Effect of repetitive rework on dissimilar austenitic stainless steel pipes by using GMAW orbital welding

Tan, Huay Kean (2015) Effect of repetitive rework on dissimilar austenitic stainless steel pipes by using GMAW orbital welding. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Dissimilar metal welding is widely applied to meets the requirements of transition in mechanical properties and/or difference in working conditions. Even though AISI 304 and AISI 316L are both belong to austenitic stainless steels, but their nominal composition is slightly different. Thus, they are applied in different working environment, where AISI 316L has contact with working media, but AISI 304 does not have. On the other hand, repair welding is a method that usually employed in steel-made structural components. This method is able to return a part or component back to its normal service life if weld failures happened due to service deterioration or defects during fabrication stage. However, repetitive heat input due to repair welding will cause changes in welded structure. Therefore, the objectives of this study are to characterize the properties of as-received AISI 304 and AISI 316L austenitic stainless steel pipes, investigate the effect of repetitive repair welding on quality, microstructure, microhardness and tensile properties of welded dissimilar stainless steel pipes and suggest an optimum number of repetitions for the dissimilar stainless steel pipes repair welding process. Throughout this study, optimized parameters where arc current 133 A, arc voltage 21 V and welding speed 25 mm/min that obtained from previous researchers was used to perform the repair welding. After that, every welded dissimilar pipe was subjected to non-destructive testing and mechanical testing. In prior to mechanical testing, quality of welded pipe was checked by using liquid dye penetrant testing. Then, optical microscope was applied for macrostructural and microstructural examination. After that, microhardness testing and tensile testing were carried out by using Vickers microhardness tester and tensile tester respectively. The results revealed that quality of welding and the microstructure transformation had effect on mechanical properties of dissimilar metal weld joint.

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