ArHeN2CO2 protective gas for consumable electrode gas shielded nickel-based welding wire

Abstract

The invention provides an ArHeN2CO2 protective gas for a consumable electrode gas shielded nickel-based welding wire. The consumable electrode gas shielded welding adopts the nickel-based welding wireand an ArHeN2CO2 quaternary protective gas, the mixing using amount of the nickel-based welding wire and the ArHeN2CO2 quaternary protective gas comprises the following components of, by mass, 45-50%of Ar, 45-50% of He, 2.5-3.5% of N2, and 2.5-3.5% of CO2; the use amount of the ArHeN2CO2 quaternary protective gas is mixed through different proportions, so that the content of nitrogen elements ina weld joint of a large-thickness plate is ensured, and excellent arc stiffness and strong directivity are achieved; and excellent welding of the nitrogen element without burning loss improves the compactness degree of the weld joint, and the technical problems that the nitrogen element losses and the mechanical property of weld joint is not stable in the welding process are solved. Due to the fact that the method adopting the ArHeN2CO2 quaternary gas to be mixed according to the proportions to serve as the protective gas in NiCrMo-3 nickel-based melting electrode gas shielded welding, the excellent arc stiffness is achieved, the welding efficiency is improved, the construction period is shortened, and the production cost is reduced; and the compactness degree of the weld joint is improved, and the welding difficulty is reduced, and the gas is suitable for being used as the protective gas in application for a consumable electrode gas shielded nickel-based welding wire.

Description

technical field [0001] The invention relates to a nickel-based welding wire for MIG-MAW, in particular to a protective gas for MIG-MAW nickel-based wire. Background technique [0002] At present, NiCrMo-3 nickel-based welding materials are mainly used in the nuclear industry and low-temperature steel materials, and are irreplaceable welding materials. At present, the welding methods are mainly argon arc welding, submerged arc welding and manual arc welding. The welding efficiency is low, the quality is unstable, and the repair rate is high, which seriously affects the construction quality of nuclear industry structures and cryogenic structures. Reduced the international competitiveness of similar products. [0003] NiCrMo-3 nickel-based MIG welding wire, although its welding efficiency is high, but with conventional shielding gas, the arc drifts during the welding process, the arc directivity is not strong, and the drift is serious, resulting in incomplete fusion and incomp...