Detection of Welding Torch Inclination Based on Rotating Arc Sensor

Detection welding torch inclination in real time has both theoretical and practical significant meanings, but relative studies are still rare till now. Working principles and composition structures of rotating arc sensor are introduced at first, the changing rule of arc length is analyzed later according to five categories of horizontal bias between welding gun and seam line, the five situations are torch on middle of seam, torch on right of seam completely, torch on right of seam partially, torch on left of seam completely, torch on left of seam partially. Detailed deductive processes of the first two situations are given out and conclusions of others are given out directly. A method, named integral difference of welding current is realized by 3-layer BP network based on work above, massive Gas Metal Arc Welding (GMAW) tests on 90deg V-shape groove to detect slop angle have been carried out using high-speed rotating arc sensor, preliminary results indicate that the method provided here is correct and effective.