Mathematical Model for Prediction and Optimization of Weld Bead Geometry in All-Position Automatic Welding of Pipes

• Main Authors: Baoyi Liao, Yonghua Shi, Yanxin Cui, Shuwan Cui, Zexin Jiang, Yaoyong Yi
• Format: Article
• Language: English
• Published: MDPI AG 2018-09-01
• Series: Metals
• Subjects: all-position automatic tungsten inert gas (TIG) welding; optimal welding parameters; response surface method (RSM); lap joint; weld bead geometry
• Online Access: http://www.mdpi.com/2075-4701/8/10/756
• ISSN: 2075-4701

In this study all-position automatic tungsten inert gas (TIG) welding was exploited to enhance quality and efficiency in the welding of copper-nickel alloy pipes. The mathematical models of all-position automatic TIG weld bead shapes were conducted by the response surface method (RSM) on the foundation of central composition design (CCD). The statistical models were verified for their significance and adequacy by analysis of variance (ANOVA). In addition, the influences of welding peak current, welding velocity, welding duty ratio, and welding position on weld bead geometry were investigated. Finally, optimal welding parameters at the welding positions of 0° to 180° were determined by using RSM.