Repair welding method for reducing welding cracks of magnesium rare earth alloy casting

A magnesium rare earth alloy and welding crack technology, which is applied in the field of repair welding to reduce welding cracks of magnesium rare earth alloy castings and repair welding of magnesium rare earth alloys, can solve the problems of reducing the mechanical properties of the repair welding area, so as to avoid cracking in the shrinkage stress field and improve Mechanical properties, the effect of increasing the grain boundary volume fraction

Active Publication Date: 2020-10-30
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0007] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to solve the problem that defects such as welding cracks are easily generated during the repair welding process of magnesium rare earth alloy castings by argon tungsten arc welding, which reduces the mechanical properties of the repair welding area, and provides a A Repair Welding Method for Reducing Welding Cracks of Magnesium Rare Earth Alloy Castings

Method used

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  • Repair welding method for reducing welding cracks of magnesium rare earth alloy casting

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Effect test

Embodiment 1

[0034] Taking the Mg-10wt%Gd-3wt%Y magnesium rare earth alloy casting as an example (wt% refers to the percentage of the composition in the total mass of the prepared magnesium alloy) for repair welding, the operation is shown as figure 1 shown.

[0035] Inspection of Mg-10wt%Gd-3wt%Y magnesium rare earth alloy castings through X-ray flaw detection, marking the defective parts and drilling and digging with pneumatic milling cutter to form grooves 2 to be repaired to ensure that The shape of the repair welding groove 2 is boat-shaped and has a smooth transition with the base metal surface. After the defects are removed, the casting is subjected to solid solution treatment. The solution treatment temperature is 480° C., and the solution time is 15 hours. After the solution treatment is completed, the surface of the repair welding groove 2 is polished to brightness with sandpaper. Then place the magnesium rare earth alloy casting 5 after solid solution treatment on the heating p...

Embodiment 2

[0038] Taking Mg-4wt%Y-2wt%Nd-1wt%Gd magnesium rare earth alloy casting as an example for repair welding.

[0039] Inspection of Mg-4wt%Y-2wt%Nd-1wt%Gd magnesium rare earth alloy castings through X-ray flaw detection, mark the defective parts and drill them with pneumatic milling cutter to ensure the shape of repair welding groove It is ship-shaped and has a smooth transition with the base metal surface. After the defects are removed, the casting is subjected to solid solution treatment. The solution treatment temperature is 500°C, and the solution time is 10 hours. After the solution treatment is completed, the surface of the groove to be repaired is polished to brightness with sandpaper. Then place the casting on the heating platform. After the temperature of the heating platform rises to the set temperature of 170°C, use the ultra-high frequency pulsed AC arc tungsten argon arc welding to fill the groove. The current waveform is a sine wave. , the pulse frequency is 10000H...

Embodiment 3

[0042] Taking the Mg-5wt%Y-2.5wt%Nd-1wt%Gd magnesium rare earth alloy casting as an example, repair welding is carried out.

[0043] Inspection of Mg-5wt%Y-2.5wt%Nd-1wt%Gd magnesium rare earth alloy castings through X-ray flaw detection, mark the defective parts and drill them with pneumatic milling cutter to ensure repair welding grooves The shape is boat-shaped and has a smooth transition with the base metal surface. After the defects are removed, the casting is subjected to solid solution treatment. The solution treatment temperature is 530°C, and the solution time is 6 hours. After the solution treatment is completed, the surface of the groove to be repaired is polished to brightness with sandpaper. Then place the casting on the heating platform. After the temperature of the heating platform rises to the set temperature of 250°C, use the ultra-high frequency pulsed AC arc tungsten argon arc welding to fill the groove. The current waveform is a triangular wave. The pulse f...

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Abstract

The invention discloses a repair welding method for reducing welding cracks of a magnesium rare earth alloy casting. The repair welding method comprises the following steps of carrying out solution treatment on the magnesium rare earth alloy casting of which a defect part material is removed before repair welding; then carrying out filler wire repair welding on the casting on a heating platform byusing argon tungsten-arc welding of an ultrahigh-frequency pulse alternating current arc; and after welding is finished, rapidly putting the casting in a heat treatment furnace for postweld heat treatment, and finally obtaining a magnesium rare earth alloy repaired casting without welding cracks. According to the repair welding method, not only can liquefied cracks and crystal cracks of a magnesium rare earth alloy in a repair welding process be remarkably reduced, but also a weld structure can be strengthened, and the repair welding quality of the magnesium rare earth alloy casting is effectively improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a repair welding process for magnesium rare earth alloys, in particular to a repair welding method for reducing welding cracks of magnesium rare earth alloy castings. Background technique [0002] As a new type of lightweight structural material, magnesium-rare-earth alloys have been widely used in ground transportation, aerospace, etc. , 3C products and other important equipment weight loss fields. In order to continuously adapt to the increasingly stringent requirements for lightweight equipment in the future, the application of magnesium rare earth alloys will gradually change from simple and small parts to large, complex and precise key structural parts. High-performance magnesium rare earth alloys have been widely used in important fields of national defense and military industries such as automobiles, aircraft, and rockets. [0003] However, large and complex magnesium-rar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/167B23K9/235
CPCB23K9/04B23K9/167B23K9/235
Inventor 童鑫吴国华张亮王迎新丁文江
Owner SHANGHAI JIAO TONG UNIV
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