Abstract There is a renewed interest to utilize the advantages of hot wire gas tungsten arc welding (HWGTAW) process in industrial area. This manuscript reports HWGTAW of pure nickel tubes of 4 mm thickness. Design of experiment (DoE) approach was adopted to bring down the number of the joints. Welding plan was executed according to 3 factors, 5 levels central composite design (CCD). Electrode current, wire feed rate and hot wire current were considered as process parameters and varied in 5 levels. DoE approach allowed to develop an empirical relationship which was used to predict the role of process parameters on the tensile strength of joints within the chosen range. The predicted trends were correlated to the observed macrostructure and microstructure. The joint strength varied due to changes in fusion zone grain size and macroscopic level defects such as lack of penetration, incomplete fusion and lack of coalescence.

中文翻译：

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用经验关系预测热丝钨极氩弧焊纯镍管的抗拉强度及加工条件的作用

摘要 在工业领域利用热丝钨极氩弧焊（HWGTAW）工艺的优势重新引起了人们的兴趣。这份手稿报告了 4 毫米厚的纯镍管的 HWGTAW。采用实验设计（DoE）方法来减少关节的数量。焊接方案是根据3个因素，5级中央复合设计（CCD）执行的。电极电流、送丝速度和热丝电流被视为工艺参数，并在 5 个级别上变化。DoE 方法允许开发一种经验关系，用于预测工艺参数对所选范围内接头拉伸强度的作用。预测的趋势与观察到的宏观结构和微观结构相关。