| CHEN Ke-xuan,BAI Xue-mei,LI Jian-guo,LI Chun-xu,CHEN Jing.Application of PTA in Tri-eccentric Butterfly Valve[J],37(6):84-86 |
| Application of PTA in Tri-eccentric Butterfly Valve |
| Received:September 10, 2008 Revised:December 10, 2008 |
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| DOI： |
| KeyWord:Tri-eccentric butterfly valve Tracking control Plasma transferred arc welding |
| Author | Institution |
| CHEN Ke-xuan |
College of Material, Lanzhou University of Technology, Lanzhou , China |
| BAI Xue-mei |
College of Material, Lanzhou University of Technology, Lanzhou , China |
| LI Jian-guo |
Lanzhou Petrochemical Machinery Institute, Lanzhou , China. |
| LI Chun-xu |
College of Material, Lanzhou University of Technology, Lanzhou , China |
| CHEN Jing |
College of Material, Lanzhou University of Technology, Lanzhou , China |
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| Abstract: |
| With the advantages of good corrosion resistance, reliable seal, small unsealed moment and so on, tri-eccentric metal seal butterfly valve is increasingly applied extensively. In order to improve wearing resistance of the seal and prolong the operational life span, surface modification must be done to the seal. In the process of tri-eccentric butterfly valve surface welding through plasma transferred arc welding instead of manual metal arc welding, some problems appear, such as nonlinear displacement of PTA surface and welding coat crack. Based on the development of the automatic tracking control system of plasma transferred arc welding with MCU 80C196KC and PLC CPM2A-60CDR-A as its core components, under the conditon of no preheating environment, through a great lot of technical experiment, rational material selecting of PTA and technologic parameter, the uniform transferred arc welding coating without crack disfigurement was obtained, which accords with the quality requirements. The achievement has been applied in the actual production of the product successfully. |
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