Longitudinal submerged arc external welding

Video link:  https://www.youtube.com/watch?v=eAlRuehM1-8

Longitudinal Submerged Arc Welding is a specific welding technique used in pipe production where the finished product requires a particularly high wall thickness due to high internal or external pressures.
With this in mind the main applications of LSAW pipes include oil, natural gas, gas, central heating, water supply, sewage treatment and other similar uses.

As you can see from this video, it’s about external welding. After internal welded, pipes will be transferred to the external welding line. The automatic welding will be proceed after speed, working current, voltage and other factors be set. By this way you can watch the welding directly, as the arc was submerged, the flux covered the arc. And extra flux will be recycled by the machine.