So how can welding stress be eliminated in nickel-based alloys, in order to prevent stress corrosion during use?

To relieve welding stresses and prevent stress corrosion in nickel-based alloys, the following methods are commonly used: 1. **Preheating**: Appropriate preheating of the components before welding can reduce the thermal stresses generated during the welding process. 2. **Control welding parameters**: Select appropriate values for parameters such as welding speed, current, and voltage in order to reduce heat input during welding and control the size of the heat-affected zone. 3. **Post-heat treatment**: Appropriate post-heat treatment, such as annealing or stress-relief treatment, is carried out after welding is completed. This helps to re-balance the internal structure of the material, thereby eliminating the stresses generated during the welding process. 4. **Segmented symmetric welding**: The use of segmented and symmetric welding techniques during the welding process allows for effective control and distribution of the stresses generated by welding. 5. **Use supports or clamps**: During welding, use appropriate supports or clamps to secure the components, thereby preventing additional stress caused by deformation due to temperature differences. 6. **Select appropriate welding materials**: Use welding materials that are compatible with nickel-based alloys to ensure good bonding between the weld area and the base material, thereby reducing welding stress. These methods can effectively reduce the stress generated during the welding of nickel-based alloys, thereby lowering the risk of stress corrosion. .