GAS METAL ARC WELDING (GMAW)SHIELDING GAS COMPARISON

Items

Shielding Gas

RemarksArgon, Ar Mix (Ag +

CO2)

Carbon Dioxide,

CO2

Quality

Spatter Low Medium High• Post weld cleaning frequency is high as spatter produced high

Weld Penetration Low Medium High

Arc Stability High Medium Low • Weld bead weave level

Power Consumptio

nArc Energy Low Medium High

• For CO2, high current setting required to get good quality result (arc stability)

Cost Cost / Cylinder High Medium Low

WELD PENETRATION PROFILE SHIELDING GAS MATRIX

CO2 100%

ARC STABILITY

Ar 80%, CO2 20%

Ar 100%

Less Stable

More Stable

Note : 1. Mix Argon & CO2 that currently used at Body shop is 80% Argon & 20% CO2 2. Argon is use for ‘fillet’ weld (ferrous metal)