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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Welding and Joining
Journal Basic Information
Journal DOI :
The Korean Welding and Joining Society
Editor in Chief :
Volume & Issues
Volume 23, Issue 6 - Dec 2005
Volume 23, Issue 5 - Oct 2005
Volume 23, Issue 4 - Aug 2005
Volume 23, Issue 3 - Jun 2005
Volume 23, Issue 2 - Apr 2005
Volume 23, Issue 1 - Feb 2005
Selecting the target year
Life Time Prediction of Contact Tips for GMA Welding
Kim Nam-hoon ; Kim Hee-Jin ; Ryoo Hoi-Soo ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 1~6
Generation Mechanism and Analysis of Welding Distortion
Yang Young-Soo ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 7~11
Prevention and Correction of Welding Deformation
Park Jeong-Ung ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 12~16
Prediction Model for the Microstructure and Properties in Weld Beat Affected Brine : I. Trends in The Development of Model for the Prediction of Material Properties in the Weld HAZ
Moon Joon-Oh ; Lee Chang-Hee ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 17~26
HAZ (Heat Affected Zone) which occurs during welding thermal cycle has an important effect on the mechanical properties of the weld metal. So there were many efforts to develop the model which is able to predict the microstructure and mechanical properties in weld HAZ and lots of metallurgical models have reported since early 1940. These models are justifiable based on the reasonable assumption and analytical approach, but they also have limitation by interesting alloying system and assumption in each literature. Therefore, this study summaries the previous models for prediction of properties in weld HAZ. Then several issues to solve for developing the more reliable model were proposed.
Verification of Quantitative Evaluation Method for Ferritic Weld Metal Microstructure
Kim Ka-Hee ; Kim Hee-Jin ; Ryoo Hoi-Soo ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 27~33
Quantitative evaluation was performed on the microstructure of flux-cored arc(FCA) weld metal using a method blown as IIW scheme. It was mainly intended to figure out any practical difficulties in applying this method and also to provide the consumable makers with basic guide line in developing FCA welding consumables far better properties. Assessment of the experimental results showed IIW scheme was quite reliable in the low heat input range where the acicular ferrite was a major constituent. However, in the high heat input range, some scatter was noticed as the other phases like grain boundary ferrite and Widmansttaten ferrite become dominant. It implies that the accuracy of IIW scheme depends on the faction of microstructural constituents and it become worse as the fraction of latter two phases increases. This tendency was discussed in terms of the characteristics of those two phases. In addition, base line microstructure of rutile type FCA weld metal was addressed for developing new FCA welding consumables intended for higher heat input welding.
Evaluation of Pull Strengths and Fracture Modes of Solder Joino by Modified Ball Pull Testing with Protrusion Jaw
Kim Hyoung-Il ; Han Sung-Won ; Kim Jong-Min ; Choi Myung-Ki ; Shin Young-Eul ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 34~40
There have been numerous approaches to examine the bonding strengths of solder joints. However, despite the technical and practical limitations, the precedent test methods such as the ball shear and ball pull tests are being used in industrial applications. In this study, the optimum jaw pressure with the modified protrusion jaw was introduced in order to obtain higher successful rate f3r ball pull testing. Furthermore, the pull strengths and fracture modes of Sn-8Zn-3Bi, Sn-4Ag-0.7Cu, and Sn-37Pb eutectic solder after isothermal aging tests (
), were evaluated with the protrusion jaw. The pull strength-displacement hysteresis curves and fracture surfaces were carefully investigated to evaluate the correlation between the pull strengths and the fracture modes of each solder. In conclusion, it is verified that Au-Zn IMCs (Intermetallic Compounds) have a detrimental effect on the pull strengths and changed fracture modes of Sn-8Zn-3Bi solder. Meanwhile, the microstructure transformation influences the degradation of pull strengths of Sn-4Ag-0.7Cu and Sn-37Pb solders.
Development of Experimental Model fer Bead profile Prediction in GMA Welding
Son Joon-Sik ; Kim Ill-Soo ; Park Chang-Eun ; Kim In-Ju ; Jeong Ho-Seong ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 41~47
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.
