Abstract
The results of the butt joint formation of 5 mm thickness sheets from 1420T1 and 1163T aluminium alloys in different combination are presented. It is established that the ultimate strength of the joints depends on the location of the welded alloys relative to the direction of the tool rotation during friction stir welding. It is shown that depending on the location of 1420T1 and 1163T alloys on the side of the run in or out of the tool, the maximum temperature at the edge of the tool shoulder is 385 or 410 °C, in the weld core the metal is heated to 490 °C. The stir zone (the weld metal) consists of two zones corresponding to welded alloys without stir with each other. Ultimate strength to welded joint 1420T1 and 1163T alloys is 0.65...0.73 of ultimate strength to the 1420T1 alloy
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