What's inside
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What bracket work demands from a TIG welder
Mild steel brackets are a good fit for TIG when appearance, access, or heat control matters more than speed. The trade-off is time: TIG requires both hands and steady filler feeding, and cleaning and tacking can take longer than the weld itself. For repeated brackets made from thicker plate, MIG is usually more productive.
For typical shop brackets in 1/8- to 1/4-inch mild steel, look for a machine with DC TIG, a usable low-amp range, adjustable post-flow, and enough output to weld the thickest part without running at its limit. A 200-amp inverter is a practical general-purpose size, not a guarantee of a particular duty cycle. Check the manufacturer’s duty-cycle rating at the amperage you expect to use: a rating of 60% at 200 amps means six minutes welding in a ten-minute period, followed by four minutes cooling.
Choose the process and power supply
Mild steel uses DC TIG; AC capability is needed for aluminum, not for steel brackets. Paying extra for AC/DC makes sense if aluminum is on your work list, but it does not improve a steel weld by itself. A DC-only machine with reliable controls can be the better buy for steel-focused work.
For 120-volt machines, expect less output and more limits on thicker material. They can be convenient for repair work and brackets around 1/8 inch, but may struggle to sustain the heat needed for a sound joint in 1/4-inch steel, especially on a long weld. A 240-volt supply gives more headroom. Confirm the welder’s input requirements, breaker recommendation, and plug type before buying; an adapter does not make an undersized circuit adequate.
Compare 200-amp DC TIG welders by duty cycle, control features, warranty, and what is included. Some packages omit a foot pedal, gas regulator, or suitable torch consumables, adding to the real cost.
Welder types at a glance
| Type | Best fit | Main compromise |
|---|---|---|
| 120-volt DC TIG | Light brackets, small repairs, limited-power shops | Less headroom on thicker plate and long welds |
| 240-volt DC TIG | Steel fabrication with no aluminum requirement | Needs the right circuit; no AC TIG capability |
| 240-volt AC/DC TIG | Steel now, aluminum work later | Higher price and extra settings that steel work does not need |
| MIG welder | Production brackets and longer fillet welds | Less precise heat and puddle control in tight or visible areas |
Controls and accessories that matter
A foot pedal gives fine control over heat as the joint warms up, which helps prevent burn-through near thin edges. A torch-mounted amperage control is useful when you weld in positions where a pedal is awkward. If the budget only allows one, choose based on how you will hold the torch and reach the work. A pedal is not essential for every bracket, but a basic machine with no convenient amperage adjustment can be frustrating on mixed thicknesses.
For steel, use 100% argon, a properly sized regulator or flowmeter, and a sound gas hose. Around 15–20 cubic feet per hour is a common starting range for a standard TIG cup indoors; excessive flow can create turbulence and pull air into the shielding gas. Drafts can spoil shielding even at a sensible flow rate. A decent helmet with a clear view of the joint is more useful than adding features to the welder while keeping a poor lens. Shop for a TIG-suitable auto-darkening helmet with a dependable low-amp rating and grind mode.
Budget for a cylinder, filler rod, tungsten, cups, gloves, and work-clamping gear if you do not already own them. For clean mild steel, ER70S-2 or ER70S-6 filler is commonly used; select rod diameter to suit the joint and current, rather than buying one size for everything. A 1/16-inch rod is a useful starting point for light bracket work, while thicker sections may call for larger rod.
Fit-up, settings, and common failures
Preparation decides whether the machine’s features matter. Remove mill scale, paint, oil, and rust from the weld area, and clean the filler rod too. Fit the pieces closely and tack them in several places so they do not shift as the weld shrinks. A gap that looks small can open into a hole when welding thin material.
Set amperage to the joint and position, then test on scrap of the same thickness. A rough starting point for steel is about 1 amp per 0.001 inch of material, but it is only a starting estimate: joint design, fit-up, torch angle, and heat sinking all change what works. For a 1/8-inch piece, that suggests roughly 125 amps at the upper end of the estimate; you may need less for a small fillet or more if the bracket pulls heat away. Avoid using a rule of thumb as a substitute for a test weld.
Common problems have practical causes. A dirty surface or contaminated tungsten can make the arc wander and the weld turn sooty; stop, grind the tungsten clean, and re-clean the steel. A hole at an edge usually means too much heat, too slow a travel speed, or poor fit-up. A tall, cold-looking bead may indicate insufficient heat or poor fusion, not a need to add more filler. Check penetration on a scrap joint before trusting a bracket that will carry a load.
When to spend more—and when not to
For occasional brackets in mild steel, a reputable DC-only inverter with stable output, a pedal or useful torch control, and local parts support is often enough. You do not need AC balance controls, memory programs, or a large color display to make sound steel fillets. Spend more if you need AC aluminum capability, frequent high-output welding, or a stronger duty cycle for longer production runs.
If speed and volume matter more than a controlled, narrow bead, a MIG welder may be the sensible purchase. For a first TIG setup, compare the 240-volt AC/DC TIG options only if aluminum is a real near-term need. Otherwise, put the difference toward a good torch, gas supply, helmet, and practice material. Whichever route you choose, verify the circuit and included accessories before checkout, and test the joint on scrap before fabricating a bracket that has to hold.