Welding technology by op khanna pdf download

Many research activities have been conducted on this metal joining processes which lead to the process being used in diverse field of applications. The best solution based on the mechanical, microstructural, and fracture analysis concluded that TIG welding with MS filler rod and PWHT at 600 ☌ is the optimum condition for joining SS AISI 304 with MS AISI 1020.įriction Stir Welding is a versatile metal joining process, which has been adopted to join composite materials. After conducting fracture analysis by SEM, it has been noticed the specimen becomes more ductile after PWHT.

The hardness values have decreased after PWHT which justified the achievement of higher ductility after heat treatment. This is the region where the hardness values were the smallest. The coarser grain structure was observed in the heat-affected zone (HAZ) which makes the sample susceptible to failure. Both optical and SEM micrographs showed that the amount of δferrite and martensite is higher in the as-welded situation. Destructive tests have suggested that PWHT at 630 ☌ is better for the SMAW process with both MS and SS electrodes and PWHT at 600 ☌ is more suitable for TIG welding process with both MS and SS filler rod. To explore the optimum welding process and PWHT process for this dissimilar joint, both tensile and bending tests were carried out. For post-weld heat treatment (PWHT), three distinct temperatures of 600 ☌, 630 ☌, and 650 ☌ were investigated over the welded specimens. To investigate the effect of filler material in the dissimilar welding joint, both MS and SS filler material was exercised.

In this research, the welding joint between stainless steel (SS) of grade AISI 304 and mild steel (MS) of grade AISI 1020, was accomplished by using shielded metal arc welding (SMAW) and tungsten inert gas (TIG) welding process. Joining of two materials having different physical, chemical, and thermal properties and to make the joint tough and stiff, special attention and investigation are required.

Welding technology by op khanna pdf download