The chromium carbide composite steel plate is produced by Qi Shuai is composed of low-carbon steel plate (Q235/A3) and alloy wear-resistant layer. According to customer requirements, wear-resistant steel plates with different thicknesses can be customized according to customer requirements.
Qishuai Company adopts advanced production technology, continuous innovation, and takes the customer's demand as the direction. It sums up the production experience in the field of wear-resisting and surfacing, and lays a solid foundation for providing customers with stable and reliable products and services.
During the surfacing process, the arc high temperature causes great welding stress on the mother board and the alloy solder layer, and many cracks are formed on the surface of the surfacing layer. If these cracks are small and diffuse, they will not penetrate into the carbon steel mother board, and in actual use, it will not cause adverse effects. If the crack continuously extends, forming a large crack of penetration and deep into the mother board, it will inevitably affect the strength of the chromium carbide composite wear plate. In severe cases, it causes breakage, which must be strictly prohibited. How to effectively control the shape, quantity and distribution of surfacing cracks is an important measure to ensure the quality of chromium carbide composite steel plates
The cracks in the surfacing layer of chromium carbide composite steel plates are caused by many factors. The main factors are the welding current, the workpiece temperature, the chemical composition of the mother board and the surfacing alloy, and the assembly of the chromium carbide composite wear plate. Clip mode.
The chromium carbide composite steel plateadopts the submerged arc automatic surfacing welding process, the welding current is generally 500-700A, the welding arc temperature reaches 6000-7000 °C, and the instantaneous high temperature causes the welding wire and the mother pipe to reach the melting point to form a molten pool, and adds The alloy powder that has entered the molten pool melts to form a weld overlay. During the surfacing process, the temperature of the mother board adjacent to the molten pool will reach 600-800 ° C or even higher. The surface surfacing layer of the chromium carbide composite steel plate is sequentially combined into a flat surface by a long weld bead of 20 to 40 mm width. In the surfacing, the temperature difference between the various parts of the mother board is large, resulting in extremely uneven expansion, shrinkage and deformation. Since the inner tube is tightly fastened by the pressure tube and cannot be freely deformed, it causes great thermal stress inside.
In addition, the surfacing layer formed by adding a large amount of alloy powder is a typical high hardness material, especially the difference in thermal expansion coefficient between the surfacing layer and the mother board, and the toughness of the mother board can withstand large thermal deformation, and high. The hardness of the hardfacing layer is almost zero. In the cooling process after the heat deformation, in order to release the welding stress existing in the chromium carbide composite wear plate, many sizes are generated on the surface of the weld layer perpendicular to the length of the weld bead. Unequal cracks.
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