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A Repairing Process for Surface Defects of Magnesium Alloy Castings

A magnesium alloy defect technology, applied in the field of repairing surface defects of magnesium alloy castings, can solve the problems of rapid cooling shrinkage and unevenness in the repair welding area, achieve high repair welding efficiency, easy operation, and prevent welding regeneration defects.

Active Publication Date: 2016-07-06
CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a repair process for surface defects of magnesium alloy castings, which can solve the problem of microstructure transformation of metal cast magnesium parts in the repair welding thermal cycle and the problems of rapid cooling and uneven shrinkage in the repair welding zone, so that the repaired metal cast The magnesium base metal structure basically maintains the original structure and properties, prevents cracks, and effectively controls welding deformation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A repair process for surface defects of magnesium alloy castings. Taking a cast magnesium alloy part as an example, due to the low casting quality, defects such as shrinkage cavities, holes and loose tissue often appear on the near-end surface, so it must be repaired and welded. Contains the following steps:

[0016] (1) Defect cleaning: Make the corners of the defect fully visible and the metal substrate with a smooth transition, and use a metal wire brush to remove the oxide skin on the surface to be repaired and within 10mm of the surrounding area, and remove oil and impurities to keep the surface clean;

[0017] (2) Remove impurities: Use sandpaper to remove scale on the surface of the welding wire, and use alcohol to remove impurities on the surface;

[0018] (3) Preheating: Slowly preheat the surface of the metal substrate at the defect of the cleaned part for 30 minutes, so that the surface temperature of the metal substrate at the defect reaches 300 °C;

[0019...

Embodiment 2

[0023] A repairing process for surface defects of magnesium alloy castings. Taking a casting magnesium alloy shell part as an example, due to the carelessness of workers, two parts were thinned by 3mm during milling, which seriously affected the structural strength, and repair welding was necessary. Contains the following steps:

[0024] (1) Defect cleaning: Make the corners of the defect fully visible and the metal substrate with a smooth transition, and use a metal wire brush to remove the scale on the surface to be repaired and within 12mm of the surrounding area, and remove oil and impurities to keep the surface clean;

[0025] (2) Remove impurities: use sandpaper to remove scale on the surface of the welding wire, and use acetone to remove impurities on the surface;

[0026] (3) Preheating: Slowly preheat the surface of the metal substrate at the defect of the cleaned part for 30 minutes, so that the surface temperature of the metal substrate at the defect reaches 300 °C;...

Embodiment 3

[0031] A repair process for magnesium alloy casting surface defects, it comprises the following steps:

[0032] (1) Defect cleaning: Make the corners of the defect fully visible and the metal substrate with a smooth transition, and use a metal wire brush to remove the oxide skin on the surface to be repaired and within 15mm of the surrounding area, and remove oil and impurities to keep the surface clean;

[0033] (2) Remove impurities: Use sandpaper to remove scale on the surface of the welding wire, and use alcohol to remove impurities on the surface;

[0034] (3) Preheating: Slowly preheat the surface of the metal substrate at the defect of the cleaned part for 40 minutes, so that the surface temperature of the metal substrate at the defect reaches 500°C;

[0035] (4) Repair welding: After the preheating temperature on the surface of the part reaches 500°C, use an AC welding machine to repair the defect. The diameter of the welding wire is φ5mm. The continuous welding time i...

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Abstract

The invention discloses repairing process for a surface defect of magnesium alloy casting. The process includes steps of cleaning and machining the defect, cleaning welding wires, pre-heating, repairing welding, preserving heat and the like. The process has the advantage that by means of the pre-heating, fast welding, heat preservation and the like, a thermal stress range is small, magnesium casting is basically not deformed, a base material texture of repaired magnesium casting basically keeps original texture and performance, and a problem of conversion of metal magnesium casting texture in thermal cycle of welding repairing and a problem that a welding repairing area is cooled fast and uneven in contraction are solved. The repaired metal magnesium casting base material texture basically keeps the original texture and performance, cracks and a new welding regenerated defect are prevented, and welding deformation is effectively controlled. The repairing process is applicable to repairing of the surface defect of the magnesium casting and the repairing of surface allowance insufficiency, widens an application range, and has the advantages of being simple to operate, low in cost, easy to master and high in welding repairing efficiency.

Description

technical field [0001] The invention relates to a process for repairing surface defects of magnesium alloy castings, and belongs to the technical field of machining processes. Background technique [0002] For a long time, the research and application of repair welding of cast iron, cast magnesium and cast aluminum has been a very concerned and difficult problem in the field of engineering technology. At the same time, since magnesium alloys are particularly prone to defects such as porosity, loose structure, and excessive impurity content during casting, various casting defects will inevitably appear in engineering applications; on the other hand, in actual production and processing, due to poor casting Uniformity, or digging knife, bump damage caused by processing, etc. lead to insufficient machining allowance in the subsequent process. Once casting defects or insufficient machining allowance occur, effective rescue measures must be taken, otherwise, the parts will be over...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00
Inventor 夏昌龙任志强万轲刘健杨滨涛
Owner CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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