• 제목/요약/키워드: welding speed

검색결과 815건 처리시간 0.021초

회전아크를 이용한 수평필릿 용접에 관한 연구 (II) - 고속용접공정의 개발 - (A Study on Horizontal Fillet Welding by Using Rotating Arc (II) - Development of High-speed Welding Process -)

  • 김철희;나석주;이현철;김세환
    • Journal of Welding and Joining
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    • 제21권3호
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    • pp.46-50
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    • 2003
  • The horizontal fillet joint is one of the most important weld joints in the shipbuilding industry. High-speed rotating arc welding, which can increase the leg length, is an effective way to improve the weld productivity and quality for the horizontal fillet welding. Based on the Taguchi method, the effects of welding parameters on bead characteristics - leg length, asymmetry, undercut, overlap - are investigated fur high-speed welding process. As a result, the adequate welding parameters are selected for the required leg length, symmetric bead and no undercut. Besides, considerably consistent leg length is observed for the horizontal fillet welding with gap variation up to 3mm.

Bead Formation and Wire Temperature Distribution during Ultra-high-speed GTA Welding Using Pulse-heated Hot-wire

  • Shinozaki, K.;Yamamoto, M.;Mitsuhata, Koichi;Nagashima, Toshiharu;Kanazawa, T.;Arashin, H.
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2009년 추계학술발표대회
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    • pp.226-234
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    • 2009
  • The purpose of this study was to investigate the melting phenomenon of filler wire in detail and to obtain the precise temperature distribution of filler wire during GTA welding under the ultra-high welding speed condition in order to develop the ultra-high-speed GTA welding process with the pulse-heated hot-wire system by using three kinds of materials. The melting phenomenon of filler wire was observed using a high-speed camera and the temperature distribution of filler wire was measured using a radiation thermometer. From the above result, the adequate welding conditions of each material to make the GTA welding process with the ultra-high welding speed could be obtained. The ultra-high-speed GTA welding process needed the adequate wire current in order to obtain the adequate temperature distribution and the adequate melting position of filler wire. Moreover, the temperature distributions of three kinds of filler wire could be estimated by using the proposed simple estimation method.

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고속 TIG 용접의 비드 안정성에 관한 연구 (A Study on the Bead Stability in High Speed TIG Welding)

  • 조상명
    • Journal of Advanced Marine Engineering and Technology
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    • 제18권3호
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    • pp.68-77
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    • 1994
  • TIG welding process is applied for the active metal such as aluminum and titanium, also sometimes for overlay welding of superalloy. However the welding speed to be applied is very low because of the unstable bead formed in the region of high current and high welding speed. The present study was carried out to examine the basic phenomena of high speed TIG melt run welding by the 2% Th - W electrode(dia.3.2mm) of various tip shapes.

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마찰교반 용접조건에 따른 Al 5052 알루미늄 합금의 접합특성 (The Joints Characteristics of Al 5052 Aluminium Alloy in Friction Stir Welds)

  • 강대민;장진숙;박경도;이대열
    • 동력기계공학회지
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    • 제20권3호
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    • pp.51-56
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    • 2016
  • In this study, the tensile tests and hardness tests were carried out for the joints characteristics in friction stir welds of Al 5052 alloy. Three way factorial design was applied to optimal welding conditions, whose control factors were shoulder diameter, rotation speed and welding speed of tool. From the results of this study, the optimum condition for maximum yield strength was predicted as the shoulder diameter of 15 mm, welding speed of 500mm/min and rotating speed of 1000 rpm. And the presumed optimal yield strength was estimated to be $167.36{\pm}7.82MPa$ with 99% reliability. In addition the increaser rotation speed of tool and the decreaser welding speed, the decreaser the hardness at welding part.

Effect of Welding Speed on the Microstructure and Mechanical Properties of Austenitic Stainless Steel Welds

  • Li, C.;Jeong, H.S.
    • International Journal of Korean Welding Society
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    • 제3권1호
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    • pp.23-28
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    • 2003
  • The effect of the welding speeds on the weld bead shape, microstructure, and mechanical properties in type 304 austenitic stainless steels was investigated by microscopic test, Erichsen test and tensile test. In this study welds were produced using autogeneous Direct Current Straight Polarity (DCSP) and pulsed current GTA welding. This study shows the ferrite content, ductility, tensile strength and elongation of high speed welds are decreased with increasing welding speed. The high speed welds exhibits satisfactory tensile strength, though the ductility is not good as that of the base metal.

