Step-by-step

How to use your inverter welder.

A beginner-friendly walkthrough for stick (MMA) welding with the Greenfield ProLite MMA200A — from setup to your first clean bead.

Before you start

Set up for success.

Stick welding is the easiest way to start — cheap electrodes, no gas, and it works outdoors. This guide covers the basics with the MMA200A. Always read your manual and the safety guide first.

1 · Set up the machine2 · Choose the right electrode3 · Dial in the amperage4 · Strike the arc5 · Run the bead
Safety first

Wear your full PPE, work in a ventilated area clear of flammables, and keep everything dry. Read the Welding & Safety guide before your first arc.

1

Set up the machine

Place the welder on a stable, dry surface with airflow around it. Connect the earth (work) clamp to clean, bare metal on your workpiece — rust and paint stop a good circuit. Plug the electrode holder lead into the positive or negative terminal as your electrode requires (most general rods run DC electrode-positive).

A solid earth connection is the single biggest factor in an easy arc. Clamp to clean metal, close to the weld.
2

Choose the right electrode

For general mild steel, a 6013 rod is the most forgiving starting point. Match the electrode diameter to the metal thickness — a 2.5mm rod suits thin 2–5mm steel; step up to 3.2mm for thicker sections. Keep electrodes dry; damp rods weld poorly.

3

Dial in the amperage

Set the current to suit the rod and thickness. Too low and the rod sticks; too high and it burns through. Use this as a starting point, then fine-tune on a scrap offcut:

4

Strike the arc

Lower your helmet. Strike like striking a match — scratch the rod across the metal and lift slightly to about 3mm. Too far and the arc dies; too close and the rod sticks (snap it free or release the holder). Hold a short, steady arc — you’ll hear a steady crackle like frying bacon when it’s right.

If the rod keeps sticking, nudge the amperage up a little and keep the arc short and consistent.
5

Run the bead

Tilt the electrode about 10–15° in the direction of travel and move at a steady pace, keeping the arc length constant. Watch the molten pool, not the arc — aim for a consistent, slightly overlapping ripple. When you finish, chip off the slag and wire-brush to inspect: a good weld is even, well-fused and free of holes.

Fixing common problems

Troubleshooting.

Rod keeps stickingAmperage too low, or arc held too long in one spot. Increase current slightly and keep moving with a short arc.
Burn-through / holesAmperage too high for the metal, or travel too slow. Lower the current and speed up your travel.
Lumpy, uneven beadInconsistent arc length or travel speed. Practice a steady hand on scrap; let the pool guide your pace.
Excessive spatterArc too long, damp electrode, or wrong polarity. Shorten the arc, use dry rods, and check your terminal connections.

Get the gear that makes it easy.

The ProLite MMA200A: light, stable IGBT inverter power that’s forgiving for beginners and dependable for pros.

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