Statistical Analysis on Weld Bead Geometry of Pulsed Current Micro-plasma Arc Welded AISI 316Ti Austenitic Stainless Steel Sheets

Abstract

Micro-plasma arc welding (MPAW) uses low amperage to join sheets, where the thickness is low, such that they can be used for manufacturing metal bellows, metal diaphragms etc. In the present work, pulsed current MPAW is used for joining 0.3 mm thick AISI 316Ti austenitic stainless steel sheets. Peak current, base current, pulse rate and pulse width are considered as input parameters and weld bead geometry parameters namely front width, back width, front height, back height are considered as output responses. Total 27 experiments are performed as per Box-Benhken design of response surface method. Weld bead geometry parameters are measured using metallurgical microscope. Empirical mathematical models are developed using statistical software (MINITAB). Analysis of variance (ANOVA) is carried out at 95% confidence level. Main and interaction effects are studied. Scatter plots are drawn to understand the variation of actual and predicted values of weld bead parameters.

Cite this Article

Ch Swetha, Siva Karuna G. Statistical Analysis on Weld Bead Geometry of Pulsed Current Micro-plasma Arc Welded AISI 316Ti Austenitic Stainless Steel Sheets. Journal of Materials & Metallurgical Engineering. 2016; 6(2): 20–37p.