Fluxes for Cast Iron Welding and How to Use Them

Abstract

The invention provides a soldering flux for cast iron welding and a use method of same. The soldering flux is prepared mainly by mixing powder and a liquid additive, wherein the powder is obtained mainly by mixing the following components with 100-200-mesh particle size: yttrocalcite powder, calcite powder, celestite powder, hornblende asbestos plaster, ferromolybdenum powder and ferrosilicon powder; the liquid additive is obtained by mixing an emulsifier and a wetting agent; and the mass percentages of all the components in the soldering flux are as follows: 25-30 percent of yttrocalcite powder, 20-30 percent of calcite powder, 10-12 percent of celestite powder, 10-20 percent of ferrosilicon powder, 3-5 percent of ferromolybdenum powder, 2-5 percent of ferrosilicon powder, 3-5 percent of emulsifier and 4-6 percent of wetting agent. The soldering flux and the use method thereof are simple, quick and convenient; heating is not needed before welding, and heat preservation is not needed after welding; the obtained weld metal has a beautiful appearance, and has no hot crack, cold crack, gas pores or fracture structures; and the welding technology is simple, the quality is stable and reliable, the cost is low, machining can be performed after welding, and pressure tests can achieve the index requirements.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a flux for cast iron welding and a method for using the same. Background technique [0002] The most commonly used cast iron electrodes in daily operations are nickel-based cast iron electrodes. However, when encountering iron castings with water pressure, air pressure and oil pressure requirements, nickel-based cast iron electrodes cannot meet the requirements for use. In the case of iron castings with high carbon or magnesium content, the droplets do not wet the groove, become small balls and fly away, which is very difficult to weld; at the same time, when using nickel-based cast iron electrodes to weld iron castings, the weld metal has the following defects: (1) When nickel-based cast iron electrodes are welded to iron castings working at high temperatures, the yield point of the weld metal will increase, the plasticity will decrease, and the notch sensitivity will incr...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects such as white spots, hardened structures and cracks that are prone to appear in the welding of cast iron in the prior art, as well as the problems that the welding process is complicated, the cost is high, and defects such as grain boundary cracks and pores are prone to occur, the present invention provides a method for The welding flux for cast iron welding and its usage method can achieve the purpose of being simple, fast, convenient and improving the quality of cast iron weld metal in the process of welding and repairing cast iron parts