• 제목/요약/키워드: GMA Welding Process

검색결과 114건 처리시간 0.028초

GMA 용접에 최적의 용접비드 형상을 예측하기 위한 수학적 모델 개발 (A DEVELOPMENT OF MATHEMATICAL MODELS FOR PREDICTION OF OPTIMAL WELD BEAD GEOMETRY FOR GMA WELDING)

  • 김일수
    • Journal of Welding and Joining
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    • 제15권3호
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    • pp.118-127
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    • 1997
  • With the trend towards welding automation and robotization, mathematical models for studying the influence of various variables on the weld bead geometry in gas metal arc (GMA) welding process are required. Partial penetration, single-pass bead-on-plate welds using the GMA welding process were fabricated in 12mm mild steel plates employed four different process variables. Experimental results has been designed to investigate the analytical and empirical formulae, and develop mathematical equations for understanding the relationship between process variables and weld bead geometry. The relationships can be usefully employed not only for open loop process control, but also for adaptive control provided that dynamic sensing of process output is performed.

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GMA용접에서 비드단면형상을 예측하기 위한 실험적 모델의 개발 (Development of Experimental Model fer Bead profile Prediction in GMA Welding)

  • 손준식;김일수;박창언;김인주;정호성
    • Journal of Welding and Joining
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    • 제23권4호
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    • pp.41-47
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    • 2005
  • Generally, the use of robots in manufacturing industry has been increased during the past decade. GMA(Gas Metal Arc) welding process is an actively Vowing area, and many new procedures have been developed for use with high strength alloys. One of the basic requirement for the automatic welding applications is to investigate relationships between process parameters and bead geometry. The objective of this paper is to develop a new approach involving the use of neural network and multiple regression methods in the prediction of bead geometry for GMA welding process and to develop an intelligent system that visualize bead geometry in order to employ the robotic GMA welding processes. Examples of the simulation for GMA welding process are supplied to demonstrate and verify the proposed system developed using MATLAB. The developed system could be effectively implemented not oかy for estimating bead geometry, but also employed to monitor and control the bead geometry in real time.

Al 5052, 6061합금에 대한 플라즈마-GMA 용접공정특성 평가 (Process Evaluation of Plasma-GMA Welding for Al 5052 and 6061 Alloy)

  • 김철희;안영남;최진강;이세헌
    • Journal of Welding and Joining
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    • 제28권6호
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    • pp.58-62
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    • 2010
  • In this study, the bead-on-plate welding were conducted by using GMA welding and plasma-GMA welding on Al 5052 and, Al 6061 plates. For these processes, the maximum welding speeds for full penetration were compared, and various weld qualities such as bead appearance, cross-section, cracks and porosities were examined. Faster welding speed, cleaner bead surface and more stable drop transfer could be achieved by plasma-GMA welding, compared with GMA welding.

로봇 아아크 용접에서 비드 형상에 공정변수들을 예측하기 위한 새로운 알고리즘 (A New Algorithm for Predicting Process Variables on Welding Bead Geometry for Robotic Arc welding)

  • 김일수
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1997년도 춘계학술대회 논문집
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    • pp.36-41
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    • 1997
  • With the trend towards welding automation and robozation, mathematical models for studying the influence of various parameters on the weld bead geometry in Gas Metal Arc(GMA) welding process are required. The results of bead on plate welds deposited using the GMA welding process has enabled mathematical relationships to be developed that model the weld bead geometry. Experimental results were compared to outputs obtained using existing formulae that correlate process input variables to output parameters and subsequent modelling was performed in order to better predict the output of the GMA welding process. The aim of this work was to explain the relationships between GMA welding variables and weld bead geometry and thus, be able to predict input weld bead size. The relationships can be usefully employed for open loop process control and also for adaptive control provided that dynamic sensing of process output is performed.

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GMA 용접에서 실시간 비드폭 예측에 관한 연구 (A Study on Real-time Prediction of Bead Width on GMA Welding)

  • 손준식;김일수;김학형
    • Journal of Welding and Joining
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    • 제25권6호
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    • pp.64-70
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    • 2007
  • Recently, several models to control weld quality, productivity and weld properties in arc welding process have been developed and applied. Also, the applied model to make effective use of the robotic GMA(Gas Metal Arc) welding process should be given a high degree of confidence in predicting the bead dimensions to accomplish the desired mechanical properties of the weldment. In this study, a development of the on-line learning neural network models that investigate interrelationships between welding parameters and bead width as well as apply for the on-line quality control system for the robotic GMA welding process has been carried out. The developed models showed an excellent predicted results comparing with the predicted ability using off-line learning neural network. Also, the system will extend to other welding process and the rule-based expert system which can be incorporated with integration of an optimized system for the robotic welding system.

