Welding technology for nickel base alloy build-up welding of marine low-speed machine air valve sealing face

• Main Authors: BAO HAIBEI, JIA LIANJUN, DING GUODI, CHEN WENBIN, HU QIXIANG, ZHAO DAZHONG, ZHONG AIDONG, LIU HUINA
• Format: Patent
• Language: Chinese; English
• Published: 16.11.2016
• 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 adopting consumable electrode pulse gas-shielded welding for nickel base alloy build-up welding of a marine low-speed machine air valve sealing face according to the base material characteristics of an air valve, the weldability of nickel base alloy, an annular ship type welding groove of the air valve sealing face and the use condition of the air valve. The consumable electrode pulse gas-shielded welding mode is adopted, the welding power, the welding parameters and the shielding gas constituents are proportioned, factors such as forming of welding liens, globular transferring, arc striking, arc quenching, the overlap amount, preheating and the interlayer temperature are controlled, and the welding defects such as air holes, incomplete fusion and porosity of nickel base alloy build-up welding of the sealing face can be overcome in the existing producing and machining process of the air valve of a marine diesel engine. Thus, the high-quality air valve can be obtain