Plasma arc hybrid welding method to improve joint fatigue strength of lap fillet welded joint

摘要

PPROBLEM TO BE SOLVED: To provide a welding method for improving the fatigue strength of the weld joint of a suspension component in the lap fillet welding for manufacturing automobile suspension components by combining a gas shield arc welding method for a leading pole and a plasma arc welding method for a trailing pole. PSOLUTION: The gas shield arc welding method for the leading pole 7 is combined with the plasma arc welding method for the trailing pole 8 respectively. Both of the plasma arc welding method and the gas shield arc welding method use a positive pole. Further, the interval between the electrode 7 of the gas shield arc welding method and the electrode 8 of the plasma arc welding method in the direction of a welding line is set to be 25 mm or less, and the flank angle at the toe portion of a welding bead on the lower plate side is set 135 or more, and the radius of curvature of the toe portion is set to be 0.45 mm or more. In this state, the lap fillet welding is carried out for the upper plate 2 having a thickness of 6 mm or less. PCOPYRIGHT: (C)2008,JPO&INPIT