In the last sharing, we have basically understood the basic knowledge and difficulties in the welding of some copper-steel clad plates, so what is the welding process like?
The most suitable method for welding copper-steel clad plates is inert gas shielded welding (TlG, MG). When the thickness of the copper cladding is greater than 3mm, the recommended preheating temperature is not less than 150°C, and the copper electrode with a diameter of less than 1.6mm is used for welding. , in order to control the iron content of the clad weld due to dilution to ensure its corrosion resistance.
There are various forms of grooves. The cladding layer or the base layer can be welded first. After the steel base layer is welded, the root must be cleaned to make the early connection slope of the transition layer and the cladding layer, and finally polished with a hand grinding wheel.
The selection principle of welding materials and clad welding wires is to ensure that the weld metal has good electrical conductivity, crack resistance, mechanical properties, and welding process performance. The selection principle of transition layer welding wire is that it can have good metallurgical compatibility with copper and steel. Since Ni and Cu, Ni and Fe can be infinitely dissolved in a solid and liquid state and form a continuous solid solution, nickel and nickel-based alloys are better materials for transition layer welding wire.
The main points of the welding process of copper-steel clad plate, when the thickness of the cladding layer is less than 2mm, a layer of copper should be carefully deposited on the steel base layer, and then semi-automatic MIG welding of the back-tilt welding method should be used for welding. The arc directly acts on the molten pool, and Does not act on the steel base, so that the iron content of the first layer of the weld bead is less than 5% to prevent hot cracks and penetration cracks. In order to prevent defects such as pores and cracks and improve the cold bending resistance of the weld, in addition to argon protection, a heat-concentrated welding method can also be used. Gas shielded welding.
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