Digital Management Arc Automatic Welding Equipment

The automatization and intelligence of welding process is the development tendency of welding technology. Submerged Arc Welding(SAW) is the earlist mechanized welding method and is wildly used in industry. According to the characteristic of SAW, the main research work focused on is as followed:1 , To meet the demand of the SAW control, This paper introduces a design of the digital control system for submerged arc welding (SAW) applicable to various sorts of welding rectifier and feed wire device droved by DC motor, a control system of power source and digital process with 80C196KB as the core was designed. The developed welder presented many advantages such as welding parameters preset, store, lock, display, and automatic arc starting and stopping functions.2, The welding power source made of three-phase half-control bridhe thyristor rectifier provided four kind of static output characteristics which were constant current, constant voltage, quick and slowly current descending. Two PI adjusters were applied for wire feeding velocity control, one performed motor armature voltage feedback, the other one executed arc voltage feedback to determine the given velocity.3, Exchanging data of power source and process controller by adapting 20mA current loop by a serial communication interface, which satisfy real time control demand. The manner of arc starting control increases succeed rate, current attenuation arc stopping control improves welding shaped of arc pit. The interface of man-machine abundances the function of SAW.4, A control system of the welding operation machine was designed. On the one hand, designing across arm flex timing control by using 80C196KB; on the other hand, realizing the control of the trolley or the revolving stage by using AT89C2051 and transducer as the core of the control. According to the above project, designing hardware circuit of the control system possessing the capability of anti-jamming, guaranteeing the demand of real time sampling, calculating, controlling etc.5, Designing system software modularizly, carving up module according to various function, include sampling conversion, man-machine interfance, system parameter setting, parameter preseting, online communication etc. Designing manifold arithmetic of arithmetic mean value filter the waves PI control etc, guaranteeing characteristic of real time and precision of the system.