• 제목/요약/키워드: Gap bridging capability

검색결과 4건 처리시간 0.015초

조선용 강재의 $CO_2$레이저 GMA 하이브리드 용접에서 갭 브리징 능력 향상기술 개발 (Improvement of Gap Bridging Ability in $CO_2$ Laser-GMA Hybrid Welding)

  • 채현병;김철희;김정한;이세헌
    • Journal of Welding and Joining
    • /
    • 제24권5호
    • /
    • pp.49-56
    • /
    • 2006
  • For laser welding in shipbuilding industry, gap bridging capability is one of the most important characteristics to achieve the high productivity and good weld quality. Recently, laser-GMA hybrid welding process is regarded as a distinctive method to overcome the tight gap tolerance with improving the productivity. In this study, the influence of process parameters on the bead formation was experimentally analyzed and the relationship between the process parameters and geometric imperfections was investigated. It was revealed that undercut, excessive weld metal, excessive penetration and incompletely filled groove were the major geometric imperfections. The optimized wire feeding and arc pressure were necessary to ensure the gap bridging ability. The approach to select the process parameters was conducted for butt welding with up to 2mm joint gap, in which the sound weld beads were generated without changing the welding speed.

용접 와이어를 사용한 Al5052 $CO_2$ 레이저 용접 (Al5052 Welding by $CO_2$ Laser using Filler Wire)

  • 박기영;이경돈;김주관
    • 한국레이저가공학회지
    • /
    • 제5권1호
    • /
    • pp.13-21
    • /
    • 2002
  • Compared to conventional welding process, laser welding does not use additional filler wire generally. However, if laser welding uses the filler wire, the applicability of the method can be broaden. When laser welding uses the filler wire, it is possible to enhance gap bridging ability and to prevent cracking in weld pool by metallurgical control. In this study, we had optimal condition and experimented gap bridging capability for butt welding with 2㎜ Al5052 alloys using the filler wire feeder. As the experimental parameters, wire feed rate and wire diameter are considered and then the performance of wire feed is evaluated under various filler wire welding conditions.

  • PDF

박판 GMA 용접에서 단락 주파수를 이용한 이면비드의 제어에 관한 연구 (A Study on the Back Bead control by Using Short Circuit Frequency in GMA Welding of Sheet Metal)

  • 안재현;김재웅
    • Journal of Welding and Joining
    • /
    • 제13권4호
    • /
    • pp.75-84
    • /
    • 1995
  • In GMA welding of sheet metal, the short circuit metal transfer mdoe is preferred because of its low heat input and capability of bridging the root gap. The molten electrode is transferred to the workpiece during repectitive short circuit in the model. The waveform of welding current or voltage and the frequency of short circuiting are affected by a number of factors including: magnitude of welding current and voltage, root gap, electrode extension, power supply characteristics, and so on. In this study experimental models were proposed, which are able to determine the relationship between the root gap and short circuit frequency and the relationship between the root gap and appropriate welding speed that produces the good quality of back bead without burn through. Using the experimental models, the root gap can be obtained from measuring the short circuit frequency, and then the appropriate weldig speed to the root gap can be determined. Thus a back bead control system was constructed by controlling the welding speed for maintaining the quality of back bead. The developed system has shown the successful capability of back bead control.

  • PDF

Particle Swarm Optimization based Haptic Localization of Plates with Electrostatic Vibration Actuators

  • Gwanghyun Jo;Tae-Heon Yang;Seong-Yoon Shin
    • Journal of information and communication convergence engineering
    • /
    • 제22권2호
    • /
    • pp.127-132
    • /
    • 2024
  • Haptic actuators for large display panels play an important role in bridging the gap between the digital and physical world by generating interactive feedback for users. However, the generation of meaningful haptic feedback is challenging for large display panels. There are dead zones with low haptic sensations when a small number of actuators are applied. In contrast, it is important to control the traveling wave generated by the actuators in the presence of multiple actuators. In this study, we propose a particle swarm optimization (PSO)-based algorithm for the haptic localization of plates with electrostatic vibration actuators. We modeled the transverse displacement of a plate under the effect of actuators by employing the Kirchhoff-Love plate theory. In addition, starting with twenty randomly generated particles containing the actuator parameters, we searched for the optimal actuator parameters using a stochastic process to yield localization. The capability of the proposed PSO algorithm is reported and the transverse displacement has a high magnitude only in the targeted region.