1, From the face of it, that is visual inspection. Visual inspection of welded joints is a widely used procedure is simple but test method is an important part of product testing, the main defects and size deviations are found on the surface of the weld. Usually by the naked eye, with the standard model, gauge and test tools such as a magnifying glass. If the weld surface defects, weld defects there may be internal.
2, Physical test methods: physical test method is to use some physical phenomena measured or tested method. Internal defects in material or inspection of the work, usually using NDT methods. NDT ultrasonic flaw detection, radiation detection, penetration testing, magnetic testing and so on.
3, Pressure vessels strength test: pressure vessels, in addition to tightness test, but also the strength test. There are two common test pressure test and pressure. They can be tested in working under pressure vessels and piping welds compactness. Hydrostatic pressure test is more sensitive than the speed test and, at the same time after the test products do not waste water treatment, drainage problems for the product is particularly applicable. But the risk is greater than the test pressure test. When tested, it must comply with the appropriate safety measures to prevent accidents during the test.
