ArHeN2H2 protective gas for consumable electrode gas shielded nickel-based welding wire

Abstract

The invention provides an ArHeN2H2 protective gas for a consumable electrode gas shielded nickel-based welding wire. The melting electrode gas shielded welding adopts a nickel-based welding wire and an ArHeN2H2 protective gas, and the mass ratio of the mixed use amount of the nickel-based welding wire and the ARHN2h2 protective gas is as follows, 45-50% of Ar, 45-50% of He, 2.5-3.5% of N2, and 1.0-1.5% of H2. The use amount of the ArHeN2H2 quaternary protection gas is mixed through different proportions, the content of nitrogen elements in the weld joint of the large-thickness plate is guaranteed, excellent arc stiffness is achieved, the directivity is high, free of burning loss of nitrogen elements is achieved, the compactness degree of the welding seam is improved, and the technical problem that the mechanical property of a nitrogen element lost weld joint is not stable in the welding process is solved. In the NiCrMo-3 nickel-based melting electrode gas shielded welding, ArHeN2H2 quaternary gases are mixed according to a ratio to serve as protective gas, excellent arc stiffness is achieved, the welding efficiency is improved, the construction period is shortened, and the production cost is reduced; the compactness degree of the welding seam is improved, and the welding difficulty is reduced; and the ArHeN2H2 protective gas is suitable for being used as a protective gas for aconsumable 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...

AI Technical Summary

Problems solved by technology

The ArHeN 2 h 2 The amount of shielding gas is mixed in different proportions to ensure the content of nitrogen in the weld, and has excellent arc stiffness, strong directivity, and excellent welding without nitrogen burning, which improves the density of the weld and solves the problem of welding The technical problem of unstable mechanical properties of weld seam due to the loss of nitrogen element in the process