Abstract

A bimetallic product is the result of the manufacturing process in the form of unification of two materials that have different characteristics so as to obtain a product that has two different properties to be able to meet the specific technical demands as needed. Bimetallic products can be used in for punch and dies for manufacturing tooling. In the manufacture of the dies, hard surfaces and strong inner surfaces are required, thus often applying surface hardening processes to obtain both properties. The process of making and repairing this tool is by applying bimetallic system with spot welding. The basic part is made of nodular cast iron, while the surface is made of white cast iron. By applying electrical current for specific exposure time, a bonding area is built at the interface of both materials. This might consist of fusion and diffusion area. For the thickness of 3mm for each of both materials, electrical current of 40A and exposure time of 15 seconds results a joint interface without any crack and acceptable metallurgical bonding. Testing and analysis of the results have been conducted through microstructure analysis and energy dispersive spectrometry. The results of this study can be applied further on the manufacture of all technical products that require the fusion of two different material properties

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