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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 31, Issue 6 - Dec 2013
Volume 31, Issue 5 - Oct 2013
Volume 31, Issue 4 - Aug 2013
Volume 31, Issue 3 - Jun 2013
Volume 31, Issue 2 - Apr 2013
Volume 31, Issue 1 - Feb 2013
Selecting the target year
Evaluation of Property and Reliability of Sn3.5Ag and Sn0.7Cu Pb-free Solder Joint by Complex Vibration for Application of Automobile Electric Module
Ko, Young-Ho ; Bang, Jung-Hwan ; Kim, Jeong-Han ; Lee, Chang-Woo ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 6~10
DOI : 10.5781/KWJS.2013.31.1.6
Recent Study of Overlay Welding on Welding methods
Yoo, Ho-Cheon ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 11~20
DOI : 10.5781/KWJS.2013.31.1.11
Recent developing tendency of overlay welding on welding methods are studied by searching of NDSL, ScienceDirect and KIPRIS. PTA, Laser cladding, SMAW, GTAW, GMAW, SAW and ESW are selected as welding methods. Development and improvement of various new overlay welding processes and technology are introduced, especially PTA and Laser cladding in abroad overlay welding technology are activated substantially.
High Current Arc Welding Technology of Aluminum Alloy
Choi, Young-Bae ; Kang, Mun-Jin ; Kim, Dong-Cheol ; Hwang, In-Sung ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 21~25
DOI : 10.5781/KWJS.2013.31.1.21
Aluminum alloy, Al5083-O, is one of candidate materials for the LNG storage tank, because of its excellent weldability, cryogenic characteristics, and corrosion resistance. The good weldability of Al5083-O is very important in LNG storage tank manufacturing. In this study, high current metal inert gas(MIG) welding process was used to get one pass welding of thick plate aluminum alloy. Bead on plate(BOP) welding was performed to evaluate the effect of welding conditions on the height of bead and depth of penetration. The optimum welding conditions were derived to get one pass welding of the thickness of 14.5mm. The mechanical properties of the welded joint were evaluated. The cross-sectional macro test, tensile test, and bending test satisfied the class rule.
Technology on Arc Welding Machine of Aluminum by Digital Control
Lee, Chang-Je ; Kim, Yu-Chan ; Kim, Jong-Do ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 26~32
DOI : 10.5781/KWJS.2013.31.1.26
Recently, welding technology of nonferrous metals which were difficult to implement by arc welder has become available through digitalization of arc welding machine. Among them, the welding quality improvement of aluminum welding is very noticeable. These results increase the arc stability by controlling arc current and voltage waveform precisely, and control wire feed speed by synchronizing with arc current which the feed rate of filler wire is controlled by a precise motor control of servomotor and not by a simple constant speed feeding. Not only through the hardware digitalization of arc welding machine but also through advance of software of arc welding, it became possible to implement a certain level of welding quality by a simple operation. These led to CMT welding process implementation which requires low heat input than current arc welding and highly increased the applicability of the aluminum welding.
Technologies for Robotized Welding of Big Aluminium Structures with Tolerances for High Speed Trains
Lee, Sang Chul ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 33~37
DOI : 10.5781/KWJS.2013.31.1.33
Robotized MIG welding of large aluminium components for high speed trains is state-of-the-art. The implementation of online laser cameras enables seam tracking and adoptive modification of welding parameters. A constant fill is achieved regardless of the gap tolerances. Friction Stir Welding has been introduced to the market as a reliable and fast joining technology. The advantages of high welding speeds and the elimination of arc light, fumes and liquefaction in the welding spot lead to economical realisation of heavy-duty gantry systems. FSW robots offer a high flexibility with regard to welding of curved parts, and can be equipped with laser cameras for exact joint tracking.
Shielding Gases for Welding Aluminum
Steyer, Douglas ; Jun, Baesoo ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 38~42
DOI : 10.5781/KWJS.2013.31.1.38
In the welding of aluminum, it is important to provide a stable gas shield to exclude not only oxygen, but any sources of hydrogen, from the arc environment. Common sources of hydrogen are humidity in the air around the arc, moisture in the shielding gas, and residual lubricants on the surface of the welding consumable. Since molten aluminum can absorb seventy times more hydrogen than solid aluminum, as the aluminum cools, it releases hydrogen that then becomes trapped in the form of hydrogen bubbles in the solidifying metal.
