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Resistance spot welding short-time amplitude modulation control method based on spatter statistical feedback

A technology of amplitude modulation control and resistance spot welding, applied in resistance welding equipment, manufacturing tools, welding equipment, etc., can solve problems such as self-adaptive adjustment of industrial parameters, large size deviation of stamping parts, and oily surface of workpieces, etc., to achieve high-efficiency resistance points Soldering process, reduce frequency, and ensure the effect of solder joint quality

Active Publication Date: 2020-12-04
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual spot welding process is very complicated. With the mass application of new materials and new structures in car body manufacturing, in the actual car body welding process, there are generally large dimensional deviations of stamping parts, impurities such as oil on the surface of the workpiece, and the location of solder joints. Too close to the edge of the workpiece, poor electrode neutrality, electrode end face wear and other working condition fluctuation factors, resulting in severe spot welding spatter and unqualified solder joint quality
Existing spatter control methods mainly rely on off-line process optimization, and do not perform adaptive adjustment of industrial parameters according to real spatter conditions

Method used

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  • Resistance spot welding short-time amplitude modulation control method based on spatter statistical feedback
  • Resistance spot welding short-time amplitude modulation control method based on spatter statistical feedback
  • Resistance spot welding short-time amplitude modulation control method based on spatter statistical feedback

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Embodiment 1

[0027] like figure 2 As shown, it is a short-term amplitude modulation control system for resistance spot welding based on spatter statistical feedback involved in this embodiment, including: a welding current control module 10, a calculation and analysis module 9 and a welding current signal acquisition module 8 respectively connected thereto And the welding process signal acquisition module 7, wherein: the welding current signal acquisition module 8 is connected with the current sensor 4 arranged on the lower electrode and collects the current signal, and the welding process signal acquisition module 7 is respectively connected with a pair of electrodes 1 and 2. The signal acquisition sensors 5 and 6 are connected to collect welding process signals, and the calculation and analysis module 9 performs identification and statistics of spatter conditions according to the welding process signals, forms optimized short-term amplitude modulation process parameters and outputs them ...

Embodiment 2

[0048] The difference from Embodiment 1 is that the welding process signal of this embodiment uses the electrode displacement signal, that is, the displacement signal of the electrode cap during the welding process is collected through the grating displacement sensors connected to the upper and lower electrode rods respectively, and the spot welding spatter identification and identification are carried out. Statistics, the preset threshold A is 8 μm / ms.

[0049] In this embodiment, the total number of solder joints in a batch of welding process is N=30 points, and the preset target range of spatter frequency is a=0, b=0.05; the statistical time of spatter occurrence is t s = m s -2σ s , where: the square average of the non-zero spatter occurrence time in a batch of welding process m s , and the standard deviation σ are: i represents the serial number of this welding process in a batch of welding process, 1≤i≤N, N is the total number of welding times of this batch of weldin...

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Abstract

The invention discloses a resistance spot welding short-time amplitude modulation control method based on spatter statistical feedback. The method comprises the steps that a current time sequence diagram and a process signal time sequence diagram are established according to welding current and process signals collected in real time, spatter recognition is conducted on the process signal time sequence diagram, and the spatter occurrence moment of single-time welding is obtained; then, statistical analysis is conducted on the spatter occurrence time of one batch of welding spots, the spatter occurrence statistical time and the actually-measured frequency are obtained, and short-time amplitude modulation technological parameters are obtained through comparison with a preset spatter frequencyrange and and feature calculation; and iterative optimization is conducted on the current time sequence diagram according to the short-time amplitude modulation technological parameters till the preset spatter frequency range is reached or spatter does not occur, and welding current is set according to the optimized current time sequence diagram to achieve optimized welding. By combining currentdata and historical data, automatic regulation and control of spot welding spatter are achieved, the frequency of spot welding spatter occurrence can be effectively reduced under different plate combinations, different welding processes and different manufacturing working conditions, meanwhile, the welding spot quality is guaranteed, and the reliable and efficient resistance spot welding process is achieved.

Description

technical field [0001] The invention relates to a technology in the field of welding, in particular to a short-time amplitude modulation control method for resistance spot welding based on spatter statistical feedback. Background technique [0002] Resistance spot welding technology has always been the most important joining process in car body manufacturing because of its advantages such as high production efficiency. According to statistics, there are usually 4,000 to 6,000 solder joints distributed on a car body-in-white, accounting for 90% of the total welding volume of the vehicle. Spatter is the most common defect in resistance spot welding. On the body-in-white welding production line, spatter occurs frequently, and the spatter rate (occurrence probability) of some stations can be as high as 80%. However, the actual spot welding process is very complicated. With the large-scale application of new materials and new structures in the body manufacturing process, in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/36G06F17/18
CPCB23K11/11B23K11/36G06F17/18
Inventor 夏裕俊沈衍楼铭雷海洋李永兵
Owner SHANGHAI JIAO TONG UNIV
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