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

Abstract

2012) Effect of the composition of the shielding gas on the properties of arc welded joints in aluminium alloys, Welding International, 26:5, 384-387, b V. Chernyshev Machine Building Enterprise, Moscow, RussiaResults 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.

Effect of shielding gas parameters on weld metal thermal properties in gas metal arc welding

“…The alternating shielding gas process has been applied as a shielding gas supply method in arc welding processes; particularly for aluminium alloys [2,3,4,5,6,7,8], carbon [8,9,10] and stainless [3,11,12] steels, and narrow gap welding [13]. This shielding gas supply method has resulted in a number primary benefits being achieved, as well as several interrelated benefits when compared to conventional supply methods including a reduced edge preparation requirement, an increase in productivity, which has associated benefits including a reduction in weld induced distortion, and electrical energy and shielding gas consumption, improvements in mechanical and microstructural properties, and improvements in post weld efficiency including increased accuracy of manufacture, a reduction in rework and fewer rejected components.…”

Study of Wind Velocity Impact upon the Quality of Shielding and upon the Thermal Processes under MAG Welding

“…The outward part of the shielding gas jet is inevitably mixed with the air and only its inward part consists of 100% shielding gas (Fig. 1) [1][2][3][4][5][6]. mm Fig.…”