FINISHING METHOD OF WELDED JOINT IN BOX MAKING STAGE

摘要

PURPOSE:To finish smoothly a welded joint without damaging a box body by bending a metallic sheet to form the outside shape of the box body, welding the joint and pressing the joint with a stationary block and a movable block. CONSTITUTION:A stationary block 4 of a lower die formed with a right-angled triangular projection is attached to an arm 1 projected to the body of a press machine. A movable block 5 of an upper die formed with a right-angled triangular recess is vertically movably attached in the position above the block 4. While the block 4 is held pressed to the welded joint 3 part of a box body 2, the block 5 is vertically moved to press the joint 3 part between both blocks 4 and 5 and the box body 2 is intermittently fed during this time to finish smoothly the welded wave pattern of the joint 3. The strength of the joint 3 is increased by such pressing and the defective weld is easily cracked in the stage of pressing and is thus easily discovered.