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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 23, Issue 6 - Dec 2005
Volume 23, Issue 5 - Oct 2005
Volume 23, Issue 4 - Aug 2005
Volume 23, Issue 3 - Jun 2005
Volume 23, Issue 2 - Apr 2005
Volume 23, Issue 1 - Feb 2005
Selecting the target year
Welding and Joining Research Institute in World
Gang, Jeong-Yun ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 1~3
Analysis of Welding Phenomena and Effect of Short Circuit Current Rise Slope in the High Speed
Welding of Steel Sheets
Kim, Young-Sam ; Ryoo, Hoi-Soo ; Kim, Hee-Jin ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 14~19
In high speed
welding, it has been blown to produce no sound bead with undercut or humping bead. In this study welding phenomena through synchronized high speed camera and output welding voltage and current waveform has been analyzed. For the purpose to improve a welding bead, effect of short circuit current rise slope has been examined. With commercial power source it was produced no sound bead by instantaneous short circuit, long arc period and stubbing at welding speed 2.5mm/min Humping bead or undercut were showed by instantaneous short circuit and long arc period. Also, the weld bead was not formed during the long short circuit period after stubbing start and long arc extinguishment period after wire sticking by failure of arc regeneration, because the droplet was not transferred to weld pool. With increasing short circuit current rise slope the frequency of stubbing was decreased and the normal short circuit rate was increased. A control of short circuit current rise slope was effective factor in high speed welding.
Fatigue Strength Evaluation of Welded Box Type with HR Coil
Kang, Sung-Won ; Kim, Myung-Hyun ; Jang, Yong-Won ; Lee, Jin-Woo ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 20~24
Due to the difficulties associated with the supply of steel plates, hot rolled coil (Steel grade: SM490A) is considered fur structural materials in replace of the existing SWS50A-M1. However, it is found that SM490A exhibits a significant anisotropy in terms of impact energy with respect to transverse and longitudinal directions. In this study, an experimental investigation is carried out to examine the relationship between the anisotropy in impact values and the fatigue strengths of SM490A with respect to the rolling direction of test specimens. All test specimens failed around 1,500,000 cycles regardless of the test specimen direction. Therefore, it is found that the anisotropy in impact energy is not related to the fatigue strength of the materials considered in this study. However, the transverse direction specimen showed more rapid brittle fracture mode compared to that of longitudinal direction specimen, and this appears to be related to the lower impact values in transverse direction.
A Study on Laser Joining of Low Carbon Steel and Aluminum Alloy Part 1 : Process Parameters
Park, Tae-Wan ; Cho, Jung-Ho ; Na, Suck-Joo ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 25~29
Steel has been mainly used in the automotive industry, because of good mechanical properties, weldability and so on. However, there has been increase in using aluminum to reduce the weight of vehicle. This leads to improve fuel efficiency and to reduce air pollution. A steel-aluminum hybrid body structure is recently used not only to reduce the weight of vehicle but also to increase safety. In this paper, the laser beam joining method is suggested to join steel and aluminum. To avoid making brittle intermetallic compounds(IMC) that reduce mechanical properties of the joint area, only aluminum is melted by laser irradiation and wetted on the steel surface. The brittle IMC layer is formed with small thickness at the interface between steel and aluminum. By controlling the process parameters, brittle IMC layer thickness is suppressed under 10 micrometers which is a criterion to maintain good mechanical properties.
A Study on Laser Joining of Low Carbon Steel and Aluminum Alloy Part 2 : Process Analysis
Park, Tae-Wan ; Cho, Jung-Ho ; Na, Suck-Joo ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 30~36
In this part, thermal finite element analysis(FEA) is conducted for the experiments in part 1. The molten area of base metals are analyzed by FEA results and compared with experimental ones. Temperature data from FEA results are used to calculate the IMC layer thickness analytically at the interface. IMC layer is established as a function of time and temperature when there is an interaction between solid steel and molten aluminum. The IMC layer thickness is obtained by cumulative computations using the time-temperature data from FEA results.
