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CMT-ultrasonic vibration composite additive manufacturing method

A technology of additive manufacturing and ultrasonic vibration, applied in the direction of manufacturing tools, additive processing, arc welding equipment, etc., can solve the problems of reducing the performance of metal additive manufacturing components, reducing the effective bearing area of ​​formed components, and stress concentration.

Inactive Publication Date: 2019-11-22
TIANJIN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using CMT welding technology for arc additive manufacturing of metal components, the structure of the components is generally loose, especially in the aluminum / magnesium alloy formed components, more pores will be formed, which will not only reduce the effective bearing area of ​​the formed components, but also It is also easy to cause stress concentration, thereby reducing the performance of metal additive manufacturing components

Method used

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Experimental program
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Embodiment Construction

[0018] Further illustrate technical scheme of the present invention below in conjunction with specific embodiment:

[0019] The metal arc additive manufacturing test substrate involved in the present invention is aluminum alloy 6061, the size of the substrate is 300×150×4mm, and the welding wire is ER4043. The direct current cold metal transfer technology (cold metal transfer, CMT) was used to conduct the experiment of arc additive manufacturing of aluminum alloy. The CMT welder used for the test is the CMT Advanced 4000 welder from Fronius.

[0020] Table 1 Material Composition List

[0021]

[0022] Before the test, use a wire brush to remove the oxide film on the aluminum alloy substrate until the metallic luster is exposed, and use alcohol to clean the oil and dirt in the welding range. After the oxide film is removed, welding should be performed within 2 hours to avoid regeneration. New oxide film; set the welding parameters, the average current is 85A, the average v...

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Abstract

The invention discloses a CMT-ultrasonic vibration composite additive manufacturing method. A substrate is ultrasonically vibrated when CMT arc additive manufacturing is performed. After ultrasonic vibration, a fine and uniform component with a non-dendritic structure can be obtained. Under the cavatition and the acoustic streaming effect of ultrasonic vibration, a molten pool is ultrasonically vibrated before solidification, a large amount of fine bubble cores are generated, and the fine bubble cores are reserved to form a core-forming core, so that a solidification structure is refined; andduring the solidification process, the dendritic crystals are broken due to the ultrasonication, so that a fine and uniform structure is formed, and the mechanical property of the component is effectively improved.

Description

technical field [0001] The invention relates to the field of arc additive manufacturing, and more specifically, relates to a CMT-ultrasonic vibration composite additive manufacturing method. Background technique [0002] Cold metal transfer (CMT) technology is a low heat input welding process successfully developed by Austrian Fronius company on the basis of steel and aluminum welding, spatter-free arc ignition technology and micro-joint technology. The innovation of CMT technology lies in the combination of droplet transfer and wire feeding process to achieve no spatter in the welding process; due to the effective control of the droplet transfer process, the arc additive manufacturing of metal components can be realized while reducing the welding heat input shaping control. Additive manufacturing (AM) technology is a technology that manufactures solid parts by accumulating materials layer by layer. Compared with traditional cutting technology, it is a bottom-up material ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B33Y10/00
CPCB23K9/04B33Y10/00
Inventor 胡绳荪田银宝申俊琦勾健王万东
Owner TIANJIN UNIV
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