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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 15, Issue 6 - Dec 1997
Volume 15, Issue 5 - Oct 1997
Volume 15, Issue 4 - Aug 1997
Volume 15, Issue 3 - Jun 1997
Volume 15, Issue 2 - Apr 1997
Volume 15, Issue 1 - Feb 1997
Selecting the target year
Effect of Welding Residual Stress on Fatigue Crack Propagation Behavior
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 1~11
Residual Stress & Fatigue strenght in Welding Ship Structure
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 12~20
Residual Stress Redistribution and Fatigue Behavior in Weldment
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 20~28
Mechanical Stress Relief Technology and its Application
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 29~35
Dynamic Analysis of Metal Transfer using VOF Method in GMAW (I) - Globular and Spray Transfer Modes
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 36~46
Dynamics of molten drop detachment in the Gas Metal Arc (GMA) welding is investigated using the Volume of Fluid(VOF) method. The electromagnetic effects are included in the formulation of the VOF method which has been widely used to analyze the dynamics of the fluid having a free surface. The molten drop geometry, pressure and velocity profiles within the drop are calculated numerically in the cases of globular and spray transfer modes. It appears that the velocity and current distribution affect metal detachment. It is found that the taper is formed and maintained during the spray transfer by the electromagnetic force. Predicted results show reasonably good agreement with the available experimental data which validates the application of the VOF method to metal transfer analysis.
Dynamic Analysis of Metal Transfer using VOF Method in GMAW (II) - Short Circuit Transfer Mode -
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 47~55
Dynamic characteristics of the short circuit mode are investigated using the Volume of Fluid (VOF) method. When the initial molten drop volume, contact area and wire feed rate are given, rate change of the molten bridge profiles, pressure and velocity distributions are predicted. The electromagnetic force with proper boundary conditions are included in the formulation to consider the effects of welding current. It is found that the molten metal is transferred to the weld pool mainly due to the pressure difference caused by the curvatures in the initial stage, and electromagnetic force becomes dominant factor in the final stage of short circuit transfer. Necking occurs at the contact position between the molten drop and weld pool, and the initial molten drop volume and welding current have significant effects on break-up time.
A Study on Transverse Cracking and Fatigue Properties of 50mm Thick FACW Weld Metal ; Effects of Preheating and Interpass Temperature
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 56~64
Macrostructural characteristic of the transverse cracks and fatigue behavior were studied for EH 32 TMCP 50mm thick plate welded with FACW under the variation in preheat and interpass temperatures. Transverse cracks were detected in specimen welded with preheat and interpass temperature below
, but cracks were not detected in the specimens welded with preheat and interpass temperatures at the range of
.C. The location of crack formation was found to strongly depend upon the thickness of weld layers as regard to the plate thickness.
and Al Coantent on the Weld Penetration
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 65~78
The effect of
and Al contents and the variation of welding parameters such as arc currents, welding speed on the weld penetration was investigated. Examination of weld penetration using GTAW was accomplished in the ferritic STS410L and austenitic STS304. Good penetration could be controlled by the variation of
and Al contents in STS304. However, influences of
and Al contents on the ferritic STS410L are far less than those on the austenitic STS304. Welding parameters should be considered first before controlling
and Al contents for a good penetration in ferritic STS410L. In the simulation study under the stationary heat sources, the results of simulation and experiment have a similar tendency.
A Study on the Electrom Beam Weldability of 9%Ni Steel (I) - Penetration and Electron Beam Characteristics -
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 79~87
This study was performed to evaluate basic characteristics of electron beam welding process for a 9% Ni steel plate. The principal welding process parameters, such as working distance, accelerating voltage, beam current and welding speed were investigated. The AB (Arata Beam) test method was also applied to characterize beam size and energy density of the electron beam welding process. The electron beam size was found to decrease with the increase of accelerating voltage and the decrease of working distance. So, in case of high voltage (150kV), spot size and energy density of electron beam were revealed to be 0.9mm and
respectively. The accelerating voltage among the welding parameters was found to be the most important factor governing the penetration depth. When the accelerating voltage of electron beam was low (
90kV), beam current and welding speed did not affect on the penetration depth significantly. However, in case of high voltage (
120kV), the depth of penetration increased very sensitively with the increase of beam current and the decrease of welding speed.
