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Ultrasound-assisted resistance spot-welding device and method used for sheet metal materials

A resistance spot welding and ultrasonic-assisted technology, applied in the field of welding manufacturing, can solve problems such as large changes, electrode wear, and complicated devices, and achieve the effects of small ultrasonic vibration resistance, promotion of mass transfer and heat transfer, and high method adaptability.

Inactive Publication Date: 2019-07-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there have been reports on the introduction of ultrasound into resistance spot welding: Chinese patent application number 201510096036.9, coaxial ultrasonic-assisted resistance spot welding device and method, using an annular ultrasonic tool head coaxial with the resistance spot welding electrode to achieve ultrasonic-resistance points Welding combination, the original resistance spot welding equipment has been greatly changed, which increases the complexity of the device, and the ultrasonic vibration can only be applied vertically or parallel to the workpiece to be welded
The Chinese patent with the application number 201510357883.6 is an ultrasonic-resistance hybrid welding method, which achieves the composite ultrasonic-resistance welding by directly applying ultrasonic vibration on the spot welding electrode. The disadvantage of this design is that the electrode pressure during spot welding is serious. The ultrasonic vibration of the electrode is hindered, and the high-speed vibration of the electrode may aggravate the wear of the electrode
[0004] In summary, the existing ultrasonic-assisted resistance spot welding method has the problems of complex equipment and low utilization rate of ultrasonic vibration. Therefore, it is necessary to invent an ultrasonic-assisted resistance spot welding device with simple equipment, easy implementation and effective use of ultrasonic vibration. and method

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  • Ultrasound-assisted resistance spot-welding device and method used for sheet metal materials
  • Ultrasound-assisted resistance spot-welding device and method used for sheet metal materials
  • Ultrasound-assisted resistance spot-welding device and method used for sheet metal materials

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Experimental program
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Effect test

Embodiment 1

[0035] In the ultrasonic-assisted resistance spot welding device of this embodiment, the diameters of the upper electrode 1 and the lower electrode 4 are both 8 mm. The ultrasonic tool head 6 has a diameter of 5 mm, and is in contact with the workpiece at a position 10 cm away from the axis of the lower electrode 4 . The distance between the ultrasonic tool head 6 and the lower electrode 4 can effectively ensure that the ultrasonic energy acts on the nugget without interference between the ultrasonic tool head 6 and the lower electrode 4 . According to different welding materials, the end face of the ultrasonic tool head 6 can be flat or provided with patterns or micro-teeth, so as to ensure effective transmission of ultrasonic vibrations. The angle between the ultrasonic tool head 6 and the workpiece to be welded can be between 0° and 90°.

[0036] The ultrasonic generator 8 and the transducer 7 are commonly used devices in the field of ultrasonic waves, which generate reson...

Embodiment 2

[0048] In this embodiment, the same ultrasonic-assisted resistance spot welding device as in Embodiment 1 is used to spot weld two 6061 aluminum alloy plates with a thickness of 1 mm. The specific operation steps are as follows:

[0049] 1) Preloading stage:

[0050] The upper electrode 1 exerts a pressure of 1.2kN on the upper plate 2 of the workpiece to be welded under the control of the pressure device Ⅰ, adjust the limit device 5 to make it contact the upper plate 2, and the ultrasonic tool head 6 exerts pressure on the welded workpiece under the control of the pressure device II. The lower plate 3 of the part applies a pressure of 50N, so that the resistance spot welding electrode and the ultrasonic tool head are in close contact with the workpiece to be welded. Keeping the pressure of the upper resistance spot welding electrode 1 and the ultrasonic tool head 6, turn on the ultrasonic generator 8 to make the ultrasonic tool head 6 vibrate, the ultrasonic vibration frequen...

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Abstract

The invention discloses an ultrasound-assisted resistance spot-welding device and method used for sheet metal materials, and belongs to the technical field of welding manufacturing. The ultrasound-assisted resistance spot-welding device comprises a resistance spot-welding electrode and an ultrasonic tool head located on one side of the resistance spot-welding electrode. The distance from the axisof the ultrasonic tool head to the axis of the spot-welding electrode is 2-15cm. The ultrasound-assisted resistance spot-welding method comprises the steps that (1) an electrode pressure is applied toclamp a welded workpiece, and the ultrasonic tool head is closely attached to the welded workpiece through a pressurization device, and an ultrasonic generator is started; (2) a resistance spot-welding power supply is turned on to output currents to form a spot-welding nugget; (3) output of the currents is stopped, and the welded workpiece is cooled and crystallized under the combined effect of the electrode pressure and ultrasonic vibration; and (4) after output of the currents is stopped for 50-200s, the ultrasonic generator is stopped. According to the ultrasound-assisted resistance spot-welding device and method, original resistance spot-welding equipment is not changed, and ultrasounds are directly applied to the welded workpiece; and after welding, the structure of the nugget is refined, and the porosity is reduced; and high-quality spot-welding connection of lightweight metal materials such as aluminum alloy is achieved.

Description

technical field [0001] The invention relates to the field of welding manufacturing technology, in particular to an ultrasonic-assisted resistance spot welding device and method for sheet metal materials. Background technique [0002] The resistance spot welding technology of sheet metal materials has become one of the most widely used welding methods in aerospace, automobile manufacturing, rail transit and other fields due to its advantages of high efficiency, low cost, and high degree of automation. However, for lightweight metal materials such as aluminum alloys, magnesium alloys, and titanium alloys, the quality of solder joints is one of the bottlenecks that limit their large-scale applications. Lightweight metal materials contain more alloying elements, and the surface is easy to oxidize. During the resistance spot welding process, the metal in the nugget area melts and solidifies rapidly, resulting in a large solidification shrinkage stress in the nugget and the compos...

Claims

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Application Information

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IPC IPC(8): B23K28/02
CPCB23K28/02
Inventor 阚盈吴昌忠陈怀宁陈静姜云禄李东旭
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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