Guide
How to Design a Welding Cart for a Multiprocess Welder
Designing this cart from scratch turned up a handful of rules that apply to any welding cart, especially one carrying a water-cooled TIG/MIG machine, gas bottles and a plasma cutter. Here they are, with the reason behind each.
1. Start from measured equipment, not catalog sizes
Catalog dimensions leave out handles, feet and fittings. This cart's welder was drawn at 28" only after measuring to its farthest point, and the bench at 46⅛" × 18³⁄₁₆" with the casters off. Those two numbers set the whole layout. Measure everything first, including the welder and cooler stacked together.
2. Decide the footprint limit and hold it
A cart has to fit through a door or into a bay. This one has a hard 33" depth limit. Holding that limit forced better decisions: the storage behind the welder went away, the welder's back moved flush with the cart, and the cords moved to hang off the end instead of needing their own slot.
3. Give the welder room to breathe and room for its leads
Inverter welders and coolers move a lot of air. Keep at least one side and the back open, and don't box them in with storage. This cart leaves a 3⅜" vent gap between the bench and the welder, an open back and an open right side. It also leaves 5" in front of the welder so the leads don't bend hard against the bench face. Check which side the MIG spool door is on, too. A door that faces a narrow gap won't open.
4. Put a frame member under every heavy thing
Light tube is fine if loads go straight down into it. The cylinders stand directly over a crossmember, every post lands on a frame member or caster plate, and the bench sits on pads at its own caster plates. When a member carries nothing, delete it. This cart has no crossmember under the middle of the bench for exactly that reason. See how the frame carries the load.
5. Tie the tops of your posts together
Tall posts on a light frame rack side to side. Gussets at the base help front to back. A shelf or rail that joins every post top stops the side-to-side sway. Here, the upper L shelf does that job and gives you storage at the same time.
6. Recess the casters if deck height matters
Bolting casters under a frame adds their full height to the deck. Recessing them into boxed pockets lowered this deck about 2" and kept the bench at a comfortable working height. The caster pocket guide shows how.
7. Plan the cuts around the stock you'll buy
A cutting plan turns "about six sticks" into exactly six. Nest the long pieces first, then fill gaps with short ones, and leave room for kerf and miter waste. This design was adjusted to keep every piece inside six 10 ft sticks with about 4" spare each. The cutting plan shows the result.
8. Spend effort only where it shows
Miter the outside corners people see, and butt everything hidden square. Cap visible open tube ends. The cart looks finished without turning every joint into a fitting job.