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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 22, Issue 6 - Dec 2004
Volume 22, Issue 5 - Oct 2004
Volume 22, Issue 4 - Aug 2004
Volume 22, Issue 3 - Jun 2004
Volume 22, Issue 2 - Apr 2004
Volume 22, Issue 1 - Feb 2004
Selecting the target year
Mechanism and Effects of Welding Residual Stress -Mechanism of Welding Residual Stress-
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 1~2
Fracture Mechanism and Micro-Practography : Fatigue Fractured Surface
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 3~7
Evaluation Method for the Resistance to Hydrogen Induced Cracking
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 8~12
Laser Hybrid Welding and Laser Brazing -State of the Art and Applications in Audi A8 and VW-Phaeton-
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 13~18
Study on the Laser Hybrid Welding Technology for Shipbuilding
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 19~22
Laser-Arc Hybrid Welding Process of Aluminum Alloy
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 23~27
Analysis of Fatigue Durability on Seam Weldment using Notch Stress Approach
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 28~32
Fatigue life at seam weldment of thick plate was estimated using the finite element and FEM-FAT(an exclusive fatigue solver). Finite element meshing at toe and root of weldment was based oil Radaj's theory. Also, the results of FE analysis were compared with experimental results in the point of Miner's Rule. The results of FE and FEM-FAT analysis were in accord with experimental results within 60% confidence. This result reveals that above techniques is useful in assessment of seam weldment and to be an alternative method instead of an object experiment.
A Study on the Mechanical Behavior of Preflex Beam under Different Preflexion Loading Conditions
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 33~37
Since the preflex beam is fabricated by welding, the pre-compressive stresses that should occur over the concrete pier are diminished by the welding residual stresses. For this reason distribution of welding residual stresses must be analyzed accurately and welding residual stresses should be relieved during the fabrication. In this study strain history, displacement of beam and re-distributed welding residual stresses by different loading conditions are measured and compared to choose more appropriate preflex condition.
Evaluation of Flaws in Adhesively Bonded Joint using Ultrasonic Signal Analysis
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 38~45
Ultrasonic signals transmitted through adhesively bonded plates were used to evaluate parameters related to attenuation and frequency in the adhesively bonded joint. The kinds of bonding materials with a different bonding thickness of constant pressure were used. And ultrasonic diagnosis was evaluated by p-wave sensor of 10MHz. FFT has been performed to determine bond-layer parameters such as effective thickness and frequency for adhesively bonded joint of A16061 plates in comparison with measured to theoretical ratios. When variable thickness exists, the ultrasonic spectrum was changed the frequency wave. The more materials thickness and the higher the frequency, the larger shift was observed. Measured ratios for cases of bond thickness and variety bonding materials are then used to determine bond parameters. The results show that the technique can be applied to the characterization of adhesively bonded joint.
Development of Rapid Prototyping Technique using Sheet Metal and Projection Welding
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 46~50
In today's highly competitive marketplace, it is of great significance for the manufacturing industry to reduce lead-time and costs fur the product development. Since first emerged in 1986, Rapid Prototyping (RP) technology has helped successfully to reduce time and costs. Recently, RP using functional materials such as metal has been researched. However RP using the molten metal has been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish, post finishing, etc., that originate primarily from the overall deposition of molten metal for each layer. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. Also tensile and bending specimens were made by the developed RP process using projection welding and were verified.
Residual Stress Redistribution on Welds of Nuclear Component by Mechanical Stress Relieving Methods
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 51~58
Residual stresses, which can be produced during the welding process, play an important role in an industrial field. Welding residual stresses are exerting negative effect on the fatigue behavior and integrity of structure. In this study, as a result of the thermal elasto-plastic finite element analysis for the welds of a nuclear component, the residual stress distributions are estimated for as-welded condition. Also, finite element techniques are developed to simulate the relaxation of the residual stresses according to the various mechanical stress relieving(MSR) loads such as hydrostatic pressure loading, tensile pipe-end loading, and mechanical stress improvement process(MSIP) loading. Finally, the results of residual stress redistributions for various loading conditions are compared and reviewed qualitatively and quantitatively to find an optimum loading condition.
A Study on Hot Ductility Behavior of Ni-based Superalloys
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 59~68
Plasma transferred arc welding (PTAW) has been taken into consideration for repairing Ni-based superalloy components used gas turbine blades. Various cracks has been generally reported to be found in the base metal heat affected zone(HAZ) along grain boundary. Thus, hot cracking susceptibility of Ni-based superalloys was evaluated according to heat treatments. Hot ductility test was conducted on specimens with solution treated at 112
for 2 hours and aging treated at 845
for 24hours after solution treatment. The results of the hot ductility test appeared that solution treated specimens were the highest ductility recovery rate among three conditions. The loss of ductility at high temperature in Ni-based superalloy was mainly controlled by the degree of pain boundary wetting due to constitutional liquation of MC carbide precipitates. Meanwhile, the highest ductility recovery rate in solution-treated alloys seems to be lack of M23C6, which can be dissolved during heating and then result in the local enrichment of Cr in the vicinity of the grain boundary.
Heat Source Modeling of GMAW Considering Metal Transfer
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 69~77
The Gaussian heat source has been widely used to simulate the heat flux of the welding we, and applied to calculating the temperature distribution of a workpiece. The conventional two-dimensional Gaussian heat source for the GMAW is modified in this work by decomposing the arc heat into heats of the cathode and metal transfer. The efficiency and effective arc radius of each heat source are determined analytically for the free-flight mode such as the globular and spray modes. The temperature distribution and weld geometry are calculated using the finite element method, and distribution of the drop heat is found to have significant effects on the penetration. The predicted results show good agreements with the available experimental results, especially with the penetration.
Effects of Manganese and Carbon on the HAZ Microstructural Evolution in Titanium Oxide Steel
Journal of Welding and Joining, volume 22, issue 2, 2004, Pages 78~84
Effects of manganese and carbon on the HAZ microstructural evolution in 500㎫ grade titanium oxide steels were investigated. Microstructural evolution primarily depends on supercooling. When cooled at 3
/s in 0.15%C-1.5%Mn steel, grain boundary and Widmanst tten ferrite formed at 640 and 62
, respectively, followed by competitive formation of acicular ferrite and upper bainite inside of grain at 58
. With an increase of manganese, degree of supercooling increased while critical cooling rate for the formation of gain boundary ferrite decreased. Consequently, the amount of acicular ferrite in HAZ was decreased in 2.0%Mn after initial increase in 1.0 and 1.5%Mn. Therefore, optimum supercooling should be maintained to accelerate acicular ferrite formation in titanium oxide steels. Low carbon steel, 0.11%C-1.5%Mn, showed larger amount of acicular ferrite than higher carbon steel because of effectiveness of diffusionless transformation in low carbon steel.