WELDING PROCEDURE SPECIFICATION (WPS)
Clause 5 — Prequalified — AWS D1.1:2020
WPS Number
WIQ-FCAW-71T1C-G1-TJ-001
Title
FCAW-G E71T-1C (CO₂) — CJP T-Joint Single-Bevel 45° — Group I — All Position
JOINT DESIGN
Code Reference
Figure 5.1 — TC-U4a-GF
Backing
steel — A36, min 3/8 in × 1 in
DESIGNATION: TC-U4a-GF (T-joint)
| DIMENSION | AS DETAILED | AS FIT-UP TOLERANCE | NOTES |
|---|
| Groove Angle (α) | 45° | +10°, −5° | T-joint single bevel |
| Root Opening (R) | 1/4 in | +1/16 in, −0 | — |
| Root Face (f) | 0 to 1/8 in | Not limited | — |
| Backing / Weld-Through | Steel backing or backgouge | — | — |
BASE METAL
Specifications
A36 (≤3/4 in), A53 Gr B, A500 Gr B, A500 Gr C, A501 Gr A, A516 Gr 55, A516 Gr 60, A516 Gr 65, A516 Gr 70, A524 Gr I/II, API 5L Gr B, API 5L X42
Thickness Range
3/16 in to 3/4 in
POSITION
Qualified Positions
1G, 2G, 3G, 4G
Vertical Progression
uphill
PREHEAT & INTERPASS TEMPERATURE
Minimum Preheat
32°F (≤3/4 in)
Code Reference
Table 5.8, Category B
APPROVED FILLER METAL SIZES
Welder may use any size listed below. Each size has its own amperage/voltage range and position limit per Table 5.1.
| Size | Class | Amps | Volts | Position Limit | Notes |
|---|
| 0.035 in | E71T-1C | 130-210 | 24-28 | All | Any pass |
| 0.045 in | E71T-1C | 150-300 | 24-30 | All | Any pass |
| 0.052 in | E71T-1C | 175-350 | 25-31 | All (reduced WFS for V/OH) | Any pass |
WELDING PARAMETERS
| Pass | Process | Filler / Class | Size | Current | Amps | Volts | Speed | Technique |
|---|
| Root | FCAW-G | E71T-1C | 0.035 in | DCEP | 130-210 | 24-28 | 8-16 in/min | either / uphill |
| Root | FCAW-G | E71T-1C | 0.045 in | DCEP | 150-300 | 24-30 | 8-16 in/min | either / uphill |
| Root | FCAW-G | E71T-1C | 0.052 in | DCEP | 175-350 | 25-31 | 8-16 in/min | either / uphill |
| Fill | FCAW-G | E71T-1C | 0.035 in | DCEP | 130-210 | 24-28 | 8-16 in/min | either / uphill |
| Fill | FCAW-G | E71T-1C | 0.045 in | DCEP | 150-300 | 24-30 | 8-16 in/min | either / uphill |
| Fill | FCAW-G | E71T-1C | 0.052 in | DCEP | 175-350 | 25-31 | 8-16 in/min | either / uphill |
| Cap | FCAW-G | E71T-1C | 0.035 in | DCEP | 130-210 | 24-28 | 8-16 in/min | either / uphill |
| Cap | FCAW-G | E71T-1C | 0.045 in | DCEP | 150-300 | 24-30 | 8-16 in/min | either / uphill |
| Cap | FCAW-G | E71T-1C | 0.052 in | DCEP | 175-350 | 25-31 | 8-16 in/min | either / uphill |
PREQUALIFIED VARIABLE TOLERANCES (TABLE 5.2)
| VARIABLE | TOLERANCE | NOTES |
|---|
| Amperage (Current) | ± 10% | From values specified on WPS |
| Voltage | ± 15% | From values specified on WPS |
| Travel Speed | ± 25% | From values specified on WPS |
| Wire Feed Speed | ± 10% | GMAW, FCAW, SAW only |
TABLE 5.1 ADDITIONAL LIMITS
•Pass width at surface ≥ pass depth (width/depth rule)
•Vertical progression: uphill (except undercut repair with ≥70°F preheat)
•Power source: Constant Voltage (CV) required
TECHNIQUE
Cleaning
Wire brush/grind. Remove all slag and spatter.
FIELD TIPS — WeldIQ
▸Maintain consistent stickout (5/8 to 1 in). Too long = excess spatter. Too short = burnback.
▸Check gas flow before welding — flowmeter should read 35-50 CFH. Draft/wind will blow gas away; use windscreens in field.
▸100% CO2: more penetration but more spatter than mixed gas. Good for thicker sections and field work.
▸Single bevel: bevel the plate that's easier to access. Unbeveled plate acts as natural backing in T-joints.
▸Verify preheat with a temperature-indicating crayon (Tempilstik) or contact pyrometer. Check 3 inches from the weld on both sides.
CODE CITATIONS
D1.1:2020 Clause 5.2 · Table 5.3 Group I · Figure 5.1 TC-U4a-GF · Table 5.4 (E71T-1C) · Table 5.8 Cat B
Generated by WeldIQ™ · AWS D1.1:2020 · Prequalified per Clause 5 — Prequalified