LNG儲罐用9%Ni鋼自動立縫焊接系統(tǒng)設(shè)計
[Abstract]:With the increasing consumption of global liquefied natural gas (Liquefied natural gas,) for short (LNG), 9%Ni steel with good low temperature toughness has become the main material for building LNG low temperature storage tank. The vertical seam welding of LNG storage tank wall plate is an important welding procedure. At present, Manual welding is mainly used. The welding efficiency is low, the working conditions are poor, the strength is high, the welding quality is not easy to guarantee, so the research is convenient, simple, efficient and fast. The automatic vertical seam welding system of 9%Ni steel for LNG storage tank with high welding quality has become the primary task. Firstly, according to the design requirements of automatic vertical seam welding machine, the welding performance of 9%Ni steel is analyzed, the reasonable welding process and welding method are put forward, and the pulse welding with adjustable base value and peak current is designed. The wiggler can realize the control of welding torch swing and argon arc pulse current in the same frequency, same phase and same pulse width, and the hot wire current input value can be controlled by PID control algorithm by establishing the hot wire control model. According to the relationship between arc voltage and arc length, the variable gain PID arc length tracking control algorithm is realized, and the stable wire feeding strategy of wire feeder motor is realized by Pi algorithm. The mechanical structure of welding equipment is designed according to the requirements of welding strategy control. Then, according to welding control technology and control requirements, a set of automatic vertical arc welding machine control system based on Siemens S7-1200 PLC controller is designed for hardware circuit selection. The software design of welding process, pulse welding, swing of swinging device, input value of hot wire current, adjustment of arc voltage, stable wire feeding and so on are carried out. The system controls the display of touch screen and operation button on the counter board. The system can realize the acquisition of external signals, man-machine dialogue, setting parameters, displaying welding timing, moving state, and Indu Soft configuration software based on PAC. The welding on-line monitoring system is developed, the communication between PAC and S7-1200 PLC is completed, and welding cost management, data management, equipment management, personnel management and quality management are realized. Finally, through field test and customer usage, it is shown that PLC control system has strong hardware anti-interference ability, simple maintenance, improved reliability, the software can meet the requirements of welding process control, and the weld quality inspection is qualified. The whole system realizes the mechanization and automation control of 9%Ni steel automatic vertical seam welding system in the welding process of LNG storage tank.
【學位授予單位】:哈爾濱理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TE972;TG457.11
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