Metal member-welded structure and method of manufacturing metal member-welded structure

Patent metadata

Field	Value
Publication number	US-11745290-B2
Application number	US-201917272912-A
Country	US
Kind code	B2
Filing date	Jul 24, 2019
Priority date	Sep 3, 2018
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A metal member-welded structure includes: 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. The Cu member includes a Cu-based material containing Cu as a main component. The Al member includes an Al-based material containing Al as a main component and a plating layer that covers a side of the Al-based material, the side 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. The sea portion has a eutectic structure having: a phase of an intermetallic compound of Cu and Al; and a phase of pure Al.

First claim

The invention claimed is:

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.

2. The metal member-welded structure according to claim 1 , wherein the sea-island structure includes a dense region and a coarse region, wherein
a size of the island portions in the dense region is smaller than a size of the island portions in the coarse region, and
a distance between the island portions in the dense region is smaller than a distance between the island portions in the coarse region,
the dense region is provided on a side close to the surface of the Cu member, and
the coarse region is provided on a side opposite to the surface of the Cu member.

3. The metal member-welded structure according to claim 1 , wherein the sea portion has a thickness of 5 μm or less.

4. The metal member-welded structure according to claim 1 , wherein a distance between the island portions is 10 μm or less.

5. The metal member-welded structure according to claim 1 , wherein the island portions each have a size of 1 μm 2 or more and 20 μm 2 or less.

6. The metal member-welded structure according to claim 1 , wherein the sea-island structure has a thickness of 3 μm or more.

7. The metal member-welded structure according to claim 1 , wherein the Al-based material contains, as an additional element, one or more elements selected from: 1 mass % or more and 17 mass % or less of Si; 0.05 mass % or more and 2.5 mass % or less of Fe; 0.05 mass % or more and 2.5 mass % or less of Mn; and 0.1 mass % or more and 1.0 mass % or less of Mg.

8. The metal member-welded structure according to claim 1 , wherein the plating layer has a single-layer structure of an Ni plating layer.

9. The metal member-welded structure according to claim 1 , wherein the plating layer has a stack structure formed by sequentially stacking an Ni plating layer and an Sn plating layer from an Al-based material side.

10. The metal member-welded structure according to claim 1 , wherein the Cu member includes a plating layer that covers a surface of the Cu-based material.

11. The metal member-welded structure according to claim 1 , wherein the welded portion penetrates through the Cu member.

Assignees

• Sumitomo Electric Industries
• Autonetworks Technologies Ltd
• Sumitomo Wiring Systems
• Sumitomo Electrical Ind Ltd

Inventors

• Sugimura Koki
• Kuwabara Tetsuya
• Goto Kazuhiro
• Hirai Hiroki
• Tanaka Tetsuji
• Ono Junichi
• Otsuka Takuji
• Miyamoto Kenji
• Nakayama Osamu
• Hamada Kazuaki
• Washio Kazuhiro

Classifications

• B23K26/323 Primary

  involving parts made of dissimilar metallic material · CPC title

• B23K26/244

  Overlap seam welding · CPC title

• B23K26/60

  Preliminary treatment · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title