A study on the electrom beam weldability of 9%Ni steel (II) - Effect of
parameter on bead shape -
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 88~98
Welding defects, such as porosity and spike, have sometimes occurred in deep penetration electron beam welds. These defects are known to be one of the serious problem in electron beam welds. So, effects of active parameters (
) on bead shape and occurrence of defects in electron beam welds of heavy section 9%Ni steel plates were investigated. Partial penetration welding in flat position, and deep penetration welding of 10 ~ 28mm depth were investigated in this study. It is desirable to select low accelerating voltage and above the surface focus position
1.2 at which a wine-cup shaped bead is obtained to avoid the welding defects such as spike and root porosity. When the accelerating voltage of electron beam was low (90kV), active parameter (
) did not influence on the bead width, penetration depth and weld defects significantly. However, in case of high voltage (
120kV), active parameter (
) was sensitively associated with penetraton depth and weld defects, i.e. when the active parameter ((
) was in the range of 0.6 to 1.0, the depth of penetration was always over the target (23mm), while the depth of penetration was dramatically decreased with further increase of active parameter (
). The weld defects were decreased with the increase of active parameter
resulting in the decrease of energy density of the focused beam in the root part of fusion zone.
Investigation of the Properties of Laser-Welded Amorphous Metal in a Deep Frozen Environment
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 99~108
For the conventional welding method, the high heat transfer makes the crystallization of the work material unavoidable. Whereas the laser is able to weld the amorphous metal without a crystallized zone, because heat transfer is limited withn a very small restricted volume. In this paper, the possibilities and the limits of the laser welding in a deep frozen environment by liquid nitrogen were studied to utilize the advantageous properties of amorphous metal foils. The author investigated, after laser welding in a deep frozen environment with a solid state laser (Nd:YAG-laser), the achievable strengths and the influences of the laser beam parameters on the strengths.
The determination of transducer location and ultrasonic wave propagation through temperature gradients in fillet are welding
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 109~117
The temperature gradient in weldment changes the transit time and distorts the direction of the ultrasound beam to the higher temperature regions due to the lower sound speed in the hotter regions of the weldment. This paper describes a ray-tracing method for calculating the effects of temperature gradients on ultrasonic propagation in fillet arc weldig. In the method, weldment is conceptually devided into a number of layers and the refraction and sound speed at each layer is calculated using the temperature which calculated from analytical solution. Calculating the time and location of echoes arrived from various interfaces around a molten weld pool determines the optimum location of ultrasonic transducers and the correct position of flaws.
A DEVELOPMENT OF MATHEMATICAL MODELS FOR PREDICTION OF OPTIMAL WELD BEAD GEOMETRY FOR GMA WELDING
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 118~127
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.
Reaction diffusion and formation of
phase at the Ni-NiAl diffusion couple
Journal of Welding and Joining, volume 15, issue 3, 1997, Pages 128~135
Reaction diffusion and formation of
structure have been studied in temperature range of 1432K to 1573K using the diffusion couple of (Ni-40, 5at%Al)/(Ni-14, 1at%Al) and (Ni-49, 2at%Al)/ (Nickel). The layer growth of Ni
Al pyhase in the annealed diffusion couple was measured by optical microscope and electron probe microanalyzer (EPMA). The layer growth of
phase in diffusion zone obeyed the parabolic law without any indication of grain boundary effects. The layer growth of
phase in temperature range of 1423K to 1573K was mainly controlled by the volume diffusion mechanism. The rate of layer growth of
phase was found to be colsely related to the composition of intermetallic compound NiAl phase. The activation energy for layer growth of
phase was calculated to be 127kJ/mol.