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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 34, Issue 4 - Aug 2016
Volume 34, Issue 3 - Jun 2016
Volume 34, Issue 2 - Apr 2016
Volume 34, Issue 1 - Feb 2016
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Trends of Technology Development of Friction Stir Welding Machine
Kim, Young-Pyo ; Kim, Cheol-Hee ; Kim, Young-Gon ; Joo, Sung-Min ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 1~5
DOI : 10.5781/JWJ.2016.34.3.1
At present, FSW(friction stir welding) process is being considered as an actual way for production of various industrial products. However FSW process involves high temperature and load on the tool during welding. These are make a difference between FSW machine and general machine tools. From this reason, development of FSW machine needs very careful consideration on stiffness of machine structure, spindle and moving axis including machine control system. In this study authors investigate on the trends of technology development of FSW machine in order to share the information for more extension of FSW technology with related researchers and engineers.
Effect of Circumferential Tool Path Control on Friction Stir Spot Welding of Al/Fe Dissimilar Metal Joint
Yoon, Jin Young ; Kim, Cheolhee ; Rhee, Sehun ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 6~11
DOI : 10.5781/JWJ.2016.34.3.6
Joining Al/Fe dissimilar metals is becoming a subject of special interest in the assembly of automotive parts as a trade-off between the weight lightening and the cost reduction. Although various studies have been introduced to join Al alloy with the steel sheet by fusion welding, weak joint strength and galvanic corrosion still remained as problems to be solved. As a solid state welding, friction stir welding has been preferred to fusion welding processes in the dissimilar metal joints. This study investigated friction stir spot welding (FSSW) of Al alloy to the thin steel sheet with a thickness of 0.65 mm. The conventional FSSW is a stationary spot welding process but new approach adopted an additional circumferential movement in company with high speed tool rotation. A full factorial experimental design was implemented, and the main and interaction effects of parameters were analysed on the failure load in the tensile shear test. The direction and radius of rotation were statistically significant parameters and these two parameters affected the joint width and the shape of the hook.
A study on an Interface Tracking Algorithm in Friction Stir Welding based on Computational Fluid Dynamics Analysis
Kim, Su-Deok ; Na, Suck-Joo ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 12~16
DOI : 10.5781/JWJ.2016.34.3.12
Friction stir welding(FSW) was studied using commercial tool, FLOW-3D. The purpose of this study is to suggest a method to apply frictional heat in Computational fluid dynamics(CFD) analysis. Cylindrical tool shape was used, and the interface cells between tool surface and workpiece were tracked by its geometrical relations in order to consider the frictional heat in FSW. After tracking the interface cells, average area concept was used to calculate the frictional heat, which is related to interface area. Also three-dimensional heat source and visco-plastic flow were modeled. The frictional heat generation rate calculated numerically from the suggested algorithm was validated with the analytical solution. The numerical solution was well matched with the analytical solution, and the maximum percentage of error was around 3%.
Effect of Tool Plunge Depth on Weldability of Dissimilar Al5083-O/DP590 Friction Spot Joint
Jeong, Su-Ok ; Bang, Han-Sur ; Bang, Hee-Seon ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 17~22
DOI : 10.5781/JWJ.2016.34.3.17
In terms of mechanical and metallurgical characteristics, the effect of tool plunge depths(0.2, 0.5, 0.7, 1.0, 1.5mm) on weldability in dissimilar Al5083-O/DP590 friction spot joint has been clarified. From the results, it is found that the stirred nugget was stably formed at a plunge depth of more than 0.7mm, which is caused by improved stirring action against each other material. With increasing a plunge depth, the thickness of intermetallic compound(IMC) layer in Al5083-O/DP590 joint has a tendency to increase. The tensile shear strength reaches to the maximum failure load of 6.5kN at a plunge depth of 0.7mm due to relatively small decrease in the thickness of Al5083-O sheet and relatively minute thickness of IMC layer, compared with those of other plunge depth conditions.
