Full automatic field welding process of pipe pile using non- shielded arc welding

In a semiautomatic welding process, welded wire is automatically drawn out, but the quality of welded joints partly depends on the skill of welders, because welding is carried out by manual labor. In this sense, human element still remains in this method. In order to reduce the human element and achieve higher uniformity, subsequently to the development of a semi- automatic welding process, human labor has been supplemented by mechanical elements as much as possible. The welding process is making progress toward automation of higher efficiency due to higher wages resulting from the increasingly few skilled welders and thenefficiency of difficulty in the control of welding techniques.