• Title, Summary, Keyword: Friction welding

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Friction Welding Analysis of Welding Part Shape with Flow Gallery by Friction Welding (마찰용접에 의해 유동부를 갖는 용접부 형상의 마찰용접해석)

  • Yeom S. H.;Nam K. O.;Yoo Y. S.;Hong S. I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.109-112
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    • 2005
  • Friction welding is welding method to use frictional heat of two material. A defect of friction welding is that create flash. The flash is part that must have cut after welding finished. But the welding part with flow gallery by friction welding can't cut flash. Therefore the welding part with flow gallery was designed with no effect in flow. In this research, decide the welding shape parameter of welding part with flow gallery and do friction welding analysis. In friction welding analysis, must input necessary S-S curve, friction coefficient by temperature change, upset pressure, RPM etc. According to analysis result, decided the optimal shape of welding part with no effect in flow.

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Effects of Welding Condition on Hardness and Microstructure of Friction Stir Welded Joints of AI-7075-T651 Plate (용접조건이 AI-7075-T651의 마찰교반용접부의 경도와 미세조직에 미치는 영향)

  • Kim, C.O.;Sohn, H.J.;Kim, S.J.
    • Journal of Power System Engineering
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    • v.15 no.3
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    • pp.58-64
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    • 2011
  • As well known, the friction stir welding is a novel welding process which is a solid state welding process for sheet or plate using the friction stir phenomenon. This paper describes the effect of welding condition such as the rotation speed and the travelling speed during the friction stir welding process on the micro Virkers hardness and the microstructure of friction stir welded joints in AI-7075-T651 plate. From those investigations, the highest hardness of stir zone was observed at the welding condition of SO-3. The microstructures of the friction stir welded joints was not dependent on the welding conditions, but in the SO-4 specimen, the friction stir welding defect like tunnel shape was found in stir zone.

Friction Weldability of Grey Cast Iron - by the Concept of Friction Weld Heat Input Parameter - (회주철의 마찰용접 특성에 관한 연구 - 입열량 이론식을 중심으로 -)

  • Jeong, Ho-Shin;Bang, Kook-Soo
    • Journal of Welding and Joining
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    • v.32 no.3
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    • pp.95-101
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    • 2014
  • Joining of grey cast iron by fusion welding has much difficulties for its extremely low ductility and low toughness because of the flake form of the graphite. And the brittle microstructure, i.e. ledeburite may be formed during fusion welding by its rapid cooling rates. By these kinds of welding problem, preheat and post heat treatment temperature must be increased to avoid weld crack or welding problems. In order to avoid these fusion welding problem, friction welding of cast iron was carried out for improving joint soundness, establishing friction welding variables. There is no factor for evaluating friction weldability in continuous drive type friction welding. In this point of view, this study proposed the parameters for calculating friction weld heat input. The results obtained are as follows ; 1. There was a close relationship between tensile strength and flash appearance of friction welded joint. 2. Tensile strength was decreased and flash was severely oxidized as increasing frictional heating time. 3. As increased forging pressure $P_2$, flash had a large crack and tensile strength was decreased. 4. As powdered graphite by rotational frictional force induced flat surface and hindered plastic flow of metal, tensile strength of welded joint was decreased. 5. Heat input for continuous drive type friction welding could be calculated by the factors of $P_1$, $P_2$ and upset distance(${\delta}$).

Electric Resistance Heated Friction Stir Spot Welding of Overlapped Al5052 Alloy Sheets (중첩된 알루미늄 5052 합금판재의 전기저항가열 마찰교반점용접에 관한 연구)

  • Kim, T.H.;Jang, M.S.;Jin, I.T.
    • Transactions of Materials Processing
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    • v.24 no.4
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    • pp.256-263
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    • 2015
  • Electric resistance spot welding has been used to join overlapped steel sheets in automotive bodies. Recently to reduce weight in automotive vehicles, non-ferrous metals are being used or considered in car bodies for hoods, trunk lids, doors parts, etc. Various welding processes such as laser welding, self-piercing rivet, friction stir welding are being used. In the current study, a new electric resistance heated friction stir spot welding is suggested for the spot welding of non-ferrous metals. The welding method can be characterized by three uses of heat -- electric resistance heating, friction stir heating and conduction heating of steel electrodes -- for the fusion joining at the interfacial zone between the two sheets. The welding process has variables such as welding current, diameter of the steel electrodes, revolutions per minute (rpm) of the friction stir pin, and the insert depth of the stir pin. In order to obtain the optimal welding variables, which provide the best welding strength, many experiments were conducted. From the experiments, it was found that the welding strength could be reached to the required production value by using an electrode diameter of 10mm, a current of 7.6kA, a stirring speed of 400rpm, and an insert depth of 0.8mm for the electric resistance heated friction stir spot welding of 5052 aluminum 1.5mm sheets.

