MIG Welding Calculator
Determine optimal Wire Feed Speed (WFS), arc voltage, and shielding gas flow based on steel plate thickness and wire diameter.
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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.