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	Secondary inverter topologies of the variable polarity GTAW power supply and their relevant control strategies
	Chen Jie ; Zhu Zhi-ming
	2010-10-12 ; 2010-10-12
关键词	Practical/ arc welding bridge circuits commutation invertors welding equipment/ secondary inverter topology variable polarity GTAW power supply arc stability current commutating process GTAW welding process gas ionization degree arc zone polarity exchange current zero-crossing full-bridge topology half-bridge topology/ B8620 Power applications in manufacturing industries B0170G General fabrication techniques B0170S Control equipment and processes in production engineering B8360 Power convertors and power supplies to apparatus C3355F Control applications in assembling E1520E Joining processes and welding E1550 Control technology and theory E2310 Power and plant engineering (mechanical engineering) E1560 Production equipment
中文摘要	During the variable polarity GTAW welding process, it is the key to maintain and improve the arc stability. Referring to a variable polarity GTAW welding power supply with two stage inverters, the secondary inverter topologies and their relevant control strategies have greatly influence on the characteristics of the output current commutating process and the arc stability. In this paper, the arc stabilizing mechanism of variable polarity GTAW welding process is analyzed, and then the methods to maintain and improve the arc stability are proposed. By increasing the commutation rate of output current, the temperature and the degree of gas ionization in arc zone can be held when current zero-crossing. In the case of welding with a small current, the temperature and the degree of gas ionization can even be increased by adding a current pulse just before the polarity exchange. And also, a high voltage promotes the arc reigniting when current zero-crossing. After analyzing the full-bridge and half-bridge topologies of the secondary inverter as well as their relevant control strategies, their applicable limits, existing disadvantages and improving ways are pointed out.
语种	中文
出版者	Electric Welding Machine Magazine Agency ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80551]
专题	清华大学
推荐引用方式 GB/T 7714	Chen Jie,Zhu Zhi-ming. Secondary inverter topologies of the variable polarity GTAW power supply and their relevant control strategies[J],2010, 2010.
APA	Chen Jie,&Zhu Zhi-ming.(2010).Secondary inverter topologies of the variable polarity GTAW power supply and their relevant control strategies..
MLA	Chen Jie,et al."Secondary inverter topologies of the variable polarity GTAW power supply and their relevant control strategies".(2010).

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