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Method for improving abrasive resistance of aluminum alloy cold metal transfer (CMT) welding head

An aluminum alloy and wear resistance technology, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of poor wear resistance, limited application range of mechanical components, and low hardness of aluminum alloys, and achieve the effect of improving wear resistance.

Inactive Publication Date: 2018-12-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low hardness and poor wear resistance of aluminum alloy, its application range as a mechanical component is limited.

Method used

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  • Method for improving abrasive resistance of aluminum alloy cold metal transfer (CMT) welding head
  • Method for improving abrasive resistance of aluminum alloy cold metal transfer (CMT) welding head
  • Method for improving abrasive resistance of aluminum alloy cold metal transfer (CMT) welding head

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] figure 1 Schematic diagram of ultrasonic vibration aluminum alloy CMT welding process. Such as figure 1 As shown, in the welding process, the impact position of the impact needle remains unchanged, and the shortest distance between the impact needle and the welding torch is 80mm. The test base material involved in the present invention is aluminum alloy 6061, the specification of the test piece is 300×150×4mm, and the welding wire is ER4043. A plate surfacing test was carried out on an aluminum alloy with a plate thickness of 4 mm using DC cold metal transfer technology CMT. The CMT welding machine selected as the test equipment is the CMTAdvanced 4000 welding machine of Fonius Company, and the ultrasonic impact machine produced by Tianjin Tiandongheng Technology Development Co., Ltd. is selected as the ultrasonic impact machine.

[0022] Its main implementation steps are as follows:

[0023] 1. Before the surfacing test, use a wire brush to remove the oxide film on...

Embodiment 2

[0036] The experimental base material involved in the present invention is aluminum alloy 6061, the specification of the test piece is 300×150×4mm, and the welding wire is ER4043. A plate surfacing test was carried out on an aluminum alloy with a plate thickness of 4mm using the direct current cold metal transfer technology CMT (cold metal transfer). The CMT welder used for the test is the CMT Advanced 4000 welder from Fronius. Its main implementation steps are as follows:

[0037] 1. Overlay welding test. Before overlay welding, remove the oxide film on the aluminum plate with a wire brush until the metallic luster is exposed. Use alcohol to clean the oil and dirt on the surface of the welding place within about 30-40mm, and remove the oxide film. After that, welding should be applied within 2 hours to avoid the formation of new oxide film;

[0038] 2. Set the welding parameters, the wire feeding speed is 5m / min, the overall walking speed of the welding torch is 30cm / min, a...

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Abstract

The invention discloses a method for improving abrasive resistance of an aluminum alloy cold metal transfer (CMT) welding head. Ultrasonic impact is combined in aluminum alloy CMT, or in the aluminumalloy CMT welding process, an aluminum plate is impacted by an ultrasonic impact device, the stirring effect on liquid metal in welding is achieved, dendrite branches of dendrites are bent and then broken advantageously under the effect of the alternating torque, joint grains are refined, and thus the abrasive resistance of a joint is improved; or the joint is subjected to ultrasonic impact treatment after welding, air holes in the joint are reduced, the compactness of the joint is increased, meanwhile grains on the surface of a weld seam are refined, and thus a nanolayer is generated.

Description

technical field [0001] The invention belongs to the field of welding technology, and more specifically, uses ultrasonic shock to improve the wear resistance of aluminum alloy CMT welded joints through the method of ultrasonic vibration. Background technique [0002] Cold metal transfer technology (Cold Metal Transfer, CMT) is a welding technology with low heat input developed by Austrian company Fronius 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, so as to realize spatter-free welding and reduce the heat input in the welding process. Hot cracks are generated, so CMT technology is suitable for aluminum alloy welding. Due to its light weight, good thermal conductivity and certain corrosion resistance, aluminum alloy is widely used in the automobile industry and machine manufacturing industry to make parts used u...

Claims

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Application Information

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IPC IPC(8): C22F3/00C21D9/50
CPCC21D9/50C22F3/00
Inventor 胡绳荪田银宝申俊琦白鹏飞
Owner TIANJIN UNIV