On-line monitoring method of resistance spot welding quality

A technology of resistance spot welding and dynamic resistance curve, which is applied to measuring devices, instruments, etc., to achieve the effect of improving accuracy

Active Publication Date: 2016-08-17
JILIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of online monitoring method of resistance spot welding quality, solve the problem existing in existing spot welding quality monitoring technology, establish multiple process parameters and derivatives in the actual production process of resistance spot welding to reflect the spot welding heat process change The relationship between dynamic resistance information and spot welding quality

Method used

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  • On-line monitoring method of resistance spot welding quality
  • On-line monitoring method of resistance spot welding quality
  • On-line monitoring method of resistance spot welding quality

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Embodiment

[0101] This embodiment takes SUS301-HT, 1+1mm stainless steel plate single-current pulse welding as an example, the spot welding process is: welding current 7KA, electrode pressure 9KN, welding energization time 8cyc (per cycle is 20ms).

[0102] see figure 1 As shown, it is the flow chart of data acquisition and data processing in the present invention. First start the program, and set the spot welding welding parameters according to the actual welding process specification (including: welding current I is 7KA and its power-on time t is 8cyc, electrode pressure P is 9KN) and its allowable range (the allowable upper and lower ranges are respectively 90% and 110% of the set welding parameters); in addition, set other relevant spot welding process information, such as material type SUS301-HT stainless steel, plate thickness 1+1mm, etc. After the setting is completed, Start the welding equipment for data collection.

[0103] During signal collection, the welding signal is automa...

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Abstract

The invention relates to an online monitoring method for resistance spot welding quality and belongs to the field of resistance spot welding quality monitoring techniques. At first, the welding current and inter-electrode voltage for resistance spot welding are collected in real time in the actual production process of resistance spot welding, a dynamic resistance curve is worked out, according to the welding process application principle in actual production, namely a qualified welding spot is a great probability event, a system carries out modeling sample capacity estimation according to the principle of statistics, cluster analysis is conducted on the dynamic resistance curve, and the qualification probability of a new welding spot is predicted according to the analysis result. Modeling is not needed under a specific welding process condition, an automatic modeling mode has the characteristic of universality, welding production data are directly adopted for modeling, and therefore the online monitoring method is more suitable for actual production and greatly improves online monitoring accuracy.

Description

technical field [0001] The invention relates to the technical field of resistance spot welding quality monitoring, in particular to an on-line monitoring method for resistance spot welding quality. By monitoring multiple inherent process parameters and the derived dynamic resistance information in the actual production process of resistance spot welding, in the grid coordinate system, based on the cluster analysis method of the average distance of the dynamic resistance curve and the statistical probability density method, the online evaluation of automatic modeling is realized Spot welding quality. Background technique [0002] Resistance spot welding is widely used in aviation, aerospace, automobile manufacturing and other technical fields. However, due to many interference factors affecting the spot welding process, it is easy to lead to unstable welding quality. Therefore, welding quality monitoring is an important method to ensure welding quality. [0003] Since the qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02
Inventor 徐国成范秋月谷晓鹏周广浩
Owner JILIN UNIV
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