Free fabrication calculators • Welding references • Project planning • Affiliate tool recommendations
Build it. Weld it. Price it.

MIG Settings Guide

Use your welder’s chart as the primary starting point, then use this guide to understand what to adjust.

Reviewed 2026-10-07

Enter thickness and wire diameter.
Planning tool only. Verify actual material, manufacturer data, code/WPS requirements and project conditions where applicable.
Advertisement

Use the machine chart first

MIG settings vary by welder design, wire brand, gas, transfer mode, joint and stickout. The door chart or manufacturer table is the best starting point for that machine.

What to tune

If the arc is harsh and stubbing, wire-feed speed may be too high for the voltage. If the arc is long and unstable, voltage may be too high or wire feed too low. Listen and watch the puddle rather than chasing a universal number.

Common mistakes

Wrong polarity, poor work clamp connection, excessive stickout, dirty material, mismatched contact tip and incorrect gas flow cause problems that look like “bad settings.”

Relevant gear

Useful tools for this job

Tools that match this task — not a random product wall.

Frequently asked questions

What is the best MIG setting for mild steel?

There is no single best number. Start with the welder door chart or manufacturer chart for wire diameter, gas and thickness, then tune for joint and position.

Should I use .030 or .035 wire?

.030 is common for lighter material and lower-output machines; .035 is common for general fabrication and thicker work. Machine capacity and procedure matter.

Does voltage control arc length?

In constant-voltage MIG, voltage strongly affects arc length/shape while wire-feed speed strongly affects amperage/current demand.