Optimizing the Friction Stir Spot Welding Parameters to Attain Maximum Strength in Al/Mg Dissimilar Joints
Sundaram, Manickam ; Visvalingam, Balasubramanian ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 23~30
DOI : 10.5781/JWJ.2016.34.3.23
This paper discusses the optimization of friction stir spot welding (FSSW) process parameters for joining Aluminum alloy (AA6061-T6) with Magnesium alloy (AZ31B) sheets. Prior to optimization an empirical relationship was developed to predict the Tensile Shear Fracture Load (TSFL) incorporating the four most important FSSW parameters, i.e., tool rotational speed, plunge rate, dwell time and tool diameter ratio, using response surface methodology (RSM). The experiments were conducted based on four factor, five levels central composite rotatable design (CCD) matrix. The maximum TSFL obtained was 3.61kN, with the tool rotation of 1000 rpm, plunge rate of 16 mm/min, dwell time of 5 sec and tool diameter ratio of 2.5.
Latest Joining Technology of Metal and Plastic
Kim, Youngsik ; Kil, Sangcheol ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 31~39
DOI : 10.5781/JWJ.2016.34.3.31
The joining technology of the metal and engineering plastic is rising lately as the important issue in concerning with the method of reducing the weight and air pollution of the transportation structure such as automotive and vehicles. The metal/ plastic joining technology has been developed in 2 types of adhesively bonding and direct joining without adhesives. Moreover, in the direct joining method, there are 2 kinds of mechanical joining and welding. This review paper presents the present world wide status and tendency of the development of metal/plastic joining technology. This article intends to offer the materials for development and raising of the domestic metal/plastic joining technology.
Short Circuit Waveform Control Type SMAW Welding Power Source Development and Characteristic Evaluation
Yang, Hyun-Min ; Ryoo, Hoi-Soo ; Hyun, Soong-Keun ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 40~46
DOI : 10.5781/JWJ.2016.34.3.40
The digital controlled SMA welding power source having the hot start current and short circuit waveform control was developed. The inverter power controller was used an analog circuit and the short circuit waveform controller was developed using a 8-bit MCU. For the evaluation of the developed SMA welding power source it were compared with a domestic welding power sources. Using the high titanium oxide type and low hydrogen type electrodes, the characteristics of hot start and short circuit was evaluated. Developed SMA welding power source shows good start performance. Also, arc stability and low current weldability were improved by the short circuit waveform control.
Low Cycle Fatigue Performance of 304L Stainless Steel Weldments
Hwang, JaeHyoen ; Oh, DongJin ; Lee, DoYoung ; Chun, MinSung ; Kim, Myung-Hyun ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 47~51
DOI : 10.5781/JWJ.2016.34.3.47
Recently, the market of liquefied natural gas is growing in accordance with shale gas development and environmentally friendly policies. Also, LNG is in the spotlight as an alternative fuel to previously used fossil fuel and the fuel for the ship to meet emission standards which takes effected by IMO (International Maritime Organization). According to growth of LNG, LNG carriers needs are also expected to increase significantly. This study investigates low cycle fatigue (LCF) performance of 304L stainless steel weldments to investigate fatigue performance in plastic strain region. 304L stainless steel is known to have improved fatigue performance at cryogenic conditions. LCF behavior are investigated by a strain-controlled condition up to 1% strain range and conducted with three different thickness (3mm, 5mm, 10mm). Also, test were performed with three different strain ratio R such as R = -1, -0, 0.5, Finally, the fatigue design curve for 304L stainless steel weldments at room tem- perature are proposed. Considering all test conditions, it is shown that LCF performance have similar tendency regardless of thickness and strain ratio. LCF design curve of 304L stainless steel weldments are lower than 304L stainless steel base metal.
