including tubular butt joints and tubular-to-tubular or tubular-to-plate T/Y/K connections (10.1–10.1.2). For a real connection, retain at least:
- Which member is the chord/main member and which is the branch, including round or box section and its dimensions and wall thickness.
- Whether the weld is a circumferential butt, T/Y/K branch, lap, or another actual configuration; and whether the required weld is CJP, PJP or fillet.
- Single- or double-sided access; backing material and whether it remains; and whether the reverse side is backgouged.
- Process and transfer mode, sequence, production position, fit-up dimensions and the local angles shown by the connection geometry.
Do not replace a dimensioned connection detail with “full penetration,” a generic bevel angle or a single average branch angle. The applicable figure and its notes supply the detail-specific limits.
Choose the butt-joint or T/Y/K branch
| Target connection | Prequalified starting point | When the simple route does not fit |
|---|---|---|
| Tubular butt, CJP | Clause 10.10.1 permits applicable Clause 5 details for double-sided construction or a single-sided detail with backing, subject to the selected detail and all prequalification conditions. The stated SAW exception requires nominal diameter at least 24 in [600 mm]. | Single-sided CJP without backing has no prequalified joint detail under 10.10.1(2); use a supported Clause 6 qualification route for the actual joint. |
| T/Y/K branch, CJP without backing | Use the dedicated 10.10.2 route for its permitted SMAW/FCAW processes: Figures 10.7–10.9 and Tables 10.6–10.7. Choose a permitted detail for every relevant local Ψ around the branch and retain each selected groove, root opening and completed-weld limit. | GMAW short-circuit transfer requires the Clause 10.14.4.3 qualification path; the dedicated prequalified details are not a general GMAW spray route. For a PQR-based route, Table 10.8's ordinary position coverage excludes local Ψ below 30°; the special 10.14.4.2 test path applies at 15°–30°, and below 15° is not permitted by that test path. Do not erase the separate Figure 10.7–10.9 Detail D geometry by applying this PQR footnote to prequalification. |
| T/Y/K branch, PJP or fillet | Check 10.9.1/Figure 10.6 for PJP and Figure 10.5 for fillet geometry, with the applicable process and general Clause 5 conditions. Matched box corners have additional detail or local macro requirements. | Use the relevant PQR/Clause 10 qualification branch when process, geometry or production conditions are outside the prequalified route. Do not treat a fillet size or a plate WPS as proof of branch-joint coverage. |
For a tubular fillet, Figure 10.5 has location-specific toe, side and heel requirements, plus branch-to-chord proportion and fit-up limits. For a T/Y/K PJP groove, Figure 10.6 controls the branch geometry and effective throat. These are not interchangeable with general non-tubular fillet or PJP details.
Keep the two angles and the Z-loss lookup separate
At a branch connection, local dihedral angle Ψ describes the angle between the branch and chord surfaces at a location around the connection. It can change from toe through side to heel, so Details A–D under 10.10.2 must be checked against the local geometry. Included groove angle φ is the angle of the prepared groove. It is a separate joint-preparation measurement.
Use the finished effective throat/size after the applicable Z-loss, together with the exact selected figure. The applicable selection and dimensions are sensitive to location, process, position and preparation. This guide intentionally does not reproduce a generic Z-loss number or connection diagram that could be detached from its source conditions.
Decide whether the procedure is prequalified or PQR-based
A prequalified route must meet both the general Clause 5 requirements and the specific Clause 10 branch. If the production joint does not match an available prequalified detail or its restrictions, check whether a traceable PQR qualifies the same type of tubular test, weld type, position and production object. Tubular PQR position coverage is read from Table 10.8 by test row and target column, then the appropriate thickness/diameter and joint-detail rules in 10.13–10.14 and Tables 10.9–10.11 are applied.
A plate test is not a blanket T/Y/K qualification. Clause 10.14.3 provides a limited plate-test route for T/Y/K connections with nominal outside diameter at least 24 in [600 mm], using the specified Clause 6.10 test and Figure 10.17 detail. It does not extend to smaller diameters or arbitrary branch details. A successful welder test or 6GR card is personnel evidence, not a substitute for WPS/PQR coverage.
- Identify the actual test coupon and joint: plate, pipe or box tube; butt or T/Y/K; CJP, PJP or fillet.
- Use the Table 10.8 row and exact production column, including errata-corrected entries and every footnote.
- Check the relevant dimensional qualification range and special macro/mock-up requirements. For single-sided, no-backing T/Y/K CJP, 10.14.4.1 requires tested geometry boundaries; do not extrapolate beyond them.
- Intersect that result with the actual PQR variables, material combination, thickness/deposit, CVN conditions and production requirements.
For the position matrix and its plate/tubular boundary, see which production positions a PQR covers. For A500-specific material grouping and preheat inputs, see the A500 HSS guide; grade and material grouping still do not determine the joint qualification route.
Code basis and limits
Basis: AWS D1.1/D1.1M:2025 base edition plus registered AWS base-edition errata dated July 28, 2026; AMD1 is not included. Principal provisions are 10.1–10.1.2 (scope), 10.5.2.2 and 10.5.3 (tubular geometry), 10.8–10.10 (prequalified branches), Figures 10.5–10.9 and Tables 10.5–10.7 (preparation and tubular dimensions), and 10.12–10.14/Tables 10.8–10.11 (qualification). The applicable contract edition governs.
This guide routes a decision; it does not size a structural connection, approve a detail, establish a particular PQR's results or certify a WPS. Use the controlled project drawing and full applicable code detail before production.