1. Combined effect of welding residual stress and thermal stress
As shown in Figure 1, the welding heat of the wear-resistant steel plate NM360 will generate a large amount of welding residual stress inside the steel. In addition, when the temperature difference in the application environment is large, the wear-resistant steel plate NM360 will also experience thermal stress. The combination of welding residual stress and thermal stress will cause tensile stress at the welded joint, which increases the chance of cracking in the wear-resistant steel plate NM360.
2. Improper welding parameters
When welding the wear-resistant steel plate NM360, improper welding parameters can also cause cracking. As shown in Figure 2, when the welding current is too low, the amount of heat generated by welding will decrease and the welding penetration will be insufficient, which will lead to local residual stress. In addition, when the welding speed is too fast, it is easy to produce poor welding and insufficient heat input, which will also cause uneven residual stress and easy cracking.
3. Unreasonable design of parts
Unreasonable design of wear-resistant steel plate NM360 parts may also cause cracking. As shown in Figure 3, when the thickness of the wear-resistant steel plate NM360 is too thin or the width is too wide, it is difficult to obtain uniform heat input during welding, which will cause internal residual stress and increase the chance of cracking.
In summary, welding residual stress, thermal stress, improper welding parameters and unreasonable design of parts can all cause cracking of wear-resistant steel plate NM360. Therefore, in the process of application, attention should be paid to the selection of welding parameters, reasonable thermal design and reasonable design of wear-resistant steel plate NM360 parts to avoid cracking of wear-resistant steel plate NM360.
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