Use of a protective gas for arc joining, the protective gas comprising Argon, Helium and Oxygen and/or Carbon dioxide

摘要

The protective- or shielding-gas used, comprises 25-30 vol% helium with 0.5 - 0.9 vol% of carbon dioxide, oxygen or both; the remainder is argon. The workpiece has a thickness of 3 mm at most, being thin sheet metal. The gas is a low-reactivity, multi-purpose gas for arc welding, used to make joins by gas-shielded welding. It is alternatively used for gas-shielded soldering with an alloy workpiece and a melting electrode. Slightly-differing, alternative gas compositions are cited in accordance with the above principles.