Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral steel pipe, welded pipe, seamless tube spiral, reasonable price, the cash supply. Within the welding and soldering are used outside the United States 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 defects, automatic alarm and spraying tags spiral manufacturers, production workers and so at any time adjusting the process parameters thick spiral, and remove defects. Mastery of Tianjin Steel Trade Co., Ltd. specializes in the supply of various types of spiral steel pipe, welded pipe, seamless tube galvanized spiral, reasonable price, the cash supply. Hydrostatic test should be done each pipe hydrostatic test without leakage test pressure press Calculate P = 2ST / D where S- hydrostatic testing of experimental stress Mpa, hydrostatic test stress testing in accordance with the respective strip yield of the minimum standards (Q235 is 235Mpa) 60% selection. Regulators time: D <508 test pressure holding time of not less than 5 seconds; D≥508 test pressure holding time less than 10 seconds four non-destructive testing of steel pipe welding seam, steel butt welds and circumferential joints should be X-rays or ultrasound examination. Spiral plant, Liaoning spiral, accessible from the Tianjin Steel Union Steel Union Co., Ltd. Mastery. Mastery of Tianjin Steel Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve accessibility innovative ideas will lead VAI and you hand into the brilliant, for a better future!