Effects of Post Weld Heat Treatment on Microstructures of Alloy 617 and 263 Welds for Turbines of HSC Power Plants
Kim, Jeong Kil ; Shim, Deog Nam ; Park, Hae Ji ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 52~60
DOI : 10.5781/JWJ.2016.34.3.52
Recently nickel based superalloys are extensively being regarded as the materials for the steam turbine parts for hyper super critical (HSC) power plants working at the temperature over
, since the materials have excellent strength and corrosion resistance in high temperature. In this paper, alloy 617 of solution strengthened material and alloy 263 of
-precipitation strengthened material were prepared as the testing materials for HSC plants each other. Post weld heat treatment (PWHT) was conducted with the gas tungsten arc (GTA) welded specimens. The microstructure of the base metals and weld metals were investigated with Electron Probe Micro-Analysis (EPMA) and Scanning Transmission Electron Microscope (STEM). The experimental results revealed that Ti-Mo carbides were formed in both of the base metals and segregation of Co and Mo in both of the weld metals before PWHT and PWHT leaded to precipitation of various carbides such as Mo carbides in the specimens. Furthermore, fine
particles, that were not precipitated in the specimens before PWHT, were observed in base metal as well as in the weld metal of alloy 263 after PWHT.
A Study of Characteristics on the Dissimilar Metals (Alloy Steel : A387 Gr. 91 - Carbon Steel : A516 Gr. 70) Welds Made with FCA Multiple Layer Welding : Part 1
Shin, Tae Woo ; Jang, Bok Su ; Koh, Jin Hyun ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 61~68
DOI : 10.5781/JWJ.2016.34.3.61
Characteristics of dissimilar metal welds between alloy steel ASTM A387 Gr. 91 and carbon steel ASTM A516 Gr.70 made with Flux cored arc welding(FCAW) have been evaluated in terms of microstructure, mechanical strength, chemical analysis by EDS as well as corrosion test. Three heat inputs of 15.0, 22.5, 30.0kJ/cm were employed to make joints of dissimilar metals with E91T1-B9C wire. Post-weld heat treatment was carried out at
for 2.5 h. Based on microstructural examination, tempered martensite and lower bainite were formed in first layer of weld metal. The amount of tempered martensite was decreased and the amount of lower bainite was increased with increasing heat input and layer. Heat affected zone of alloy steel showed the highest hardness due to the formation of tempered Martensite and lower Bainite. Tensile strengths of dissimilar welds decreased with increasing heat inputs. Dissimilar welds seemed to have a good hot cracking resistance due to the low HCS index below 4. The salt spray test of dissimilar metals showed that the corrosion rate increased with increasing heat inputs due to the increase of the amount of lower Bainite.
A Study of Characteristics on the Dissimilar Metals (ASTM Type 316L - Carbon Steel : ASTM A516-70) Welds Made with FCA Multiple Layer Welding
Kim, Se Cheol ; Hyun, Jun Hyeok ; Shin, Tae Woo ; Koh, Jin Hyun ;
Journal of Welding and Joining, volume 34, issue 3, 2016, Pages 69~76
DOI : 10.5781/JWJ.2016.34.3.69
Characteristics of dissimilar metal welds between ASTM Type 316L and carbon steel ASTM A516 Gr.70 made with FCAW were evaluated in terms of microstructure, ferrite content, EDS analysis, hardness, tensile strength, impact toughness and corrosion resistance. Three heat inputs of 10.4, 16.9, 23.4kJ/cm were employed to make joints of dissimilar metals with E309LMoT1-1 wire. Microstructure of dissimilar weld metals consisted of mostly vermicular type of
-ferrite and some lathy type of
-ferrite was transformed into globular type in reheated zone. In all conditions, weld metals were solidified on FA solidification mode. Based on the EDS analysis of weld metals, All Creq/Nieq values were in the range of FA solidification mode, and it was decreased with increasing heat inputs whereas it was increased with increasing layers. The amount of
-ferrite was decreased with increasing heat input due to the difference of cooling rate, and it was increased with increasing layers. Accordingly, hardness and tensile strength of dissimilar metals weld joints was decreased with increasing heat input while impact energy was increased with increasing heat input. Corrosion test of dissimilar metals weld joints showed that weight gain rate of heat input 10.4kJ/cm was the greatest, and that of three heat inputs became constant after certain time.