Analysis of Microstructure for Resistance Spot Welded TRIP Steels using Atomic Force Microscope
Choi, Chul Young ; Ji, ChangWook ; Nam, Dae-Geun ; Jang, Jaeho ; Kim, Soon Kook ; Park, Yeong-Do ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 43~50
DOI : 10.5781/KWJS.2013.31.1.43
The spot welds of Transformation Induced Plasticity (TRIP) steels are prone to interfacial failure and narrow welding current range. Hard microstructures in weld metal and heat affected zone arenormally considered as one of the main reason to accelerate the interfacial failure mode. There fore, detailed observation of weld microstructure for TRIP steels should be made to ensure better weld quality. However, it is difficult to characterize the microstructure, which has similar color, size, and shape using the optical or electron microscopy. The atomic force microscope (AFM) can help to analyze microstructure by using different energy levels for different surface roughness. In this study, the microstructures of resistance spot welds for AHSS are analyzed by using AFM with measuring the differences in average surface roughness. It has been possible to identify the different phases and their topographic characteristics and to study their morphology using atomic force microscopy in resistance spot weld TRIP steels. The systematic topographic study for each region of weldments confirmed the presence of different microstructures with height of 350nm for martensite, 250nm for bainite, and 150nm for ferrite, respectively.
Evaluation of the Stress Occurring Phenomenon for Cold-Rolled Carbon Steel During a Laser Welding Process
Lee, Chulku ; Lee, Wooram ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 51~57
DOI : 10.5781/KWJS.2013.31.1.51
Residual stress caused in the weldments with high restraint force are often observed during welding in the weldments of Inner and outdoor materials or radial tanks. The reason is that quantitative analysis about thermal stresses during laser welding is lacking for this weldments. To verify Finite Elements Method (FEM) theory, the temperature was measured with thermocouple in a real time in this paper. Also analysis of the thermal stress for welding condition is performed by Comsol program package on various welding condition in SCP1-S butt welding. The principal stress in laser welding process is seen through the width direction. Also, it was confirmed that a change in base metal by thermal expansion made the stress in width direction stronger. Base metal close to the weld bead as the process progresses to the tensile stress in the compressive stress was varied. It was shown that the change of stress was quantitative from the bead at a certain distance.
Microstructure and Tensile Strength Property of Arc Brazed DP steel using Cu-Sn Insert Metal
Cho, Wook-Je ; Cho, Young-Ho ; Yun, Jung-Gil ; Kang, Chung-Yun ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 58~64
DOI : 10.5781/KWJS.2013.31.1.58
The following results were obtained, microstructures and tensile properties in arc brazed joints of DP(dual phase) steel using Cu-5.3wt%Sn insert metal was investigated as function of brazing current. 1) The Fusion Zone was composed of
and Cu23Sn2. The reason for the formation of these solid solutions. Despite, Fe & Cu were impossible to solid solution at room temperature. It`s melting & reaction to something of insert metal & Base Metal (DP Steel) by Arc. Brazing Process has faster cooling rate then Cast Process, Supersaturated solid solution at room temperature. 2) The increase Hardness of Fusion Zone was directly proportional to the rise of welding current. Because,
phase (higher hardness than the Cu23Sn2.(104.1Hv < 271.9Hv)) Volume fraction was Growth, due to increasing the amount of base metal melting by High current. 3) The results of tensile shear test by Brazing, All specimens happen to fracture in Fusion Zone. On the other hand, when Brazing Current increasing tend to rise tensile load. but it was very small, about 26-30% of the base metal. 4) The result of fracture analysis, The crack initiate at Triple Point for meet to Upper B.M/Under B.M/Fusion Zone. This Crack propagated to Fusion zone. So ruptured by tensile strength. The Reason to in the fusion zone fracture, Fusion zone by Brazing of hardness (strength) was very lower then the base metal (DP steel). In addition the Fusion Zone`s thickness in triple point was thin than the base metal`s thickness in triple point.
Process Parameter Effect on Deformation of a V-groove Thin Plate for FCAW and EGW
Han, Juho ; Jeon, Jaeseung ; Park, Chulsung ; Oh, Chongin ; Yun, Jinoh ; Lee, Jeongsoo ;
Journal of Welding and Joining, volume 31, issue 1, 2013, Pages 65~70
DOI : 10.5781/KWJS.2013.31.1.65
Finite element analysis and welding experiments were performed to evaluate deformation aspect for Flux Cored Arc Welding(FCAW) and Electro Gas Welding(EGW). Numerical researches of FCAW and EGW were performed considering the difference of number of welding pass and welding direction to arc flow. To perform the numerical study of FCAW and EGW, number of welding pass and welding direction to arc flow were considered in the finite element model. FCAW process requires multi pass and its welding direction is vertical to welding torch. On the other hand, EGW process requires single pass and its welding direction is parallel to welding torch. The difference of welding direction and heat input was considered in the finite element analysis. In FCAW process, Goldak`s double ellipsoidal heat input model was adopted. In the EGW process, Hemi-spherical power density distribution was adopted. In the results of experiment and finite element analysis, angular deformation of FCAW process is larger than that of EGW process.