E71T-GS Flux-Core Wire: Settings & Single-Pass Guide
Single-pass flux-core wire for thin steel and home projects. Runs 25 to 150 amps on DCEN, rated for flat, horizontal, vertical up, overhead. Amperage chart by diameter below.
E71T-GS is the flux-core wire you find in small spools at hardware stores and home centers. It is designed for single-pass welds on thin mild steel with small 110V flux-core welders. It works for home projects, auto body patches, and light repairs, but it is not classified for multi-pass welding and should not be used on anything structural or load-bearing.
What This Means in Practice
E71T-GS is designed for single-pass welds on thin material. The 'GS' means it is a general specification wire, not tested to the multi-pass standards that E71T-11 meets. In practice, this means you should not use it for structural multi-pass welds. It excels at light gauge sheet metal, exhaust work, and small fabrication projects where a gas bottle is impractical.
What Amps for E71T-GS?
| Diameter | Amperage Range |
|---|---|
| 0.030" (0.8 mm) | 25 - 110A |
| 0.035" (0.9 mm) | 35 - 150A |
Amperage by Individual Diameter
0.030 E71T-GS Amperage
Set 0.030 E71T-GS to 25 - 110 amps. Run DCEN. A versatile mid-range size. Start at 68A and adjust: lower for thin material and out-of-position work, higher for flat fillets on thicker stock.
0.035 E71T-GS Amperage
Set 0.035 E71T-GS to 35 - 150 amps. Run DCEN. This is the most commonly used E71T-GS size. Start at 93A for flat work, drop to 35-84A for vertical-up.
E71T-GS Suitability Scores
How well this electrode matches common applications. Not a quality rating. all AWS-certified electrodes meet their specification.
What Is E71T-GS Good For?
Single-pass welds on thin mild steel (20 gauge to 3/16 inch).
Light-duty fabrication and home projects.
Small portable flux-core welders (110V machines).
Quick repairs where you do not have gas available.
Where E71T-GS Falls Short
Single-pass only per AWS classification.
Not tested or classified for multi-pass welding, meaning mechanical properties are unpredictable beyond one pass.
Not interchangeable with E71T-11 for multi-pass or structural applications.
Limited to thin material.
How E71T-GS Lays Down
Arc Behavior
Moderate crackle with less spatter than E71T-11. The arc is designed for lower amperage machines. Softer and easier to control on thin material than E71T-11.
How to Move
Drag (backhand) technique. Pull the gun at 15-30 degrees from vertical. Never push flux-core. Pushing traps slag in the weld and causes inclusions.
What the Puddle Does
Smaller puddle than E71T-11 with a thinner slag layer. The bead is narrower and lower profile. Solidifies faster, making it easier to control on thin material and vertical joints.
Troubleshooting
If the wire stutters and the arc keeps dying, your welder may not have enough power. E71T-GS needs stable low-amperage output. Check that your polarity is set to DCEN, not DCEP.
Matching E71T-GS Diameter to Your Steel
| Wire Size | Material Thickness | Application |
|---|---|---|
| 0.030" | 22 ga to 3/16" | Primary size for 110V welders |
| 0.035" | 1/8" to 1/4" | For 140A+ machines |
What the Spec Sheet Leaves Out
E71T-GS is the wire that ships with most small 110V flux-core welders from the hardware store. The GS means "general specification," which also means it has no AWS-defined mechanical property requirements beyond single-pass tensile. It works fine for hobby projects, auto body, and light repairs. Do not use it for multi-pass structural welds. For that, step up to E71T-11.
Bottom Line
This rod was made for repair work. Do not force it into pipe situations. E71T-11 covers what E71T-GS cannot.
Setup & Safety Reference
How to Store E71T-GS
Store dry and sealed. Single-pass wire; shelf life may be shorter than multi-pass types.
Preheat & Interpass Temperature for E71T-GS
Preheat varies by base metal thickness. E71T-GS is primarily a single-pass wire not typically used on thick material requiring preheat.
| Base Metal Thickness | Minimum Preheat (°F) |
|---|---|
| up to 3/4" | Not required |
| 3/4" to 1-1/2" | 150°F |
| 1-1/2" to 2-1/2" | 225°F |
| over 2-1/2" | 300°F |
Maximum interpass temperature: 600°F
Source: AWS D1.1 Table 3.2, Category A (non-low-hydrogen)
Wire Feed Speed for E71T-GS
Self-shielded, single-pass. Lighter duty than E71T-11.
| Diameter | Amperage | Wire Feed Speed (IPM) |
|---|---|---|
| 0.030" | 25-60A | 80-200 IPM |
| 0.030" | 60-110A | 200-380 IPM |
| 0.035" | 35-80A | 80-200 IPM |
| 0.035" | 80-150A | 200-400 IPM |
Deposition Rates
| Diameter | Deposition Rate |
|---|---|
| 0.030" | 1.5-3.5 lbs/hr |
| 0.035" | 2-5 lbs/hr |
Fume Generation
Rating: High
Typical fume rate: 0.7-1.5 g/min
Self-shielded. High fume similar to E71T-11.
Common Brand Names for E71T-GS
3 manufacturers sell an E71T-GS product. Lincoln Electric Innershield NR-1 is the one most shops stock.
| Manufacturer | Product Name | Notes |
|---|---|---|
| Lincoln Electric | Innershield NR-1 | |
| Hobart | Fabshield 21B-GS | |
| Forney | E71T-GS |
Full Specs
| Property | Value |
|---|---|
| AWS Classification | E71T-GS |
| Process | Flux-Core Welding (FCAW) |
| Polarity | DCEN |
| Positions | flat, horizontal, vertical up, overhead |
| Penetration | light |
| Coating Type | self-shielded flux-cored |
| Tensile Strength | 70,000 psi |
| Yield Strength | 58,000 psi |
| Elongation | 22% |
| Base Metals | carbon steel, low-carbon steel |
| Shielding Gas | Self-shielded (no external gas) |
| Max Interpass Temp | 600°F |
| AWS Specification | AWS A5.20/A5.20M:2021 |
E71T-GS Questions
What flux core wire for a 110V welder?
E71T-GS in 0.030 inch diameter. This is the wire sold in small spools at hardware stores specifically for 110V flux-core welders. It is designed for single-pass welds on thin mild steel (up to about 3/16 inch). It works without gas and is fine for home projects, auto body patches, and light repairs. For anything thicker or multi-pass, you need E71T-11 on a 220V machine. For heavier work, E71T-11 specifications on a 220V machine handles multi-pass welds and thicker material.
What does GS mean in E71T-GS?
GS stands for General Single-pass. This wire is classified only for single-pass welding and does not have minimum impact toughness requirements. For multi-pass work or applications requiring impact testing, use E71T-11 instead.
Can E71T-GS be used for multi-pass welding?
It is not recommended. E71T-GS is classified for single-pass use only. Multi-pass welding with E71T-GS can cause excessive manganese buildup in the weld, reducing toughness. Use E71T-11 for multi-pass applications.
Where to Buy E71T-GS
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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.