Welding technology of two-phase stainless steel pipeline of chemical carrier underwater discharge pipe

• Main Authors: ZHU CHI, HUANG AILONG
• Format: Patent
• Language: Chinese; English
• Published: 25.10.2019
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The invention discloses a welding technology of a two-phase stainless steel pipeline of a chemical carrier underwater discharge pipe. The welding technology comprises the steps that weldment butt joint is carried out; welding is carried out, concretely, manual argon tungsten-arc welding is adopted for sectional type welding by taking the circumferential direction of the pipeline as the welding direction; an SMT-2594 welding wire with the diameter of 2.4 mm is adopted, welding current is 55-65 A, voltage is 9.5-10.5 V, and the welding speed is 3.36-4.44 cm/min; mixed protective gas of 98% argonand 2% nitrogen is filled into a welding gun, and the flow rate of the protective gas is 10-15 L/min; and when a welded joint priming coat is welded, the welding of the priming coat is carried out bythe movable mode that the welding gun transversely oscillates between the two sides of a groove in the axial direction of the pipeline; and postwelding detection is carried out. Through selection ofthe welded joint groove, co