Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral pipe, pipe, seamless tube, reasonable price and stock. Density test: a liquid or gas storage vessel welding, which is not dense weld defects such as penetrating cracks, pores, slag, incomplete penetration and loose organization, Gansu spiral, density tests available to detect. Compactness test methods are: kerosene trial, ballast water test, water will test. Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral pipe, pipe, seamless tube, reasonable price and stock. Within welding and outside welding Lincoln welding machine for single or double wire submerged arc welding, thick-walled spiral pipe, so as to obtain a stable welding quality. After welding the weld line ultrasonic injury examination was to ensure 100% coverage of non-destructive testing spiral weld. If defects, automatic alarm and spraying tags, coiled tubing, 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. Each pipe after hydrostatic test pressure radial seal. Test pressure and time by a steel pipe pressure microcomputer detection device is strictly controlled. Test parameters are automatically printed record. Pipe end machining, so that the end vertical slope altercation and accurate control of the blunt edge. Large diameter spiral | Tongda Steel Union (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.