Lincoln Electric Square Wave TIG 175
The Lincoln Electric Square Wave TIG 175 is a solid mid-range TIG welder that delivers professional-quality welds on both aluminum and steel thanks to its square wave AC/DC inverter technology.
- Rated output
- 5–175 A
- Duty cycle
- 20% at 175A
- Steel window
- 0.5–4.4 mm
- Mass
- 55 lbs (25 kg)
- AC/DC dual welding
- Precise square wave control
- Portable pro-grade performance
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Running it
The Lincoln Electric Square Wave TIG 175 is a precision-engineered TIG welding machine built for hobbyists, farmers, and light industrial fabricators who need clean, controllable arc performance in a compact package. Running on standard 120/240-volt input power, this transformer-based unit delivers true square wave AC output for aluminum welding alongside DC output for steel, stainless steel, and other ferrous metals. With an output range that adjusts down to a very low amperage, it gives operators the fine control needed for thin-gauge materials, making it a favorite for auto body repair, small fabrication projects, and home shop work where precision matters more than raw power throughput. What sets this machine apart within Lincoln Electric's TIG lineup is its blend of simplicity and functional depth. The square wave technology allows for balanced cleaning and penetration control on aluminum, a feature typically reserved for higher-end inverter machines, while the analog interface keeps setup straightforward for welders who prefer dial-based controls over digital menus. High-frequency start ensures non-contact arc initiation, reducing tungsten contamination and preserving electrode life, while adjustable AC balance and frequency controls let users fine-tune the arc cone and puddle fluidity depending on material thickness and joint design. Pulse capability further extends its versatility, allowing better heat management on thin materials and reducing warping during long weld passes. Built with Lincoln Electric's reputation for rugged durability, the Square Wave TIG 175 features a heavy-duty enclosure designed to withstand shop environments, along with thermal overload protection to prevent damage during extended use. Its portability, thanks to a manageable weight and compact footprint, makes it easy to move between job sites or store in a garage without dedicating excessive floor space. Compatible with foot pedal and torch-mounted amperage controls, it accommodates both seated production welding and mobile fieldwork. For welders seeking a dependable, no-frills TIG machine that delivers professional-grade weld quality on both aluminum and steel without the complexity of inverter-based digital systems, the Square Wave TIG 175 remains a proven, trusted choice in the Lincoln Electric catalog.
The Lincoln Electric Square Wave TIG 175 is a solid mid-range TIG welder that delivers professional-quality welds on both aluminum and steel thanks to its square wave AC/DC inverter technology. It's an excellent choice for hobbyists, farm shops, and small fabrication businesses who need portability without sacrificing performance, though buyers should budget for accessories like a foot pedal separately.
The full plate
As stated by the manufacturer, 5 lines.
| Output Amperage Range | 5-175A |
|---|---|
| Input Voltage | 120V/240V dual voltage |
| Duty Cycle | 20% at 175A |
| Weight | 55 lbs (25 kg) |
| Process Type | TIG (GTAW) AC/DC and Stick |
What holds up
- Excellent arc stability on both AC and DC
- Portable and lightweight for a 175A machine
- Great value compared to similar-spec competitors
- Easy-to-read digital display for precise settings
- Smooth aluminum welding thanks to square wave AC
- Good customer support and parts availability from Lincoln Electric
What costs you
- Foot pedal sold separately in some kits
- Limited duty cycle at maximum amperage output
- Cooling fan runs constantly, which can be noisy
- No internal cart or wheels included
- Learning curve for beginners unfamiliar with AC/DC settings
Stated features
- 175A TIG output with square wave inverter technology
- High-frequency start for clean, non-contact arc initiation
- AC/DC capability for welding aluminum, steel, and stainless steel
- Adjustable AC balance and frequency controls
- Foot pedal and torch-mounted amperage control compatibility
- Pulse welding capability for improved heat control
- Built-in pre-flow and post-flow gas timers
- 120V/240V dual voltage input capability
4 people who bought it
I've used this machine for fabricating aluminum boat parts and it lays down beautiful beads. The AC balance control makes a huge difference in cleaning action. Highly recommend for anyone doing mixed metal work.
Performance is excellent once dialed in, but I was surprised the foot pedal wasn't included in the base package. Had to order one separately which added to the cost. Still a great welder overall.
Runs great on 240V and even does okay on 120V for thinner materials. The digital readout makes dialing in settings quick. Very happy with this purchase.
Compared to other brands at this price point, the Lincoln Electric Square Wave TIG 175 punches above its weight. Only complaint is the fan noise during extended use, but the weld quality makes up for it.
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