E71T-1 Gas-Shielded Flux-Core Wire: Amperage & Production Welding Guide
Gas-shielded flux-core for production welding. Runs 150 to 500 amps on DCEP, rated for flat, horizontal, vertical up, overhead. Amperage chart by diameter below.
E71T-1 is a gas-shielded flux-core wire designed for production welding on carbon steel. It requires 75/25 (Ar/CO2) or 100% CO2 shielding gas, unlike self-shielded wires (E71T-11, E71T-GS). The combination of tubular wire and external gas shielding produces high deposition rates, smooth arc transfer, and excellent mechanical properties including good low-temperature impact toughness. This is the standard flux-core wire in fabrication shops running semi-automatic and mechanized welding on structural steel, heavy equipment, and shipbuilding.
What This Means in Practice
E71T-1 means: E (electrode) + 7 (70,000 psi tensile) + 1 (all positions) + T (tubular/flux-core) + 1 (classification 1: gas-shielded, DCEP, good impact toughness). The T-1 vs T-11 distinction is critical: T-1 needs gas, T-11 is self-shielded.
What Amps for E71T-1?
| Diameter | Amperage Range |
|---|---|
| .045" (1.2 mm) | 150 - 300A |
| 1/16" (1.6 mm) | 200 - 400A |
| 5/64" (2 mm) | 250 - 500A |
Amperage by Individual Diameter
.045 E71T-1 Amperage
Set .045 E71T-1 to 150 - 300 amps. Run DCEP. This is the smallest available size. Best for vertical-up and overhead where you need a small, controllable puddle. Start around 225A.
1/16 E71T-1 Amperage
Set 1/16 E71T-1 to 200 - 400 amps. Run DCEP. A versatile mid-range size. Start at 300A and adjust: lower for thin material and out-of-position work, higher for flat fillets on thicker stock.
5/64 E71T-1 Amperage
Set 5/64 E71T-1 to 250 - 500 amps. Run DCEP. Largest available diameter. High deposition for flat and horizontal fillet welds on thick plate. Requires 250A minimum to run properly.
E71T-1 Suitability Scores
How well this electrode matches common applications. Not a quality rating. all AWS-certified electrodes meet their specification.
What Is E71T-1 Good For?
Production shops with gas-shielded FCAW setups.
Structural steel fabrication under D1.1.
Heavy plate fillet and groove welding where deposition rate matters.
Shipbuilding, heavy equipment, pressure vessels. Any application where you need higher productivity than solid MIG wire with all-position capability.
Where E71T-1 Falls Short
Requires external shielding gas (75/25 or CO2), not for outdoor or windy conditions.
More spatter than solid MIG wire in short-circuit mode.
Gas and wire cost together are higher than self-shielded FCAW.
The equipment must be set up for gas-shielded flux-core (different liner, contact tips, gas flow).
Running E71T-1 Wire
The Arc
Smooth, high-spray arc with moderate spatter. Less noise than E71T-11 because the gas shield stabilizes the arc. The sound is a steady buzz rather than a crackle.
Technique
Drag at 15-25 degrees from vertical. The gas shield means you have more flexibility in angle than self-shielded wire. Travel faster than stick. The high deposition rate means you cover ground at double the pace of E7018.
The Puddle
Large, well-shielded puddle with a thin slag layer. The bead is wider and flatter than E71T-11. The slag chips off easily between passes. The finished bead is smooth with regular ripples.
When It Goes Wrong
If you see porosity, check your gas flow rate (35-50 CFH for most work). If you see worm tracks, reduce voltage. If the wire pushes through without an arc, your contact tip is worn. Replace it.
E71T-1 Size by Material Thickness
| Wire Size | Material Thickness | Application |
|---|---|---|
| 0.035" | 3/16" to 3/8" | Light structural fabrication |
| 0.045" | 3/8" to 3/4" | Standard structural production |
| 1/16" | 3/4" and up | Heavy plate multi-pass production |
Real-World Notes
E71T-1 is the production workhorse of structural steel fabrication shops. It puts down metal twice as fast as E7018 stick with comparable mechanical properties. The gas-shielded arc produces cleaner welds than self-shielded E71T-11. Most steel fabrication shops running to AWS D1.1 use E71T-1 for everything that does not need to be done with stick. The trade-off is the gas bottle and indoor-only limitation.
Bottom Line
Use E71T-1 for structural work. Skip it for repair. Need something different? Look at E81T1-Ni1.
