A surfacing flux-cored wire for repair of press forging dies

Abstract

The invention provides a build-up welding flux-cored wire for restoring a forging die of a press. A flux-cored powder is wrapped by a carbon steel strip, and comprises the following components of 0.5-2 parts of sodium fluosilicate, 1.5-4 parts of calcium fluoride, 2.5-4 parts of rutile, 0.5-2.0 parts of sodium monoxide, 0.3-1.5 parts of potassium oxide, 1-3 parts of quartz, 10.2-23.81 parts of high carbon ferro-chrome, 16.75-37.14 parts of pure chrome powder, 0.86-2.02 parts of nickel powder, 2.86-4.13 parts of electrolytic manganese, 17-22.8 parts of ferro-molybdenum powder, 3.7-5.9 parts of ferrosilicon, 3.7-7.4 parts of ferrovanadium powder, 2-8 parts of multi-element rare earth powder, and 0.51-0.9 part of reduced iron powder. The build-up welding flux-cored wire has the advantages that the high-temperature tempering stability of the build-up welding layer prepared the build-up welding flux-cored wire for restoring the forging die of the press is higher than the high-temperature tempering stability of the build-up welding layer of the prior art; under the conditions of same specimen size, same tempering temperature and same tempering time, the tempering tissue is obviously denser than the tempering tissue of the welding wire of the prior art; the toughness is high, the cold and heat fatigue-resistant capability is good, and the service life is longer; the welding technological property is good, the slag removal is easy, and the number of spattering matters is fewer.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a welding material containing rare earth components and its application. Background technique [0002] The press relies on the pressure of the crank transmission or hydraulic transmission to forge the hot metal, and the hot metal is placed in the forging die and extruded. During the working process of the forging die, the temperature in contact with the high-temperature metal is as high as 500-700°C. The mechanical properties of the metal on the die surface will decrease after being heated, and it is easy to oxidize at high temperature. When the hot metal is forced to deform, it will rub against the surface of the die cavity, causing the die Easy to wear and tear. Therefore, the press forging die will fail after being used thousands of times, and this failure usually occurs within the local size of the surface. Due to the complex cavity of the mold, the processing t...

AI Technical Summary

Problems solved by technology

However, some convex positions of the mold absorb too much heat during the working process and the temperature is as high as 600°C, while the surfacing molds in Documents 1 to 3 are tempered at 550°C, and the tempering stability above 600°C is poor, and the tempered structure Coarse, the mechanical properties decline rapidly after long-term use, which affects the service life of the mold

In terms of process performance, compared with foreign welding wires, the welding wires in Documents 1 to 3 have poorer welding performance, mainly manifested in large spatter and high viscosity of slag, which is difficult to clean and affects production efficiency.

Images