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CMT-ultrasonic peening composite additive manufacturing method

An ultrasonic impact, additive manufacturing technology, applied in manufacturing tools, auxiliary devices, arc welding equipment, etc., can solve problems such as reducing the performance of metal additive manufacturing components, stress concentration, and reducing the effective bearing area of ​​forming components

Inactive Publication Date: 2018-05-25
TIANJIN UNIV
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Problems solved by technology

However, when using CMT welding technology for arc additive manufacturing of metal components, the structure of the formed components is generally loose, especially in the formed components of aluminum / magnesium alloys, 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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Embodiment Construction

[0016] Further illustrate technical scheme of the present invention below in conjunction with specific embodiment:

[0017] The metal arc additive manufacturing experiment substrate involved in the present invention is aluminum alloy 6061, the substrate size 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 welding machine selected as the test equipment is the CMT Advanced4000 welding machine of Fonius Company.

[0018] 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 on the surface of the welding place within about 30-40mm. After the oxide film is removed, it should be cleaned within 2 hours. Welding is performed internally to avoid regenerating a new oxide film; set the welding parameters, ...

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Abstract

The invention discloses a CMT-ultrasonic peening composite additive manufacturing method. The surface of a formed component is subject to ultrasonic peening treatment while CMT electric arc additive manufacturing is carried out, the surface of the component has plastic deformation, internal air holes are extruded while the texture of the formed component is compact, and the air hole size is decreased or eliminated; and meanwhile, part of action energy of ultrasonic peening is transmitted to a CMT liquid state molten bath through the component, solubility of bubbles into molten bath liquid is reduced, the floating speed of the bubbles is increased, time of the bubbles in the molten bath is shortened, and the number and size of air holes in the formed component are reduced; and meanwhile, through ultrasonic peening, the surface of a welding joint has obvious plastic deformation, the close-surface layer microstructure is broken, and grains on the surface of the joint are refined.

Description

technical field [0001] The invention relates to the field of arc additive manufacturing, in particular to a CMT-ultrasonic impact 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 the droplet transfer and the wire feeding process to truly realize spatter-free welding; 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 accumulating manufact...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K37/00
Inventor 胡绳荪田银宝申俊琦王志江
Owner TIANJIN UNIV
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