A Study of Solid-State Welding with Metal Powder Medium by Joule Thermal Heat

随着焊接在许多生产过程中的应用需求的增加，从小零件到重型机器和结构，如大规模集成电路，大型桥梁，船舶，海洋和/或空间设备，电阻焊（即点焊）已经变得有用，并以其技术简单和经济优势提供了各种生产过程。电阻压焊在理论和实验上得到了广泛的研究。有些研究是在一对固体试样之间使用金属粉末介质和薄金属板等材料。在常压条件下进行了基本数据的固态焊接试验研究，并对实验结果进行了检验，该方法采用金属粉末介质填充在试样棒的两个主体（即母材）之间的空间中，纵向压缩并同时通电产生高温热。实验研究的主要目的是为研究焊接的力学和冶金性能获得基础数据。并与母材进行了拉伸、冲击、U形弯曲等试验数据的比较，并用显微镜和扫描电镜对其进行了宏观和微观组织观察。本研究使用的材料为纯铜圆柱棒和固体试样的铝棒，粉末介质为200目电枝晶型铜粉、150目铝粉和150目镍粉。通过观察焊缝断面的宏观组织和微观组织以及拉伸断口的断口形貌，研究了部分力学性能和金相性能。特别是，将得到的实验数据与母材棒材的实验数据进行了比较，发现接头的强度接近母材的强度。少

With increasing demand of applications of welding into many processes of production from even small parts to heavy duty machines and constructions, such as LSI circuits, huge bridges, ships, ocean and/or space equipments, electrical resistance welding (i. e., Spot welding) has become useful, and provides various processes of the production with its technological simplicity and economical advantage.The resistance pressure welding has been widely studied theoretically and experimentally. Some studies are using material such as metal powder media and thin sheet metals between a pair of solid specimens.A tentative experimental study on solid-state welding was performed under atmospheric conditions for basic data and the results were examined to see if the method was applicable, by using metal powder medium which was filled in the space between the two main bodies of specimen bars (i. e., base metal), and was compressed longitu dinally and current was conducted simultaneously to generate Jo … More ule thermal heat. The principal objective of the experimental study was to obtain basic data for investigation of the mechanical and metallurgical properties of the welding.The authors reported that the experimental data obtained were compared with those of the base metal bars, in terms of the tensile, impact, U shape bending tests, the macro and micro structural observation was also made by microscopes and SEM.The material used in this study was pure copper cylindrical bars and aluminum bars for solid specimens and the powder medium were electro-dendritic type copper powder of 200 mesh, aluminum powder of 150 mesh and nickel powder of 150 mesh. Some of the mechanical and metallurgical properties were studied by examining the macro and micro structures of the weld joint section and the fractograph of the tensile fracture. In particular, the experimental data obtained were compared with those of the base metal bars, and it was found that the strength of the joint reached approximately that of the base metal. Less