In order to ensure the welding quality so that products meet the relevant technical standards and performance, we must strengthen the product quality inspection.

   Welding inspection method is as follows:

1. destructive testing: testing process needs to be a test subject, including mechanical testing, chemical analysis and testing, metallurgical analysis and fracture tests.

2. Non-destructive testing: testing process does not destroy the structure and material testing objects, including visual inspection, the strength test, the compactness of testing, nondestructive testing.

3. Process test: in the manufacturing process in order to ensure the correctness of the process carried out tests, including tests of welding material, welding procedure qualification test, preheat and post-weld heat treatment after inspection.

4. Pressure test: pressure test, also known as pressure test, he includes a hydraulic or pneumatic test for evaluating the performance of the overall strength of boilers, pressure vessels, piping and other welded components, deformation of size and no leakage.