摘要
研究了基于短路时间频数分布图定量分析的稳定性评价方法.以正态概率密度函数对频数分布图进行拟合,求解出正态概率密度函数的峰值高度并多次计算,得出更为可靠的峰值高度均值,以此作为量化频数分布集中程度的指标.为了验证该方法的有效性,进行了CO2电弧焊实测评定试验.采集具有代表性的焊接过程的电压电流信号.先以人工方式评价其稳定性的好坏,然后使用文中方法逐一计算每个焊接过程的稳定性量化指标.经对照该方法与人工定性方法结果一致,可有效实现CO2弧焊过程稳定性的客观化评价.
A method to estimate CO2 arc welding stability was proposed based on quantitative analysis of class frequency distribution of short-circuit time.Normal probability density function was applied in frequency distribution fitting,and the peak height of normal probability density function was obtained.With repeated times of fitting,a more reliable average of peak heights was calculated.The average served as an index to quantify the concentration degree of class frequency distribution.To test the effectiveness of the above method,an experiment on the stability of CO2 arc welding was conducted,in which voltage and current signals in the typical arc welding processes were collected.The stability of the welding processes was firstly evaluated by the artificial approach.Then the new method proposed in this paper was adopted to calculate the quantitative index of stability in every arc welding process.After comparison,it was found that the results obtained by using the new method are consistent with those achieved by the artificial qualitative approach,which showed that the new method positively contributed to the objective evaluation of the stability of CO2 arc welding processes.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第7期43-46,115,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50875088)
广东省科技计划资助项目(2010B010700001)
番禺区科技计划资助项目(2010-Z-22-1)
黄埔区科技计划资助项目(1021)
关键词
CO2弧焊
短路时间
频数分布
定量
稳定性
CO2 arc welding
short-circuit time
class frequency distribution
quantitative
stability
