采用重复焊接的试验方法,探讨TA7合金焊缝密集交叉结构承受冲击载荷能力差,易脆性断裂的原因。由于焊接热的重复作用,接头过热区产生严重的气体污染、魏氏α组织和α’相,性能变脆,甚至引起微裂纹,导致脆性破坏。改进结构,减少焊缝交叉和焊接热的作用,是防止焊接接头的脆性,提高结构件承受冲击载荷能力的有效途径。 The test method of repeated welding was used to investigate the reason of the poor impact load capacity and brittle fracture of dense cross-section structure of TA7 alloy weld. Due to the repeated heat of welding, the overheated zone of the joint produced serious gas pollution. The Wei’s α-phase and α ’phase became brittle and even caused microcracks, resulting in brittle failure. Improve the structure and reduce the cross-weld and heat welding role is to prevent the brittleness of welded joints and improve the structure to withstand the impact load capacity of the effective way.