The Influence of Shield Gas Compositions on the Arc Temperature in Gas-Shielded Metal-Arc Welding

Abstract

The influence of shield gas compositions in argon-nitrogen, argon-oxygen, argon-carbon dioxide and argon-hydrogen systems on the arc temperature was studied by means of the spectral line intensity method.
The findings in this work are as follows:
1) The arc temperature increases slightly with an increase of welding current.
2) The arc temperature does not undergo a noticeable change with arc voltage.
3) The arc temperature increases with an increase in nitrogen, oxygen, carbon dioxide and hydrogen additions.
The arc temperature in argon-hydrogen gas mixtures is highest, and the one in argon-carbon dioxide gas mixtures is lowest.
4) The arc temperature seems to be influenced by electrode materials.