Quality Inspection Methods for Spiral Welded Steel Pipes

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2021-04-17

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On the surface, that is, during visual inspection, the visual examination of spiral steel pipe weld joints is a simple and widely used method, serving as an important component of final‑product inspection. Its primary purpose is to identify surface defects and dimensional deviations in the welds, typically carried out by naked eye observation, aided by standard templates, gauges, and magnifying glasses. If defects are found on the surface of a spiral steel pipe weld, there is a corresponding likelihood that internal defects may also be present.

　　1. On the surface, or through visual inspection, the visual examination of spiral steel pipe weld joints is a simple and widely used inspection method, serving as an important component of final‑product inspection. Its primary purpose is to detect surface defects and dimensional deviations in the welds, typically performed by the naked eye with the aid of standard templates, gauges, and magnifying glasses. If surface defects are found on the weld of a spiral steel pipe, there is a corresponding possibility that internal defects may also be present.

　　2. Physical Testing Methods: Physical testing methods rely on specific physical phenomena to perform measurements or inspections. For examining internal defects in materials or workpieces, nondestructive testing (NDT) is typically employed. NDT techniques include ultrasonic testing, radiographic testing, penetrant testing, and magnetic particle testing, among others.

　　3. Strength Testing of Pressure Vessels: In addition to leak‑tightness testing, pressure vessels must also undergo strength tests, typically hydraulic and pneumatic tests. Both methods assess the weld integrity of vessels and pipelines operating under pressure. Pneumatic testing is more sensitive and faster than hydraulic testing, and it eliminates the need for post‑test drainage, making it particularly suitable for products where draining is difficult. However, pneumatic testing carries greater risks than hydraulic testing; therefore, appropriate safety measures must be strictly observed during the test to prevent accidents.

　　Guangxi Nanning Canghai Steel Co., Ltd. specializes in producing straight-seam welded pipes, steel plate‑rolled pipes, large‑diameter steel pipes, spiral pipes, spiral‑welded pipes, straight‑seam pipes, spiral steel pipes, and steel casing tubes. As a professional manufacturer of spiral pipes, our products are widely used in pipeline systems for natural gas, petroleum, chemicals, power generation, heating, water supply and drainage, sugar production, papermaking, as well as in pile‑driving applications and steel support structures for subways.

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