异型管

异型管生产之后必须进行相应检测，以确保钢管的质量。常用的检测方法主要有以下五种：利用一些物理现象进行测定或检验的方法。异型管、异型管等管材内部缺陷情况的检查，一般都是采用无损探伤的方法，比如超声波探伤、射线探伤、渗透探伤、磁力探伤等。

Corresponding inspection must be carried out after special-shaped pipe production to ensure the quality of steel pipe. There are five commonly used detection methods: using some physical phenomena to determine or test the method. Non-destructive testing methods are generally used to inspect the internal defects of special-shaped pipes, special-shaped pipes and other pipes, such as ultrasonic testing, ray testing, penetration testing, magnetic testing, etc. 异型管的强度检测，常见的方法有水压试验和气压试验两种。它们都能检验在压力下管道的焊缝致密性。气压试验比水压试验更为灵敏和速，同时检测后的异型管不用排水处理，对于排水困难的产品尤为适用。但试验的危险性比水压试验大。进行检测时，必须遵守相应的安全技术措施，以防过程中发生事故。

There are two common methods for strength testing of special-shaped pipes: hydraulic test and barometric test. They can test the weld tightness of pipelines under pressure. The air pressure test is more sensitive and faster than the water pressure test. At the same time, the special-shaped pipe after testing does not need drainage treatment, which is especially suitable for products with difficult drainage. But the test is more dangerous than the hydraulic test. In order to prevent accidents in the process of inspection, corresponding safety and technical measures must be observed.

外观检测是一种手续简便而又应用广泛的检验方法，主要是发现异型管焊缝表面的缺陷和尺寸上的偏差。一般通过肉眼观察，借助标准样板、量规和放大镜等工具进行检验。若焊缝表面出现缺陷，焊缝内部便有存在缺陷的可能。钢管应做静水压检测而无渗漏现象，试验应力按相应钢带标准规定屈服度最小值的60%选取。

Appearance inspection is a simple and widely used inspection method, which mainly finds the defects on the weld surface and the size deviation of the special-shaped pipe. Generally through naked eye observation, with the help of standard templates, gauges and magnifying glasses and other tools for inspection. If there is a defect on the surface of the weld, there is a possibility of defect inside the weld. Pipe should be hydrostatic testing without leakage. The test stress should be selected according to 60% of the minimum yield specified in the corresponding steel strip standard.

贮存液体或气体的焊接螺旋管、异型管等管道，其焊缝的不致密缺陷，如贯穿性的裂纹、气孔、夹渣、未焊透和疏松组织等，可用致密性试验来发现。致密性检验方法有煤油试验、载水试验、水冲试验等。

The non-compactness defects of welded spiral pipes and special-shaped pipes storing liquid or gas, such as penetrating cracks, blowhole, slag inclusion, non-penetrating and loose structure, can be found by compactness test. The test methods of compactness include kerosene test, water loading test and water scouring test.