Abstract
Straight Tube Butt Welding is a process in which straight tubes are welded. Tubes with a 63.5 mm as outer diameter and 4 mm wall thickness are used as the base material in the following combination: Super 304H and T91. The filler material ERNiCR Fe-7A is selected based on the properties of two metals with 0.8 mm outer diameter. The study is to find out the near input parameters in gas metal arc welding of tempered martensitic steel T91 and austenitic steel super 304H with nickel-based filler wires. Trials are conducted with these alloy steel tubes by varying the input process parameters. All input parameters are taken and optimized by using Taguchi’s method analysis and their optimized values are taken for their welding. High tensile strength is obtained from their optimized values, and the specimen is tested for the tensile and micro-hardness tests of welded joints.
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