1. The cause of the stratification of the heat exchange tube and the performance of the stratification in the welding of the heat exchange tube, sometimes the delamination phenomenon occurs, and the main reason is that the temperature change during the welding process leads to the change of the microstructure of the material. The delamination phenomenon is mainly manifested in the uneven color, texture and hardness of the pipe wall, and in severe cases, the pipe wall will fall off and leak water.
Second, the treatment method.
1.Control the soldering temperature.
First of all, it is necessary to pay attention to controlling the welding temperature, especially the temperature at the welding interface, to ensure that it is within the tolerance range of the material. The welding current and voltage can be appropriately reduced, and the welding time can be shortened to reduce the impact of temperature changes on the material structure.
2.Choose the right welding material.
The use of suitable welding materials is also the key to avoid delamination, be sure to choose welding materials similar to the welded materials, and pay attention to the chemical composition, thermal expansion coefficient and melting point and other parameters of the materials to ensure that the properties and properties of the materials after welding are consistent with the original materials. 3.Control the state of your organization.
Before welding, heat treatment and other measures can be carried out to make the microstructure of the welded material reach the best state. At the same time, post-heat treatment can be carried out after welding, and an appropriate cooling rate can be arranged to ensure the uniformity and stability of the material at the weld.
4.Strengthen pre-welding preparation.
Before starting welding, it is necessary to carry out sufficient pretreatment of the material, including removing dirt, oxides, grease and other impurities, and removing the oxide layer to ensure the quality and effect of the welded interface.
3. Practical suggestions.
1.Follow the welding standards and specifications to ensure that the welding process is standardized and standardized; 2.Improve operation skills, shorten welding time, reduce temperature changes and thermal distortion;
3.Adjust welding parameters, change welding methods or use other welding equipment;
4.Do a good job of protective measures to ensure a clean working environment and avoid the impact of impurities on welding quality.
Through the above methods, the problem of heat exchange tube delamination during welding can be effectively avoided, and the welding quality and stability can be improved at the same time. Heat exchanger tubes