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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
Standardization for Temperature Distribution Prediction of the Arc Weld using FEA
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 1~7
Review on the International Joint Researches for Evaluation of Welding Residual Stresses
Kim Jong-Sung ; Park June-Soo ; Jin Tae-Eun ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 8~17
General Guide for Hot Spot Stress Analysis
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 18~28
A Review on the International Effects for the Fatigue Strength Assessment of Welded Structures
Kim Myung-Hyun ; Kim Yoo-Il ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 29~36
Characteristics of Fatigue Crack Propagations with Respect to Loading Directions in Butt-Welded Steel Plates with the Same Direction of Rolling and Welding Bead
Lee Yong-Bok ; Kim Sung-Yeup ; Oh Byung-Duck ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 37~42
Most of the welding steel plate structures have complicated mechanical problems such as rolling directional characteristics and residual stresses caused by manufacturing process. For the enhancement of reliability and safety in those structures, therefore, a systematic investigation is required. SS400 steel plate used for common structures was selected and welded by FCAW butt-welding process for this study, and then it was studied experimently about characteristics of fatigue crack propagations with respect to rolling direction and welding residual stress of welded steel plates. When the angles between rolling direction and tensile loading direction in base material are increased, their ultimate strength not show a significant difference, but yielding strength are increased and elongations are decreased uniformly. It is also shown that fatigue crack growth rate can be increased from those results. When the angles between welding bead direction and loading direction in welded material are increase, fatigue crack growth rate of them are decreased and influenced uniformly according to the conditions of residual stress distribution. In these results, it is shown that the welded steel plate structures are needed to harmonize distributed welding residual stress, rolling direction and loading direction fur the improvement of safety and endurance in manufacture of their structures.
Laser Welding of Seal Tube for Instrumented Irradiation Fuel Test
Kim Soo-Sung ; Lee Chul-Yong ; Kim Woong-Ki ; Park Geun-Il ; Koh Jinh-Yun ; Seo Jun-Seok ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 43~48
This work was carried out to obtain sound welds and to select a most suitable binary metal joint among three different dissimilar binary metal combinations such as Zr-4/Ta, Mo/Ta and Ti/Ta(seal tube/sensor sheath) joints fur the instrumented nuclear fuel irradiation test. To do this, Taguchi experimental method was employed to optimize the experimental data. In addition, metallography, micro-focus x-ray radiography and hardness test were conducted to examine the welds. From the weld bead appearance, penetration depth and bead width as well as weld defects standpoint, Zr-4/Ta joint is suggested for the circumferential joining between a seal tube and a sensor sheath. The optimized welding parameters based on Zr-4/Ta joint are suggested as well.
A Study on the Resistance Welding of Metallic Sandwich Panel : Part 1 - Determination of Process Parameters
Lee Sang-Min ; Kim Jin-Beom ; Na Suck-Joo ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 49~54
Inner Structured and Bonded(ISB) panel, a kind of metallic sandwich panel, consists of two thin skin plates bonded to a micro-patterned inner structure. Its overall thickness is
and it has attractive properties such as ultra-lightweight, high efficiency in stiffness-to-weight and strength-to-weight ratio. In many previous studies, resistance welding, brazing and adhesive bonding are studied for joining the panel. However these methods did not consider productivity, but focused on structural characteristics of joined panels, so that the joining process is very complicated and expensive. In this paper, a new joining process with resistance welding is developed. Curved surface electrodes are used to consider the productivity and the stopper is used between electrodes during welding time to maintain the shape of inner structure. Welding time, gap of electrodes and distance between welding points are selected as the process parameters. By measuring the tensile load with respect to the variation of welding time and gap of electrodes, proper welding conditions are studied. Welding time is proper between 1.5-2.5cycle. If welding time is too long, then inner structures are damaged by overheating. Gap of electrode should be shorter than threshold value fur joint strength, when total thickness of inner structure and skin plate is 3.3mm, the threshold distance is 3.0mm.
