Adaptive Control Research and Quantitative Evaluation of Resistance Spot Welding Expulsion Based on Electrode Displacement

被引：0
|
作者：
Li H. [1 ]
Lyu T. [1 ]
Xia Y. [1 ]
Li Y. [1 ]
机构：
[1] Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2022年 / 33卷 / 09期
关键词：
Abnormal condition; Adaptive control; Displacement signal; Resistance spot welding;
D O I：
10.3969/j.issn.1004-132X.2022.09.002
中图分类号：
学科分类号：
摘要：
Expulsion was a common problem in resistance spot welding, which seriously affected the welding quality. Aiming at the typical abnormal conditions, through the quantitative analysis of expulsion metals and expulsion sudden stop experiments, it is shown a strong linear correlation between the sudden of electrode displacement signal and the total mass of expulsion metals is found, and the sudden of electrode displacement signals is basically the same as the reduction of nugget thickness before and after expulsions. Therefore, the sudden of electrode displacement signals may characterize the degree of expulsion. Based on this, the adaptive control strategy of spot welding expulsion was proposed based on quantitative statistics. The fuzzy control strategy was formulated with expulsion degree and expulsion probability as inputs and current amplitude modulation parameters such as amplitude modulation coefficient, amplitude modulation time and amplitude modulation duration time as outputs. The time compensation parameters such as time compensation length and time compensation current were determined according to the time compensation strategy of constant energy and constant power. The effectiveness of the strategy was verified by using two kinds of strength sheets. Experimental results show that compared with constant current welding, the method herein may effectively suppress expulsion, reduce indentation depth and increase nugget diameter. Compared with the traditional short-time current amplitude modulation strategy, the method reduces the number of amplitude modulation and the time of time compensation, and effectively improves the welding efficiency. © 2022, China Mechanical Engineering Magazine Office. All right reserved.
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页码：1025 / 1033
页数：8
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