ABSTRACT

The present work investigates the effects of selected welding process parameters on the output responses for the tungsten inert gas welding of two aluminum alloys: 5083-H111 and 5754-H111. The tungsten inert gas welding was performed using design of experiments followed by the optimization of process parameter through response surface methodology technique. Tungsten inert gas welding was carried out by varying current, gas flow rate, and weight percentage of scandium addition on the filler rod and tensile strength and microhardness were measured as output responses. From the analysis of variance results, it was found that the significant influencing parameter to be input current for the tungsten inert gas welding. For predicting optimal ultimate tensile strength and microhardness, desirability approach was used. The optimized process parameters were found to be input current of 170 A, gas flow rate of 11 lit/min, and weight percentage of scandium added filler rod of 0.5%. The peak tensile strength and microhardness values observed for the optimum process parameters were 236.18 MPa and 105 HV, respectively. The validation of the optimization found these values from the experiments consistent with the predicted values with marginal error. The microstructure of the base alloys and the weld zone were analyzed.

摘要

目前的工作调查了所选焊接工艺参数对两种铝合金钨极惰性气体保护焊输出响应的影响：5083-H111 和 5754-H111。钨极惰性气体保护焊采用实验设计，然后通过响应面法技术优化工艺参数。通过改变电流、气体流速和填充棒上添加钪的重量百分比来进行钨极惰性气体焊接，并测量拉伸强度和显微硬度作为输出响应。方差分析结果表明，钨极惰性气体保护焊的输入电流是影响显着的参数。为了预测最佳的极限抗拉强度和显微硬度，使用了合意性方法。优化后的工艺参数为输入电流为 170 A，气体流量为 11 升/分钟，钪添加填充棒的重量百分比为 0.5%。对于最佳工艺参数，观察到的峰值拉伸强度和显微硬度值分别为 236.18 MPa 和 105 HV。优化的验证发现这些来自实验的值与具有边际误差的预测值一致。分析了基体合金和焊接区的显微组织。优化的验证发现这些来自实验的值与具有边际误差的预测值一致。分析了基体合金和焊接区的显微组织。优化的验证发现这些来自实验的值与具有边际误差的预测值一致。分析了基体合金和焊接区的显微组织。