Welding deformation control of aluminum alloy connection framework

Taking aluminum alloy connection framework as the product object,whose welding deformation control was researched. Welding deformation and weld quality of connection framework were controlled by methods of optimization of matching welding components,prediction of welding deformation,optimal design of welding fixture,reservation of welding allowance in parts and process control of post weld heat treatment. Finally,the difference of diagonal length of the upper framework and the bottom framework was no more than 3 mm,and the flatness of mounting surface of upper framework and bottom framework did not exceed 1.3 mm. Weld quality of connection framework fulfilled the requirement of level II in QJ 2698 A—2011 standard.