CPC B23K 26/323 (2015.10) [B23K 26/244 (2015.10); B23K 26/60 (2015.10); C22C 21/00 (2013.01); C22C 21/02 (2013.01); B23K 2103/10 (2018.08); B23K 2103/12 (2018.08)] | 11 Claims |
1. A metal member-welded structure comprising:
a Cu member;
an Al member; and
a welded portion formed by melting and solidifying each of materials of the Cu member and the Al member, wherein
the Cu member includes a Cu-based material,
the Al member includes an Al-based material and a plating layer that covers a surface of the Al-based material, the surface being close to a surface of the Cu member,
the welded portion includes a sea-island structure in a vicinity of the surface of the Cu member,
the sea-island structure includes
a plurality of island portions containing pure Al, and
a sea portion interposed among the island portions, and
the sea portion has a eutectic structure having
a phase of an intermetallic compound of Cu and Al, and
a phase of pure Al.
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