| 2002 №02 (03) | 2002 №02 (05) |
The Paton Welding Journal, 2002, #2, 18-22 pages
Non-consumable electrode argon-arc welding of aluminium alloys with arc oscillations
A.G. Poklyatsky, A.Ya. Ishchenko, A.A. Grinyuk, A.A. Chajka, V.E. Fedorchuk
E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.Abstract
The effect of arc oscillations occurring as a result of alternating current passing through the region of filler on the shape of penetration, hardness, structure and mechanical properties of welds in argon-arc non-consumable electrode welding aluminium alloys 1201, AMg6, 1420 and 1460 has been investigated. It is shown that the sizes of penetration of welds depend on values of current passing through the arc gap and the filler wire region, and the frequency of changing their polarities. It was established that at similar depth of penetration the width of welds and degree of weakening of welded joints produced by welding with arc oscillations are less than those in welding with a stationary arc. Intensive stirring of the molten metal and change in conditions of its solidification promote the formation of fine equiaxial dendrites, thus increasing the hardness of weld metal and its strength.
Keywords: argon-arc welding, non-consumable electrode, arc oscillation, aluminium alloys, mechanical properties, hardness, structure
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