Repair of Structural Steel Surface Groove by Using Spray Welding and Diffusion Welding Methods

To improve mechanical properties and increasing useful life of metal parts, different methods of welding are used for repairing surface crack of metal parts. In this research, performance of flame welding by spraying pure iron powder and diffusion welding of pure iron powder through magnetic induction evaluated for repairing surface cracks of structural steel. First, eight specimens prepared including two control specimen and other six specimens grooved specimens in depth of 1mm and in length of 12.5mm and groove width in the sizes of 0.5, 0.75 and 1mm. then, two methods of repairing had done. Results showed that after repairing surface groove by using flame welding method and diffusion welding method, tensile strength of the repaired specimens reached to the tensile strength of control specimen with the margin of 2.5% and 7.5%, respectively. Therefore, flame welding method was safer than diffusion welding method for repairing surface groove of structural steel by using pure iron powder.