CPC B23K 26/21 (2015.10) [B23K 26/323 (2015.10); B23K 26/324 (2013.01); B29C 65/16 (2013.01); B32B 3/266 (2013.01); B32B 15/01 (2013.01); B32B 15/08 (2013.01); B23K 2101/006 (2018.08); B23K 2103/04 (2018.08); B32B 2250/40 (2013.01)] | 3 Claims |
1. A joint structure comprising:
a first material;
a second material including a similar metal material to the first material, the second material being weldable to the first material; and
a third material, at least a portion of which being sandwiched between the first material and the second material, the third material including a through opening portion in the sandwiched portion and including a material that is difficult to be welded to both the first material and the second material, the third material being a resin material,
the first material and the second material welded to each other via the through opening portion, wherein
the first material and the second material are welded by emitting a laser beam from a side on which the first material is disposed, under a condition in which: at least one of the first material and the second material is provided with a protrusion inserted in the through opening portion; a first gap is provided between the protrusion and an inner peripheral surface of the through opening portion; a second gap is provided between the first material and the second material, the second gap having a size depending on a plate thickness of the first material in a region corresponding to the protrusion along a plate thickness direction; and the size of the second gap is greater than or equal to 0.1 mm and less than or equal to 38% of the plate thickness of the first material in the region, and wherein
the inner peripheral surface is indirectly heated and fused by welding heat input to the protrusion by the laser beam and intimately fixed to an outer peripheral side of the protrusion.
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