Joining with metal powder and a new process of alloying by electromagnetic energy
- Univ. of the Ryukyus, Okinawa (Japan). Faculty of Engineering
- Osaka Univ. (Japan). Welding Research Inst.
- Industrial Research Center of the Okinawa Prefecture, Okinawa (Japan)
A new process of joining and yielding metal alloys have been utilized by developing a simple method consisting of two solid metal specimen bars to be joined and alloyed, filler metal powder medium between them and electromagnetic energy. Joule thermal heat was generated in the powder medium with a greater electric resistance than in the solid bars by being charged with electricity. The upward swung temperature melts the powder medium and then the medium goes rapidly into the solid bars through their both contacting surfaces. Joule thermal heat in them increases the electric resistances rise in two heated portions in the solid specimen bars, and they attain a thermal state near their melting point. The state spreads into the metals as such. The diffusion of powder metal reveals joining and alloys can be achieved by suitably choosing some experimental conditions. In this study, experiments on solid-state joining and alloying were performed under atmospheric conditions by using metal powder medium which were sandwiched in the space between the two solid materials of specimen to be joined (i.e., base metal). In the first experiment, electro-dendritic copper powder medium was interposed between the solid copper specimen bars. In the second, atomized nickel powder medium was used between them for yielding copper-nickel metal alloys similarly as in the first experiment. In the third, solid specimen bars were not same material and had considerably different melting point with atomized nickel powder medium between them. Complete joining and alloying samples were compressed longitudinally by electrodes and current was conducted simultaneously to generate Joule thermal heat. Some fundamental data on the mechanical and metallurgical properties of the joint were also obtained. Some of metallurgical properties were studied by examining the macro and micro structures of the joint section. In particular, the experimental data obtained were compared with those of the base metals, and it was found that the strength of the joint reached approximately that of the annealed one of the solid copper specimen bar which has the lower melting point. Copper and nickel alloys were also obtained by this method.
- OSTI ID:
- 357781
- Report Number(s):
- CONF-980213--
- Country of Publication:
- United States
- Language:
- English
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