A Study on the Resistance Welding of Metallic Sandwich Panel : Part 2 - Process Analysis
Lee Sang-Min ; Kim Jin-Beom ; Na Suck-Joo ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 55~60
In part 1. optimal process parameters such as thickness of stopper and welding time are achieved to produce high strength ISB(Inner Structured and Bonded) panels. Developed process is different from the usual resistance welding process in the number of points welded at a time. In part 2, Numerical modeling for this new process is proposed and the variation of contact area with respect to the gap of electrodes is studied through FE analyses, Besides, it is tried to figure out the welding nugget formation and proper distance between welding points. FE analytic results show that inner structures are melted more than skin plate, and current distribution between points to be welded can be controlled by distance welding points. Comparison of some FE analytic results with corresponding experimental results could confirm the validity of the proposed numerical modeling.
Evaluation of Creep Crack Growth Failure Probability at Weld Interface Using Monte Carlo Simulation
Lee Jin-Sang ; Yoon Kee-Bong ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 61~66
A probabilistic approach for evaluating failure risk is suggested in this paper. Probabilistic fracture analyses were performed for a pressurized pipe of a Cr-Mo steel reflecting variation of material properties at high temperature. A crack was assumed to be located along the weld fusion line. Probability density functions of major variables were determined by statistical analyses of material creep and creep crack growth data measured by the previous experimental studies by authors. Distributions of these variables were implemented in Monte Carlo simulation of this study. As a fracture parameter for characterizing growth of a fusion line crack between two materials with different creep properties,
was employed. And the elapsed time was also normalized with tT, Resultingly, failure probability as a function of operating time was evaluated fur various cases. Conventional deterministic life assessment result was turned out to be conservative compared with that of probabilistic result. Sensitivity analysis for each input variable was conducted to understand the most influencing variable to the analysis results. Internal pressure, creep crack growth coefficient and creep coefficient were more sensitive to failure probability than other variables.
Effect of Spew Fillet on Failure Strength Properties of Natural Fiber Reinforced Composites Including Adhesive Bonded Joints
Yoon Ho-Chel ; Choi Jun-Yong ; Kim Yong-Jig ; Lim Jae-Kyoo ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 67~71
This paper is concerned with a study on fracture strength of composites in an adhesive single lap joint. The tests were carried out on joint specimens made with hybrid stacked composites consisting of the polyester and bamboo natural fiber layer. The main objective of this work was to evaluate the fracture properties adjacent to adhesive bonded joint of natural fiber reinforced composite specimens. From the results, natural fiber reinforced composites have lower tensile strength than the original polyester. But tensile-shear strength of natural fiber reinforced composites with bamboo layer far from adhesive bond is as high as that of the original polyester adhesive bonded joints. Spew filet at the end of the overlap reduced the stress concentration at the bonded area. Spew fillet and position of bamboo natural fiber layer have a peat effect on the tensile-shear strength of natural fiber reinforced composites including adhesive bonded joints.
The Evaluation of STS304 Coating Layer on S45C Substrate by Friction Surfacing Process
Noh Joong-Suk ; Cho Houn-Jin ; Kim Heung-Ju ; Chun Chang-Gun ; Chang Woong-Seong ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 72~76
Friction surfacing of STS304 consumable rod on S45C substrate was investigated by microstructural observation and mechanical tests. STS304 layer formed a strongly-bonded thick layer under a wide range of surfacing conditions. The highest coating eefficiency was obtained in the condition of 1000rpm-2.5mm/sec-2.5mm/sec. The hardness distribution showed the peak value in the boundary layer and as the consumable rotation speed increased, the boundary layer also hardness increasing. As the consumable rotation speed and the traveling speed increased, the coating efficiency tended to decrease. On the other hand, as the feeding speed increased, the coating efficiency appeared to be increased. The new Fe-Cr-Ni alloy layer is showed in the interface layer on
width. After friction surfacing, corrosion resistance of STS 304 surfacing layers were equaled to that of STS304 consumable rod.
Low Temperature Bonding Process of Silicon and Glass using Spin-on Glass
Lee Jae-Hak ; Yoo Choong-Don ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 77~86
Low temperature bonding of the silicon and glass using the Spin-on Glass (SOG) has been conducted experimentally to figure out the effects of the SOG solution composition and process variables on bond strength using the Design of Experiment method. In order to achieve the high quality bond interface without rack, sufficient reaction time of the optimal SOG solution composition is needed along with proper pressure and annealing temperature. The shear strength under the optimal SOG solution composition and process condition was higher than that of conventional anodic bonding and similar to that of wafer direct bonding.
