Welding application of NM360 wear-resistant steel and Q345A steel

Today, many industrial products involve the application of NM360 wear-resistant steel and Q345A steel. The use cases of both of these steels depend on the physical and mechanical properties of each. For welded components, NM360 and Q345A are often used together to create more durable and reliable products. This article will discuss what makes these two steels useful for welding applications and how one can go about welding them together.
    
NM360 is an alloy of nickel, chrome, and molybdenum, and it is designed for high wear life. It offers excellent wear resistance, making it well-suited for components where contact, abrasion, and impact wear are expected. Typical applications of NM360 include machine parts, crusher components, and grinders.
    
Q345A is a carbon-manganese steel with good weldability, high strength-to-weight ratio, and excellent corrosion resistance. It is commonly used for power plant construction, industrial boilers, bridges, ships, vehicles, and other heavy structural applications.
    
When welding NM360 and Q345A, the selection of the welding process depends on the characteristics of the component. For example, carbon dioxide (CO2) shielding gas is adequate for welding components that are 1/4 inch thick or less. However, if the component is thicker than ¼ inch, flux-cored arc welding (FCAW) or submerged arc welding (SAW) should be used. The welding process must also take into account the type of metals that are being welded together.
    
The first step when welding NM360 and Q345A is to prepare the materials. The cleaning process should be done first to ensure a strong bond between the two metals. It is recommended to use a brush or sandpaper to remove any rust or dirt on both materials before welding.
    
The next step is to choose the right welding rods. For welding NM360 and Q345A, low-hydrogen electrodes should be used. These electrodes will produce a weld that is more resistant to cracking. It is recommended to use a rod with an E6010 classification.
    
The NM360 and Q345A should be clamped firmly together before welding. This ensures that the joint is strong and even. The welding process should start from the edge of the object and move inward. This will prevent any cracks from forming in the weld.
    
In order to get the best results, a backing strip should be used. This strip is generally made of low-alloy steel and should be placed at the back of the joint during welding. This provides additional protection against arc blow-out and helps prevent any deformation.
    
Once the welding process is done, it is important to stress relieve the welded joint. The heat of welding can cause localized stress in the joint, which can cause cracking or distortion. Stress relieving reduces this stress, ensuring that the welded joint is strong and structurally sound.
In summary, NM360 and Q345A are both excellent materials for welding applications. They can be used together to create a strong and durable welded joint. It is important to properly prepare the materials for welding by cleaning them and selecting a suitable welding rod. The welding process should also be done correctly and followed by stressing relieved treatment to ensure that the joint is fully functional and able to withstand any wear or impact.

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