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A Laser Cladding Forming Powder for Improving Magnesium Alloy Welded Joints

A technology of welded joints and laser cladding, which is applied in the coating process and coating of metal materials, can solve the problems of poor mechanical properties of welded joints, restricting the engineering application of magnesium alloys, and the difficulty of magnesium alloy welding, so as to improve the physical properties , Improve the tensile strength and improve the effect of mechanical properties

Active Publication Date: 2020-03-17
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 Laser Cladding Forming Powder for Improving Magnesium Alloy Welded Joints
  • A Laser Cladding Forming Powder for Improving Magnesium Alloy Welded Joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Firstly, automatic argon arc butt welding is performed on AZ31B magnesium alloy rolled plates:

[0035] (1) The thickness of AZ31B magnesium alloy rolled plate is 3mm, and the size is 50×110mm;

[0036] (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;

[0037] (3) if figure 1 Laser cladding is performed on the weld seam and heat-affected zone of the AZ31B magnesium alloy welding joint shown in the figure; the laser cladding process is as follows: the laser cladding adopts the pre-synchronous powder feeding method, the cladding process is protected by inert gas, and the end of the nozzle is connected to the surface of the base metal The distance is 2cm, the powder feeding diameter is 3mm, the angle between the powder feeding nozzle and the base metal is 60°, argon is used for carrier gas and gas protection, and the flow rat...

Embodiment 2

[0043] First of all, laser butt welding is performed on the AM60 magnesium alloy rolled plate:

[0044] (1) The thickness of AM60 magnesium alloy rolled plate is 4mm, and the size is 60×120mm;

[0045] (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;

[0046] (3) if figure 1 Laser cladding is performed on the weld seam and heat-affected zone of AM60 magnesium alloy welding joint shown in the figure; the laser cladding process is as follows: the laser cladding adopts the pre-synchronous powder feeding method, the cladding process is protected by inert gas, and the end of the nozzle is connected to the surface of the base metal The distance 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 c...

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Abstract

The invention relates to powder formed by laser cladding for improving magnesium alloy welding joints, and belongs to the technical field of welding processes in the material machining. Mixed clad powder contains WC, TiC, B4C, Al2O3, TiO2, TiN ceramic powder and metal Ni; and the powder comprises the following components in percentage by mass: 0.001-4.5% of WC, 0.7-2.1% of TiC, 1.5-3.2% of B4C, 4.2-6.7% of Al2O3, 5.4-7.8% of TiO2, 6.3-8.4% of TiN, and the balance of Ni. The particle size of the laser clad powder is 50-200 microns. Nanometer phase-contained clad layers with excellent performances are formed on the surfaces of the magnesium alloy welding joints by adopting a laser cladding technology; and through the clad layers, the mechanical performances and the wear resistance of the magnesium alloy welding joints can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy welding, and in particular relates to a laser cladding forming powder for improving magnesium alloy welding joints. Background technique [0002] Energy shortage and environmental pollution are prominent problems in today's world. Lightening one's own weight has become an effective way to reduce environmental pollution and save energy in the fields of automobiles and aerospace. According to statistics, for every 100 kg reduction in vehicle quality, fuel consumption can be reduced by 0.7 liters. In aerospace vehicles, the reduction in the weight of structural parts leads to a reduction in fuel costs, which is 100 times that of the automotive industry. High specific strength, specific stiffness, excellent electromagnetic shielding performance and strong radiation resistance make magnesium alloys widely used in the fields of aviation, aerospace, electronics, automobiles and national defense,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/03C22C32/00
CPCC22C19/03C22C32/0005C23C24/103
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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