The principle of spiral seam welded steel pipe welding method has the following characteristics: 1 The spiral seam welding method for steel pipe welding has a faster welding speed, which can greatly improve production efficiency. This is because the welding current is larger, the welding speed is faster, and the welding process can be completed in a shorter time. 2. Due to the sensor of the welding head being able to stably control the arc, uniform filling of the weld seam can be achieved during the welding process