High-speed automatic argon arc root welding method for long-distance pipeline

The invention discloses a high-speed automatic argon arc root welding method for a long-distance pipeline. The method comprises the steps that S1, preparation before welding is conducted; s2, cleaning is conducted; s3, preheating the groove; s4, aligning openings; s5, equipment is installed; s6, welding is conducted; s7, matched filling and covering are carried out; and S8, information acquisition and storage. The automatic welding gun is adopted, the control system is used for generating high and low frequency circulating double pulse current, mature control parameters are used for further improving the reliability of pipeline backing welding, the root welding speed is increased to the maximum 250 mm/min, the efficiency is greatly improved, meanwhile, the operating welding parameters are synchronously recorded and filed and stored, and the welding quality is improved. And convenience is provided for subsequent research and use. 本发明公开了一种长输管道高速自动氩弧焊根焊方法，包括S1、焊接前准备；S2、清理；S3、坡口预热；S4、对口；S5、安装设备；S6、焊接；S7、配套填充，盖面；S