Copper And Copper Alloy Clad Steel Plate

Copper and copper alloy clad steel plate is made of copper/steel explosive composite ‚ Copper as the cladding ‚ Steel as base ‚ Its chemical composition and mechanical properties.

The Copper and copper alloy clad steel plate has the following characteristics: the clad copper is single-phase α organization ‚ During welding heating ‚ Copper is easily heated and grows to form coarse single-phase α Organization; When the temperature exceeds 300 ℃ ‚ The oxidation ability of copper is significantly enhanced ‚ Oxidation to form Cu2O ‚ Forming low melting point eutectic with Cu; At high temperature ‚ Cu can be mixed with impurity elements (such as Pb) in the base metal or welding wire ‚ Bi ‚ S, etc.) form eutectic with low melting point ‚ During welding cooling ‚ Low-melting eutectic aggregates a lot of grain boundaries ‚ Weakening the intergranular strength; Copper has good thermal conductivity ‚ Large linear expansion coefficient ‚ Fast cooling rate of weld during welding cooling ‚ Welding stress is large. Therefore, due to the existence of eutectic with low melting point in high temperature zone during welding ‚ Hot cracks are easily formed under welding stress.

 

The intermediate transition layer is used to weld the copper/steel composite plate. Manual electrode arc welding for base welding ‚ Manual TIG welding is used to weld copper/steel transition layer and copper clad layer. The test shall be carried out in two ways: welding the base layer before welding the cladding layer and welding the cladding layer before welding the base layer.

Welding of Copper and copper alloy clad steel plate ‚ The joint strength shall be guaranteed ‚ Corrosion resistance of composite layer ‚ Prevent the formation of copper-steel alloy weld and mechanical mixture at the interface of the transition layer when welding copper/steel ‚ At the same time, prevent the generation of welding cracks and pores in the copper clad layer. therefore ‚ When welding copper/steel composite plate ‚ The following requirements shall be met: ① When welding clad copper ‚ The selected welding material shall be able to effectively control the impurity content in the weld and improve the deoxidization ability of the weld ‚ Avoid the occurrence of hot cracks and pores in the weld ‚ Make the joint have good corrosion resistance; ② The composition of the welding wire in the transition layer shall be able to reduce the impurities and content of the weld ‚ Good deoxidization and impurity removal ‚ And it shall have good solid solubility with the base layer and the composite layer; ③ The welding material of base steel shall be selected according to the principle of equal strength ‚ To ensure that the joint strength meets the design requirements. The selection of welding materials for each part is shown in Table 2.