Analysis of Seam Weld Strength and Micro Structural Properties of Welded Dual Phase Steel Tubes
A. Sudheer1, S. Jose2

1A. Sudheer, Research Scholar, Department of Mechanical Engineering, Faculty of Engineering and Technology, University of Kerala, (Kerala), India.
2S. Jose, Associate Professor, Department of Mechanical Engineering, T.K.M. College of Engineering, Kollam, (Kerala), India.

Manuscript received on 10 August 2017 | Revised Manuscript received on 18 August 2017 | Manuscript Published on 30 August 2017 | PP: 172-176 | Volume-6 Issue-6, August 2017 | Retrieval Number: F5160086617/17©BEIESP
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Abstract: Welded steel tubes of advanced high strength category are considered as candidate material for replacing the drive shafts in automobiles. Seam welded Dual phase steel tubes of various grades were tested to analyze their strength and compatibility to replace drive shaft in light motor vehicles. The tensional fatigue life was found to be varying for specimens with varying test conditions. In all cases, failure was found to occur at the welded region of tubes in longitudinal direction followed by circumferential branching. Failure patterns of each specimen are closely observed under SEM. Fractographs showed clear indications of crack initiation and crack propagation. Energy Dispersive Spectrometry (EDS) analysis were conducted which indicated the impurity concentrations at crack region. Micro structural analysis and hardness measurements of various specimens were carried out along the weld section which clearly showed in homogeneity between base metal and the weld section. Grain size measurements were also done for weld region and base metal.
Keywords: Welded, Compatibility, (EDS), Energy, SEM. 

Scope of the Article: RF Energy Harvesting