Intermediate garage welding and fab setup

This is the buy-once weld shop for someone who has run a small welder for a season and now builds frames, brackets, trailers and fixtures. It is the middle rung of the welding and fab ladder: the beginner build starts with a 140A machine, the expert build adds a 60 gallon 240V compressor and the circuits to match, and the setups hub lists all three.

The product choices are researched from manufacturer listings, published specifications and owner reviews, not from our own bench time. The rule for this tier is to add the two capabilities that change what you can build: a plasma cutter, which turns sheet and plate into clean parts, and the compressed air to drive it. Both pull on the electrical system, so the circuit plan matters more here than the machine list.

The layout assumption is the 20 x 20 welding and fab layout: one bay holds the weld table, the cart, the plasma cutter and the grinding station, and the other bay is the car's, with the car parked outside while you weld. Sparks, spatter and grinding dust belong nowhere near paint, fuel or a battery. A sedan is about 16 ft long and 6.2 ft wide; even in a 20 x 20 bay with the car in the far bay, keep the weld table at the far end from it and use a welding blanket.

Who should not buy this tier

If you have not welded a bead, start with the beginner build. If you want to cut thick plate daily or run long jobs, a hobby plasma cutter and a 20 gallon compressor will frustrate you; read the duty cycle and the cut thickness on the listings. If the panel has no room for a 50 A circuit, the 205A welder runs on 120V at reduced output. And if the garage is a tight one-car bay, this tier does not fit: use the 12 x 22 welding layout and choose the beginner list.

• A 60 gallon compressor. That is the expert build, with its 240V circuit. A 20 gallon unit runs a plasma cutter in short cuts.
• Both options in each pair. The list names alternatives for the welder, compressor, vise and bench grinder. Buy one of each.
• A CNC plasma table. Learn to cut by hand first.
• A TIG welder as a separate machine. The multi-process welders on this list do lift TIG; a dedicated AC/DC TIG machine is for aluminum fabricators.
• A fume extraction arm. A fan and a respirator do the job in a garage.
• Anything that needs three-phase power.

1. Helmet and gloves. A good auto-darkening helmet and gloves change how long you can work.
2. The welding surface. A heavy flat steel table with holes for clamps turns fit-up from a fight into a routine.
3. Consumables. Plasma tips and electrodes, contact tips and nozzles. Keep spares.
4. Ventilation. A fan that moves fume away from you and out of the door.
5. The compressor. When the plasma cutter outruns the tank, step up to a 60 gallon, 230V unit: the 60 gallon fit sheet shows it in each garage size.

A 20 x 20 two-car garage has a 16 ft door and 400 sq ft of floor. The weld table and cart take a bay about 8 to 10 ft along the wall, the plasma cutter and compressor sit nearby on the same wall, the bench grinder and vise on a second, and the 24 to 36 in operator zone stays clear. The car goes outside while you weld. If you park the car in the far bay while you grind, keep a welding blanket or a barrier between it and the grinder, because grinding sparks travel further than people expect. The layout calculator packs your list into your bay with and without a car. Sedan numbers: about 16 ft by 6.2 ft, parked 12 in from the door.

The compressor is the noisy item. In an attached garage, a quiet-series oil-free unit is the polite choice, and the compressor stands against a wall away from the weld table, since compressors draw air from the room and should not pull fume past the operator. For compressor sizing, see the compressor for sanding and grinding page.

Three machines draw real current. A 205A welder at 240V wants a 6-50 receptacle on a 50 A breaker in the usual setup; read the listing for the input current. The plasma cutter takes 120V or 240V, and 240V gives more cutting capacity. The 20 gallon, 2 HP compressor is a 120V machine: use a 20 A circuit of its own. Under NEC Table 430.248 a 2 HP single-phase motor draws 24 A at 115V or 12 A at 230V, so a 120V 2 HP compressor is a heavy load and should not share a circuit with the grinder.

That adds up to: one 50 A, 240V circuit for the welder (and the plasma cutter, one at a time), one 20 A for the compressor, one for the bench, one for lights. A 60 A subpanel fed with 6 AWG gives you the room. The 240V circuit calculator, the workshop amps calculator and the welding and fab subpanel page do the sum; the outlet install cost calculator estimates the electrician. Never run a welder on a dryer cord or a double-tapped breaker.

The garage is a worse place to weld than a shop because it holds a car, stored paint, cardboard and often a water heater with a pilot. Clear a 10 ft radius around the table. Keep gas cylinders upright and chained to the cart or wall. Do not weld or cut a fuel tank, a drum or any closed container. Do not weld galvanized, plated or painted steel without grinding off the coating and ventilating. After you finish, walk the shop, check behind the table and under the bench, and check again in an hour. Have an extinguisher where you can reach it without crossing the table. This page is planning information, not safety instruction: follow the welder manual, your local fire code and your insurer.

1. Safety and the circuit. Extinguishers, respirator, helmet, gloves and the 6-50 circuit on a licensed electrician's schedule.
2. Welder and cart. Then grinders and clamps.
3. The compressor, then the plasma cutter. The compressor first, so the plasma cutter has air when it arrives.
4. Vise, chest and cabinet.
5. Air filtration and light.

For generic references such as steel gauges and wire feed speeds see WorkshopCalc. The 240V MIG welder fit sheet shows a welder in each garage size.