拡散溶接における接合界面の電気抵抗の集中抵抗による解析

• 圓城敏男

  大阪大学溶接工学研究所

• 池内 建二

  大阪大学溶接工学研究所

• 秋川 尚史

  大阪大学大学院 (現)川崎重工(株)社

• 岡崎 司

  大阪大学大学院 (現)日本油脂(株)社

書誌事項

タイトル別名

• Analysis of Electric Resistance of Bond Interface in Diffusion Welding by Constriction Resistance

抄録

New equations giving constriction resistance R_C as a function of area S_M and number density n of true contact spots have been obtained from a model experiment, and applied to the analysis of the electric resistance of the bond interface ΔR for the diffusion-welded joint of titanium. The new equations obtainedare described as [numerical formula] for (S_M/S)<1/4,and [nimerical formula] for (S_M/S)>1/4,where ρ is the resistivity of base metal and S the apparent contact area. It can be seen from these equations that parameter A=(ΔR・S/ρ) depends only on (S_M/S) and n, if ΔR=R_C. Parameter A measured at temperatures from 77 K to room temperature for joints of titanium, however, decreased with a rise in the temperature of measurement, and its temperature dependence became less pronounced with the increase in welding temperature and time. On the other hand, area S_M and density n were estimated from fractured surfaces of joints on the assumption that spots where grooves caused by machining of the faying surface were annihilated corresponded to true contact spots. Parameter A estimated from S_M and n thus obtained using eqs.(1) and (2) was significantly smaller than that measured at 77 K and rather in good agreement with that measured at room temperature. This result indicates that not all the true contact spots observed on fractured surfaces corresponded to completely bonded spots having electrical properties identical with those of the base metal. The dependence of A on the temperature of measurement can be accounted for by a model that the bond interface consists of three characteristic spots : unbonded spot, completely bonded spot and incompletely bonded spot containing inclusions such as oxide films.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 5 193-, 1987

  社団法人溶接学会

キーワード

• Diffusion Welding
• Electric Resistance
• Constriction Resistance
• Titanium
• Tensile Strength

詳細情報

• CRID: 1573387452183042304
• NII論文ID: 110003422794
• NII書誌ID: AN1005067X
• ISSN: 02884771
• 本文言語コード: ja
• データソース種別:
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