• 제목/요약/키워드: Resistance spot welding

검색결과 276건 처리시간 0.027초

가열된 금형에 삽입된 구리전극에 의한 중첩된 알루미늄 합금판재의 드로잉성형 동시 점용접 특성 (Characteristics of Drawing and Concurrent Spot Welding of Overlapped Aluminum Plates with Copper Electrodes Inserted in Heated Dies)

  • 김태현;진인태
    • 소성∙가공
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    • 제26권3호
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    • pp.174-180
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    • 2017
  • In this study, a new spot welding with electric resistance heated dies is suggested for the spot welding of non-ferrous metal plates for drawing and concurrent spot welding. This welding method involves two heating processes such as heating by conduction of electric resistance heated dies and heating by resistance between contacted surfaces of two plates by welding current induced to copper dies for the fusion of contacted metal. This welding process has welding variables such as current induced in heated and copper dies, the inner diameters of heated dies, and edge shape of the copper dies. Experimental conditions for each current should be established to get successful welding strength. The welding strength could reach to the desired value in industrial fields under the following conditions of contact diameters of heated dies in this case of overlapped aluminum5052 plates with 0.3-mm thickness: inner and outer diameters of 5.0 and 16mm, respectively; diameter of copper dies, 5.0mm; heating current, 6.8kA in heated steel dies; welding current, 8.6 kA in copper dies.

서보건을 이용한 저항 점용접 공정에서의 가압력 패턴에 의한 용접품질 평가 (The Evaluation on Welding Qualities by Gun Press Force Patterns in the RSW (Resistance Spot Welding) Process using Servo Gun)

  • 박영제;조형석;박지환
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.252-252
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    • 2000
  • The Resistance Spot Welding (RSW) has been considered as an inherently safe and reliable method far joining metals, and has been widely employed, especially in automobile body assembly shops, as a manufacturing process. In recent years, the requirement for more sophisticated quality control procedures has considerably grown in the mass production industries. The object of the application of servo control to spot welding gun is the improvement of quality control in the spot welding, one of conventional industrial areas. The important factors affecting welding qualities (shear strength, nuggest size, indentation depth) are welding current, welding time, and gun press force. Welding current and welding time are controlled by welding timer. But, the conventional welding guns using compressed air are out of control in changing gun press forces in welding process. In this paper, a servo gun welding system having a AC servo motor and a PC control system is presented. The main object of this paper is to estimate the influence of gun press force changes in the welding process (press time -> welding time -> hold time) to welding qualities, and to evaluate welding qualities in real time, by recognizing the patterns of gun press forces changed in the welding process and comparing with the standard patterns.

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스테인리스강 Spot 용접부의 산화방지에 관한 연구 (A Study on Anti-Oxidation of Stainless Steel Spot Weld)

  • 허동운;이세헌
    • Journal of Welding and Joining
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    • 제29권5호
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    • pp.58-62
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    • 2011
  • Stainless steels are alloy steels with a nominal chromium content of at least 11 percent, with other alloy additions. The stainlessness and corrosion resistance of these alloy steels are attributed to the presence of a passive oxide film on the surface. When exposed to conditions like Resistance Spot Welding (RSW) process that remove the passive oxide film, stainless steels are subject to corrosive attack. And exposure to elevated temperatures causes oxidation (discoloration) of areas around indentation in Spot welding. In this paper, deal with the effect of shielding gas (Ar) preventing the corrosion, oxidation of stainless steel. And find the optimal shielding gas flow rate. In addition, suggest effective purging method for direct/indirect spot welding process.

가열금형을 사용하는 강철과 알루미늄 이종금속판재의 전기저항 이중스폿용접 (Electric Resistance Double Spot Welding Process of Dissimilar Metal Plates of Steel and Aluminum by Using Heating Dies)

  • 김태현;;진인태
    • 소성∙가공
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    • 제27권1호
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    • pp.37-47
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    • 2018
  • In this paper, a double spot welding process, utilizing electric resistance heating dies, is suggested for the spot welding of dissimilar metal plates for drawing and concurrent spot welding. This double welding process has two heating methods for the fusion welding at the interfacial zone between steel and aluminum plates, such as heating method by thermal conduction of electric resistance by welding current induced to heating dies, and heating method by electric resistance between contacted surfaces of two plates by welding current induced to copper electrode. This double welding process has welding variables such as each current induced in heating dies and in copper electrode, outer diameters of heating dies, and edge shape of copper electrode. Experiments for current conditions in welding process should be demanded in order to get successful welding strength. It was known that the welding strength could be reached to the value demanded on industry fields under such welding conditions as heating dies of outer ring dia.12mm contacted on steel plate, as heating dies of outer ring dia. 14mm contacted on aluminum plate, and as copper electrode of dia. 6.0mm, and as 3 times continuous heating method by $1^{st}$ current of 11 kA(9cycle), $2^{nd}$ current 11 kA(60cycle), $3^{rd}$ current 7 kA(60cycle) applied in steel heating dies and copper electrodes, flat edge of copper electrode, for double spot welding process of dissimilar metal plates of steel and aluminum of 1.0 mm thickness.