Setup & Safety Reference
How to Store E71T-1
Store sealed in dry area. Gas-shielded flux-core. If porosity occurs, check wire freshness before adjusting gas.
Shielding Gas for E71T-1
| Gas Mix | Common Name | When to Use |
|---|---|---|
| 75% Ar / 25% CO2 | C25 | Most common. Best balance of spatter control and penetration. |
| 100% CO2 | CO2 | Deeper penetration. More spatter. Lower cost per foot of weld. |
Gas-shielded flux-core. Must use external shielding gas. Higher deposition rates than solid wire.
Preheat & Interpass Temperature for E71T-1
Preheat varies by base metal thickness. Low-hydrogen processes require less preheat than non-low-hydrogen.
| Base Metal Thickness | Minimum Preheat (°F) |
|---|---|
| up to 3/4" | Not required |
| 3/4" to 1-1/2" | 50°F |
| 1-1/2" to 2-1/2" | 150°F |
| over 2-1/2" | 225°F |
Maximum interpass temperature: 600°F
Shielding gas flow rate: 35-50 CFH
Source: AWS D1.1 Table 3.2, Category B (low-hydrogen)
Wire Feed Speed for E71T-1
Gas-shielded flux-core. Higher deposition rates than solid wire.
| Diameter | Amperage | Wire Feed Speed (IPM) |
|---|---|---|
| 0.045" | 150-220A | 200-350 IPM |
| 0.045" | 220-300A | 350-550 IPM |
| 1/16" | 200-300A | 150-300 IPM |
| 1/16" | 300-400A | 300-500 IPM |
| 5/64" | 250-370A | 100-250 IPM |
| 5/64" | 370-500A | 250-400 IPM |
Deposition Rates
| Diameter | Deposition Rate |
|---|---|
| 0.045" | 6-13 lbs/hr |
| 1/16" | 8-18 lbs/hr |
| 5/64" | 10-23 lbs/hr |
Fume Generation
Rating: Medium
Typical fume rate: 0.4-0.8 g/min
Gas-shielded flux-core. Less fume than self-shielded types. Argon-rich gas reduces fume.
Common Brand Names for E71T-1
3 manufacturers sell an E71T-1 product. Lincoln Electric Outershield 71M is the one most shops stock.
| Manufacturer | Product Name | Notes |
|---|---|---|
| Lincoln Electric | Outershield 71M | |
| Hobart | FabCO 711 | |
| ESAB | Dual Shield 7100 Ultra |
Full Specs
| Property | Value |
|---|---|
| AWS Classification | E71T-1 |
| Process | Flux-Core Welding (FCAW) |
| Polarity | DCEP |
| Positions | flat, horizontal, vertical up, overhead |
| Penetration | medium-deep |
| Coating Type | tubular flux-core (gas-shielded) |
| Tensile Strength | 70,000 psi |
| Yield Strength | 58,000 psi |
| Elongation | 22% |
| Impact Toughness | 20 ft-lbs at -20°F |
| Base Metals | carbon steel, low-alloy steel |
| Shielding Gas | 75% Ar / 25% CO2, 100% CO2 |
| Gas Flow Rate | 35-50 CFH |
| Max Interpass Temp | 600°F |
| AWS Specification | AWS A5.20/A5.20M:2021 |
E71T-1 Questions
Does E71T-1 require shielding gas?
Yes. E71T-1 is a gas-shielded flux-core wire. It requires 75/25 (argon/CO2) or 100% CO2 shielding gas. This is different from self-shielded wires like E71T-11 and E71T-GS which need no external gas.
What is the difference between E71T-1 and E71T-11?
E71T-1 is gas-shielded with higher deposition rates and better mechanical properties, designed for production welding. E71T-11 is self-shielded for field and maintenance work where gas coverage is impractical.
Can E71T-1 be used without gas?
No. Running E71T-1 without shielding gas produces porous, contaminated welds. If you need gasless flux-core, use E71T-11 or E71T-GS instead.
Where to Buy E71T-1
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Manufacturer Data Sheets
External links to standards bodies and manufacturers. These leave GageRef.
Reference data only. Verify all settings against manufacturer documentation and the applicable welding code before use. Amperage ranges are starting points that vary by position, fit-up, and material. Welding involves serious injury risks including burns, electric shock, fume exposure, and fire. This site does not replace proper training, certification, or employer safety procedures. See full terms of use.
Data sourced from AWS A5.20/A5.20M. Amperage ranges are approximate starting points. adjust based on position, fit-up, and material thickness. Always follow manufacturer recommendations and applicable codes.