Effect of the composition of the shielding gas on the properties of arc welded joints in aluminium alloys

Abstract

Results of the investigations of the effect of changes in the composition of the shielding gas on the energy parameters and the cross section of the arc column in the shielding gas are presented. It is shown that the periodic variation of the composition of the shielding gas from helium to argon is accompanied by a cyclic short-term increase in the pressure of the welding arc and also by a surge of welding current. The periodic variation of the composition of the shielding gas in the arc refines the structure of the weld metal and increases the solidification cracking resistance of aluminium alloys.

Keywords:

• arc welding
• non-fusible electrode
• protective medium
• composition of gaseous medium
• structure
• resistance

Notes

^1. Patent 2049618, 2233466, 2337797 (Russian Federation).