Many engineering applications are in need of high strength and low weight alloys; titanium and aluminium alloys are used in several engineering applications to reduce weight. In this study, investigate effect of environment conditions on microstructure properties of gas tungsten arc welded assisted with brazing of titanium alloy Ti-6Al-4v and aluminium alloy Al7075 has been carried out. Alloys are made joined together in natural environment and at shielded argon gas environment conditions. Mechanical properties have been arrived, tensile tests have been conducted to examine the strength of weld and results have been achieved 92.3 Mpa and 356 MPa in regular and argon environment, respectively. Vicker’s hardness value of 103.4 Hv and 183.1 Hv has been attained in respective environment condition. Fatigue properties have been elevated and fracture surface of the specimens analyzed in respective mechanisms. Welding speed, arc voltage and welding current parameters are considered to join the dissimilar alloys in both environments and identified the most influencing parameters. SEM and XRD techniques have been used to weigh up the microstructures of weld interface. The outcomes confirmed that argon gas, as a joining environment, has a substantial blow on properties of mechanical and microstructure of the weld joint.

中文翻译：

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环境对钛和铝合金接头钨极氩弧焊组织性能的影响

许多工程应用需要高强度和低重量的合金。钛和铝合金用于多种工程应用中以减轻重量。本研究研究了环境条件对钛合金Ti-6Al-4v和铝合金Al7075钎焊辅助钨极气体保护焊接组织性能的影响。合金是在自然环境中和氩气保护环境下连接在一起的。达到了机械性能，进行了拉伸试验以检查焊接强度，在常规和氩气环境下的结果分别达到92.3 Mpa和356 MPa。在相应的环境条件下，维氏硬度分别达到103.4 Hv和183.1 Hv。疲劳性能得到提高，并以相应的机理分析了试样的断裂表面。两种环境下的焊接速度，电弧电压和焊接电流参数均被考虑为异种合金的结合，并确定了影响最大的参数。SEM和XRD技术已被用来衡量焊接界面的微观结构。结果证实，氩气作为连接环境对焊接接头的机械性能和微观结构有重大影响。