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  • Title/Summary/Keyword: Hybrid joining

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Evaluation of Buckling Distortion for the Thin Panel Welded Structure According to Welding Processes (박판 패널 용접부의 용접 기법에 따른 좌굴 변형에 관한 연구)

  • Shin, Sang-Beom;Lee, Dong-Ju;Lee, Joo-Sung
    • Journal of Welding and Joining
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    • v.26 no.3
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    • pp.23-29
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    • 2008
  • The purpose of this study is to propose the proper fillet welding process for preventing the buckling distortion in thin panel welded structure. In order to do it, a heat input model for laser hybrid welding process was developed using FEA and experiment. The principal factors controlling the angular distortion and longitudinal shrinkage force caused by FCA and laser hybrid welding were identified as the welding heat input and weld rigidity using FEA. The predictive equations of angular distortion and longitudinal shrinkage force for each welding process were formulated as a function of the principal factors proposed. With the predictive equations, the buckling distortion at the thin panel welded structure with welding process was evaluated and compared using nonlinear buckling analysis and STEM(simplified thermo elastic method). Based on the results, the best way to prevent the buckling distortion at the given welded panel structures was identified as an intermittent FCA welding.

The characteristics of bead welding on steel with process parameter during the laser-arc hybrid welding(II) - Effect of heat input parameters - (강의 레이저-아크 하이브리드 용접시 공정변수에 따른 비드용접특성 (II) - 용접 입열 변수의 영향 -)

  • Kim, Jond-Do;Myung, Gi-Hoon;Park, In-Duck
    • Journal of Welding and Joining
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    • v.33 no.2
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    • pp.91-96
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    • 2015
  • The laser-arc hybrid welding of SS400 steel was carried out with the use of disk laser equipment of 6.6kW maximum power and MAG equipment of pulse mode. Parameter regarding heat input is one of the most important factors that directly affect penetration characteristics and welding defect. Therefore in this study, the effects of laser power, welding speed and current, voltage and pulse correction were investigated. As experiment result, it was found that the lower heat input, the more likely humping bead is formed at the back, and such humping bead could be suppressed by increasing laser power and arc current or decreasing welding speed, thus increasing heat input. Also deep penetration could be achieved by reducing arc voltage or pulse correction parameter in the same welding condition.

A Study on the Copper Metallizing Method of Al2O3 Ceramic Surface (알루미나(Al2O3) 세라믹 표면의 강메탈라이징법에 관한 연구)

  • ;;Choi, Y. G.;Kim, Y. S.
    • Journal of Welding and Joining
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    • v.13 no.3
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    • pp.55-64
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    • 1995
  • Metallizing method on ceramic surface is one of the compositing technology of ceramics and metal. The purpose of this study is to make HIC (Hybrid Intergrated Circuit) with copper metallizing method of which copper layer is formed on ceramic substrate by firing in atmosphere in lieu of conventional hybrid microcircuit systems based on noble metal. Metallizing pastes were made from various copper compounds such as Cu2O, CuO, Cu, CuS and kaolin. And the screen printing method was used. The characteristics of metallized copper layers were analyzed through the measurement of sheet resistance, SEM, and EDZX. The results obtainted are summarized as follows; 1. The copper metallizing layers on ceramic surface can be formed by firing in air. 2. The metallized layer using Cu2O paste showed the smallest sheet resistance among a group of copper chemical compounds. And optimum metallizing conditions are 15 minutes of firing time, 1000.deg.C of firig temperature, and 3 minutes of deoxidation time. 3. The results of EDAX analysis showed mutual diffusion of Cu and Al. 4. The kaolin plays a important role of deepening the penetration of Cu to Al2O3 ceramics. But if the kaolin content is too much, sheet resistance increases and copper metallizing layer becomes brittle.

