Detection Method Of Welding Bars After Welding Of Straight Seam Steel Pipe

First of all, from the inspection of physical methods: physical inspection methods are methods that use some physical phenomena for measurement or inspection. The inspection of internal defects of materials or workpieces generally adopts the method of non-destructive testing. The current non-destructive testing includes ultrasonic testing, radiographic testing, penetrant testing, magnetic testing, etc.

Tightness test: For welded containers storing liquid or gas, the non-dense defects of the welds, such as penetrating cracks, pores, slag inclusions, incomplete penetration, loose structures, etc., can be found by the tightness test. Tightness test methods include kerosene tests, water tests, water flushing tests, etc.

A superficial judgment is an appearance inspection. The appearance inspection of welded joints is a simple and widely used inspection method. It is an important part of the finished product inspection. It is mainly to find defects on the weld surface and dimensional deviations. Generally, it is inspected by the naked eye, with the help of standard templates, gauges, magnifying glasses, and other tools. If there is a defect on the surface of the weld, there is a possibility of a defect inside the weld.

Strength test of the pressure vessel: In addition to the tightness test, the pressure vessel also needs to undergo the strength test. Commonly there are two kinds of hydrostatic tests and air pressure tests. They both inspect the tightness of welds in vessels and pipes operating under pressure. The pneumatic test is more sensitive and faster than the hydraulic test, and the products after the test do not need to be drained, which is especially suitable for products with difficult drainage. However, the risk of the test is greater than that of the hydrostatic test. During the test, the corresponding safety technical measures must be followed to prevent accidents during the test.