Senthilkumar S, Manivannan S, Venkatesh R, Karthikeyan M
Department of Mechanical Engineering, Madha Engineering College, Kundrathur, Chennai, Tamilnadu, 600069, India.
Centre for Material Science, Department of Mechanical Engineering, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, 641021, India.
Heliyon. 2023 Sep 1;9(9):e19708. doi: 10.1016/j.heliyon.2023.e19708. eCollection 2023 Sep.
The Gas Tungsten Arc Welding process weld for the 4 mm thickness of the ASTM A36 steel plate with varied heat input parameters of 0.608 kJ/mm, 0.900 kJ/mm and 1.466 kJ/mm, respectively. The effect of different heat inputs on microstructure, corrosion, and mechanical characteristics of developed weld joints are examined by three zones: heat-affected zone, welded zone, and base metal zone. The optical microscopic results of weld joints illustrate that fine grain structure leads to enhance welding strength. It is revealed that the increased heat input parameter on the weld joint shows a decreased tensile strength and hardness of the weld joint. The corrosion resistance of the weld joint is evaluated by Potentio-dynamic polarization. It facilitates that the corrosion rate of the weld joint is decreased with increasing heat input, which results indicate the best and worst corrosion micrograph of the polygonal ferrite and ferrite plus polygonal ferrite. However, the weld joint prepared with 0.900 kJ/mm heat input found maximum corrosion resistance.
采用钨极气体保护电弧焊工艺对厚度为4mm的ASTM A36钢板进行焊接，热输入参数分别为0.608kJ/mm、0.900kJ/mm和1.466kJ/mm。通过热影响区、焊接区和母材区三个区域研究不同热输入对所制备焊接接头的微观结构、耐腐蚀性和力学性能的影响。焊接接头的光学显微镜结果表明，细晶粒结构有助于提高焊接强度。结果显示，焊接接头上热输入参数的增加会导致焊接接头的抗拉强度和硬度降低。通过动电位极化法评估焊接接头的耐腐蚀性。结果表明，随着热输入的增加，焊接接头的腐蚀速率降低，该结果表明多边形铁素体和铁素体加多边形铁素体的腐蚀微观图分别为最佳和最差情况。然而，热输入为0.900kJ/mm时制备的焊接接头具有最大的耐腐蚀性。
