SHEAR STRENGTH ENHANCEMENT IN VIBRATORY LAP WELDED JOINTS

Manufacturing processes inevitably induce a state of residual stress into materials and products. This can pose potential problems, in terms of dimensional stability, Structural integrity and reduced fatigue life. The conventional way to relieve the residual stresses is post-weld heat treatment, which is an effective process, but it suffers from several disadvantages: the cost of treatment in terms of equipment and energy is high. Hence a new approach is needed to overcome the draw backs encountered by the conventional stress relieving techniques. As an extension to the existing methods for better strength achievability vibratory welding technique is introduced. The present experiment is intended to analyze the effect shear stress on the lap welded mild steel plates of IS 2062 grade-B, which are welded during vibration with variations of current that is at different amplitudes and accelerations. And it is identified that the shear strength is increasing while the welding process is done by giving vibrations to the work piece.