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A method for improving the metallurgical strength of aluminum alloy arc-added materials

A technology of aluminum alloy and aluminum alloy components, which is applied in the field of additive manufacturing, can solve the problems of affecting the metallurgical bonding strength of parts, serious heat accumulation of stacked parts, and decline of mechanical properties of parts, so as to achieve shortened production cycle, high material utilization rate, melting deep increasing effect

Active Publication Date: 2021-09-07
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the arc additive manufacturing process is realized by stacking layers. As the number of layers increases, the heat accumulation of the stacked parts is serious, the heat dissipation conditions between layers are poor, and the molten pool is overheated. This problem directly affects the metallurgical bonding strength of the parts.
At the same time, in the aluminum alloy arc additive process, since the solubility of hydrogen in liquid aluminum is very high, and the solubility in solid aluminum is almost zero, when the molten pool cools to the solidification temperature, the solubility of hydrogen drops extremely, and it is too late to precipitate a large amount of hydrogen. Escaping will form a large number of hydrogen pores in the aluminum alloy, resulting in a decrease in the mechanical properties of the part

Method used

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  • A method for improving the metallurgical strength of aluminum alloy arc-added materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Polish the surface of the pickled 20mm thick 5A06 substrate with a winch grinder to expose the bright white metal and wipe it clean with acetone or absolute ethanol.

[0043] (2) Fix the base plate on the workbench to ensure that the base plate is within the travel range of the robot.

[0044] (3) 99.999% high-purity argon is used for frontal protection, and the flow rate is 18-20L / min.

[0045] (4) Select a suitable position on the base plate as the arc starting point to lay the bottom three layers. The mode is C+P (mixed transition form of CMT transition and pulse transition), and the welding current is 20A to 50A larger than the forming current of the upper layer (that is, the additive current). Left and right, the surface of the base layer is shaped wider and flat, so that the upper layer can be completely flat on the surface of the base layer.

[0046] (5) After priming, select a suitable arc starting point. The arc starting point is the two ends of the straig...

Embodiment 2

[0056] In step (5), the additive current is 100A, the wire feeding speed is 7m / min, and the traveling speed of the welding torch is 8mm / s.

[0057] Make the welding torch swing during the additive process, see the swing mode figure 1 , the amplitude W=2mm, the time to travel forward at the maximum amplitude position is 0.2s, the time to travel forward at the maximum amplitude position is 0.2s, the travel distance of the welding torch at the wave peak L1=0.2×8=1.6mm, the welding torch The travel distance L2 at the trough is 0.2×8=1.6mm, and the length of one cycle of oscillation is L=1.6+1.6+0.2×8=4.8mm.

[0058] The single-layer cladding layer has a height of 1.2mm and a width of 10mm.

[0059] The additive mode is C+P mode (cold metal transfer process and pulse mixed transfer method). The transition mode is the same as Example 1.

[0060] The operation mode of the mechanical arm is linear reciprocating operation. Such reciprocating forming produces an aluminum alloy strai...

Embodiment 3

[0063] In step (5), the additive current is 100A, the wire feeding speed is 9m / min, and the traveling speed of the welding torch is 11mm / s.

[0064] Make the welding torch swing during the additive process, see the swing mode figure 1 , the amplitude W=5mm, the time to travel forward at the maximum amplitude position is 0.2s, the time to travel forward at the maximum amplitude position is 0.2s, the travel distance of the welding torch at the wave peak L1=0.2×11=1.1mm, the welding torch The travel distance L2 at the trough is 0.2×11=1.1mm, and the length of one cycle of oscillation is L=1.1+1.1+0.1×11=3.3mm.

[0065] The single-layer cladding layer has a height of 1.2mm and a width of 10mm.

[0066] The additive mode is C+P mode (cold metal transfer process and pulse mixed transfer method). The transition mode is the same as Example 1.

[0067] The operation mode of the mechanical arm is linear reciprocating operation. Such reciprocating forming produces an aluminum alloy s...

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Abstract

The invention discloses a method for improving the metallurgical strength of aluminum alloy arc additive materials, comprising: pre-planning an additive path according to the shape of an aluminum alloy component; Swing on the plane, the swing trajectory is formed by connecting the end to end of a plurality of repeating units in turn, and the repeating unit is formed by connecting two isosceles trapezoidal trajectories distributed on both sides of the axis. two isosceles trapezoidal trajectories are centrally symmetrical with respect to the joint point; the amplitude of the swinging trajectories is 2-5 mm, and the welding torch travels at the two maximum amplitude positions of the repeating unit The time for each repeating unit is 0.1-0.2 s, and the time used by the welding gun to form each repeating unit is 0.3-0.6 s. The formed aluminum alloy components manufactured by the invention have good metallurgical bonding performance, and the strength can be increased to more than 90% of the parent material.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a method for improving the metallurgical strength of aluminum alloy arc additive metallurgy. Background technique [0002] In the field of additive manufacturing, the additive manufacturing technology of metal parts using arc as a heat source has the advantages of simple equipment, high material utilization rate, and high production efficiency. The arc additive manufacturing technology uses an electric arc as a heat source to melt the metal wire, and accumulates layers on the substrate according to the set forming path, until the metal parts are formed. Therefore, arc additive technology is an important research direction for direct manufacturing of low-cost metal parts. Among them, aluminum alloy materials have been widely used in the manufacture of aerospace products, which can effectively reduce product weight and improve product flight performance. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/04B23K9/12B23K9/32B23K35/28
CPCB23K9/04B23K9/12B23K9/32B23K35/286
Inventor 胡洋步贤政顾文婷曲宏韬韩铁
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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