A study on the Design on the Tubular Drive Shaft (중공 드라이브 샤프트의 설계에 관한 연구)

  • Kim, Woo-Kang;Go, Jun-Bin;Kim, Hong-Bae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.8 no.3
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    • pp.7-12
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    • 2009
  • This study aims to find the friction welding and induction harden conditions, which are obtained by welding conditions, and the friction welding characteristics and induction harden conditions of tubular shaft were investigated with respect to low load test, high load test. Friction welding and induction harden machine have been widely used in manufacturing reflects of metal. The material of solid and tubular shaft selected that is used for parts of automobile steel. Such as steel are easy to be machined because of their proper material. As a result I obtained the data of friction welding conditions makes good and the condition of friction and get the tubular condition. The purpose of this study is to find fatigue test condition and induction harden characteristics design for tubular shaft.

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A Study on the Joint Properties according to the Friction Welding Area Change of Carbon Steel(SM25C) (탄소강(SM25C)의 접합면적의 변화에 따른 마찰용접의 접합특성에 관한 연구)

  • Park Keun Hyung;Min Taeg Ki;Yoon Young Joo;Park Chang Soo
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.1
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    • pp.102-107
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    • 2006
  • This study investigates the properties as the difference friction welding area on SM25C steel rod. The tensile and bending strength and of welded joints, the hardness distribution of welds, the microstructure of welds and the tensile fracture surfaces were mainly investigated through this experiment. The fixed friction welding conditions were revolution 2000rpm, friction pressure 70Mpa, friction time 1.5sec, upset pressure 100Mpa, upset time 2.0sec, upset length 2.8mm and changeable friction welding parameter was friction welding area.

Friction Welding of Dissimilar Press Punch Materials and Its Evaluation by AE (신소재 금형펀치의 이종재 마찰용접 개발과 AE품질평가를 위한 연구)

  • 오세규;박일동;이원석
    • Journal of Welding and Joining
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    • v.15 no.2
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    • pp.43-53
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    • 1997
  • The complete joining method for dissimilar press punch materials and its real-time evaluation method is not available at present. Brazing method has been used for joining them, but it is known that the welded joint by the brazing has the lower bonding efficiency and reliability than the diffusion welding. The friction welding with a diffusion mechanism in bonding was applied in this study. This work was carried out to determine the proper friction welding conditions and to analyze mechanical properties of friction welded joints of sintered carbide tool materials (SKNM50 for the blade part of press punch) to alloy steel (SCM440 for the shank part of press punch) using aluminum (A6061 for the interlayer material) as an insert material between the sintered carbide tool materials and the alloy steel. In addition, acoustic emission test was carried out during friction welding to evaluate the weld quality.

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Friction Stir Welding of Aluminium alloys and Its Application (알루미늄합금의 마찰교반접합 및 그 적용)

  • 연윤모;정승부;박종목
    • Proceedings of the KSR Conference
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    • pp.226-234
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    • 2000
  • The friction stir welding technique is a derivative of conventional friction welding, which enables the advantages of solid-phase welding to be applied to the fabrication of long butt and lap joints, with very little postweld distortion. Friction stir welding is a remarkable new welding technique for joining aluminum alloys and has the potential for welding other ferrous materials. It has already been developed beyond a laboratory curiosity and has been proved as a potential practical welding technique offering low-distortion, high-quality, low-cost welds from simple concept machine tool welding equipment. To bring this remarkable method of welding aluminum alloys to the attention of Industry, this article introduces the basic principle of friction stir welding, pointing out the practical advantages and most important of all, describes the exceptionally good metallurgical and mechanical properties.

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Friction Welding of Inconel 713C and SCM 440 (Inconel 713C와 SCM 440의 마찰용접)

  • 조현수;서성재
    • Journal of Welding and Joining
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    • v.15 no.6
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    • pp.78-84
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    • 1997
  • Friction welding technique was studied to weld the turbine wheel and shaft of a turbocharger. The welding parameters were selected to investigate the effects of variables on welding quality of Inconel 713C and SCM 440. Experimental results showed that the turbine wheel and shaft could be successfully welded by friction welding. The heat affected zone was identified to be 2 mm from the weld seam. After welding, the hardness profile was found to have sudden increase and decrease for inconel 713C and SCM 440 respectively. Tensile strength of welded specimens was higher than the required strength for all of the studied welding parameters. The central portion of fracture surfaces by bending had no defects such as crack.

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THE EVALUATION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDEDAL-MG-SI ALLOY

  • Lee, Won-Bae;Yeon, Yun-Mo;Jung, Seung-Boo
    • Proceedings of the KWS Conference
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    • pp.499-504
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    • 2002
  • The microstructural change associated with the hardness profile in friction stir welded, age-hardenable 6005 Al alloy had been evaluated. Frictional heat and plastic flow during friction stir welding created the fine recrystallized grain (Stir Zone, SZ), the elongated and recovered grain (Thermo-Mechanical Affected Zone, TMAZ) in the weld zone. Heat affected zone (HAZ), which could be only identified by hardness test because there is no difference in the grain structure compared with that of the base metal, was formed beside the weld zone. A softened region had been formed near the weld zone during friction stir welding process. The softened region was characterized by the dissolution and coarsening of the strengthening precipitate during the friction stir welding. The sound joints of 6005 Al alloys were successfully formed under a wide range of the friction stir welding conditions.

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