Large diameter straight seam welded pipe in the factory should do before the mechanical performance test and flattening test and flaring test, and to meet the requirements of the standard requirements.
First from the surface to judge, that is, in the appearance of inspection. The appearance of the welded joint inspection is a simple procedure and a wide range of test methods, is an important part of the finished product inspection, mainly to find the weld surface defects and size of the deviation. Generally through the naked eye observation, with standard templates, gauges and magnifying glass and other tools for testing.
Pressure test of pressure vessel: pressure vessel, in addition to the sealing test, but also for strength test. Commonly there are two kinds of hydraulic pressure test and air pressure test. They are able to test the weld densities of containers and pipes working under pressure. Pneumatic test is more sensitive and faster than hydrostatic test, and the product is not drained when tested, especially for difficult drainage products. But the risk of testing than the hydraulic test. During the test, the corresponding safety and technical measures must be observed to prevent accidents during the test.
Diligence test: the storage of liquid or gas welding containers, the weld is not dense defects, such as penetrating cracks, pores, slag, not penetration and loose tissue, etc., can be used to find the compact test.
Physical method of inspection: the physical test method is the use of some physical phenomena for testing or testing methods. Materials or parts of the internal defects of the inspection, are generally used non-destructive testing methods.
