A Method of Surface Microalloying to Improve Magnesium Alloy Welded Joints

A technology of welding joints and microalloying, which is applied in the coating process and coating of metal materials, can solve the problems of difficult welding of magnesium alloys, restrictions on the engineering application of magnesium alloys, and large residual stress, etc., and achieve the use of raw materials and equipment The effect of low cost, easy control of process parameters and simple equipment

Active Publication Date: 2020-05-05
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the unique physical and chemical properties of magnesium alloys, it is difficult to weld magnesium alloys. During the welding process, problems such as coarse grains in the weld seam, large residual stress after welding, and easy collapse of the weld seam occur. The mechanical properties of the welded joint are poor. Seriously restricting the engineering application of magnesium alloy

Method used

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  • A Method of Surface Microalloying to Improve Magnesium Alloy Welded Joints
  • A Method of Surface Microalloying to Improve Magnesium Alloy Welded Joints

Examples

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Embodiment 1

[0038] Firstly, automatic argon arc butt welding is performed on AZ61 magnesium alloy rolled plates:

[0039] 1) The thickness of AZ61 magnesium alloy rolled plate is 5mm, and the size is 60×120mm;

[0040] 2) After welding, use sandpaper and steel brush to remove the oxide layer on the surface of the plate to be welded, and then clean the surface of the plate with acetone to remove various impurities;

[0041] 3) if figure 1 The laser microalloying surface modification is carried out on the weld seam and heat affected zone of AZ61 magnesium alloy welding joint as shown in the figure. The surface distance of the material is 2.5cm, the powder feeding diameter is 2.5mm, the angle between the powder feeding nozzle and the base metal is 65°, argon is used for carrier gas and gas protection, and the flow rates of carrier gas and protective gas are 7L / min and 10L / min respectively. min. The defocus of the laser is 10mm, the laser power is 1700W, the laser spot is 2.5mm, and the sc...

Embodiment 2

[0047] Firstly, laser butt welding is carried out on the AM30 magnesium alloy rolled plate:

[0048] 1) The thickness of AM30 magnesium alloy rolled plate is 6mm, and the size is 60×120mm;

[0049] 2) After welding, use sandpaper and steel brush to remove the oxide layer on the surface of the plate to be welded, and then clean the surface of the plate with acetone to remove various impurities;

[0050] 3) if figure 1 The laser microalloying surface modification is performed on the weld seam and heat-affected zone of the AM30 magnesium alloy welding joint shown in the figure. The surface distance of the material is 1.5cm, the powder feeding diameter is 3.5mm, the angle between the powder feeding nozzle and the base metal is 55°, argon is used for carrier gas and gas protection, and the flow rates of carrier gas and shielding gas are 8L / min and 11L / min respectively. min. The defocus of the laser is 13mm, the laser power is between 1900W, the laser spot is 3mm, and the scannin...

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Abstract

The invention discloses a method for improving a magnesium alloy welded joint through surface microalloying, and belongs to the technical field of welding technologies in material processing. Mixed powder composed of metal powder including Al, Ti, Cr, Mn and Ni and rare earth element powder including Sc and Nd is developed, and a laser microalloying technology is used for conducting surface modification on a magnesium alloy welding seam area to improve the comprehensive performance of the magnesium alloy welded joint, wherein the power comprises the components in percentage by mass: 9.1%-9.4%of Al, 5.4-5.8% of Ti, 4.1-4.3% of Cr, 0.05-0.2% of Mn, 0.03-0.2% of Sc, 0.8%-2.2% of Nd and the balance Ni, and the grain size of laser microalloyed powder is 100-300 meshes. The laser microalloyingtechnology is adopted to obtain a nanophase-containing cladding layer good in performance on the surface of the magnesium alloy welded joint, and rare earth elements, the other alloy elements and a Mgalloy substrate molten layer can generate a large number of alloy compound wild phases and can effectively refine a microstructure of the cladding layer, improve the mechanical performance of the magnesium alloy welded joint and greatly improve the corrosion resistance performance of the magnesium alloy welded joint.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy welding, and in particular relates to a method for improving magnesium alloy welding joints by surface microalloying. Background technique [0002] With the development of modern industry, the problems of energy shortage and environmental pollution have become more and more prominent. Lightweight and high-strength materials represented by magnesium alloys have attracted widespread attention. The density of magnesium alloy is between 1.75 ~ 1.90g / cm 3 It is equivalent to 2 / 3 of aluminum, 2 / 5 of titanium, and 1 / 4 of steel. It is the undisputed lightest metal structure material. Magnesium alloy also has the advantages of high specific strength, good impact resistance, and strong radiation resistance, and is known as "the green material of the 21st century" and "the most important commercial lightweight material". [0003] With the gradual expansion of the application range of magnesium allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/05
CPCC22C19/058C23C24/106
Inventor 刘洪涛刘宝新张昌明刘将周吉学林涛刘玉李涛赵静蕊吴建华刘运腾张琳琳
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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