铸造2025，Vol.74Issue(10)：1392-1398,7.
激光焊接参数对变间隙TC4钛合金板焊接接头成形质量及性能的影响
Effect of Laser Welding Parameters on the Forming Quality and Performance of Variable Gap Plate Welding Joints of TC4 Titanium Alloy
摘要
Abstract
Uneven gap of TC4 titanium alloy skin plate with sheet metal forming and mechanical cutting will occur frequently after assembly.The weldment with uneven gap will produce defects such as incomplete penetration or burn-through after laser welding.In order to improve the laser welding forming quality of TC4 titanium alloy skin plate with variable gap,self-melting laser welding of TC4 titanium alloy skin plates with variable gap was carried out.The effects of linearly varying laser power and defocus on the forming quality,microstructure,and mechanical properties of the welded joints were investigated.The results indicated that solely adjusting the laser power or defocus cannot achieve a welded joint with good forming quality for variable-gap TC4 titanium alloy sheets.Considering obtaining welded joints with excellent forming quality,it is advisable to adopt welding process parameters where the laser power was varied from 1.09 kW to 1.15 kW,and the defocus distance was adjusted from+5 mm to+6 mm.With these parameters,the tensile strength of the welded joint reached 1 113.1 MPa,and the elongation was 13.3％.The microstructure of weld seam was martensitic structure.Near the fusion line,the microstructure within coarse β grains consisted of acicular martensite.The microstructure at the heat affected zone faring the bond line only showed heating traces and no structural transformation.The microhardness distribution of the joint showed a distribution pattern of weld seam＞heat affected zone＞base metal.The tensile fracture of the welded joint at room temperature was located in the base metal,with numerous ductile dimples and a few brittle tearing edges on the fracture surface.The fracture mode is a combination of ductility and brittleness.关键词
激光焊接/变间隙TC4钛合金板/成形质量/性能Key words
laser welding/TC4 titanium alloy skin plates with variable gap/forming quality/mechanical properties分类
金属材料引用本文复制引用
郑超,胡生双,姜毅,张兵宪,高晓颖,张颖云,欧阳德来..激光焊接参数对变间隙TC4钛合金板焊接接头成形质量及性能的影响[J].铸造,2025,74(10):1392-1398,7.基金项目
江西省自然科学基金项目(20242BAB25216). （20242BAB25216）
