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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Welding and Joining
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Journal DOI :
The Korean Welding and Joining Society
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Volume & Issues
Volume 1, Issue 2 - Dec 1983
Volume 1, Issue 1 - Aug 1983
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Study on the Low Fume Electrode of Iron Powder Iron Oxide Type
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 1~6
Maintenance Welding of the Desulfurizer
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 7~11
Welding of Stainless Clad Steel
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 12~20
일본에서의 철강 용접기술의 현황
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 21~33
연강용접 이음의 해수 중에서의 부식피로강도에 대하여
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 34~44
스테인레스강 Overlay 용접부의 Disbonding에 관한 연구 1
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 45~52
Many pressure vessels for the hot H
2/S service are made of 2+1/4Cr-1Mo steel with austenitic stainless steel overlay to combat agressive corrosion due to hydrogen sulfide. Hydrogen dissolves in to materials during operation, and sometimes gives rise to unfore-seeable damages. Appropriate precautions must, therefore, be taken to avoid the hydrogen induced damages in the design, fabrication and operation stage of such reactor vessels. Recently, hydrogeninduced cracking (or Disbonding) was found at the interface between base metal and stainless weld overlay of a desulfurizing reactor. Since the stainless steel overlay weld metal is subjected to thermal and internal-pressure loads in reactor operation, it is desirable for the overlay weld metal to have high strength and ductility from the stand point of structural safety. In section III of ASME Boiler and Pressure Vessel Code, Post-Weld Heat Treatment(PWHT) of more than one hour per inch at over 1100.deg. F(593.deg. C) is required for the weld joints of low alloy pressure vessel steels. This heat treatment to relieve stresses in the welded joint during construction of the pressure vessel is considered to cause sensitization of the overlay weld metal. The present study was carried out to make clear the diffusion of carbon migration by PWHT in dissimilar metal welded joint. The main conclusion reached from this study are as follows: 1) The theoretical analysis for diffusion of carbon in stainless steel overlay weld metal does not agree with Fick's 2nd law but the general law of molecular diffusion phenomenon by thermodynamic chemical potential. 2) In the stainless steel overlay welded joint, the PWHT at 720.deg. C for 10 hours causes a diffusion of carbon atoms from ferritic steel into austenitic steel according to the theoretical analysis for carbon migration and its experiment. 3) In case of PWHT at 720.deg. C for 10 hours, the micro-hardness of stainless steel weld metal in bonded zone increase very highly in the carburized layer with remarkable hardening than that of weld metal.
Efforts of Specimen Sizes on Crack Opening Displacement (COD) for Submerged Arc Weldments of Fine Grained Steel
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 53~60
COD test based on fracture mechanics concept was used in this study to evaluate the fracture toughness quantitatively. Effects of specimen sizes on critical COD value for ABS EH 36 steel and its submerged arc weldments, and the variation of critical COD value depending on metallurgical/mechanical heterogeneities caused by weld thermal cycles were investigated. Experiment was performed by using specimens made from base metal and submerged arc weldments according to BS 5762. Obtained results are summarized as follows; 1) Critical COD value for base metal decreases with increasing thickness of specimen. On hand, as the reduction ratio of critical COD decreases with increasing specimen thickness, critical COD value becomes constant above a thickness of specimen. 2) Critical COD value for weldment decreases with increasing thickness of specimen and was also affected by metallurgical states of base metal. 3) Size effects for weldment was greater at the hardened region. 4) Critical COD value was affected by microstructural change due to weld thermal cycles in weldments; that is, accicular ferrite formation is favorable for increasing of COD value.
Effect of the grain size of temperature dependence on the creep behavior of SUS 316
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 61~68
Austenitic stainless steel has been investigated widely for creep strength of heat resistant material and effects of grain sizes due to various solution treatment time under constant temperature. It was studied that effects of grain sizes subject to solution treatment temperature 1100.deg. C, 1125.deg. C, 1175.deg. C, 1250.deg C, and 1300.deg. C respectively on the creep strength, fracture behaviour and fractography of SUS 316 stainless steel. The experimental results obtained were as follows. 1. The optimum grain size for the maximum creep strength did not vary with creep testing temperatures and stress levels. 2. Among various grain sizes due to different solution treatment temperature, the optimum grain size for the creep strength was found 0.044mm. Also the size showed the minimum initial strain regardless creep temperature. 3. Garofalo's equation of creep rupture life was applied well to SUS 316 stainless steel. 4. The fractography of optimum size was ductile intergranular fracture of dimple type and showed along with the increase of grain size intergranular fracture of w type.
Effects of Initial AE Counts During Plastic Deformation in Friction \elding of Dissimilar Steel Tubes on the Weld Quality Control
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 69~75
Both in-process quality control and reliability of the weld is one of the major concerns is applying friction welding. No reliable nondestructive monitoring method is available at present to determine the weld quality particularly in process of production. So that, this paper presents an experimental examination and quantitative analysis for the effects of initial acoustic emission(AE) counts on the weld strength relating to the rotating speed as a new approach which attempts finally to develop an on-line quality monitoring system design for friction welds using AE techniques. As one of the important results, it was well confirmed that the initial AE counts occurring during plastic deformation period of welding were quantitatively correlated with reliability at 95% confidence level to the joint strength of welds, tube-to-tube (SM 20 C to STS 304) and then an AE technique using the initial AE counts can be reliably applied to in-process strength monitoring of the weld.
Study on the Addition and the Transfer of Alloying Elements in FCAW
Journal of Welding and Joining, volume 1, issue 2, 1983, Pages 76~82
The chemical composition of deposit metal by flux cored arc welding can be easily regulated though addition of deoxidizers and alloying elements in cored flux and fluxes of flux coored wire arc analogous to those of coated electrode. It is necessary to investigate the transfer and yield efficiency due to addition of necessary alloy elements in deposit metal. This report is made to intorduce an experimental equation from the relation between welding condition and extent of penetration, deposit metal and weld melt slag and to estimate transfer and yield efficiency of alloy components in fluxes through chemical analysis of deposit metal.