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Effect of Burn-off Length on the Properties of Friction Welded Dissimilar Steel Bars
Muralimohan Cheepu,제우성 대한용접접합학회 2019 대한용접·접합학회지 Vol.37 No.1
Friction welding is one of the solid state welding process and it is very popular method to join cylindrical components of similar and dissimilar metals. It is most economical and high productive method for various applications of aerospace, automotive and chemical industries. The joining of austenitic stainless steels using fusion welding methods associated with many problems such as solidification cracks and grain growth. To alleviate these problems, friction welding method has been used for joining of austenitic stainless steel to carbon steel. The process parameters such as burn-off length is one of the significant welding condition to govern the heat generation and coefficient of friction during welding. Burn-off length of 1 mm to 6 mm was selected to investigate its effect on mechanical properties and weld interface characteristics. An optical, scanning electron microscope and electron backscattered diffraction analyses were used to characterize the weld interface properties. The mechanical properties of the joints were evaluated by using hardness, tensile and fatigue tests. It is observed that, strength of the joints were increased with increasing of burn-off length up to optimum value of 4 mm and starts to decrease on further increasing of burn-off length.