A spatter suppression method for resistance spot welding with piezoelectric drive and active pressure application

A technology of resistance spot welding and piezoelectric drive, applied in resistance welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as poor solder joint formation, increased welding pressure, spattered solder joint strength, etc., to reduce follow-up inspections process, improving accuracy, and reducing spatter defects

Active Publication Date: 2022-03-15
BEIJING UNIV OF TECH
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  • Claims
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Problems solved by technology

In addition, some studies have pointed out that as the welding current increases, the size of the nugget increases. When the current just exceeds the critical point, severe spatter will be generated and the strength of the solder joint will be reduced. If the welding current is further increased, Although the nugget will further increase and show higher strength, the weld joint formation effect is not good; in addition, by increasing the welding pressure, the time for resistance spot welding to reach the critical spatter point can be delayed, which helps to reduce spatter butt welding Effect of nuclear strength

Method used

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  • A spatter suppression method for resistance spot welding with piezoelectric drive and active pressure application

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Embodiment Construction

[0021] Embodiments of the present invention will be specifically described below with reference to the drawings.

[0022] First, the pressure sensor 3 is installed in the cylinder 2 or the electrode arm to measure the electrode pressure, and the output data of the pressure sensor is connected to the port of the control unit 6 through the pressure sensor connection line 9, and the control unit 6 is connected to the industrial computer 7. The piezoelectric actuator control signal output by the software system is connected to the piezoelectric actuator driver 8 through the control power supply 6 , and connected to the piezoelectric actuator 4 through the connecting line 10 . The piezoelectric actuator 4, including but not limited to, is installed in the electrode pressure output shaft through upper and lower bolts.

[0023] Then, turn on the resistance spot welding spatter defect monitoring system in the industrial computer 7, set corresponding parameters and run the system. Aft...

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Abstract

The invention discloses a resistance spot welding spatter suppressing method for piezoelectrically driven active pressure application. By collecting electrode pressure signals during the resistance spot welding process in real time, a system software program can identify early spatter characteristic signals in real time when they are about to occur. Quickly trigger the control unit to send a feedback control signal into the piezoelectric actuator driver, actively control the piezoelectric actuator to do programmable pressure output, and then supplement the spot welding electrode pressure online to suppress spatter. The method realizes the integration of spot welding quality detection and real-time control, suppresses the occurrence of spot welding spatter from the root, ensures the stability of the resistance spot welding process and improves the quality of solder joints.

Description

technical field [0001] The invention relates to a novel piezoelectric-driven active pressure control method for spatter defects in resistance spot welding, which belongs to the field of welding quality monitoring. Background technique [0002] Resistance spot welding is a welding process that melts metal by resistive heat and applies a certain pressure to form the metal. The process involves multiphysics coupling and the welding process is invisible. Resistance spot welding is widely used in the fields of aviation, aerospace, energy, electronics and rail transit because of its high efficiency, low cost, and easy automation. Especially in the automotive industry, it is still the main means of metal connection. A typical car The car body is assembled from 300 to 400 thin plate parts and 3000 to 6000 solder joints. Therefore, the quality of solder joints and subsequent inspection procedures will directly affect the reliability and production efficiency of the welded structure. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/11B23K11/36
CPCB23K11/11B23K11/36
Inventor 陈树君邬娜肖珺卢振洋李天明胡超雄
Owner BEIJING UNIV OF TECH
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