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

7 Cites 17 Cited by

AI-Extracted Technical Summary

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...

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.

Application Domain

Welding/cutting auxillary devicesArc welding apparatus +2

Technology Topic

PeeningCrystallite +9

Image

Examples

Experimental program(1)

Example Embodiment

[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, the wire feeding speed is 5m/min, and the overall walking speed of the welding torch is 8mm/min. s , the gas flow rate is 20L/min;

[0019] Place the ultrasonic impact machine (gun) produced by Tianjin Tiandongheng Technology Development Co., Ltd. behind the CMT welding torch to perform ultrasonic impact on the formed aluminum alloy test piece, and adjust the frequency to 18kHz; use multiple rows of multi-needle impact heads to impact the weld seam Surface, during the impact process, the gun head is perpendicular to the surface of the joint to ensure that the formed surface is completely impacted (for details of the ultrasonic impact gun, see Chinese patents 2013102016550, 200610014768X).

[0020] The specimens manufactured by CMT arc additives alone and the specimens manufactured by CMT-ultrasonic impact composite additives were cut by wire cutting for comparison, including: (1) Ultrasonic impact (CMT-ultrasonic impact) on the formed surface Composite additive manufacturing) were compared with specimens without ultrasonic shock at all (CMT arc additive manufacturing). (2) CMT-ultrasonic shock composite additive manufacturing was performed on only one side, compared with the other side of CMT arc additive manufacturing alone. After grinding and polishing, observe the pores and the morphology of the cross-section of the specimen under an optical microscope, as shown in the attached Figure 2-4 As shown, due to the ultrasonic impact, the surface of the specimen undergoes plastic deformation, and the pores inside the specimen (at a certain distance from the surface of the specimen) are squeezed, resulting in a smaller volume of the pores or elimination of the pores.

[0021] In the present invention, magnesium alloy AZ31 and titanium alloy TA15 are selected as the experimental substrates for metal arc additive manufacturing, and the same test dimensions, parameters and equipment as the above-mentioned aluminum alloys are used for experiments, and the results obtained are the same as the above-mentioned experimental results.

[0022] The present invention has been described as an example above, and it should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacements that can be made by those skilled in the art without creative labor all fall within the scope of this invention. protection scope of the invention.

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