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  • Title/Summary/Keyword: Hybrid joining

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A Study on the Process of Hybrid Welding Using Pulsed Nd:YAG Laser and Dip-transfer DC GMA Heat Sources (펄스형 Nd:YAG 레이저와 단락이행모드의 직류 GMA 열원을 이용한 하이브리드 용접 공정에 대한 연구)

  • Cho, Won-Ik;Na, Suck-Joo
    • Journal of Welding and Joining
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    • v.25 no.6
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    • pp.71-77
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    • 2007
  • Until now, many researches on laser-arc hybrid welding processes have been conducted mainly for high power CW laser and high direct current arc to weld the thick steel plates for shipbuilding. Recently, however the usage of thin steel plates, which tend to be deformed easily by thermal energy, is been increasing because of demand of light structure such as car body in the automobile industry. Accordingly, heat sources having relatively low heat input such as pulsed laser, dip-transfer DC GMA and pulsed GMA seem to be applied more increasingly and the study about those heat sources is needed more intensively. Any heat source mentioned above can not stand alone without weld defects at a relatively high welding speed for increasing the welding productivity. This is main reason to apply the hybrid welding process which uses pulsed laser and low-heat-input GMA heat sources simultaneously to weld the thin steel plate. In this study, parameters of pulsed laser and dip-transfer DC GMA welding are studied firstly through preliminary experiments, and then analyzed in the viewpoint of their physical phenomena. Before conducting the hybrid welding, a pulse control technique is developed based on the parallel port communication and Visual C++ 6.0. Owing to development of this technique, interactions of laser and arc pulses can be controlled consistently. Using the pulse control technique, the hybrid welding is conducted and then its interactive welding phenomenon is analyzed.

Design of the Hybrid Composite proceeding Bearing Assembled by Interference Fit (억지끼워맞춤을 이용한 하이브리드 복합재료 저널베어링의 설계)

  • Kim, Seong-Su;Lee, Dai-Gil
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.11a
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    • pp.219-223
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    • 2005
  • In this work, a hybrid composite proceeding bearing (HCJB) composed of carbon/phenolic laminated composite bush and steel housing was designed for marine vessels because the composite proceeding bearing reduces the possibility of the seizure problem between the proceeding and bearing. The two components of bearing were assembled by interference fit joining method and a series of durability tests were conducted using the laboratory bench with the lubricants of SAE 30 oil, water, and sea water. That the HCJB was found reliable under the interference fitting loads and environmental temperature change.

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Optimization of Plasma Spray Coating Parameters of Alumina Ceramic by Taguchi Experimental Method (실험계획법에 의한 알루미나 세라믹의 플라즈마 용사코팅 최적화)

  • 이형근;김대훈;윤충섭
    • Journal of Welding and Joining
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    • v.18 no.6
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    • pp.96-101
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    • 2000
  • Sintered alumina ceramic substrate has been used for the insulating substrate for thick Hybrid IC owing to its cheapness and good insulating properties. Some of thick HIC's are important to eliminate the heat emitted from the parts that are mounted on the ceramic substrate. Sintered ceramic substrate can not transfer and emit the heat efficiently. It's been tried to do plasma spray coating of alumina ceramic on the metal substrates that have a good heat emission property. The most important properties to commercialize this ceramic coated metal substrate are surface roughness and deposition efficiency. In this study, plasma spray coating parameters are optimized to minimize the surface roughness and to maximize the deposition efficiency using Taguchi experimental method. By this optimization, the deposition efficiency was greatly improved from 35% at the frist time to 75% finally.

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The Effect of Shielding Gas Composition on High Power Laser Welding Characteristics (보호가스 종류에 따른 고출력 레이저 용접특성)

  • Ahn, Young-Nam;Kim, Cheolhee
    • Journal of Welding and Joining
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    • v.33 no.4
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    • pp.17-23
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    • 2015
  • Laser-gas metal arc hybrid welding has been considered as an alternative process of gas metal arc welding for offshore pipe laying. Fiber delivered high power lasers which enable deep penetration welding were recently developed but high power welding characteristics were not fully understood yet. In this study, the influence of shielding gas composition on welding phenomena in high power laser welding was investigated. Bead shapes, melt ejection and dropping were observed after autogenous laser welding with 100% Ar, Ar-20% CO2, Ar-50% CO2, and 100% CO2 shielding gas. Process parameter window was widest with Ar-50% CO2 shielding gas and the penetration was deepest with 100% CO2 shielding gas. The melt dropping was not observed when Ar-50% CO2 or 100% CO2 shielding gas was supplied.