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Method for copious cooling reinforcement processing of MB5 magnesium alloy argon arc welding joint

A technology of argon arc welding and welding joints, which is applied in the field of cryogenic strengthening treatment of MB5 magnesium alloy argon arc welding joints, and achieves the effects of simple operation, low price, easy transportation and storage

Inactive Publication Date: 2011-08-10
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In a word, above-mentioned three kinds of prior art all exist the limitation of some shortcoming and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] 1. Taking the MB5 magnesium alloy workpiece after automatic argon arc welding as an example, the operation steps are as follows:

[0007] ①Quenching the MB5 magnesium alloy welded joints that have undergone automatic argon arc welding with forced water cooling;

[0008] ② Put the quenched MB5 magnesium alloy welded joint into the DWS-2188 cryogenic strengthening treatment device with liquid nitrogen as the cold source and controlled by computer;

[0009] ③ Lower the temperature in the cryogenic treatment device from room temperature to -175°C at a cooling rate of 7°C / min;

[0010] ④Insulate at -175°C for 6 hours;

[0011] ⑤ Cut off the power, turn off the liquid nitrogen, turn on the device, and let the welded joint reach room temperature in the air.

[0012] The hardness and strength of the MB5 magnesium alloy welded joint after the cryogenic treatment in the above steps are respectively increased by 11% and 14% compared with those before the cryogenic treatment.

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Abstract

The invention relates to a method for copious cooling reinforcement processing of an MB5 magnesium alloy argon arc welding joint, belonging to the technical field of copious cooling reinforcement processing of a metal piece. The method comprises the following operation steps: (1) quenching the MB5 magnesium alloy welding joint obtained by argon arc welding; (2) putting the quenched MB5 magnesium alloy welding joint in a copious cooling processing device controlled by a control system; (3) reducing the temperature of the copious cooling processing device to minus 170 DEG C to minus 190 DEG C from room temperature at the cooling speed of 6 DEG C-8 DEG C / min; (4) insulating for 4 hours-6 hours; and (5) cutting off a supply power, closing a cold source, and opening the device so as to obtain the welding piece at room temperature in the air. The method has the advantages that (1) the hardness and strength of the welding joint are improved, and grain size can also be fined; and (2) operation is simple, cost is low, toxicity and pollution do not occur.

Description

Technical field: [0001] The invention belongs to the technical field of cryogenic strengthening treatment of metal parts, and in particular relates to a method for cryogenic strengthening treatment of MB5 magnesium alloy argon arc welding joints. Background technique: [0002] Magnesium is one of the most abundant light metal elements on the earth. Magnesium alloy is a lightweight material that can meet the needs of various industries and has promising development prospects. Compared with other materials such as aluminum and steel, it has low density and high specific strength. , High specific rigidity, good damping, machinability, thermal conductivity, strong electromagnetic shielding ability, good processing welding and damping performance, stable size, low price, recyclable and other advantages, known as "21st century green engineering materials" , It has broad application prospects in the fields of machinery manufacturing, automobile manufacturing, aerospace, navigation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 吴志生赵菲刘翠荣曾亮靳鹏飞
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY