E71T-8 Seismic-Rated Self-Shielded Flux-Core Wire
Self-shielded flux-core wire with seismic demand classification. Runs 130 to 350 amps on DCEN, rated for flat, horizontal, vertical up, overhead. Amperage chart by diameter below.
E71T-8 is a self-shielded flux-cored wire classified under AWS A5.20 with T-8 designator indicating a self-shielded wire designed for all-position welding with DCEN polarity. It meets the requirements for use in seismic-demand applications under AWS D1.8 Structural Welding Code - Seismic Supplement. E71T-8 must pass Charpy V-notch impact testing at -20F with a minimum of 20 ft-lbs average. This wire is used for structural steel erection, including moment frames, braced frames, and connections in seismic zones. It requires no external shielding gas, making it practical for field erection where gas coverage is difficult. The self-shielded design tolerates wind better than gas-shielded processes. Typical applications include multi-story steel building erection, bridge structural connections, and industrial structures in seismic regions.
What This Means in Practice
E71T-8 is the structural upgrade to E71T-11. Both are self-shielded (no gas needed), but E71T-8 carries a seismic demand classification meaning it meets the stricter requirements of AWS D1.8 for buildings in earthquake zones. It also has mandatory Charpy impact testing at -20F, making it suitable for cold-climate structural work.
What Amps for E71T-8?
| Diameter | Amperage Range |
|---|---|
| 0.045" (1.2 mm) | 130 - 230A |
| 0.052" (1.3 mm) | 150 - 280A |
| 5/64" (2 mm) | 175 - 350A |
Amperage by Individual Diameter
0.045 E71T-8 Amperage
Set 0.045 E71T-8 to 130 - 230 amps. Run DCEN. This is the smallest available size. Best for vertical-up and overhead where you need a small, controllable puddle. Start around 180A.
0.052 E71T-8 Amperage
Set 0.052 E71T-8 to 150 - 280 amps. Run DCEN. A versatile mid-range size. Start at 215A and adjust: lower for thin material and out-of-position work, higher for flat fillets on thicker stock.
5/64 E71T-8 Amperage
Set 5/64 E71T-8 to 175 - 350 amps. Run DCEN. Largest available diameter. High deposition for flat and horizontal fillet welds on thick plate. Requires 175A minimum to run properly.
E71T-8 Suitability Scores
How well this electrode matches common applications. Not a quality rating. all AWS-certified electrodes meet their specification.
What Is E71T-8 Good For?
Use E71T-8 when the structural code or WPS specifies a self-shielded flux-core wire with seismic demand classification or -20F impact testing.
Required for AWS D1.8 seismic welding.
Preferred for field erection of structural steel in windy conditions where gas-shielded processes are impractical.
Where E71T-8 Falls Short
Produces more fume than gas-shielded wires.
Requires DCEN polarity (most MIG welders default to DCEP, so polarity swap is needed).
More expensive than E71T-11.
Spatter and slag are heavier than gas-shielded alternatives.
Not suitable for thin material.
Designed for structural steel, not general-purpose shop work.
Running E71T-8 Wire
Arc Behavior
Moderate crackle with steady, predictable arc behavior. Self-shielded like E71T-11 but with a tighter, more focused arc cone. Less spatter than E71T-11. Designed for structural work.
How to Move
Drag at 15-30 degrees. Same backhand technique as other self-shielded flux-core wires. Travel speed is moderate. The wire is designed for multi-pass structural joints, so consistency matters more than speed.
What the Puddle Does
Well-controlled puddle with a slag system designed for out-of-position work. The bead profile is slightly convex with good tie-in at the toes. The slag is thicker than E71T-1 and requires chipping between passes.
Troubleshooting
If you see porosity in the first inch of a bead, trim the wire back to clean material before restarting. The end of flux-core wire absorbs moisture and contamination from sitting exposed. Trim 1/2 inch before each start.
