Argon / Helium / Oxygen Mix
Overview
Just as a helium addition to argon increases the arc energy when welding non-ferrous materials, so does a helium addition to argon-oxygen affect the arc with the GMAW process on ferrous materials. Ar-He-O2mixtures have been used occasionally for spray arc welding and surfacing low alloy and stainless steels to improve puddle fluidity and bead shape and reduce porosity.