To develop a technology to allow easy cladding of titanium sheets on steel structures at the work site, this article describes the application of seam welding for joining of 0.5 mm thick titanium and mild steel sheets, with the aid of a Cu-base amorphous solder insert metal, and an investigation of the weldability obtained. The results obtained may be summarised as follows. During direct seam welding without an insert metal, FeTi and Fe_2 Ti intermetallic compounds are formed in welds, which easily peel off. During seam welding with an insert metal after the surfaces of the titanium and mild steel sheets are polished with No. 600 emery paper, insert metal components are mostly expelled outside the weld under the applied pres sure of the upper and lower rotating electrodes. After the surfaces of the titanium and mild steel sheets are polished with No. 80 emery paper, insert metal components, depending on welding conditions, are retained in the depressions of polishing marks.
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