Optimization of Welding Process Parameters for Pressure Vessel

• Main Authors: Wen-Chung Lin, 林文忠
• Other Authors: Julian Jeng-Lin Lin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/54456664768251465447

碩士 === 東南科技大學 === 防災科技研究所 === 98 === Pressure vessel is considered as one of the dangerous equipment by Taiwan's Labor Safety and Health Law. The dangerous equipment will cause explosion to endangering workers and the public safety if manufactured or used inappropriately. Submerged Arc Welding (SAW) is commonly used in pressure vessel manufacturing. The welding quality will affect greatly to the make use safety of pressure vessel. Taguchi method is one of the most useful tools in experimental design. The method that has been widely used in occasions like less numbers of experiments can handle only single performance characteristic problems. The objective of this paper is to search the optimal welding parameters of SAW that is the most commonly used in the manufacture of pressure vessel by the Taguchi method with Grey relational analysis. The welding parameters (Stick-out, Welding current, Welding voltage, Travel speed) are optimized with considerations of the multiple response performance characteristics (the fusion of root, the face width of weld pool, and the undercut of weld pool).First, the Taguchi’s orthogonal array method which adapts to design an efficient experiment is used to plan the SAW process experiment and welding parameters in layout to reduce the experiment times in this study. In the meantime, the Grey relational grade is also used to find the optimal SAW parameters with the multiple response performance characteristics. The result of the experiment discovered that grey relational grade with the multiple performance characteristics increased from 0.6247 to 0.8042.The improvement percentage of the Grey relational grade is 28.7% that also increased the quality and the safety of pressure vessel. In the future, the dangerous equipment ensures the security of use from the manufacture source. Keywords：Optimization, Taguchi method, Gray relational analysis, submerged arc welding, SAW, Multiple performance characteristics, Dangerous equipment, Pressure vessel