Non-contact Ultrasonic Inspection Technology of Fillet Weldments
Park, Ik-Keun ; Lee, Chul-Ku ; Kim, Hyun-Mook ; Park, Tae-Sung ; Kim, Yong-Kwon ; Cho, Yong-Sang ; Song, Won-Joon ; Ahn, Houng-Kun ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 37~42
The non-destructive Inspection of the fillet weldment has difficulties due to its geometrical complexity and uneasy access. The surface shear horizontal wave (SH-wave), however, has been successfully applied to the detection of cracks on the surface and sub-surface of the filet weldment heel part. The conventional ultrasonic inspection using the surface SH-wave is usually a contact method using piezoelectric transducer. Thus, it is not suitable for a field application because the reliability and repeatability of inspection are significantly affected by test conditions such as couplant, contact pressure and pre-process. In order to overcome this problem, a non-contact SH-wave inspection method using EMAT is propose. The experimental results with this non-contact method are compared with those with a conventional ultrasonic method in fillet weldment with slit type defects. It is shown that the non-contact inspection technique requires simple procedure and less time in the fillet weldment inspection.
Long Range Ultrasonic Guided Wave Techniques for Inspection of Pipes
Park, Ik-Keun ; Kim, Yong-Kwon ; Kim, Hyun-Mook ; Song, Won-Joon ; Cho, Yong-Sang ; Ahn, Yeon-Shik ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 43~48
Conventional non-destructive techniques for inspection of the weld in pipelines require significant test time and high cost. Ultrasonic guided waves have been widely studied and successfully applied to various non-destructive tests with advantage of the long-range inspection. In this paper, a study on the application of ultrasonic guided waves to the long-range inspection of the pipeline is presented using a long-range guided wave inspection system, Wavemaker SE16, GUL. The characteristics and setup of the long-range guided wave inspection system and experimental results in pipes of with various diameter are introduced. The experimental results in mock-up pipes with cluster type detects show that the minimum detectable wall thickness reduction with this guided wave system is
in the pipe cross section area. And the wall thickness reduction of
in cross section area can be detected when actual detection level is used. Therefore, the applicability of the guided wave systeme to long-range inspection of wall thickness reduction in pipes is verified.
Effective Charge Number and Critical Current Density in Eutetic SnPb and Pb Free Flip Chip Solder Bumps
Chae, Kwang Pyo ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 49~54
The effective charge number and the critical current density of electromigration in eutetic SnPb and Pb Free
flip chip solder bumps are studied. The effective charge number of electromigration in eutectic SnPb solder is obtained as 34 and the critical current density is
is the electromigration-induced compressive stress gradient along the length of the line. While the effect of electromigration in Pb free solder is much smaller than that in eutectic SnPb, the product of diffusivity and effective charge number
has been assumed as
. The critical length for electromigration are also discussed.
Analysis of Transmission Infrared Laser Bonding for Polymer Micro Devices
Kim, Joo-Han ; Shin, Ki-Hoon ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 55~60
A precise bonding technique, transmission laser bonding using energy transfer, for polymer micro devices is presented. The irradiated IR laser beam passes through the transparent part and absorbed on the opaque part. The absorbed energy is converted into heat and bonding takes place. In order to optimize the bonding quality, the temperature profile on the interface must be obtained. Using optical measurements of the both plates, the absorbed energy can be calculated. At the wavelength of 1100nm
of incident laser energy was used for bonding process from the calculation. A heat transfer model was applied for obtaining the transient temperature profile. It was found that with the power of 29.5 mW, the interface begins to melt and bond each other in 3 sec and it is in a good agreement with experiment results. The transmission IR laser bonding has a potential in the local precise bonding in MEMS or Lab-on-a-chip applications.
Joint properties and Interface Analysis of Friction Stir Welded Dissimilar Materials between Austenite Stainless Steel and 6013 Al Alloy
Lee, Won-Bae ; Biallas, gehard ; Schmuecker, Martin ; Jung, Seung-Boo ;
Journal of Welding and Joining, volume 23, issue 5, 2005, Pages 61~68
Dissimilar joining of Al 6013-T4 alloys and austenite stainless steel was carried out using friction stir welding technique. Microstructures near the weld zone and mechanical properties of the joint have been investigated. Microstructures in the stainless steel side were composed of the heat affected zone and the plastically deformed zone, while those in the Al alloy side were composed of the recrystallized zone including stainless steel particles, the thermo-mechanically affected zone and the heat affected zone. TEM micrographs revealed that the interface region was composed of the mixed layers of elongated stainless steel and ultra-fine grained Al alloy with lamella structure and intermetallic compound layer. Thickness of the intermetallic layer was approximately 300nm and was identified as the A14Fe with hexagonal close packed structure. Mechanical properties, such as tensile and fatigue strengths were lower than those of 6013 Al alloy base metal, because tool inserting location was deviated to Al alloy from the butt line, which resulted in the lack of the stirring.