Baoji Taicheng Clad Metal Materials Co., Ltd, as a first-class manufacturer of metal-clad plates in the industry, would like to ask you today to briefly introduce the welding characteristics of copper-steel clad plates and the common problems in welding. The introduction is as follows.
The welding characteristics of the copper-steel clad plate are as follows: the copper-steel clad plate is made of steel as the base layer and copper as the clad layer. To meet the structural requirements for strength, stiffness, toughness, and weldability, the copper cladding meets the structural requirements for corrosion resistance and other special properties. The copper-steel composite plate saves a lot of copper, reduces the cost of structural manufacturing, and is suitable for chemical, petroleum, pharmaceutical, and other fields.
Copper-steel clad steel plates are often made of deoxidized copper into oxygen-free copper for cladding. The lattice types, lattice constants and atomic radii of steel and copper at high temperatures are very close, which is beneficial to welding. However, the melting point, thermal conductivity, coefficient of linear expansion, and other physical properties of copper and steel are quite different, which brings certain difficulties to welding.
1. The thermophysical properties of the cladding layer of the copper-steel clad plate and the base metal are quite different. The thermal conductivity and linear expansion coefficient of copper and steel are quite different, and the crystallization temperature range of the copper-iron binary alloy is very large. Therefore, when welding Welds are prone to hot cracks and incomplete penetration.
2. The cladding is easily oxidized to form a low-melting eutectic distributed at the grain boundary, which reduces the plasticity of the weld and causes cracks.
3. The dilution of the welding seam of the transition layer by the base layer not only reduces the conductivity of the cladding layer but also easily causes defects such as pores and cracks in the welding seam.
4. The surface activity of copper to iron is high, and the liquid copper or copper alloy may penetrate into the steel surface in the near seam area that it contacts so that infiltration cracks are formed in the near seam area of the steel.
In fact, the weld metal containing Ni, Al, and Si copper alloys has less penetration to steel, while the Sn-containing bronze penetrates more seriously. In addition, the microstructure of the steel also has an important influence on the penetration cracks. Liquid copper can infiltrate austenite but not ferrite, so penetration cracks are easy to occur when the base layer is single-phase austenitic steel, while the base layer is austenite- Ferritic dual-phase steels are less prone to penetration cracks.
If you need copper-steel composite plates or other metal composite materials in your production work, you are welcome to consult us. We will definitely provide you with the best quality copper steel explosion weld clad plate, looking forward to our cooperation!
