共查询到18条相似文献,搜索用时 125 毫秒
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根据焊丝干伸长传感器的特点 ,建立了以MOTOROLAMC6 8HC11A1单片机为主控CPU的波控短路过渡CO2 焊接焊矩高度实时跟踪控制系统。通过对短路期间焊丝干伸长的实时检测与处理 ,采用合理的控制系统结构 ,实现了短路过渡CO2 焊接焊矩高度实时而精确的控制。并在不同的条件下 ,对控制系统的性能进行了试验研究 ,试验结果表明 ,系统的稳态和动态性能良好 ,可以实现不同倾斜角度、不同送丝速度和不同焊接速度下焊矩高度的实时跟踪控制。焊矩高度实时控制的实现 ,保证了焊接过程的稳定性 ,改善了焊接质量 相似文献
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研究并提出了一种CO2气体保护焊电流波形的多参数自寻优智能控制法,电流波形的模糊寻优计及弧焊过程特征参数的综合影响,并在表征短路过渡综合性能的特征综合值作为弧焊过程定量评价和目标实时寻优的函数。在波控参数基值的基础上,基于综合性能寻优过程采用三级模糊调节算法,对电流波形参数分步调节寻优。该法实际上将双输入三输出式的波控参数模糊控制系统化为多路,开关性的双输入单输出式的模糊控制,通过短路及燃弧初始阶段的电流波形控制参数的模糊自寻优,逐步使波控参数和焊接规范参数达到和谐匹配,以实现焊接过程熔滴的稳定可控过渡,改善焊接过程的综合性能。 相似文献
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电压近似熵-SVM铝合金双丝PMIG焊过程稳定性评价 总被引:2,自引:2,他引:0
提出了弧压信号近似熵-支持向量机(support vector machine,SVM)算法来评价铝合金双丝脉冲熔化极惰性气体保护(pulse metal insert gas,PMIG)焊焊接过程稳定性,并经试验验证该方法具有可行性和一定的可靠性.铝合金双丝PMIG焊电流、电压信号近似熵值越大对应焊接过程越不稳定,且相比于电流近似熵值,电压近似熵值能更加明确的表现焊接过程稳定性的差异,所以选取电压近似熵值进行SVM分类.结果表明,文中数据情况下,训练数据集在20%以上时分类准确率均在90%以上,且训练数据越充足分类结果越准确. 相似文献
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1 INTRODUCTIONCO2 shieldedarcweldingisoneoftheweldingtechnologieswithhigherefficiency ,lowerenergyconsumption ,lesshydrogencontentandhighanti ox idationability .Theshort circuittransferisamainforminCO2 arcweldingprocess ,butithastoomuchspattering ,andunsatisf… 相似文献
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A self-developed welding dynamic arc wavelet analyzer was adopted to analyze and assess the welding process of two CO2 arc welding machines. The experimental results indicate that the instantaneous energy can reflect the influence of the welding current and voltage on dynamic arc characteristic synthetically. Through calculating and analyzing the instantaneous energy, the energy during arc ignition and short circuit in CO2 welding process can be confirmed rationally, thus the foundation for the accurate design and control of the welding current and voltage can be provided. By reducing the ripple disturbance of the dynamic resistance, avoiding peak current and voltage waveform,and enhancing the transition frequency of short circuit suitably, the stability of the welding arc and the weld appearance can be improved. 相似文献
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IGBT逆变式波形控制CO2弧焊电源的研究 总被引:5,自引:2,他引:5
本文针对IGBT弧焊逆变器,提出并实现了适于短路过渡CO_2气体保护焊的输出波形控制方法。对焊接电弧参数实时采样以及工艺试验均表明,所研制的逆变式波控CO_2弧焊电源对减小金属飞溅和改善焊缝成型均有明显效果。 相似文献
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对于逆变弧焊电源,采用基于 DSP 的全数字控制策略.针对短路过渡 CO2 气体保护焊特点,提出了准恒压全数字化新型波形控制策略,不再根据输出电压区分短路和燃弧过程,使得短路和燃弧过程过渡自然,适应于所有的焊接工艺,提高了系统的适应性.同时在短路初期采用瞬态电流抑制技术减少了飞溅,建立了包含实时燃弧能量补充机制的全数字化电压电流瞬时反馈的全数字三闭环控制模型.结果表明,所提出的全数字化软开关控制策略灵活、可靠;所采用的数字波形控制技术适应性好、灵活、焊接过程稳定、焊缝成形优良.Abstract: According to the characteristics of short circuit transfer of CO2 gas metal arc welding, a novel full digital waveform control scheme called quasi-constant voltage control is presented for inverter type arc welding power based on DSP. Short circuit and arc ignition process are not judged according to the output voltage and transfer process between them is smooth. The strategy is also applied to all welding conditions. Initial current at the instant of short-circuit is suppressed to reduce spatter generation. A triple closed loop control model including real time energy compensation for the arc state based on instantaneous voltage and current feedback control is estabhshed. Flexibility and reliability of the proposed fully digitalized softswitching control strategy is validated by experimental results of 400 A welding machine. The experimental results show that proposed digital waveform control scheme is applicable for different wire feeding speed conditions, and the welding process is stable and the welding bead appearance is good. 相似文献