Method for repairing defects of aluminum and magnesium alloy castings

Abstract

The invention discloses a method for repairing defects generated by aluminum and magnesium alloy castings in production, and aims to solve the problems of poor repair welding effect and low percent of pass of the defects such as looseness of the existing aluminum and magnesium alloy castings. The method specifically comprises the steps that the positions of casting defects are determined through X-ray detection methods and the like, the outer surfaces of the defect positions are cleaned and polished, and grooves are machined in the outer surfaces of the defect positions; then the castings are placed in a closed container capable of being heated and pressurized, air in a cavity is extracted, and a vacuum environment with the absolute pressure smaller than 20 KPa is established, and keeping for a proper time is carried out; then the castings are electrified for a period of time at 380-420V and 180-210A, and the temperature of the closed container is increased to 360-390 DEG C; and argon is introduced into the closed container, the pressure in the closed cavity ranges from 80 MPa to 120 MPa, and the castings are powered off, and keeping for a proper time is carried out. After the loose defects of the castings are remelted to be in a semi-solid state, the loose defects are solidified and densified under high pressure, and therefore the effects of eliminating the loose defects and improving the casting quality are achieved.

Description

technical field [0001] The invention relates to a defect treatment method of aluminum and magnesium alloy castings, which belongs to a novel process method. Background technique [0002] With the rapid development of industry and the increasing demand for weight reduction in aerospace and automotive fields, the application of aluminum and magnesium alloys is becoming more and more extensive. Due to the unique advantages of casting in the field of forming complex parts, in recent years, such as ZM5, ZM6, ZL101A, ZL205A and other cast non-ferrous alloys with excellent performance and low price are more and more widely used. However, since casting is a special process, the factors affecting the quality of castings are intricate, the quality of the final product is difficult to control, and defects are prone to occur. Micro-porosity defects caused by poor feeding or long solidification time during the alloy solidification process sometimes occur on aluminum and magnesium alloy ...

AI Technical Summary

Problems solved by technology

[0006] The problem solved by the technology of the present invention is: aiming at the unsatisfactory treatment effect of defects such as loose aluminum and magnesium alloy castings, the present invention discloses a casting defect treatment method, which can achieve the purpose of high defect treatment pass rate and excellent final casting quality

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