US 6,552,292 B1Granted

Metal welding method and metal bonding structure

AssigneeMazda Motor Corporation

InventorsSeiji Nomura, Satoshi Nanba, Yukihiro Sugimoto, Yukio Yamamoto

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Abstract

When a seat (3) (FIG. 6A) on which a wax layer (7) is formed via a melting reaction layer (5) is brought into contact with a head (2) and heated and pressed in this state, a melting reaction layer (6) forms below the wax layer (FIG. 6B). When electric current application and pressing are continued from this state, a wax which has not reacted in the wax layer (7) in the formation of the melting reaction layer (6) is discharged from between the melting reaction layers (5) and (6). When electrical current application and pressing are further continued from this state, the two melting reaction layers (5) and (6) diffuse each other. The result is that a ternary alloy bonding layer (10) containing Fe, Al, and Zn, which constitute the melting reaction layers (5) and (6) is formed between the seat (3) and the head (2) (FIG. 6D).

Claims17

Dependent claims

A metal welding method of welding a first metal member and a second metal member having a lower melting point than that of said first metal member, comprising the steps of:

a first step of depositing a third metal member having high reactivity to said first and second metal members on said first metal member via a first diffusion layer composed of said first and third metal members;
a second step of positioning said first and third metal members so that said third metal member is contacted with said second metal member;
a third step of heating and pressing said first to third metal members positioned in said second step by a welding electrode;
a fourth step of, by further continuing the heating and pressing, welding said second and third metal members via a second diffusion layer composed of said second and third metal members;
a fifth step of, by further continuing the heating and pressing, discharging said third metal member which remains unreacted during the formation of said second diffusion layer from between said first and second metal members, and contacting said first and second diffusion layer directly;
and
a sixth step of, by further continuing the heating and pressing, diffusing said first and second diffusion layer directly contacted in said fifth step and welding, by diffusion reaction caused by the continuation of the heating and pressing, said first and second metal members only by a ternary bonding layer which is composed of said first, second and third metal members.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/497,193Filed 3 Feb 2000
Priority: JP 11-06893715 Mar 1999
Granted: 22 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B23K 1/19
Soldering, e.g. brazing, or unsoldering: taking account of the properties of the materials to be soldered
B23K 11/002
Resistance welding; Severing by resistance heating: specially adapted for particular articles or work
B23K 20/16
Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating: with interposition…
B23K 20/2275
With ferrous layer: the other layer being aluminium