| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser weld fitting in which fitting strength can be secured even in a case that stresses are applied from various directions like shearing stress testing, rather than stress from one direction and even in a case of the superimposing fitting for laser welding of high strength steel sheets to each other, and its manufacturing method.SOLUTION: After two weld beads 3, 4 parallel to each other are fabricated in the sheet width direction at the superimposing part of two steel sheets 1, 2 of high strength the tensile strength of which is 780 MPa or more so that a joint width L becomes 1.5 to 10.0 mm, furthermore, a third weld bead 5 or third and fourth weld beads 5, 6 parallel with these two weld beads 3, 4 are fabricated between these two weld beads so that both the center-to-center dimensions d1, d2 between the two initial weld beads 3, 4 and an adjacent weld bead to them respectively become 0.2 to 2.0 mm. Here, the joint width L means the dimension between both outside end surfaces of the two initial weld beads 3, 4 at the joint surface between the two steel sheets 1, 2.</p> |
