Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral pipe, pipe, seamless tube, spiral Gansu, reasonable price and stock. Within welding and outside welding Lincoln welding machine for single or double wire submerged arc welding, thereby obtaining a stable welding quality. After welding the weld line ultrasonic injury examination was to ensure 100% coverage of non-destructive testing spiral weld. If defective, coiled tubing, automatic alarm and spraying tags, production workers and so at any time adjusting the process parameters, a large spiral, and remove defects. Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral pipe, pipe, seamless tube, reasonable price and stock. Inspection of physical methods: physical test method is to use some of the physical phenomena measured or tested method. Or within the workpiece material defects and inspection, q345b spiral, it is generally used NDT methods. NDT ultrasonic flaw detection, radiation detection, penetration testing, magnetic testing, etc. Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral pipe, pipe, seamless tube, reasonable price and stock. Hydrostatic test should be done each pipe hydrostatic test without leakage test pressure press Calculate P = 2ST / D formula S- hydrostatic test of test stress Mpa, hydrostatic test stress testing in accordance with the respective strip standards of minimum yield (Q235 to 235Mpa) of 60% selection. Regulators time: D <508 Test pressure holding time of less than 5 seconds; D≥508 test pressure holding time less than 10 seconds 4 non-destructive testing of steel welding seam, strip end weld and circumferential joints should be X-ray or ultrasound test. Mastery spiral price _ VAI (certified) _ Gansu spiral from the Tianjin Steel Trade Co., Ltd. Mastery. Mastery of Tianjin Steel Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) Shandong Liaocheng, steel leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Mastery Steel Union leaders in the staff warmly welcome all inquiries negotiations to create accessible VAI better future.