Improvement of Tensile Strength of 1018 Mild Steel Welded Joints Produced Under the Influence of Electrode Vibration
Bade Venkata Suresh1, P Srinivasa Rao2, P Govinda Rao3

1Bade Venkata Suresh, Ph.D Scholar, Department of Mechanical Engineering Centurion University of Technology and Management, Paralakhemundi, Odisha, India. Assistant Professor, Department of Mechanical Engineering, GMRIT Rajam, (Andhra Pradesh), India.
2Dr. P Srinivasa Rao,Professor, Department of Mechanical Engineering, Centurion University of Technology and Management, Paralakhemundi, Odisha, India.
3Dr. P Govinda Rao, Professor, Department. of Mechanical Engineering Swamy Vivekananda Engineering College, Bobbili. (Andhra Pradesh) ,India.

Manuscript received on 02 June 2019 | Revised Manuscript received on 10 June 2019 | Manuscript published on 30 June 2019 | PP: 1219-1222 | Volume-8 Issue-8, June 2019 | Retrieval Number: H6934068819/19©BEIESP
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Abstract: In recent years, welding has gained its supremacy in the field of production. It is vastly used in almost all the production applications. There are many defects in welding process. of which, residual stresses have become a serious matter of concern. Post weld heat treatment methods were adopted to overcome the defects. one of the methods adopted was to introduce mechanical excitations into the welding. Earlier, the weld pool is excited by vibrating the workpieces. But this method cannot be used at all the places as the equipment cannot be moved to all the places and the weld pieces can be welded. As the process became complex in some cases further improvement was made and a new type of methodology is induced by vibrating the electrode with the help of electric motor. Due to the excitations, weld pool refinement and grain refinement takes place. The specimens were welded with varying frequencies and voltages and tested to identify the change in mechanical properties with respect to vibration frequencies. The specimens were prepared according to ASTM standards and tested for tensile strength. After studying the results, it is observed that there is a betterment in the mechanical properties due to the weld pool refinement. The refinement of weld bead is a result of formation of very small nuclei in large numbers and making the grain structure very fine. It is observed that there is an improvement in Ultimate Tensile Strength up to 14.16%. The peak values in properties is observed at a frequency of 4450Hz.
Keyword: Welding technology, Vibrations, Weld pool Refinement.
Scope of the Article: Welding Technology.