连续驱动摩擦焊制备钛合金管件

Preparation of titanium alloy pipe fittings by continuous driven friction welding

采用连续驱动摩擦焊制备了Ti6246钛合金、TA2纯钛管材及TC4钛合金盲孔管,分析了焊接工艺参数对飞边形貌的影响,着重分析了焊接接头在热处理条件下的组织特征与力学性能。研究结果表明,在该研究试验的焊接工艺参数范围内,焊接工艺参数对焊接接头的性能影响很小;Ti6246管材及TA2管材的摩擦焊系数可达0.99;摩擦焊可以破碎焊合区组织,焊合区组织明显比母材细小;摩擦焊后TC4盲孔管焊合区的组织类型发生改变,从魏氏体组织变为网篮组织,抗拉强度降低60 MPa,但焊接系数仍可达0.94,塑性和韧性优于母材。

Ti6246 titanium alloy,TA2 pure titanium pipe and TC4 titanium alloy blind-hole pipe were prepared by continuous driven friction welding.The influence of welding parameters on the macro-appearance of welded joints,especially on the microstructure and mechanical properties of welded joints under the condition of heat treatment,was analyzed.The results showed that welding parameters had little influence on performance of welded joints within the range of welding parameters in the study.Welding coefficients of Ti6246 and TA2 pipes could reach 0.99.Friction welding could break microstructure of weld zone,which made microstructure of weld zone obviously fine than that of the base material.After friction welding,microstructure of weld zone in TC4 blind-hole pipe changed from widmanstatten to basket microstructure.The tensile strength was reduced by about 60 MPa,but the welding coefficient was still 0.94,and the plasticity and toughness were better than that of the base metal.