| 摘要 |
PURPOSE:To prevent generation of the blowhole, and to reduce the burn through of the bead. CONSTITUTION:The thickness of an upper body U and a lower body L which are covered with the covering material having the melting point which is lower than that of the base metal, and the boiling point which is higher than the melting point of the base metal is measured at a plurality of points, the height of a spacer 15 is determined from the range of fluctuation of the sheet thickness at the respective points and the tolerance, the lapped flanges of the upper body U and the lower body L are held by a lower receiving jig 1 and an upper pressing jig 8 with the space between the prescribed clearance and the condition where the prescribed light pressure is applied, and the flanges are welded by a laser beam welding machine 17. Generation of the evaporated gas of the covering material is reduced, and the generated gas is discharged from the clearance between the flanges to prevent generation of the blowhole. The clearance is small from the relationship with the flange thickness, and the burn through of the bead is small. |