GMA 용접공정을 이용한 오픈갭 수평고정관 초층 용접의 실험적 연구 (An Experimental Study on Root-pass Welding of Open Gap by GMA Welding Process in Pipeline)

  • 김지선;김일수;박창언;나현호;이지혜;정성명
    • Journal of Welding and Joining
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    • 제29권3호
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    • pp.64-69
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    • 2011
  • Since welding process for most pipelines with large diameter has been carried out by the manual process, automation of the welding process is necessary for the sake of consistent weld quality and improvement in productivity. Therefore the development of the optimized algorithm to decide the welding condition is an effective technique to prove the feasibility of interface standards and intelligent control technology to increase productivity and reduce the cost of system integration. In this study, the pipe welding experiment has been carried out using plused GMA welding process to select optimal welding condition. And necessary information in root-pass welding has been obtained by applying in the pipeline using the selected welding conditions through the welding experiment.

수직 GMA 용접공정 입열량에 따른 용접부 경도특성에 대한 실험적 연구 (An Experiment Study for Hardness Characteristic of Weldment according to Welding Heat-Input of Vertical GMA Welding Process)

  • 박민호;이종표;진병주;김인주;김지선;김일수
    • Journal of Welding and Joining
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    • 제35권2호
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    • pp.35-42
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    • 2017
  • The GMA welding process involves large number of interdependent variables which may affect product quality, productivity and cost effectiveness. The relationships between process parameters for a vertical weldment and mechanical properties are complex because a number of process parameters are involved. To make the vertical-position welding, a method that predicts bead geometry and accomplishes the desired mechanical properties of the weldment should be developed. In addition, a reliable welding process and conditions must be implemented to reduce weld structure failure. In this study, the welding process analysis of investigates the interaction between the heat input and welding parameter(Welding current, Arc voltage, Welding speed) for predicting the weldment hardness.

유전자 알고리즘을 이용한 GMA 필릿 용접 비드형상 예측에 관한 연구 (A Study on Bead Geometry Prediction the GMA Fillet Welding using Genetic Algorithm)

  • 김영수;김일수;이지혜;정성명;이종표;박민호
    • Journal of Welding and Joining
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    • 제30권6호
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    • pp.126-132
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    • 2012
  • The GMA welding process involves large number of interdependent variables which may affect product quality, productivity and cost effectiveness. The relationships between process parameters for a fillet joint and bead geometry are complex because a number of process parameters are involved. To make the automated GMA welding, a method that predicts bead geometry and accomplishes the desired mechanical properties of the weldment should be developed. The developed method should also cover a wide range of material thicknesses and be applicable for all welding position. For the automatic welding system, the data must be available in the form of mathematical equations. In this study a new intelligent model with genetic algorithm has been proposed to investigate interrelationships between welding parameters and bead geometry for the automated GMA welding process. Through the developed model, the correlation between process parameters and bead geometry obtained from the actual experimental results, predicts that data did not show much of a difference, which means that it is quite suitable for the developed genetic algorithm. Progress to be able to control the process parameters in order to obtain the desired bead shape, as well as the systematic study of the genetic algorithm was developed on the basis of the data obtained through the experiments in this study can be applied. In addition, the developed genetic algorithm has the ability to predict the bead shape of the experimental results with satisfactory accuracy.

시스템 식별을 이용한 GMA 용접 시스템의 동적 제어 모델링과 용융지폭 제어 (Dynamic control modeling of the GMA welding system using the system identification and weld pool width control)

  • 김동철;이세헌;엄기원
    • 한국정밀공학회지
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    • 제14권4호
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    • pp.97-103
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    • 1997
  • Designing a feedback controller requires a dynamic model of the process to be controlled. But the GMA welding process models have not been fully developed for many reasons such as complexity of the welding process and lack of reliable sensors. Because of the complexity of the welding system, we obtained a dynamic model for control using system identification routines, rather than derived a model from fundamental physical laws. The controller was designed based on the experimentally derived linear dynamic model of the welding process. In order to demonstrate application of the designed controller, the simulation was carried out.

Mathematical Models for Optimal Bead Geometry for GMA Welding Process

  • Park, C.E.;Li, C.S.;Kim, I.S.
    • International Journal of Korean Welding Society
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    • 제3권1호
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    • pp.8-16
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    • 2003
  • A major concern in Gas Metal Arc (GMA) welding process is the determination of welding process variables such as wire diameter, gas flow rate, welding speed, arc current and welding voltage and their effects on the desired weld bead dimensions and shape. To successfully accomplish this objective, 81 welded samples from mild steel AS 1204 flats adopting the bead-on-plate technique were employed in the experiment. The experimental results were used to develop a mathematical model to predict the magnitude of bead geometry as follows; weld bead width, weld bead height, weld bead penetration depth, weld penetration shape factor, weld reinforcement shape factor, weld bead total area, weld bead penetration area, weld bead reinforcement area, weld bead dilution, length of weld bead penetration boundary and length of weld bead reinforcement boundary, and to establish the relationships between weld process parameters and bead geomery. Multiple regression analysis was employed for investigating and modeling the GMA process and significance test techniques were applied for the interpretation of the experimental data.

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