|Metals||Gases %||Uses and results|
|Good transfer, stable arc, little spatter, Removes oxides
Hot arc – 3/8” to 3/4” (10mm to 19mm) thickness, Remove oxides. Hot arc, less porosity, removes oxides – 1/2” to 1” (13mm to 25mm) Hotter, more gas; 1/2” (13mm) and up. Removes oxides.
Hotter, less porosity, removes oxides.
|Preferred. Good wetting, hot. For thinner materials.|
Ar-2 O2 Ar-5 O2
|Short circuiting arc: high quality, low current, out-of-possition, medium spatter
Globular arc: fast, cheap, spattery, deep penetration.
Fast, stable, good bead shape, little undercut, fluid weld pool. Short circuiting arc: fast, no melt-throgh, little distortion and spatter. Short circuiting arc: deep penetration, low spatter.
|Low-alloy steel||Ar-2 O2||Removes oxides, eliminates undercut, good properties.|
|Short circuiting arc: stable arc, good wetting and bead contour, little spatter. Good impacts.
Short circuiting arc: same except low impact.
|Stainless steel||Ar-1 O2 Ar-5 O2
90He-7 1/2 Ar-2
|No undercutting. Stable arc, fluid weld, good shape. More stable arc.
Short circuiting arc: small heat-affected zone, no undercut, little warping
|Nickel, monel||Ar||Good wetting – decreases fluidity.|
|Inconel||Ar-He||Stable arc on thinner material.|