NM500 weldability

    
    NM500 is a type of high strength wear-resistant steel plate produced by domestic mills. It is widely used in mining, metallurgy, cement, coal, power generation and other industries. Its mechanical properties and hardness are very high, so it is the preferred steel plate for the production of wear-resistant parts.
    
    In addition to its excellent wear resistance, NM500 steel also has excellent welding performance. It has good cutting performance and can be welded with ordinary welding rods. The intergranular corrosion of the weld is small after welding, and the welding process is simple. However, NM500 steel hardens rapidly due to its high hardness, so appropriate preheating is required. During welding, the protective gas should be turned on to prevent rust.
    
    The welding parameters should be adjusted according to the thickness of the NM500 steel plate. The respective suitable welding parameters are as follows: when the thickness of NM500 steel is 3-10mm, the selection of welding current should be 160-200A, and the welding carbon dioxide should be 8-14mm/min; when the thickness of NM500 steel is 20mm-50mm, the selection of welding current should be 200-250A, and the welding carbon dioxide should be 12-22mm/min.
    
    It is worth noting that when welding NM500 steel, the welding current should be lowered by 10-20% when the welding speed is too fast, and the welding current should be increased by 10-20% when the welding speed is too slow. The welding should not stay too long in one place, and the welding time should not be too long. The total welding time of the entire construction joint should not exceed 20 seconds.
    
    In addition, when welding NM500 steel plate, it needs to avoid welding at too low temperature, or even unnecessary preheating, in order to prevent cold deformation and reduce excessive hardening. Also, the welding process should be enough to perform large-area multi-pass full-penetration welding, which can effectively avoid the formation of non-metallic inclusions and reduce welding cracks.
    
    In summary, NM500 steel is an excellent wear-resistant steel due to its high strength and hardness. It has good welding performance, but also has high requirements on welding parameters, temperature and measures. Therefore, during the welding process, the correct welding process and welding parameters should be determined according to the thickness and shape of the joint, so as to ensure the welding quality and welding efficiency.