Abstract
In this study, the effect of tool shoulder diameter (primary heat generating source) to the plate thickness ratio on tensile and impact toughness properties of friction stir welded high strength low alloy (HSLA) steel was investigated. A naval grade HSLA steel of 5 mm thick plates were welded with tool rotational speed of 600 rpm and welding speed of 30 mm/min using five tungsten based alloy tools having shoulder diameter varying from 20 to 30 mm. Microstructural characteristics of the weld joints were analyzed using optical microscopy along with the evaluation of tensile properties. From this investigation, it was found that the joint fabricated using a tool shoulder diameter of 25 mm (5 times the plate thickness) exhibited superior mechanical properties compared to other joints.
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