Aluminum Alloy Carbody Assembly Welding Process and Carbody Dimension Control Measures
According to the structural characteristics of the aluminum alloy metro carbody of a project,the article analyzes the process difficulty that the carbody dimensions partially exceed the tolerances after carbody assembly welding caused by the conventional A-type carbody welding according to the standard during the trial production of aluminum alloy carbody after change of design.By optimizing the sequence of carbody assembly welding,normalizing the welding parameters,increasing the process reverse deformation and other process measures,the problem of carbody dimensions out of tolerance after carbody assembly welding has been effectively solved,the maximum width of the lower part of the welded carbody is reduced from-7 mm to-5 mm,the width of the upper part of carbody is reduced from+2～+5 mm to-1～+2 mm and the maximum outer contour of the welded carbody is reduced from 15 mm to a 9 mm,which satisfies the dimensional requirement of welded carbody and effectively reduces the difficulty of carbody recondition in subsequent step,providing a reference for subsequent carbody assembly of similar structure.
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