This report illustrates the comparative experiments of tungsten-arc-argon atmosphere welding and oxyacetylene welding on the weldability and corrosion resistance of aluminium alloys in the part of experiments already accomplished. The remained part will be reported in another chance.
This includes two kinds of experiments as follows:-
1. The weldability of the plates of 52S, 56S, 0.5% Mg-Al alloy, A51S, 17S with each thickness of 1.6, 3.2, and 6.3mm are as follows: -The weldability were estimated by the tests of their tensile strength, elongation and thermal influence, produced to the plates butt-welded by means of tungsten-arc-argon atmosphere and oxyacetylene flame.
The results show the order of weldability as follows: -0.5% Mg-Al alloy, 52S, 56S, A51S, and 17S. And the more the thickness of sheets and plates, the less the weldability. And tungsten-arc-argon atmosphere welding was superior to oxyacetylene welding in this test, especially against thicker plates.
2. The corrosion resistance of the plates, butt-welded by means of tungsten-arc-argon atmosphere and oxyacetylene flame, of 61S, 52S, 53S, 63S, A51, AW10, 56S, Lloyd heat treatable alloy, which were made from the base metal of 99.7%Al, and 99.7% pure Al and 99.3% pure Al with each thickness of 1.6mm were as follows. The corrosion tests were examined by the decrease of tensile strength of the welded plates which were immersed as long as a year in the solution containing 6% table salt and 0.3% hydrogen peroxide.
The result did not show any difference in respect with the method of welding. We suppose this fact is due to that this test was applied on the butt welded pieces and therefore corrosion flux was removed from its surface. And we are now ensuring the corrosion testing on the crossweld of these alloys. The order of corrosion resistance of the alloys were as follows: -99.7%Al, 52S, 63S, 99.3%Al, 53S, Lloyd heat treatable alloy, 56S, A51S, AW10 and 61S.
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