異型管生產之后必須進行相應檢測，以確保鋼管的質量。常用的檢測方法主要有以下五種：利用一些物理現(xiàn)象進行測定或檢驗的方法。異型管、異型管等管材內部缺陷情況的檢查，一般都是采用無損探傷的方法，比如超聲波探傷、射線探傷、滲透探傷、磁力探傷等。

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. 異型管的強度檢測，常見的方法有水壓試驗和氣壓試驗兩種。它們都能檢驗在壓力下管道的焊縫致密性。氣壓試驗比水壓試驗更為靈敏和速，同時檢測后的異型管不用排水處理，對于排水困難的產品尤為適用。但試驗的危險性比水壓試驗大。進行檢測時，必須遵守相應的安全技術措施，以防過程中發(fā)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.

外觀檢測是一種手續(xù)簡便而又應用廣泛的檢驗方法，主要是發(fā)現(xiàn)異型管焊縫表面的缺陷和尺寸上的偏差。一般通過肉眼觀察，借助標準樣板、量規(guī)和放大鏡等工具進行檢驗。若焊縫表面出現(xiàn)缺陷，焊縫內部便有存在缺陷的可能。鋼管應做靜水壓檢測而無滲漏現(xiàn)象，試驗應力按相應鋼帶標準規(guī)定屈服度最小值的60%選取。

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.

貯存液體或氣體的焊接螺旋管、異型管等管道，其焊縫的不致密缺陷，如貫穿性的裂紋、氣孔、夾渣、未焊透和疏松組織等，可用致密性試驗來發(fā)現(xiàn)。致密性檢驗方法有煤油試驗、載水試驗、水沖試驗等。

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.