E71T-8 Size by Material Thickness
| Wire Size | Material Thickness | Application |
|---|---|---|
| 0.045" | 3/16" to 3/8" | Light structural field erection |
| 5/64" | 3/8" to 3/4" | Standard structural field connections |
| 5/64" | 3/4" and up | Heavy structural field erection |
What the Spec Sheet Leaves Out
E71T-8 is the wire that goes up on structural steel. When ironworkers are 200 feet in the air connecting beams, they are running E71T-8. It is self-shielded, so wind does not matter. It is seismic-rated per AWS D1.8 for demand-critical connections. It runs multi-pass without issue. No gas bottle to haul up a column. No shielding gas for the wind to blow away. E71T-8 was purpose-built for field erection of structural steel.
Bottom Line
Structural work is where E71T-8 belongs. Pipe is not its job. When E71T-8 is wrong for the job, reach for E71T-11.
Setup & Safety Reference
How to Store E71T-8
Store sealed in dry conditions. Self-shielded structural wire. Moisture in flux causes porosity.
Preheat & Interpass Temperature for E71T-8
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
Source: AWS D1.1 Table 3.2, Category B (low-hydrogen)
Wire Feed Speed for E71T-8
Self-shielded FCAW. No external shielding gas required. Ranges are starting points.
| Diameter | Amperage | Wire Feed Speed (IPM) |
|---|---|---|
| 0.045" | 130-220A | 200-400 IPM |
| 0.052" | 150-280A | 150-350 IPM |
| 1/16" | 180-350A | 120-300 IPM |
Deposition Rates
| Diameter | Deposition Rate |
|---|---|
| 0.045" | 4-7 lbs/hr |
| 0.052" | 5-9 lbs/hr |
| 1/16" | 6-12 lbs/hr |
Fume Generation
Rating: High
Typical fume rate: 0.8-1.6 g/min
Self-shielded structural wire. High fume generation.
Common Brand Names for E71T-8
3 manufacturers sell an E71T-8 product. Lincoln Electric Innershield NR-232 is the one most shops stock.
| Manufacturer | Product Name | Notes |
|---|---|---|
| Lincoln Electric | Innershield NR-232 | |
| Hobart | Fabshield 71T-8 | |
| ESAB | Coreshield 8 |
Full Specs
| Property | Value |
|---|---|
| AWS Classification | E71T-8 |
| Process | Flux-Core Welding (FCAW) |
| Polarity | DCEN |
| Positions | flat, horizontal, vertical up, overhead |
| Penetration | medium-deep |
| Coating Type | self-shielded flux core |
| Tensile Strength | 70,000 psi |
| Yield Strength | 58,000 psi |
| Elongation | 22% |
| Impact Toughness | 20 ft-lbs at -20°F |
| Base Metals | Structural steel (A36, A572, A992), Bridge steel |
| Shielding Gas | Self-shielded (no external gas) |
| Max Interpass Temp | 600°F |
| AWS Specification | AWS A5.20/A5.20M:2021 |
Frequently Asked Questions
What is the difference between E71T-8 and E71T-11?
Both are self-shielded flux-core wires, but E71T-8 is the structural upgrade. E71T-8 carries seismic demand classification for AWS D1.8 and requires Charpy impact testing at -20F. E71T-11 has no mandatory impact testing requirement and is not approved for seismic applications. Use E71T-8 for structural steel erection and code work. Use E71T-11 for general-purpose field welding and repairs.
Can I use E71T-8 on a standard MIG welder?
Yes, but you must switch the polarity to DCEN (electrode negative). Most MIG welders default to DCEP. Self-shielded flux-core wires like E71T-8 run on DCEN. You also need knurled drive rolls to grip the tubular wire without crushing it. No shielding gas is needed, so disconnect or turn off the gas solenoid.
Why is E71T-8 used for building erection?
E71T-8 is self-shielded, so it works in wind without losing gas coverage. Structural steel erection happens outdoors at height where wind is constant. E71T-8 also meets seismic code requirements (AWS D1.8), provides all-position capability for welding beam-to-column connections, and offers high deposition rates for the heavy welds required in moment frames.
Where to Buy E71T-8
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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, AWS D1.8. Amperage ranges are approximate starting points. adjust based on position, fit-up, and material thickness. Always follow manufacturer recommendations and applicable codes.