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오스테나이트계 304 스테인리스강의 Nd:YAG 레이저 맞대기 용접특성 (Butt Welding Characteristics of Austenitic 304 Stainless Steel Using a Continuous Wave Nd:YAG Laser Beam)

  • 유영태;오용석;신호준;임기건
    • 대한기계학회논문집A
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    • 제28권2호
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    • pp.165-173
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    • 2004
  • Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and deep penetration. The thermal cycles associated with laser welding are generally much faster than those involved in conventional arc welding processes, leading to a rather small weld zone. Experiments are performed for 304 stainless steel plates changing several process parameters such as laser power, welding speed, shielding gas flow rate, presence of surface pollution, with fixed or variable gap and misalignment between the similar and dissimilar plates, etc. The following conclusions can be drawn that laser power and welding speed have a pronounced effect on size and shape of the fusion zone. Increase in welding speed resulted in an increase in weld depth/ aspect ratio and hence a decrease in the fusion zone size. The penetration depth increased with the increase in laser power.

PALW을 이용한 소경 스테인리스강 튜브의 용입특성 개선 (Improvement of Penetration Characteristics by Plasma Augmented Laser Welding of Small Diameter Stainless Steel Tubes)

  • 황재련;윤석환;나석주
    • Journal of Welding and Joining
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    • 제22권6호
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    • pp.30-35
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    • 2004
  • Laser welding is obviously an attractive method to join small, thin parts such as small stainless steel tubes, but it is very sensitive to the joint clearance and tolerance, and this makes laser welding difficult to obtain consistent welding qualities over time. Recently, Plasma Augmented Laser Welding(PALW) is being developed to solve these problems. In this study, plasma arc welding(PAW) was introduced to join conventional V-grooved butt joint of thin stainless steel strips using single laser heat source in manufacturing small stainless steel tubes. The effect of the welding speed enhancement is investigated by the experiments. Effects of welding directions, distance between the heat sources and intensity of arc heat source on the optimal welding speed was investigated. Through this research, it was confirmed that PALW process has higher welding speed and robustness than laser welding process.

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

  • 정진수;이종중;이희근;박영환
    • Journal of Welding and Joining
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    • 제32권1호
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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.

용가 와이어를 적용한 알루미늄 레이저 용접에서 공정 자동화를 위한 유전 알고리즘을 이용한 공정변수 최적화 (Optimization of Process Parameters Using a Genetic Algorithm for Process Automation in Aluminum Laser Welding with Filler Wire)

  • 박영환
    • Journal of Welding and Joining
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    • 제24권5호
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    • pp.67-73
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    • 2006
  • Laser welding is suitable for welding to the aluminum alloy sheet. In order to apply the aluminum laser welding to production line, parameters should be optimized. In this study, the optimal welding condition was searched through the genetic algorithm in laser welding of AA5182 sheet with AA5356 filler wire. Second-order polynomial regression model to estimate the tensile strength model was developed using the laser power, welding speed and wire feed rate. Fitness function for showing the performance index was defined using the tensile strength, wire feed rate and welding speed which represent the weldability, product cost and productivity, respectively. The genetic algorithm searched the optimal welding condition that the wire feed rate was 2.7 m/min, the laser power was 4 kW and the welding speed was 7.95 m/min. At this welding condition, fitness function value was 137.1 and the estimated tensile strength was 282.2 $N/mm^2$.

Microstructure and Tensile Strength of Butt Joint between AA6063 Aluminum Alloy and AISI304 Stainless Steel by Friction Stir Welding

  • Sadmai, Karuna;Kaewwichit, Jesada;Roybang, Waraporn;Keawsakul, Nut;Kimapong, Kittipong
    • International Journal of Advanced Culture Technology
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    • 제3권1호
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    • pp.179-187
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    • 2015
  • This study presents the experimental results of the Friction Stir Welding (FSW) of AA6063 aluminum alloy and AISI304 stainless steel butt joint by varying the welding parameters such as the rotating speed and the welding speed. The main results are as follows. The variation of the welding parameters produced various characteristic interfaces and had distinct influences on the joint properties. Increasing the rotating speed and the welding speed decreased the joint tensile strength because it produced the defect on the joint interface. The optimum welding parameter that could produce the sound joint was a rotating speed of 750 rpm and the welding speed of 102 mm/min with the tensile strength of 71 MPa.