Crane super large reduction chassis body welding process

For cranes that have a simple structure, high load capacity, and specific strength requirements but are produced in small quantities, ultra-large reducers are typically used with welded boxes. To ensure strong and stable welding while minimizing deformation, several key considerations must be taken into account during the welding process to guarantee the quality of the box. **1. Material Selection for the Box** Taking the gear housing as an example, one of its main application characteristics is operating under complex conditions with heavy loads, which demands high structural strength. At the same time, to ensure good weldability and overall welding quality, the carbon equivalent of the material should not be too high. This helps improve the material’s ability to be welded effectively. Additionally, cost efficiency is also an important factor. Therefore, it is recommended to use low-carbon structural steel such as Q345B for the main body of the reducer housing. For the bearing seat, materials like ZG310-570 are commonly used. These materials are well-suited for the welding process and can meet the general welding requirements of the reducer. **2. Welding Precautions** The welding process involves both the welding of the primary material Q345B and the joining of dissimilar materials such as Q345B and ZG310-570. To reduce welding distortion and enhance the precision of the box, different welding techniques and parameters are applied to various parts of the reducer housing. Careful planning and execution of the welding sequence are essential to maintain structural integrity and minimize warping. For more detailed information on welding procedures and best practices, you can refer to the attached content or consult "Metal Processing (Hot Processing)" No. 18. This resource provides comprehensive guidance on selecting the right materials and optimizing the welding process for industrial applications.

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