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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 13, Issue 4 - Dec 1995
Volume 13, Issue 3 - Sep 1995
Volume 13, Issue 2 - Jun 1995
Volume 13, Issue 1 - Mar 1995
Selecting the target year
Welding Specifications and Quality Systems
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 11~22
Welding Standards and Safety for Welded Structures
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 23~30
Welding Standards and Quality in Shipbuilding
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 31~44
Development of Welding Codes and Standards for Power Industry
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 45~50
Application of ASME Code Quality Assurance
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 51~61
Aluminum Vacuum Brazing in Japan
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 62~72
Electron beam welding for Ultra High Vacuum Alminum Chamber
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 73~77
A Study on the Stress Corrosion Cracking Behaviors for Weld Joint of Steel with Various pH Values in Synthetic Sea Water
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 78~88
This paper was performed to study the utility of the SP(small punch) test and the AE(acoustic emission) test in the evaluation of SCC(stress corrosion cracking) susceptibility for parent metal and bond line of HT80 steel-weld joint by SAW(submerged arc welding) with the various pH values. The loading rate used was 3*10
mm/min and the corrosive environment used was synthetic sea water during the SP test and the AE test. According to the test results, the SCC susceptibility of the parent metal was increased in the order of pH6.0, pH8.2 and pH10.0. On the other hand, the bond line showed almost the same high SCC susceptibility in all pH concentrations. Synthetically, from the results of the SCC susceptibility, the macro- and micro-SEM observation, the microfracture behaviors by AE test and the relationship between SCC susceptibility and displacement at incipient failure, .delta.
, it can be concluded that the SP test and the AE test are the good test methods to evaluate the SCC susceptibility for parent metal and bond line of the weld joint with the change of environmental factors.
Evaluation of Reheat Cracking Susceptibility with Simulated Heat Affected Zones in Cr-Mo-V Turbine Rotor Steel
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 89~102
The evaluation of reheat cracking susceptibility in CrMoV turbine rotor steel was performed using thermally simulated heat affected zones. The examinations were carried out in terms of microstructural characterization, microhardness measurement and a Charpy type notch opening three point bend test. It was found that reheat cracking susceptibility increased as the peak temperature increased. This effect was due to the combined effects of the carbide dissolution and unrestricted grain growth at 1350.deg. C peak temperature. Reheat cracking susceptibility was estimated based on microhardness measurement and prior austenite grain size. It was established that for this particular material, reheat cracking in coarse grained heat affected zone can be eliminated if the microhardness is below about 360DPH and the grain size is below about 30.mu.m. It is evident that reheat cracking susceptibility can be eliminated or reduced by carefully controlling the welding parameters such that a refined structure is produced in the coarse grained heat affected zone.
Formation of Ti and Ti ceramics composite layer on aluminium alloy
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 103~114
Plasma Transferred arc(PTA) hard facing process has been developed to obtain an overlay weld metal having excellent wear resistance. The effect of Ti, TiSi
and TiC powders addition on the surface of Aluminum alloy 5083 has been investigated with PTA process. This paper describes the result of test the performance of the overlay weld metal. The result can be summarized as follows 1. Intermetallic compound is formed on surface of base metal in Ti or TiSi
powder but the reaction with surface of base metal is little seen in TiC powder. 2. In formation of composite layer on aluminum alloy surface by plasma transferred arc welding process, high melting ceramics like TiC powder is excellent. 3. The multipass welding process is available for formation of high density of powder. But the more number of pass, the less effect of powder, it is considered, and limits of number of pass. 4. By increasing area fraction of TiC powder on Al alloy surface, in especially TiC powder the hardness increase more than 40% area fraction and 88% shows about Hv 700.
The Influence of the Reflected Arc Light on Vision Sensors for Welding Process Autimation
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 115~126
Vision sensors using the optical triangulation have been widely used for automatic welding systems in various ways, but their reliability is seriously affected by presence of the arc noise. The reliability of vision sensors was analyzed with variation of the arc noise by considering the reflectance of the base metal. first, the properties of the base metal's reflection were modelled by using the Bidirectional Reflectance-Distribution Function(BRDF), and then the variation of the reflected arc intensity was formulated for various configurations of the torch, base metal, and sensor. The experimental data of the gray level of the reflected arc light were obtained for two materials, mild steel and stainless steel. It was found that the results calculated from the proposed model were in good agreement with the experimental data.
Effect of Shielding Gases on the Weldability of High Efficient GMAW Process
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 127~137
The possibility of new GMAW process using economic shielding gases including CO
gas was investigated on the effect of shielding gas on weldabilty. In the optimum welding condition using 600A power source, FCAW process showed low depositions rate, 114 g/min at 300A, but new GMAW using other mixed shielding gases exhibited high deposition rate, 208-224 g/min at 450A. TIME gas, Ar+CO
gas and Ar+CO
gas as a shielding gas were able to be used to the very high welding current(450A), moreover TIME gas and Ar+CO
gas showed the highest arc stability among shielding gases studied in this experiments. The weld penetration was performed by axial spray transfer mode of weld droplet. On the basis of workability, weldability and economic point of view, Ar mixture (80%Ar+20%CO
) gas was recommended as a shielding gas for the development and application of new GMAW process. This shielding gas showed the low spatter, good weld quality, stable arc and low cost at the region of high welding current.
A Study on the Characteristics of Heat Distribution of Welded Joint on the Steel Structure with Thick Plate
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 138~144
Recently, as the industrial structure tends to become large, the thickness of structural plate becomes thicker. Therefore, the thicker the plate of welded structure is, the larger the shape of welded joint. The effect of large heat input makes large heat affected zone(HAZ). These bring to complict welding residual stress and to weaken material, which may cause extremely harm to the safety of structures. Nevertheless, welding is design is regulated by the KS, JIS or standard in the resister of shipping such as KR, ABS or LR. However, these rules are based on rather experimental than theoretical. In this study, the computer program of heat conduction, considering un-steady state and quasi-steady state, is developed for optimizing(minimizing) a shape of welded joint. The characteristics of heat on the welded joints with various shapes are clarified by the results of the analyses.
Laser Beam Welding and Formability of Zn-Coated Steel Plates
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 145~155
Continuous wave C
laser beam welding and formability of zinc coated steel plates were investigated. First, the optimal welding condition could be obtained in lap configuration by using the data for heat input, gap size and fracture behaviour. The gap size for fully-penetrated bead could be predicted by the gap model by Akhter et al. AIso, it was found that the joining efficiency was constant. Secondly, the butt welding of dissimilar materials (zinc coated steel plate and cold rolled steel plate) with different thicknesses was investigated. In the thickness range of 0.8-2.0 mm, the maximum welding speed of 10m/min was obtained. In the butt welding of two plates with thickness 2.0 mm and l.6mm, the maximum, welding speed of 6m/min was obtained, Finally. the forming results of butt-welded plates showed that the joining design was important to apply the laser welded blank in the automotive production.
A Study on Arc Sensor for Weld Seam Tracking by Using Fuzzy Control
Journal of Welding and Joining, volume 13, issue 1, 1995, Pages 156~166
Experimental models which are able to determine the deviation between weld line and weaving center by measuring the weld current during welding were proposed for the gas metal arc welding process. The models were used for developing a weld seam tracking system which controls the weaving speed of a welding torch. However, it was revealed that the tracking result of the system is affected by the welding conditions. Thus an arc sensor system was developed by using fuzzy control approach for overcoming the difficulty of modelling the nonlinear process. The rule base and parameters of the fuzzy control system were determined on the basis of the results of experiments. This fuzzy control system has shown the successful tracking capability for the wide operating range of welding conditions.