Research On Collaborative Control System Of Twin-wire High Efficiency Submerged Arc Welding Based On ARM

Compared with single-wire Submerged Arc Welding(SAW), twin-wire SAW has two arcs, the input heat of which increases, thus significantly improves welding efficiency and effectively avoids biting edge, hump and other defects in high speed welding. At present, the two power supplies of common twin-wire SAW strike arc and receive arc at the same time, and there is only single-wire welding effect in the arc striking and arc receiving position, where the weld width is narrower than other place, and the welding strength is hard to meet the requirements,wasting the parent metal. The big current effect in arc receiving process leads to big arc crater in weld tail, but melting wire can’t fill the arc crater, thus the weld tail collapses. Besides, the AC power adopted by post welding wire is easy to strike arc unsuccessfully and break arc in high speed welding, which has a bad impact on welding effect.This paper put forward a proposal to solve above problem by adopting collaborative control system. When welding is started, start the trolley, then the lead welding wire strikes arc. When the post welding wire arrives where the lead wire strikes arc, the post wire strikes arc. When welding is stopped, stop the AC power first, then decrease the current and wire feed voltage of the post wire. The collaborative controlled twin-wire SAW system has complete twin-wire welding effect, and the arc crater defect in arc receiving process is obviously improved. After the heating of the parent metal by the lead wire, the power for AC power supply to strike arc and maintain arc decreases, leading to more stable SAW welding process and better welding effect.In this paper,the micro-chip TM4C123 GHPGE, which is based on ARM’s Cortex?-M4 core, is used as the main chip. Based on it, the collaborative control system of twin-wire SAW is developed, and the relative hardware circuit and software is designed. Hardware circuit includes a minimum system, with isolated Digital to Analog conversion circuit, AD sampling circuit, CAN bus communication interface circuit, wire speed feed circuit, trolley speed control circuit and so on. Software includes main program, parameters presetting program, welding start program, welding process control program, welding stop program, AD sampling program and CAN communication program and other subprograms. Meanwhile, a human-computer interaction system,which is based on ARM and touchscreen,is designed, achieving the digitization and visualization of human-computer interaction system.Finally, experimental platform is set up based on the collaborative control system. The single-wire DC SAW experiment, the single-wire AC SAW experiment, common twin-wire SAW experiment and collaborative controlled system twin-wire SAW experiment are conducted. Experimental results indicate that the collaborative controlled twin-wire SAW system works reliably and stably,having good welding effect and high welding efficiency, and the collaborative control effect of welding process,arc striking and arc receiving are good,realizing collaborative control of the twin-wire high efficiency SAW.