Welding Basics for Makers: MIG, Stick, and TIG Compared, and When You Actually Need One

Most of the content on this site is about subtractive and additive processes that don't involve an electrical arc hot enough to blind you from across a garage — 3D printing, laser cutting, CNC routing. But once you start building machine stands, CNC frames, trailer hitches, brackets, or anything that needs to survive real structural load, wood screws and 3D printed brackets stop being the right answer. Welding is the maker skill most people skip because it looks intimidating and the equipment looks expensive, but a basic MIG setup is now cheaper than a lot of 3D printers, and for load-bearing metal fabrication there's no substitute. This guide covers the three processes a home shop is likely to actually use, what to buy first, and the safety practices that are non-negotiable.

The Three Processes That Matter for a Home Shop

ProcessFull NameBest ForLearning CurveTypical Entry Cost MIGMetal Inert Gas (GMAW)Mild steel, general fabrication, thicker materialEasiest — feeds wire automatically$200–$600 StickShielded Metal Arc Welding (SMAW)Outdoor work, rusty/dirty metal, repairs, thick steelModerate — harder to strike and maintain an arc than MIG$100–$300 TIGTungsten Inert Gas (GTAW)Aluminum, stainless, thin material, precision/cosmetic weldsSteep — two-handed, foot pedal control$400–$1500+

MIG: The Right First Welder for Almost Everyone

If you're building your first welder-adjacent project — a CNC frame, a rolling machine cart heavier than casters can flex, a trailer rack, a metal enclosure — MIG is almost always the answer. It feeds a continuous spool of wire through the gun, and a shielding gas (typically 75/25 argon/CO2, called C25) protects the weld puddle from atmospheric contamination. The learning curve is short: hold a consistent angle and travel speed, keep the right stickout, and you can be laying usable beads on mild steel within an afternoon.

Flux-cored MIG (no external gas bottle, using tubular wire with flux inside) is a reasonable way to start even cheaper and works better outdoors where wind would blow shielding gas away, but gas-shielded MIG gives cleaner, stronger welds with less spatter for shop use. A 120V MIG welder in the 140–180A class handles up to about 1/4″ mild steel in a single pass and covers the vast majority of hobby fabrication. If you're building anything structural — a CNC gantry stand, a welded tool cart to replace a bolted rolling multi-machine cart — that's the class of machine to buy.

Stick Welding: Cheap, Portable, and Forgiving of Dirty Metal

Stick welding uses a flux-coated consumable electrode that burns away as you weld, with the flux coating generating its own shielding gas as it burns. No gas bottle, no wire feeder — just a power source and electrode holder, which is why stick welders are the cheapest and most portable option. The tradeoff is technique: striking and maintaining a stable arc takes more practice than pulling a MIG trigger, and stick welds are generally messier with more spatter and slag to chip off afterward.

Where stick still wins: welding outdoors or in a breezy garage (no shielding gas to blow away), welding through mill scale, rust, or paint that would ruin a MIG weld, and thick structural steel where deep penetration matters more than cosmetics. If your projects are more "repair the trailer" than "build a precision fixture," a stick welder is the cheapest path to being useful.

TIG: Precision and Aluminum, at the Cost of a Steep Learning Curve

TIG uses a non-consumable tungsten electrode and a separate filler rod fed by hand, with argon shielding gas and (usually) a foot pedal controlling current in real time. It's the only process on this list that welds aluminum cleanly in a home shop, and it produces the cleanest, most precise welds of the three — useful for thin sheet metal, bicycle frames, exhaust work, and anything where the weld itself needs to look good. The tradeoff is that TIG is genuinely difficult to learn: you're controlling torch angle, filler rod feed, and pedal current simultaneously, and it's slow compared to MIG. Most home shops that own a TIG machine also own a MIG machine and reach for TIG only when the material or the finish requires it.

Which One Should You Actually Buy First?

Building steel frames, brackets, and shop furniture (most makers): a 120V/240V dual-voltage MIG welder in the 140–180A range. This covers the largest share of "I need to join two pieces of metal" projects.
Tight budget, mostly outdoor or repair work, dirty/rusty material: a basic inverter stick welder. Cheap, portable, and it doesn't care about clean metal the way MIG does.
Aluminum, motorcycle/bike frames, thin stainless, or cosmetic welds matter: TIG, but budget real time for practice before you trust a TIG weld structurally.

A modern inverter-based multi-process machine (MIG/stick/TIG in one box) is a reasonable way to hedge if you're not sure which process you'll use most, though a dedicated single-process machine is usually cheaper and simpler for a given budget.

Safety: Read This Before You Strike an Arc

Welding safety isn't optional, and the failure modes are worse than almost anything else in a maker shop:

Arc eye / UV burns: the arc emits intense UV and IR radiation that will burn your corneas ("arc flash" or "welder's flash") in seconds without proper eye protection, and the damage often isn't felt until hours later. A proper auto-darkening welding helmet rated for the process is mandatory — sunglasses and safety glasses do nothing against arc UV.
Fire: welding produces sparks and molten spatter that travel several feet. Clear the area of anything flammable (sawdust, solvents, wood scraps, the shop vac full of dust), keep a fire extinguisher rated for the materials present within reach, and never weld near an open container that held flammable liquid without purging it first.
Fumes: welding fumes contain metal oxide particulates and, depending on coatings, genuinely toxic compounds — galvanized (zinc-coated) steel in particular releases zinc oxide fumes that cause "metal fume fever," and painted or coated metal can release far worse. Weld in a ventilated area, use a fume extractor or work near an open door/window with airflow moving fumes away from your face, and never weld galvanized steel without grinding the coating off the weld area first and ventilating aggressively.
Electrical shock: welders run high current through the workpiece and electrode circuit. Keep cables in good condition, don't weld in wet conditions or while standing in water, and be aware that stick welding in particular can produce open-circuit voltages worth respecting.
PPE beyond the helmet: leather welding gloves, a flame-resistant jacket or leather apron, and closed-toe leather boots. Cotton is acceptable for lighter work but synthetic fabrics (polyester, nylon) can melt onto skin from spatter and should be avoided entirely.

Getting Started

Practice on scrap mild steel before attempting anything structural. Run beads on flat plate first, then work up to lap joints, T-joints, and butt joints in different positions. A local community college or maker space welding class is worth the cost if one is available — watching someone correct your torch angle and travel speed in person will save you weeks of trial and error compared to video tutorials alone. Once you're comfortable, welding opens up an entire category of shop-built equipment — machine stands, tool carts, CNC frames, and repairs — that no amount of 3D printing or CNC routing can substitute for.

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