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문형순,고성훈,김용백,Moon, Hyeong-Soon,Ko, Sung-Hoon,Kim, Yong-Baek 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.2
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.
A study on humping bead formation on vertical-upward position
Jin-Hyeong Park(박진형),Hyeong-Soon Moon(문형순),Sung-Hwan Kim(김성환),Dae-Won Cho(조대원) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Humping bead which commonly occurs in high current and high speed welding seriously deteriorates weld property. The periodical humping formation is investigated by a transient three-dimensional numerical simulation and observes the molten pool dynamic behavior using a high-speed camera in vertical-upward position. The instant solidification, backward flow, surface tension, Marangoni stress and gravity have significant effects on fluid flow in rear part of molten pool, which influences the humping formation correspondingly. The numerical results show that the deformation of molten pool surface and the elongation of gouging region are two initial requirements for humping formation.