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Weldability Evaluation in Plasma-GMA Hybrid Welding for Al-5083 Using Analysis of Variance (AL5083 합금에 대한 Plasma-GMA 용접에서 분산분석을 이용한 공정변수의 특성 평가)

  • Jung, Jin Soo;Lee, Jong Jung;Lee, Hee Keun;Park, Young Whan
    • Journal of Welding and Joining
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    • v.32 no.1
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    • pp.28-33
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    • 2014
  • In this paper, I-butt welding with 6mm thickness using Plasma-GMA welding was carried out. And weld characteristics of the Al-5083 aluminium alloy for Plasma-GMA hybrid welding was evaluated. The orthogonal experimental design was used to investigate the influence of plasma-MIG welding parameters such as plasma current, wire feeding rate, MIG-welding voltage and welding speed on the weld bead geometry and tensile strength using the ANOVA(Analysis of Variation). Then we conducted evaluation of contribution for process parameters. ANOVA results show that bead dimensions are affected by wire feeding speed, welding voltage and welding speed and tensile strength is mainly affected by welding speed and plasma arc current. Tensile strength was decreased by rise in plasma welding current because GMA welding current was decreased by plasma arc.

A Study on Laser Joining of Low Carbon Steel and Aluminum Alloy Part 1 : Process Parameters (강과 알루미늄의 레이저 접합에 관한 연구 Part 1 : 접합 변수의 최적 조건에 관한 연구)

  • Park, Tae-Wan;Cho, Jung-Ho;Na, Suck-Joo
    • Journal of Welding and Joining
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    • v.23 no.5
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    • pp.25-29
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    • 2005
  • Steel has been mainly used in the automotive industry, because of good mechanical properties, weldability and so on. However, there has been increase in using aluminum to reduce the weight of vehicle. This leads to improve fuel efficiency and to reduce air pollution. A steel-aluminum hybrid body structure is recently used not only to reduce the weight of vehicle but also to increase safety. In this paper, the laser beam joining method is suggested to join steel and aluminum. To avoid making brittle intermetallic compounds(IMC) that reduce mechanical properties of the joint area, only aluminum is melted by laser irradiation and wetted on the steel surface. The brittle IMC layer is formed with small thickness at the interface between steel and aluminum. By controlling the process parameters, brittle IMC layer thickness is suppressed under 10 micrometers which is a criterion to maintain good mechanical properties.

A Study on the Heat Distribution and Welding Residual Stress of Hybrid Laser-MIG Weld by Numerical Simulation (수치해석을 이용한 하이브리드 용접부의 열분포 및 용접잔류응력 분포에 관한 연구)

  • O Jong In;Bang Han Seo;Kim Yeong Pyo;Lee Jin Uk
    • Proceedings of the KWS Conference
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    • v.43
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    • pp.61-63
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    • 2004
  • Recently many research works are going on in the field of application of Laser-Arc hybrid welding for superstructures such as shipstructures. However, the study on heat distribution and welding residual stress of hybrid weld by numerical simulation loaves much to be desired. Therefore in this study an optimized welding condition and numerical simulation for hybrid welding by using Previous numerical analysis which was used to calculate the kent source for hybrid welding has been analyzed.

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Examination on the Mechanical Behavior of Hybrid Laser-MIG Weld (하이브리드 용접부의 역학적 거동 규명)

  • O, Jong-In;Park, Ho-Gyeong;Bang, Han-Seo;Bang, Hui-Seon;Seok, Han-Gil
    • Proceedings of the KWS Conference
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    • 2005.11a
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    • pp.243-245
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    • 2005
  • Recently many research are going on in the field of application of Laser-Arc hybrid welding for superstructures such as shop-structures, transport vehicles etc. However, the study on heat distribution and welding residual stress of hybrid weld by numerical simulation leaves much to be desired. Therefore in this study an optimized welding condition and numerical simulation for hybrid welding by using previous numerical analysis which is used to calculate the heat source for hybrid welding has been analyzed.

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