Weld Fumes in High Pressure MIG Welding

Abstract

The increase of the weld fumes was one of the problems in arc welding under high pressure as an underwater welding.
The fume generation phenomena in MIG welding under high pressure were studied and the formula to estimate the fume generation was proposed. It was shown that the fume generation was closely connected with the arc power which increased with increasing of pressure. Therefore the selection of low arc voltage and low current condition such as short circuiting arc welding was important to decrease the fume in high pressure.
The welding in DCEN, especially in high current condition was also recomended because the fume was decreased with increasing of pressure and the bead shape was similar to that of DCEP in high pressure.