A beam-electron beam composite brazing method for high nitrogen steel

Abstract

The invention discloses a beam-electron beam composite brazing method for high-nitrogen steel, comprising: ① preparing solder paste and coating it on the surface to be welded; Light radiation heating welding is carried out at both ends and the central position; ③The surface to be welded is divided into side A and side B along the vertical line of the welding surface, and side A of the surface to be welded is brazed by electron beam virtual focus welding; ④Use electron beam real focus Soldering and brazing is to be performed on the B side of the welding surface; in parts by weight, the raw material alloy powder of the solder paste consists of 25-28 parts of Pd, 39-46 parts of Ni, 36-39 parts of Cr, 2.8-5.8 parts of vanadium-plated nickel graphite Alkene, 12-15 parts of Mn, 7-11 parts of Re, 6-9 parts of Si and 2-5.5 parts of B. The invention does not melt the high-nitrogen steel parent material during welding, does not lose nitrogen element, is not easy to produce pores, reduces welding heat-affected zone and residual stress, and enhances the mechanical properties of brazed joints.

Description

technical field [0001] The invention relates to the technical field of high-nitrogen steel welding, in particular to a method for beam-electron beam composite brazing high-nitrogen steel. Background technique [0002] High-nitrogen steel has the advantages of corrosion resistance, oxidation resistance, wear resistance and excellent mechanical properties. It is one of the important materials for the manufacture of aviation, ships and weapons. The welding technology of high-nitrogen steel is an important process that determines its application scope. links. At present, high-nitrogen steel welding technology is mainly based on friction welding, friction stir welding, TIG welding, MIG welding, explosive welding, gas shielded welding, laser and its hybrid welding. The nitrogen content of the steel itself is high, and the welding porosity problem caused by the nitrogen precipitation of the base metal often occurs during the welding process, which in turn induces the appearance of...

AI Technical Summary

Problems solved by technology

At present, high-nitrogen steel welding technology is mainly based on friction welding, friction stir welding, TIG welding, MIG welding, explosive welding, gas shielded welding, laser and its hybrid welding. The nitrogen content of the steel itself is high, and the welding porosity problem caused by the nitrogen precipitation of the base metal often occurs during the welding process, which in turn induces the appearance of other hard and brittle phases, weakens the properties of the material, and reduces the overall performance of the welded joint

[0003] The Chinese patent "Laser MIG Arc Hybrid Welding Method for High Nitrogen Steel" (application number 201210385839.2) provides a method for brazing high nitrogen steel using laser-MIG arc hybrid welding technology; Joint Strength Welding Device and Its Welding Method" (ZL201610363272.7) provides a new idea of ​​improved laser-arc hybrid welding of high nitrogen steel, and simultaneously solves the welding porosity of high nitrogen steel through the method of magnetic control and temperature control and poor toughness of welding heat-affected zone

However, the above composite welding method is not suitable for self-made high nitrogen steel 1Cr26Mn22N (by 0.9-2.1 parts N, 51-65 parts Fe, 1.9-2.7 parts Ni, 23-28 parts Cr, 19-25 parts Mn, 1.2-1.6 parts Mo , 0.2-0.6 parts of C, 0.02-0.05 parts of S, 0.05-0.08 parts of P and 0.5-0.8 parts of Si (by weight), there are still problems of base metal melting, nitrogen loss and weld width during welding In addition, due to the melting of the base metal and the loss of nitrogen elements, the welding surface is deformed greatly

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