拡散接合に関する研究(第 4 報) : 銅とアルミニウムとの拡散接合(<特集>溶接金属の水素量)

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It is generally acknowledged that the ductile welded joint of copper to aluminum is difficult to be made by fusion welding because of forming intermetallic compounds. This paper gives the result of research in the application of diffusion welding for joining copper to aluminum, and describes about the influences of basic welding process parameters, such as pressure, temperature and time, upon the weldability and intermetallic compounds. Besides the application of the insert metal (only pure metal) is studied. The following results were obtained. 1. The diffusion welded joint of copper to aluminum without the insergt metal is sound under the proper welding condition, and this joint strength is coincident with one of similar aluminum. But intermetallic compounds, such as Al_2Cu and Al_4Cu_9,form along the welding interface at higher temperature and in longer time than the proper welding condition. The joint strength decreases, when the thickness of intermetallic compounds increases more than about 10μ. The relation between welding time (t sec) and temperature (T°K) free from embritttling due to intermetallic compounds is t<8×(10)^<-5> exp (25000/RT). 2. In diffusion welding with the insert metal, it is difficult to find out insert metals which accomplish the sound welded joint without embrittling entirely. But silver is suitable as the insert metal that restrain the embrittling of welded joint. And the range of the proper welding process parameteres becomes broader with suitable thickness of the insert metal. 3. It is effective, according to circumstances, to utilize the eutectic reaction between the insert metal and base metal. Silver and zinc are suitable for this purpose, but welding process parameters must be carefully controlled to supress intermetallic compounds.
1976-07-05

拡散接合に関する研究(第 4 報) : 銅とアルミニウムとの拡散接合(<特集>溶接金属の水素量)

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