QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Print ISSN : 0288-4771
Behavior of Oxide Film on Intimate Contact Zone of Diffusion-Weld
Study on Surface Film on Diffusion-Welded Interface (Report 3)
Osamu OhashiKinji TanumaTakashi Kimura
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1986 Volume 4 Issue 1 Pages 53-59

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Abstract

Behavior of the oxide film on the intimate contact zone of diffusion-welded interface has been investigated with Auger electron spectroscopy, SEM and EPMA. Results obtained are summarized as follows.
1. Behavior of the oxide film on the intimate contact zone of iron, SUS304 stainless steel, copper and titanium is similar to that on the void surface of diffusion-welded interface.
2. On the diffusion-welded interface of aluminum, the oxide film is disrupted to form metallic bonds by the deformation of contacting asperities. As the oxide film of aluminum does not disappear during welding, tensile strength of welded joint is low.
3. On the intimate contact zone of diffusion-welded joints in copper, iron and SUS304 stainless steel, inclusions are formed owing to spheroidizing of the oxide film. Inclusions consist of various oxides and sulfides. The amount of inclusions decreases with a decrease in the thickness of the oxide film of welded surface and with a increase of welding time.
4. Behavior of the oxide film on diffusion-welded interface can be classified to three types as follows:
A type-The oxide film on void surface and intimate contact zone disappears during the initial stage of diffusion welding. Titanium belongs to this type.
B type-The oxide film on void surface and intimate contact zone disappears, forming inclusions owing to spheroidizing of the oxide film. The amount of inclusions decreases owing to diffusion of oxygen during welding. Copper, iron and SUS304 stainless steel belong to this type.
C type-The oxide film on diffusion-welded interface does not disappear during welding. Aluminum belongs to this type.

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