Effect of repair welding on pipes with dissimilar materials

Abdul Wahid, Nadia Mazwa (2017) Effect of repair welding on pipes with dissimilar materials. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this study is to evaluate changes in the mechanical properties of stainless steel AISI 304 and carbon steel BS 1387 after first repair and to suggest an optimization of welding parameters after first repair using Taguchi Method. The welding and repair welding were conducted by metal inert gas welding (MIG). The MIG welding process was performed using AISI 308L filler metals. The specimens were welded using original weld parameter and had been repaired with different parameters of repair welding parameters, which was in the range of 150A to 170A weld current and 50 rpm to 100 rpm. Then, the set of welding parameters were designed using Minitab 16. Specimen of the base metal and different conditions of dissimilar joints were studied in terms of their tensile properties and microhardness which focused on base metals, heat affected zone (HAZ) and weld metal. Then, it had been proved that when using the low heat input, it resulted to better performance of tensile strength and microhardness when low current (150A) and high rotational speed (50 rpm) were setup. Other than that, microhardness profile which form same trend line and divided into five zones had been observed. The trend line showed that the hardness of weld metal was lower than base metal and HAZ. Then, the data were analysed by using Taguchi method to suggest an optimization welding parameters for first repair. It is also could be concluded that the rotational speed contributes the most significant factor for tensile strength, while weld current contributes the most significant factor for microhardness.

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