Abstract: Corrosion proof overlaying welding was carried out on the non-clad zone of C46400-SA266 MGr. 2 clad metal plate manufactured by explosive weld method. Metallurgical structures were observed and mechanical property tests were carried out. The test results indicated that the performance of the weld by corrosion proof overlaying welding and the heat-affected zone could meet the requirements of standards associated; electrical resistivity of the weld was lower than that of the base metal; the heat-affected zone showed no sign of coarse grains; the structure of the interface of the copper-steel was even,with no brittle phase produced.