| Closed-loop control of weld penetration in keyhole plasma arc welding |
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| 作者姓名： | 陈强 孙振国 孙久文 王耀文 |
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| 作者单位： | DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | 国家自然科学基金，the Key Laboratory Foundation of National Defense Science and Technology |
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| 摘 要： | To improve the penetrating ability and the welding quality of keyhole plasma arc welding, a novel penetration closed-loop control system was established. In the system, welding current and plasma gas flow rate were selected as adjusting variables. The wavelet method was used to detect penetration status from welding arc voltage in real-time. The control strategy of one-keyhole-per-pulse was adapted to fulfill stable and high quality welding process. Experimental results show that the developed system can apparently increase the penetrating force of plasma arc and keyhole plasma arc welding is realized successfully in stainless steel with 10 mm in thickness. Moreover,the disturbances of gradual change and break change from 3mm to 6mm in thickness are come over due to the good response property of the developed system.
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| 关 键 词： | 焊缝 熔深 闭环控制 等离子弧焊 PAW |
Closed-loop control of weld penetration in keyhole plasma arc welding |
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| CHEN Qiang,SUN Zhen guo,SUN Jiu wen,WANG Yao wen.Closed-loop control of weld penetration in keyhole plasma arc welding[J].Transactions of Nonferrous Metals Society of China,2004,14(1):116-120. |
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| Authors: | CHEN Qiang SUN Zhen guo SUN Jiu wen WANG Yao wen |
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| Abstract: | To improve the penetrating ability and the welding quality of keyhole plasma arc welding, a novel penetration closed-loop control system was established. In the system, welding current and plasma gas flow rate were selected as adjusting variables. The wavelet method was used to detect penetration status from welding arc voltage in real-time. The control strategy of one-keyhole-per-pulse was adapted to fulfill stable and high quality welding process. Experimental results show that the developed system can apparently increase the penetrating force of plasma arc and keyhole plasma arc welding is realized successfully in stainless steel with 10 mm in thickness. Moreover,the disturbances of gradual change and break change from 3 mm to 6 mm in thickness are come over due to the good response property of the developed system. |
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| Keywords: | plasma arc welding penetrating force plasma arc penetration closed-loop control |
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