How to weld for the first time

The first session, in order

That is the whole plan, and the discipline is in what it leaves out. A first session is not for building anything, not for joining two pieces, and not for getting a weld you would show someone. It is for finding out what the arc sounds like when the settings are roughly right, which is the thing no amount of reading transfers.

The welding starter kit checklist covers what to own before you get here. This page assumes the box is open.

Before you strike an arc: the ten-foot rule

Welding sparks travel much further than people expect, and a flux-core arc throws them in every direction including behind you. Before anything else:

Clear ten feet. No fuel cans, no aerosols, no sawdust, no cardboard, no paint tins, no dry leaves. Not covered — gone. A spark finds the one thing you decided would probably be fine.

Ventilate, properly. Open the door, and put a fan blowing across the work and away from your face rather than at it. A fan pointed at the weld strips shielding gas and causes porosity, and a fan behind you pushes fume into your breathing zone. Welding respirators and fume safety covers what is actually in the fume.

Have a way to put a fire out, within reach rather than in the house.

Cover your skin. Long sleeves in cotton or leather, trousers over your boots, nothing synthetic. An arc gives you sunburn through a single session and synthetic fabric melts rather than chars.

Setting the machine without a chart in your head

Almost every wire-feed welder has a settings chart printed inside the wire-compartment door, matched to the machine and the wire sizes it takes. On your first session that chart is the best information available to you, and it is better than any general table on the internet including ours.

Find your material thickness on it, set the voltage or tap it suggests and the wire-feed speed to match, and leave it there. Do not start by adjusting things. The purpose of the first bead is to give you a reference point, and you cannot have one if you changed three variables before laying it.

Our flux-core settings chart is there for when your machine's own chart is missing or unreadable, not as a replacement for it.

Scrap first, and clean it

Use a piece of scrap around an eighth to a quarter inch thick. Thinner is harder, not easier — thin steel burns through while you are still learning to move at a steady pace.

Then clean it. Grind or wire-brush the surface to bright metal, not just wipe it. Mill scale, rust, paint and oil all stop the weld fusing properly, and a first-timer looking at a bad bead cannot tell whether the cause was their hands or the surface. Removing that ambiguity is worth five minutes.

Clamp the work and clamp the earth lead to clean bare metal on the same piece. A poor earth connection produces an arc that stutters, which feels exactly like a technique problem.

Posture, which decides more than you would think

Sit if you can. Rest both forearms on something. Get the joint at a height where your head is over it without your neck craning, because the moment your neck is working your hands stop being steady.

Hold the gun with two hands — one on the handle, one supporting the neck or resting on the work. Nearly every first-timer holds it like a drill, one-handed and out in free air, and then wonders why their travel speed wanders.

Then nod the hood down and make sure you can still see the joint before you pull the trigger. Knowing where the weld starts while the hood is dark is a real skill, and the trick for day one is to look at where the wire touches the metal, not at the joint as a whole.

Your first bead: four inches, then stop

Lay a bead on the flat face of the scrap — not a joint, just a line on the surface. This is called a pad or a practice bead, and it isolates the one thing you are learning: moving at a steady speed with a steady stick-out.

Push the gun along at the pace of a slow, deliberate pen stroke. Keep the tip roughly three-eighths of an inch from the work. Angle the gun around fifteen degrees from vertical. On flux-core, drag — pull the gun away from the bead rather than pushing into it — and flux-core push or pull explains why that is different from gas MIG.

Four inches. Then stop, lift the hood, and let it cool before you touch it. Hot steel looks exactly like cold steel.

Reading your first bead

Chip the slag, brush it, and look at four things.

Then change one thing and lay another bead beside the first. One variable at a time is the entire method, and keeping the test piece gives you something to compare against in a week.

Two beads in a session is a good session. If you got a bead you understand, you are ahead of where most people are after three. Beginner welding mistakes is the page for when something specific goes wrong, and welding projects by skill level is where to go once beads are boring.

If you are still deciding whether to start at all, is welding hard to learn gives an honest answer process by process — an afternoon for flux-core and MIG, months for TIG — and names what is actually difficult in each.