Repair welding method for magnesium alloy casting oil way

A magnesium alloy and oil circuit technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of scrap castings, difficult to remove gaskets, loss of waste products, etc., to save castings, easy to remove, and small thermal expansion coefficient. Effect

Inactive Publication Date: 2016-05-04
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the defect appears in the tubular oil passage, since the oil passage is a closed cavity, the backing plate during repair welding should be placed in the oil passage, and the backing plate will be sealed in the oil passage cavity after welding. For aluminum alloy castings, it can be Use a copper plate as a backing plate, and remove the backing plate by corrosion, but due to the active chemical properties of magnesium alloys, the backing plate cannot be removed by corrosion, and it is difficult to remove the backing, which leads to the impossibility of repair welding, which means With the scrapping of castings, a large amount of waste loss is caused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The oil passage of the rear casing of a helicopter transmission system, the material grade is ZM6, has a blow hole defect after casting, the diameter of the oil passage at the defect is Φ12mm, and the length is 100mm. Repair welding is required to achieve the purpose of repair. Its specific implementation process is as follows:

[0033] (1) Process the graphite to make it consistent with the shape and size of the oil passage at the defect, that is, the graphite has a diameter of Φ12mm and a length of 100mm;

[0034] (2) Clean up the defects in the oil circuit until the defects are completely removed;

[0035] (3) Process the groove at the defect, and the angle at the groove is 50°;

[0036] (4) Put the processed graphite into the place to be welded, so that the graphite and the oil passage wall are attached;

[0037] (5) Adjust the position of the casting so that the weld is horizontal to facilitate repair welding;

[0038] (6) Clean up the welding wire, the materia...

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Abstract

The invention relates to a repair welding method for a magnesium alloy casting oil way. A graphite material is used as a repair welding base plate for carrying out repair welding on defects of a casting, so that the purpose of repair is achieved. The characteristics of softness, easy removal, high temperature resistance and thermal shock resistance of graphite are utilized, in the using process, the repair welding base plate can bear acute changes of temperature so that damage and cracks can be prevented, and has various properties needed by an argon arc welding base plate, it is possible to repair the defects of the magnesium alloy casting oil way part, and the purpose of saving the casting is achieved.

Description

technical field [0001] The invention relates to a repair welding method, in particular to a repair welding method for an oil circuit of a magnesium alloy casting. Background technique [0002] When magnesium alloy castings have defects during the production process, sometimes it is necessary to remove the defects, and then use manual argon tungsten arc welding to repair the defects to achieve the purpose of saving the castings. In the process of repair welding, the defect should be processed into a shape suitable for repair welding, such as arc-shaped grooves, commonly known as grooves. In order to prevent the weld from collapsing, it is necessary to place a backing plate under the groove. The backing plate is usually a copper plate or a refractory brick. After the welding is completed, the backing plate is removed. When the defect appears in the tubular oil passage, since the oil passage is a closed cavity, the backing plate during repair welding should be placed in the oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/32
CPCB23K9/16B23K9/235B23K9/32
Inventor 王德峰韩永华乔昕李悦徐鹏刘洪汇于忠军刘军孟凡奇
Owner HARBIN DONGAN ENGINE GRP
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