Study on Welding Performance of Low Alloy Wear-resistant Steel Plate NM450

    
    The Low Alloy Wear-resistant Steel Plate NM450 is a special plate with a low alloy wear-resistant material designed for heavy wear applications. It is widely used in mining and construction, road and bridge building, agriculture, petrochemical and other industries. Good mechanical properties, strong impact resistance and wear resistance make it a very practical choice for many applications. In this paper, a study on the welding performance of low alloy wear-resistant steel plate NM450 is presented, with a focus on the welding properties of the material.
    
    1. Introduction
    
    Low alloy wear-resistant steel plate NM450 is a new kind of steel material with high wear resistance, strong impact resistance and good plasticity, which has good performance in practical application. The weldability of NM450 steel is related to the welding process and welding material, and the impact of them on welds is obvious. Therefore, an in-depth analysis of the weldability of this material is necessary, so as to get better understanding, determine the applicable welding process, and reduce the defects and reduce the cost of the production process.
    
    2. Characteristics of Low Alloy Wear-resistant Steel Plate NM450
    
    Low alloy wear-resistant steel plate NM450 is a hot-rolled wear-resistant steel plate produced by hot rolling and controlled rolling. Its forming performance is good, punching performance is excellent and the welding performance of its production is also good. The hardness and wear-resistant performance of NM450 are excellent, and its hardening depth can reach 450-550HB. This material has excellent properties such as high wear resistance and toughness, good plasticity and cold bending properties, good weld performance.
    
    3. Welding Performance Analysis
    
    3.1 Welding Parameters
    
    The welding performance of low alloy wear-resistant steel plate NM450 is affected by the welding parameters. Appropriate selection of welding parameters can reduce the welding defects, improve the weld shape and save welding materials. Generally, the welding current should be slightly larger than that of ordinary low-carbon steel plates. This is beneficial to improve the welding performance and reduce welding defects. The welding speed should be moderate and not too fast, so as to obtain good weld formation and weld penetration, and reduce the welding defects.
    
    3.2 Weldability
    
    The weldability of this material is good and the weld penetration is good. It is easy to form a good weld shape, and no weld defects such as cracks, pores and buried seams are found. It is suitable for various welding processes and various welding consumables. In addition, the uniformity of the material structure is also important for weldability, and the better uniformity of the material structure of NM450 steel is beneficial to improve the weld performance.
    
    3.3 Preheating and Post-welding Treatment
    
    The preheating and post-welding treatment of low alloy wear-resistant steel plate NM450 is very important for the weldability of the material. The preheating temperature should be above 200℃ and below 350℃. After preheating, it should be cooled slowly to avoid thermal stress and deformation. After welding, the welding parts should be completely cooled and then subjected to post-welding heat treatment. The post-welding heat treatment of low alloy wear-resistant steel should be within the range of 250~400℃. The preheating and post-welding heat treatment of NM450 steel can eliminate the welder's large thermal stress, reduce the residual deformation, improve workpiece corrosion resistance, increase workpiece hardness and other advantages.
    
    4. Summary
    
    The weldability of low alloy wear-resistant steel plate NM450 is good, and it can be welded with various welding processes and various welding consumables. In addition, it has good plasticity and cold bending properties, and is suitable for various welding process and welding consumables. Appropriate selection of welding parameters and preheating and post-welding treatment can significantly improve its welding performance and reduce welding defects.

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