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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
Recent Technological Tendency of Laser/Arc Hybrid Welding
Kim, Youngsik ; Kil, Sangcheol ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 4~15
DOI : 10.5781/KWJS.2013.31.2.4
The laser/arc hybrid welding process is a new process combining the laser beam and the arc as welding heat source. The laser beam and arc influence and assist one another. By application of hybrid welding, synergistic effects are achievable, and disadvantage of the respective processes can be compensated. The laser-arc hybrid welding process has good potential to extend the field of applications of laser technology, and provide significant improvements in weld quality and process efficiency in manufacturing applications. This review analyses the recent advances in the fundamental understanding of hybrid welding processes using the works of the data base of Web of Science (SCI-Expanded) since the 2000 year. The research activity on the hybrid welding has been become more actively since 2006, especially in China, presenting the most research papers in the world. Since the hybrid welding process was adopted in manufacturing of the automobile in Europe in the early of 2000`s, its adopting is widely expanded in the field of manufacturing of automobile, ship building, steel construction and the other various industry. The hybrid welding process is expected to advance toward higher productivity, higher precision, higher reliability through the mixing of high power and flexible fiber laser or disk laser and digitalized pulsed arc source.
Recent Trends of Friction Stir Welding of Titanium
Chun, Chang-Keun ; Kim, Sung-Wook ; Kim, Heung-Joo ; Chang, Woong-Seong ; Noh, Joong-Suk ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 16~20
DOI : 10.5781/KWJS.2013.31.2.16
Titanium and its alloys have been widely using in the various field of industry application due to high corrosion resistant properties and mechanical properties. Titanium is highly reactive in the high temperature state and the formation of titanium oxide and porosities in the nuggets of fusion welding will results in the degradation of the mechanical properties. For this reason the studies of friction stir welding for titanium have been investigated recently. The FSW zones of titanium were classified by the weld nugget (WN), the linear transition boundary (TB) and the heat affected zone (HAZ). The WN along with titanium parent was characterized by the presence of twins and dislocations. The average grain size and hardness of WN has been changed according to heat input. The grain refinement resulted from the FSW increased the hardness in the stir zone. Sound dissimilar joints between SUS 304 and CP-Ti were achieved using an advancing speed of 50 mm/min and rotation speeds in the range of 700-1100 rpm. Aluminum 1060 and titanium alloy Ti-6Al-4V plates were lap joined by friction stir welding, hence the ultimate tensile shear strength of joint reached 100% of Al 1060. Mg alloy and Ti were successfully butt joined by inserting a probe into the Mg alloy plate with slightly offsetting. But Ti-Al intermetallic compound layers formed at the interface of these joints.
Researches in Corrosion Resistance of Friction Stir Welded Aluminum alloys
Ahn, Byung-Wook ; Choi, Don-Hyun ; Yeon, Yun-Mo ; Jung, Seung-Boo ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 21~25
DOI : 10.5781/KWJS.2013.31.2.21
Aluminum alloys have been considered for substantial use in these industries. This ensues from their attractive strength to weight ratio, superb formability, apposite weldability and acceptable corrosion resistance. Depending on the specific application, corrosion behavior is a significant factor of a welded joint. In this study, recent researches in the view of corrosion resistance of friction stir welded aluminum alloys are briefly reviewed.
Recent Research & Development Trend on Friction Stir Welding and Friction Stir Processing
Lee, Kwang-Jin ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 26~29
DOI : 10.5781/KWJS.2013.31.2.26
The latest research & development trend on friction stir welding and friction stir processing technologies presented in the international symposium, `Friction Stir Welding & Processing VII`. Papers and presentations about high temperature materials such as advanced high strength steel, stainless steel and titanum alloy shoot up this year. Papers on modeling of metal flow and control of process parameters also increased. The FSP technologies for manufacturing of carbon materials reinforced metal matrix composites were reported, too.
A Study on Laser Weldability of Al-Si Coated 22MnB5 Steel for TWB Hot Stamping
Kim, Yong ; Park, Ki-Young ; Lee, Bo-Young ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 30~36
DOI : 10.5781/KWJS.2013.31.2.30
Recently the use of ultra high strength steels(UHSS) in structural and safety component is rapidly increasing in the automotive industry. Furthermore, it commonly use in tailor welded blank laser welding process before hot stamping to reduce lightweight vehicle. However TWB process is to be a problem about welded strength after hot stamping because it`s welded before heat treatment. Therefore, in this study, laser welds of TWB after heat treatment were analyzed for changes in the characteristics, especially the impact on the oxidation and decarburization in order to prevent pre-coated Al-Si layer welds on the properties for intensive investigation. As a result, the degradation of the TWB weldments changes in the heat treatment conditions alone, without any pre-treatment of the coating layer has confirmed that there is a limitation on the improvement. Furthermore Al-Si elements are overall distributed on the weldment and it specially concentrated along the fusion line. Hardness value of Al-Si segregation area is less than 350Hv and tensile strength showed just 78~83% compared with substrate. Accordingly, we proved that both side Al-Si coating should be removed in order to ensure the strength of the substrate.
