MIG Welding Calculator
Determine optimal Wire Feed Speed (WFS), arc voltage, and shielding gas flow based on steel plate thickness and wire diameter.
How MIG Voltage and Wire Feed Speed Relate
Unlike Stick or TIG welding where amperage is set on the machine dial, a Constant Voltage (CV) MIG power supply allows you to set Voltage and Wire Feed Speed (WFS).
Amperage is determined directly by wire feed speed: feeding wire faster forces the power supply to deliver more amperage to burn it off at the set voltage.
Base Current Rule: 1 Amp per 0.001" steel thickness
Voltage sets puddle width and flatness; WFS sets penetration depth and bead height.
Frequently Asked Questions
What shielding gas is best for general mild steel MIG?
75% Argon / 25% CO2 (C25) is the industry standard for short-circuit MIG on mild steel, providing smooth arc stability with minimal spatter.
What is the standard wire stick-out distance?
Maintain a 1/4" to 3/8" wire stick-out (contact tip to work distance). Excessive stick-out cools the arc and loses gas shielding coverage.
Can .030 wire weld 1/4" plate in a single pass?
Yes, running near maximum machine output (~180-200 Amps). However, .035" wire is preferred for 1/4" and thicker plate to achieve faster deposition and deeper root penetration.