Diffusion Welding of Copper to Nickel

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One of the important characteristic features of diffusion welding is that it offers the possibility of welding dissimilar joints. For this reason, we, the authors, have been conducting a series of experiments in an effort to examine the weldability of dissimilar joints by diffusion welding. In this report, we take up dissimilar joints of copper to nickel which constitute a homogeneous solid solution and analyze their weldability. To begin with, we conducted an experiment on the combination of the electrolytic copper and nickel. As a result of our study on the relations between the tensile strength and the welding temperature, we found that there exists the maximum value in the tensile strength at the welding temperature of approximately 600℃. Subsequently, we made a microscopic observation of the longitudinal section of the weld zone with the result that precipitation was discovered to have formed along the weld line when temperature was high (700-800℃). On the other hand, we welded coppers with different oxygen contents to nickel and found that the tensile strength did not decrease in an oxygen-free copper even if the welding temperature was raised above 600℃. Base metal fracture was observed in copper. It was further disclosed that the lowering of tensile strength in electrolytic copper at welding temperatures above 600℃, as shown as a result of E.P.M.A. analysis, had something to do with the oxygen in the copper. So in the copper-nickel diffusion welding, the oxygen content in the copper was found to be a vital determining factor.
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Diffusion Welding of Copper to Nickel

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