Measurement of Weld Mechanical Properties of SUS316L Plate Using an Instrumented Indentation Technique
Song, Kee-Nam ; Hong, Sung-Deok ; Ro, Dong-Seong ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 37~42
DOI : 10.5781/KWJS.2013.31.2.37
Different microstructures in the weld zone of a metal structure such as a fusion zone or heat affected zone are formed as compared to the parent material. Thus, the mechanical properties in the weld zone are different from those in the parent material. As the basic data for reliably understanding the structural characteristics of welded PCHE prototype made of SUS316L, the mechanical properties in the weld zone and parent material for a SUS316L plate are measured using an the instrumented indentation technique in this study.
Fatigue Life Evaluation on Compressive & Tensional Residual Stress Induced Materials and Residual Stress Measurement using Hole Drilling Method
Baek, Seung Yeb ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 43~48
DOI : 10.5781/KWJS.2013.31.2.43
This paper Investigated the characteristics of residual stress in weld is composed of typical specimens, are investigated by using three dimensional thermal elasto-plastic FEM analysis. Numerically calculated residual stresses in the gas welds were then compared with experimental results obtained by the hole-drilling method. Using the stress amplitude (
)R at the hot spot point of gas weld, the relations obtained as the fatigue test results for typical specimens having various dimensions and shapes were systematically rearranged to obtain the (
)R-Nf relationship. It was found that more systematic and accurate evaluation of the fatigue strength of plug- and ring-type gas-welded joints can be achieved by using (
The Sensitization and Intergranular Corrosion Behavior of AISI 316L Clad Steel with Butt Welding
Lee, Chul-Ku ; Park, Jae-Won ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 49~56
DOI : 10.5781/KWJS.2013.31.2.49
We have investigated traits of clad metals in hot-rolled clad steel plates, sensitization and mechanical properties of STS 316 steel plate and carbon steel(A516). Clad steel plates were butt-weld by SAW+SMAW, and with the time of heat treatment as the variable, heat treatment was conducted at
, for 80, 160, 320, 640, 1280 minutes. As a way to evaluate it, sectioned weldments and external surfaces were investigated to reveal the degree of sensitization by mechanical property, etching and those of EPR test, results were compared with it. In short, the purpose of this study is suggesting some considerations in developing on-site techniques to evaluate the sensitization of stainless steels.
A Study on the Weldability of Magnesium Alloy by Laser Heat Source (III) - Butt Weldability of Sand Casting Magnesium Alloy using Pulsed Nd:YAG Laser -
Kim, Jong-Do ; Lee, Jung-Han ; Lee, Mun-Yong ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 57~62
DOI : 10.5781/KWJS.2013.31.2.57
Magnesium has good castability and limited workability, so its products have been manufactured by almost casting processes. In this study, a pulsed Nd:YAG laser was used to butt-weld the sand casting magnesium alloys. And the effect of welding conditions such as peak power, pulse width, welding speed was evaluated in detail. As a result of this study, large underfill and plenty of spatter taken place under the conditions with high peak power. Thus, it is recommended to use low peak power and long pulse width to obtain good welds with deep penetration. It is also confirmed that the welding speed and pps(pulse per second) are directly connected at weld defects such as underfill, porosity.
The Weldability of the Dissimilar Magnesium Alloy Welded by Fiber Laser
Kim, Jong-Do ; Kim, Young-Sik ; Song, Mook-Keun ; Lee, Jung-Han ;
Journal of Welding and Joining, volume 31, issue 2, 2013, Pages 63~68
DOI : 10.5781/KWJS.2013.31.2.63
Magnesium alloys have gained increased attention in recent years as the structural materials, because of their attractive properties such as good specific strength, excellent sound damping capability. However, to expand their applications, a reliable joining process is absolutely necessary. In this study, a CW fiber laser was used to investigate the lap weldability of sand casting and wrought magnesium alloys. The effect of defocused distance on lap weldability was examined, and it was found that spatters always generated at the around focused distance because of the high power density of the laser beam. Thus, defocused distance was required to obtain sound welds. In addition, the application of fillet welding was evaluated for minimizing the affect of sand casting magnesium alloy that have relatively poor weldability. As a result of this study, we could confirm good weldability without weld defects.