曼哈特（广东）数控有限公司如何控制高温焊接过程中发生的变化？

Controlling the changes that occur during high-temperature welding is the key to ensuring welding quality and preventing welding defects. Here are some methods to control the changes that occur during welding:

1. * * Choose appropriate preheating and post heat treatment * *: Preheating can reduce the temperature gradient during the welding process, reduce thermal stress, and thus reduce the risk of welding deformation. Post heat treatment can further release welding residual stress, reduce deformation and crack generation. The temperature and time for preheating and post heat treatment should be reasonably selected based on the characteristics of the base material and welding requirements.

2. * * Use appropriate fixtures and positioning * *: The use of fixtures and positioning tools can ensure the stability and correct position of the workpiece during the welding process. The correct fixture can reduce the degree of freedom during the welding process and reduce the chance of welding deformation. Meanwhile, the accuracy of positioning can ensure the quality of welded joints and reduce the need for subsequent correction.

3. * * Control welding parameters * *: Welding parameters such as current, voltage, welding speed, and the selection of welding materials have a significant impact on the changes in the welding process. By selecting and adjusting these parameters reasonably, the size and distribution of heat input can be controlled, thereby reducing the risk of welding deformation and cracks. For high-temperature welding, it may be necessary to choose a lower welding speed and appropriate welding current and voltage.

4. * * Choose the appropriate welding sequence * *: Welding sequence is one of the important factors affecting welding deformation. A reasonable welding sequence can reduce heat accumulation and stress concentration, thereby controlling changes during the welding process. In high-temperature welding, it is usually recommended to weld from the inside out or from the center out to reduce the generation of deformation and residual stress.

5. Real time monitoring and feedback control: Modern welding technology can monitor the parameters and quality of the welding process in real time, such as using lasers, visual sensors, and automatic control systems. By real-time monitoring and feedback control, problems during the welding process can be detected and adjusted in a timely manner, thereby controlling the changes that occur during welding.

6. * * Adopting cooling measures * *: During high-temperature welding, taking appropriate cooling measures can lower the temperature of the welded joint, reduce the generation of thermal stress and deformation. For example, water cooling or air cooling can be used to cool welded joints.

It should be noted that controlling the changes that occur during welding is a comprehensive task that requires comprehensive consideration of the characteristics of the base material, welding requirements, welding environment, and actual operating conditions. Therefore, in practical applications, reasonable selection and adjustment should be made according to specific situations to obtain the best welding results.