The Effects of Welding Length on the Angular Distortion
Park Jeong-Ung ; Lee Hae-Woo ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 48~52
To estimate welding deformation for large steel structures, either experiment result with small specimen or analysis result of FEM with small numerical model is used. Consequently, it is important to decide the welding length of specimen and numerical model not to have an effect on welding deformation for accurate estimation of whole welding deformation. This study experimentally clarifies the effect of welding length on angular distortion due to welding by varying welding length of specimens, but fixing width and thickness of specimens on V-groove butt welding, fillet welding and bead on plate welding. As a resell the critical welding length on fillet welding and on bead on plate welding is over 500mm and on V-groove butt welding is over 1,000mm.
A DSP System for On-line Monitoring in Laser Welding Using a IR and UV Sensors
Yoon Choong-Sup ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 53~58
We designed a weld monitoring system with UV and IR sensors using a embedded DSP controller for implementing a distribution system; running stand alone and communication with outside by industrial standard protocols. Also this system provided a USB port in order to be acquiring data in PC. The user interface program in PC visualized the IR and W data in time, frequency and state space. A correlation of IR and UV signals showed closely related to weld quality. A rapid change of geometry can be found through a moving average filter. And the average value of IR signal at an interval represented a welding width and depth. Through these results, we proposed a monitoring algorithm for a integer type DSP.
Development of Resistance Spot Weldability Estimation Using Lobe Diagram for Steel Plate of Automobiles
Kim, Tae-Hyung ; Lee, Dong-Ock ; Rhee, Se-Hun ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 59~65
The resistance spot welding is one of the most commonly used welding process for joining the sheet metal in automotive manufacturing process due to higher deposition rates and higher economy achieved. Control variables in the resistance spot welding for achieving high quality are welding current, welding force and welding time. Generally at the manufacturing scene, welding current Vs welding time lobe diagram is used to estimate weldability because controlling welding force is not practical due to economical reasons. However new automotive steel plates have been developed to make lightweight automobiles and to improve resistance against rusting. Also the weldability of these steel plates are worst than the existing steel plates because of changing bare metal and surface plating effect. In consequence of above mentioned reasons, it is necessary to use welding force to present the lobe diagram. In this study, we obtained the welding force Vs welding current lobe diagram for commonly used GA steel plate and found that the second order repression model of tensile shear strength was useful in reducing the number of experiments, and the indentation, and thickness change during welding were used as a response to estimate quantitatively expulsion.
A Study on Development of an Electromagnetic Inductive Sensor for Automatic Weld Seam Tracking
Bae Kang-Yul ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 66~72
An electromagnetic inductive sensor consisted of one exciter and three separated (triple) detectors has been developed for both tracking the weld seam of a workpiece and controlling the sensor-to-workpiece distance (height) simultaneously. The left and right detectors are used to track the seam, while the fore and the other two detectors allow the sensor to determine the height and the gap width by being coupled their outputs together. A series of experiments with the proposed sensor located above a mild steel plate containing a weld seam of gap are carried out to examine the feasibility of the sensor. The results revealed that the proposed sensor could fairly well track the desired seam and also well control the height to be constant even when the gap width of the seam varied. The gap width can be also determined during the seam tracking by using the sensor outputs. As a consequence, these can provide the developed sensor with substantial improvement for industrial uses with respect to the previous electromagnetic sensors being used for the weld seam tracking.
Analysis of Electro-Magnetic Force Acting on Arc Column in Butt-Joint Welding of Mild Steel Plate
Bae Kang-Yul ;
Journal of Welding and Joining, volume 23, issue 4, 2005, Pages 73~80
Arc blow being occurred by Electro-Magnetic force(EMF) during the electric arc welding prevents the formation of a sound weldment. In this study, the effects of arc position, groove size, tack weld and base plate on the EMF in a butt-joint welding of mild steel plate are analyzed by a computer simulation based on the finite element method. The EMF can be numerically identified to be caused by a difference of the magnetic flux-density between ahead of and behind the arc in case that the workpiece locates asymmetrically around the uc. When there exists an air gap of groove ahead of the arc in the welding direction, the similar magnetic force has been producted regardless of the arc position and the gap size. The tack weld alleviates the magnetic force to about one fourth at the finish end of the workpiece. The magnetic force can be also significantly reduced with the base plate to about one fifth at the start end of the workpiece containing a tack weld.