Evaluation of Notch Location Effect on Ductile Crack Initiation at Strength Mismatched Joints by Finite Element Method and Ultrasonic-Mechatronics System
An Gyu-Baek ; Bang Han-Sur ; Toyoda Masao ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 87~92
It has been well hewn that ductile fracture of steels is accelerated by triaxial stresses. The characteristics of ductile crack initiation in steels are evaluated quantitatively using a two-parameters criterion based on equivalent plastic strain and stress triaxiality. The present study focuses on the effects of strength mismatch, which can elevate plastic constraint due to heterogeneous plastic straining, on the critical condition for ductile fracture initiation usinga two-parameter criterion. Fracture initiation testing has been conducted under static loading using notched round bar specimens which had different notch locations. This study provides the fundamental clarification of the effect of strength mismatching and effect of notch location on the critical condition to ductile crack initiation from notch root using fuite element method and ultrasonic-mechatronics system. The critical condition of ductile crack initiation from notch root of strength mismatched tensile specimens under static loading appeared to be almost the same as those of homogeneous tensile specimens with circumferential sharp notch specimen. Also, the effect of notch location in mismatched specimens was estimated using finite element(FE) analyses.
A Characteristics of Zn-Al-Cu System Pb-free Solder Alloys for Ultra High Temperature Applications
Kim Seong-Jun ; Na Hye-Seong ; Han Tae-Kyo ; Lee Bong-Keun ; Kang Cung-Yun ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 93~98
The purpose of this study is to investigate the characteristics of pb-free
solder alloys for ultra high temperature(>573K) which applied to air craft, space satellite, automotive, oil, gas well exploration and data logging of geo-thermal wells. Melting range, solderability, electric resistivity, microstructure and mechanical properties were examined with solder alloys casted in Ar gas atmosphere.
alloys satisfied the optimum melting range of 643 to 673k for ultra high temperature solder. A melting temperature increased with increasing Cu content, but decreased with increasing Al content. The spreadability was improved with increasing hi content. But the content of Cu had no effect on the spreadability. The electric resistivity was lowered with increasing Al and decreasing Cu content. In all Zn-Al-Cu solder alloys, primary dendritic
eutectic and eutectoid phase were observed. The addition of Al increased the volume fraction of eutectic and eutectoid phase and it decreased f phases. Also, the addition of Cu increased slightly the volume fraction of e, the eutectic and eutectoid phases. With increasing total content of Al and Cu, a hardness and a tensile strength were linearly increased, but anelongation was linearly decreased.
The Mixing Ratio Effect of Insert Metal Powder and Insert Brazing Powder on Microstructure of the Region Brazed on DS Ni Base Super Alloy
Ye Chang-Ho ; Lee Bong-Keun ; Song Woo-Young ; Oh In-Seok ; Kang Chung-Yun ;
Journal of Welding and Joining, volume 23, issue 6, 2005, Pages 99~105
The mixing ratio effect of the GTD-111(base metal) powder and the GNI-3 (Ni-l4Cr-9.5Co-3.5Al-2.5B) powder on TLP(Transient Liquid Phase) bonding phenomena and mechanism was investigated. At the mixing ratio of the base metal powder under
, the base metal powders fully melted at the initial time and a large amount of the base metal near the bonded interlayer was dissolved by liquid inter metal. Liquid insert metal was eliminated by isothermal solidification which was controlled by the diffusion of B into the base metal. The solid phases in the bonded interlayer grew epitaxially from the base metal near the bonded interlayer inward the insert metal during the isothermal solidification. The number of grain boundaries farmed at the bonded interlayer corresponded with those of base metal. At the mixing ratio above
, the base metal powder melted only at the surface of the powder and the amount of the base metal dissolution was also less at the initial time. Nuclear of solids firmed not only from the base metal near the bonded interlayer but also from the remained base metal powder in the bonded interlayer. Finally, the polycrystal in the bonded interlayer was formed when the isothermal solidification finished. When the isothermal solidification was finished, the contents of the elements in the boned interlayer were approximately equal to those of the base metal. Cr-W borides and Cr-W-Ta-Ti borides formed in the base metal near the bonded interlayer. And these borides decreased with the increasing of holding time.