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Journal of KWJS 2007;25(2):49-54.
Published online May 17, 2007.
Automatic Multi-torch Welding System with High Speed
Hyeong-Soon Moon, Sung-Hoon Ko, Yong-Baek Kim
  Since the wall thickness can be up to 6" or greater, welds must be made in many layers, each layer containing several passes. However, the welding time for the conventional welding processes such as SAW(Submerged Arc Welding) and FCAW(Flux Cored Arc Welding) can be required many hours. The aim of this paper is to develop a high speed welding system with multi-torch and laser vision sensor for increasing the production speed on the line and to remove the need for the operator so that the system can run automatically for the complete multi-torch multi-layer weld. It was shown that the developed laser vision sensor and analysis of arc blow for multi-torch were effective for multi-pass seam tracking and stable arc. A new automated multi-torch welding systems for thick wall applications has been proved in several production lines.
Key Words: Multi torch, Arc blow, Laser vision sensor, Seam tracking, Multi-pass Multi-layer welding, Electro-magnetic force, Self-induced magnetic force
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