What are the common ways of detecting the weld quality of welded steel pipe?

In terms of the physical method: physical inspection is a way to measure or test with the help of some physical phenomena. The inspection of materials or internal workpiece defects conditions generally adopts the method of nondestructive flaw detection. The current nondestructive detections are ultrasonic testing, X-ray detector, penetration inspection, magnetic testing, etc.
1. Density inspection: for the welding container to store liquid or gas, no dense weld defects, such as the perfoliate crack, air hole, slag inclusion, incomplete fusion, loose organization, etc., can be found with the density test. The density testing methods are the kerosene test, water test, impact test, etc.
2.Judgment on the surface(the visual inspection).
The welding joint inspection is a kind of widely used test method with quite a simple procedure, and is an important content of the finished product inspection, mainly to find out the weld defects on the surface and size deviation. Testing methods: usually observe by the naked eye, and test with the aid of standard samples, gauges, and magnifying glass test tools. If the defects exist on the weld surface, it has a big possibility to have defects inside the weld.
3. The strength inspection of the pressure vessel: pressure vessel, besides the leakage test, shall also carry out the strength test.

Two kinds of commonly used are hydrostatic test and pressure test.

They can both test the weld density of pressure vessels and pipelines working under pressure. The pressure test is more sensitive and fast than the hydrostatic test, at the same time, after testing, the products do not need to carry out drainage treatment, which makes it especially suitable for the product with drainage difficulties. But the dangers of the pressure test are larger than the hydrostatic test. So during the test, we must observe the corresponding safety technical measures, in case of accidents occur in the process of the test.

Cangzhou Shenlong Pipe Manufacturing Co., Ltd. cooperates with Baosteel and Baogang to produce large-caliber seamless steel pipe, straight-seam welded pipe, spiral steel pipe, and pipe fittings. The products comply with API, ASTM, DIN, BS, and JIS standards, and can accept SGS, BV, and other inspections. The products are used in oil, natural gas, bridge, water conservancy, and other large-scale projects, which are worthy of trust.