What are the technical requirements and related testing standards for welding heat resistance?

The requirements and testing standards for welding heat resistance technology are important indicators to ensure that materials can withstand high temperatures and heat affected zone stresses during the welding process. Welding heat can cause changes in material properties, therefore corresponding testing and evaluation are required. The following are the technical requirements and related test standards for welding heat resistance.

technical requirement

1. Material selection:

   - Choosing materials with good welding heat resistance usually requires the material to maintain high strength and toughness after welding.

2. Welding process:

   - Determine appropriate welding process parameters (such as welding temperature, welding speed, heat input, etc.) to reduce damage in the heat affected zone.

3. Heat affected zone:

   - Control the temperature and cooling rate of the heat affected zone during the welding process to reduce phase transformation and microstructural changes.

4. Crack resistance:

   - The material should have good crack resistance after welding, especially in the heat affected zone of welding.

5. Welding joint strength:

   - The strength of the welded joint should meet or exceed the strength standard of the base metal.

Test standards

1. Welding heat affected zone test:

   - Test method: The microstructure and properties of the heat affected zone are evaluated by welding test specimens and using metallographic analysis, microhardness testing, and other methods.

2. Tensile test:

   - Standard:GB/T 228TheASTM E8.

   - Purpose: To test the tensile strength and elongation of welded joints and evaluate their load-bearing capacity.

3. Impact test:

   - Standard:GB/T 229TheASTM E23.

   - Purpose: To evaluate the toughness of welded joints, especially their performance under low temperature conditions.

4. Hardness test:

   - Standard:GB/T 17394TheASTM E10.

   - Purpose: To measure the hardness of welded joints and heat affected zones, and evaluate their wear resistance and crack resistance.

5. Metallographic examination:

   - Standard:GB/T 2651TheASTM E112.

   - Purpose: To observe the microstructure of welded joints and evaluate the welding quality and structural changes in the heat affected zone.

6. Fatigue test:

   - Standard:GB/T 6402TheASTM E466.

   - Purpose: To evaluate the durability of welded joints under cyclic loading.

conclusion

The requirements and testing standards for welding heat resistance technology are important basis for ensuring welding quality and material properties. By selecting appropriate materials, controlling welding processes, and conducting systematic testing and evaluation, the performance of welded joints can be effectively improved, ensuring the safety and reliability of engineering structures.