Automatic tracking system and method for gas shield welding of straight seam steel pipe pre-welding machine

The invention provides an automatic tracking system and method for gas shield welding of a straight seam steel pipe pre-welding machine. The automatic tracking system comprises a driving system, the driving system comprises a driving card, a driving mechanism, a welding gun support, a welding gun and a visual sensor which are arranged in a host, the driving card in the host is connected with the driving mechanism through a signal line, and the driving mechanism is connected with the welding gun support; and the welding gun and the visual sensor are arranged on the welding gun support. The automatic tracking system can better identify the center of a welding seam and control the gas shield welding gun to follow up to trace the center of the welding seam, the line type of a welding bead after welding is perfect, and the system does not need an arc light shielding cover, shows higher anti-interference performance on arc light splashing, and can successfully solve the problem of welding deviation caused by poor a