Al 도금 HPF 강판과 전기아연도금 TRIP 강판의 저항 점 용접 시 연속타점 전극의 수명에 미치는 도금층의 영향 (Effect of Coating Layer on Electrode Life for Resistance Spot Welding of Al-Coated Hpf and Zn-Coated Trip Steels)

  • 손종우;서종덕;김동철;박영도
    • Corrosion Science and Technology
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    • 제11권1호
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    • pp.29-36
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    • 2012
  • The resistance spot welding of high strength steel degrades the weldability because of its high strength with rich chemical composition and coating layer to protect from corrosion. During the each resistance welding process the electrodes tip reacts with coating layer, then subsequently deteriorates and shorten electrode life. In this study, the Al-coated HPF (Hot Press Forming) steels and Zn-coated TRIP steels were used to investigate the electrode life for resistance spot welding. Experimental results show that the reactivity of Al-coating on HPF steels to electrode tip surface behaviors different from the conventional Zn-coated high strength steels. The electrode tip diameter and nugget size in electrode life test of Al-coated HPF steels are observed to be constant with respect to weld numbers. For Al-coated HPF steels, the hard aluminum oxide layer being formed during high temperature heat treatment process reduces reactivity with copper electrode during the resistance welding process. Eventually, the electrode life in resistance spot welding of Al-coated HPF steels has the advantage over the galvanized steel sheets.

은닉 마르코프 모델을 이용한 저항 점용접 품질 추정에 관한 연구 (A Study on the Quality Estimation of Resistance Spot Welding Using Hidden Markov Model)

  • 김경일;최재성
    • Journal of Welding and Joining
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    • 제20권6호
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    • pp.45-45
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    • 2002
  • This study is a middle report on the development of intelligent spot welding monitoring technology applicable to the production line. An intelligent algorithm has been developed to predict the quality of welding in real time. We examined whether it is effective or not through the In-Line and the Off-Line tests. The purpose of the present study is to provide a reliable solution which can prevent welding defects in production site. In this study, the process variables, which were monitored in the primary circuit of the welding, are used to estimate the weld quality by Hidden Markov Model(HMM). The primary dynamic resistance patterns are recognized and the quality is estimated in probability method during the welding. We expect that the algorithm proposed in the present study is feasible to the applied in the production sites for the purpose of in-process real time quality monitoring of spot welding.

은닉 마르코프 모델을 이용한 저항 점용접 품질 추정에 관한 연구 (A Study on the Quality Estimation of Resistance Spot Welding Using Hidden Markov Model)

  • 김경일;최재성
    • Journal of Welding and Joining
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    • 제20권6호
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    • pp.769-775
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    • 2002
  • This study is a middle report on the development of intelligent spot welding monitoring technology applicable to the production line. An intelligent algorithm has been developed to predict the quality of welding in real time. We examined whether it is effective or not through the In-Line and the Off-Line tests. The purpose of the present study is to provide a reliable solution which can prevent welding defects in production site. In this study, the process variables, which were monitored in the primary circuit of the welding, are used to estimate the weld quality by Hidden Markov Model(HMM). The primary dynamic resistance patterns are recognized and the quality is estimated in probability method during the welding. We expect that the algorithm proposed in the present study is feasible to the applied in the production sites for the purpose of in-process real time quality monitoring of spot welding.

패턴 인식 기법을 이용한 저항 점 용접의 실시간 품질 판단 (Real Time Quality Assurance with a Pattern Recognition algorithm during Resistance Spot Welding)

  • 조용준;이세헌
    • Journal of Welding and Joining
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    • 제18권3호
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    • pp.114-121
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    • 2000
  • Since resistance spot welding has become one of the most popular sheet metal fabrication processes, a strong emphasis is being put on the quality of the welds. Throughout the years many quality estimation systems have been developed by many researchers to ensure weld quality. In this study, the process variables, which were monitored in the primary circuit of the welding machine, are used to estimate the weld quality with Hopfield neural network. The primary dynamic resistance is vectorized and stored as five patterns in the network. As the welding is done, the dynamic resistance patterns are recognized and the quality is estimated with the proposed method. Due to the primary process variables, it is possible to utilize this algorithms as an in-process real time quality monitoring system.

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전기저항 점용접한 자동차 강판의 강도특성평가 (Evaluation on Strength Characteristics of Automobile Steel Sheet by Electrode Resistance Spot Weld)

  • 윤한기;허관도;유덕생
    • 동력기계공학회지
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    • 제17권4호
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    • pp.115-119
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    • 2013
  • The resistance spot welding of high strength steel degrades the weldability because of its high strength with rich chemical composition and coating layer to protect from corrosion. And the weld Expulsion is prone to occur and severely affect the nugget guality when the initial gap between automatic borrowing galvanied steel sheets(SGARC35) and Zn-coateel trip steels(GA580TRIP and GA980 TRIP) exist in resistance spot welding(RSW). RSW is one of the most popular welding processes used to join sheet metals. but weld guality sometimes do creases due to welding condition. in this paper to verity tue weldability using spot welding with the hemispherically concaved electrode, tensile shear strength and cross-tensile strength were measured by a universal test machine. in addition, the nugget size on cross-sectional area of the weld was observed by optical and electron microscopy. As a result, the nugget size of this specimen is increased with increasing welding current and Max load of tensile-shear strength is increased with welding current is increasing.

TCP/IP 기반의 원격 저항 점 용접 품질 모니터링 시스템에 관한 연구 (A Study of Remote Welding Quanlity Monitoring System using TCP/IP in Resistance Spot Welding)

  • 최윤석;이세헌
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.320-323
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    • 2001
  • Nowadays, computer network has been rapidly developed. And we have made efforts to use it in wide field. So we can exchange data without spacial restriction using internet. If we develop monitoring system using internet, we have the effect of reducing time and space. Therefore, in this paper, we developed TCP/IP network and client/server system. And We applied them to resistance spot welding quality monitoring system.

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