In the current research work, austenitic stainless steel 304L of 1.4-mm thin sheet has been butt welded using TIG welding process. The influence of welding current in TIG welding of 304L stainless steel on temperature distribution, microstructure and mechanical properties of the welded joint has been investigated. The microstructure and mechanical properties of TIG welded specimens at varying welding current (20–120A) and constant welding speed and voltage have been explored. The influence of welding current on the weld zone temperature variation was investigated. The microstructures of the FZ, HAZ and base metal have been studied and compared at varying welding current. The mechanical properties such as micro-hardness, bending stress and tensile strength of the welded joints at varying welding current have also been investigated. The phases of the FZ were also studied by XRD analysis. Tensile test of welded specimens and parent metal has been carried out for measuring UTS and percentage elongation. Surface morphology for the fractured samples during tensile test has also been examined.

在目前的研究工作中，采用TIG焊接工艺对1.4mm薄板奥氏体不锈钢304L进行了对接焊。研究了304L不锈钢TIG焊焊接电流对焊接接头温度分布、组织和力学性能的影响。已经探索了在不同焊接电流 (20-120A) 和恒定焊接速度和电压下 TIG 焊接试样的微观结构和机械性能。研究了焊接电流对焊区温度变化的影响。FZ、HAZ 和母材的微观结构已经在不同的焊接电流下进行了研究和比较。还研究了不同焊接电流下焊接接头的显微硬度、弯曲应力和拉伸强度等机械性能。还通过 XRD 分析研究了 FZ 的相。已进行焊接试样和母材的拉伸试验以测量 UTS 和百分比伸长率。还检查了拉伸试验期间断裂样品的表面形态。