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Journal of KWJS 2008;26(2):92-97.
Published online June 18, 2008.
박판 고속 플라즈마 맞대기 용접에서 용접 시작부의 용락과 미용융에 미치는 시작블록과 아크길이의 영향
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The Effects of Start Block and Arc Length on Melt Through and Unmelted Zone at Welding Start in High Speed Plasma Arc Welding of Thin Plate
Yong-Su Chu, Seong-Joon Hong, Jae-Pil Jung, Sang-Myung Cho
Abstract
  In welding of thin plate, some defects such as melt through and unmelted zone occur easily at welding start, however there is a limited study on those problems. Therefore the effects of start block and arc length on melt through and unmelted zone at start were investigated in this study. When start block height was lower than base metal, there was melt through at start. And when the height was even with base metal, no unmelted zone existed. Unmelted zone was increased as start block height increased from 0㎜ to 0.5㎜. However unmelted zone was not much changed as the height increasing from 0.5㎜ to 1.0㎜. When gap existed between start block and base metal, melt through occurred. However, unmelted zone was increased as the contact force of start block on base metal was increased from 0㎏f to 7.5㎏f. And when arc length was decreased from 3.8㎜ to 3.0㎜, unmelted zone was decreased. It was concluded that the optimum condition to prevent melt through and to minimize unmelted zone would be with start block height 0.25㎜, contact force 3.0㎏f, and arc length 3.4㎜. This optimum condition was applied to the mass production line and resulted in satisfied outcome.
Key Words: Plasma Arc Welding, Thin plate, Unmelted Zone, Melt through, End effect, Melting efficiency, Standoff
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