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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 28, Issue 6 - Dec 2010
Volume 28, Issue 5 - Oct 2010
Volume 28, Issue 4 - Aug 2010
Volume 28, Issue 3 - Jun 2010
Volume 28, Issue 2 - Apr 2010
Volume 28, Issue 1 - Feb 2010
Selecting the target year
Outline of Explosion Bulge Test in Air of Welding Structure
Park, Tae-Won ; Song, Young-Beum ; Kim, Hong-Kyu ; Hong, Sung-Suk ; Shim, In-Ok ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 6~9
DOI : 10.5781/KWJS.2010.28.1.006
Development of Alloy Design and Welding Technology for Austenitic Stainless Steel
Kang, Nam-Hyun ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 10~14
DOI : 10.5781/KWJS.2010.28.1.010
Weld Properties of Ferritic Stainless Steels for Automotive Exhaust Manifolds
Hong, Seung-Gab ; Uhm, Sang-Ho ; Lee, Won-Bae ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 15~21
DOI : 10.5781/KWJS.2010.28.1.015
Development Trends of Duplex Stainless Steels for the Process Industries and It's Weldability
Ahn, Sang-Kon ; Kim, Ji-Soo ; Kim, Kwang-Tae ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 22~33
DOI : 10.5781/KWJS.2010.28.1.022
Joining Ability and Mechanical Properties of Friction Stir Lap Welded A5052-H112 Alloy
Ko, Young-Bong ; Choi, Jun-Woong ; Park, Kyeung-Chae ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 34~40
DOI : 10.5781/KWJS.2010.28.1.034
In Friction Stir Lap Welding(FSLW), the movement of material within the weld was more important than the microstructure, due to the interface present between the sheets. Thus, The soundness of free defect, Effective Sheet Thickness(EST) and width of joint were most important factor of mechanical properties. Specimens by lap joint types that were 'A-type' and 'R-type' were made in this study. A-type tensile specimen was loaded at advancing side and R-type tensile specimen was loaded at retreating side. Macro-, micro-structural observation and mechanical properties of FSLW A5052-H112 alloy ware investigated under varying rotating and welding speed. The results were as follows: Material hook formed decreasing after sharply increasing was appeared at the end interface of joint area in advanced side, and material hook formed decreasing after smoothly increasing was observed at that in retreated side. Tensile load had no relation with defects. As rotating speed was higher, tensile strength was increasing and EST was decreasing regardless of joint types. joint efficiency was over 70%. In a result of fractography, fracture in A-type was partially occurred by dimple in SZ, and fracture in R-type was generally occurred by dimple in HAZ.
Study on the Improvement of Weld-joint Reliability in Waterwall Tubes of the Ultra Supercritical Coal Fired Boiler
Ahn, Jong-Seok ; Lee, Seung-Hyun ; Cho, Sang-Kie ; Lee, Gil-Jae ; Lee, Chang-Hee ; Moon, Seung-Jae ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 41~46
DOI : 10.5781/KWJS.2010.28.1.041
The low alloy-steel material(1.0Cr-0.5Mo, SA213T12), which has widely been used for the waterwall tube in the conventional power plant, do not have enough creep rupture strength for waterwall tubes of the Ultra-supercritical(USC) boilers. According to this reason, the high-strength low alloy-steel(2.25Cr-1.0Mo, SA213T22) has newly been adopted for the waterwall tube in the USC boilers. This paper presents failure analysis on weld-joint of the waterwall tubes in USC boilers. Visual inspections were performed to find out the characteristics of the fracture. Additionally both microscopic characteristics and hardness test were carried out on failed tube samples. Failures seem to happen mainly because the welding process has not been conducted strictly.(preheating, P.W.H.T and so forth). Thus, this paper has the purpose to describe the main cause of the poor welding process and to explain how to prevent similar failures in those weld-joints.
Brittle Crack Arrestability of Thick Steel Plates for Shipbuilding
An, Gyu-Baek ; Ryu, Kang-Mook ; Park, Joon-Sik ; Jeong, Bo-Young ; Kim, Tae-Su ; Lee, Jong-Sub ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 47~53
DOI : 10.5781/KWJS.2010.28.1.047
In recent time there is vigorous requirement for the use of thick steel plate in various industrial fields including shipbuilding industry. Especially, with the continual increases in marine transportation volumes on a global scale, the steel of container ships has become thicker and thicker with the increased size of ships. In addition, the brittle crack arrestability of heavy thick plates was big issue, in recently. In this study, crack arrest test were conducted in order to investigate the crack arrestability of thick plates for shipbuilding steels, where test plate thicknesses were 50mm and 80mm. This paper introduces the brittle crack arrestability of heavy thick plates with thickness effect for shipbuilding.
Development of Distortion Analysis Method for Multi-pass Butt-welding Based on Shell Element
Ha, Yun-Sok ; Yang, Jin-Hyuk ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 54~59
DOI : 10.5781/KWJS.2010.28.1.054
Ship Blocks are assembled by welding, and among them, welding between large blocks (Pre-erection stage) is used as feature of butt. In this process, local material has a experience of thermal cycle and become finally shrunk. As for inconsistency of shrunk weldments and adjacent regions, ship structure would be deformed locally and globally. Thermal distortion analyses are done for control of these processes, and methodologies capable of ship block size among them are using 2-D shell element in FEM. A shell element takes charge of plate, so it has its thickness which is important for angular distortion by welding. By the way, a butt-welding consists normally of several passes, and weldment thickness are different at each pass. If a calculated final one-time welding shrinkage is acting on the shell element whose thickness is same as it of plate, then deformation value must be underestimated. This research developed a methodology that total deformation after multi-pass welding can be analyzed by one time at shell element having original thickness of its plate. We use the SDB thermal distortion analysis method and verified by several experiment. The both experimental and analysis results showed good agreements.
Effects of Al, Mn and Si Contents on Spatter, Fume, Microstructure and Mechanical Property with 490MPa Grade Flux Core Wire
Kim, Min-Chul ; Jung, Won-Jung ; Lee, Bong-Keun ; Kong, Jong-Pan ; Kang, Chung-Yun ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 60~65
DOI : 10.5781/KWJS.2010.28.1.060
This paper is concerned with effects of Al, Mn and Si contents on spatter, fume, microstructure and mechanical property with 490MPa Grade Flux Core Wire(FCW). Ten kinds of FCW were fabricated by varying Mn, Si and Al contents and each FCW was weld for check the amount of spatter and fume generations, microstructures and mechanical property. Amount of spatter and fume generations was decreased with the increasing Si contents and decreasing by Al contents in FCW. And, their microstructure of weld metal were changed by Mn, Al and Si contents in FCW. With increasing of Al and Si, acicular ferrite was fine and volume fraction of acicula ferrite was increased. Thereby leading to improvement of Charpy impact property and strength.
A Study of Weldability for Pure Titanium by Nd:YAG Laser(IV) - Lap Welding and Application for Heat Exchanger -
Kim, Jong-Do ; Kwak, Myung-Sub ; Lee, Chang-Je ; Kil, Byung-Lea ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 66~71
DOI : 10.5781/KWJS.2010.28.1.066
With large specific strength and outstanding corrosion resistance and erosion resistance in sea water, titanium and titanium alloy are widely used in heat exchanger production. In particular, pure titanium demonstrates outstanding molding performance and may be considered optimal for production of heat exchanger. Since titanium is very vulnerable to oxidation and embrittlement during welding, processes with less heat input are widely used, and laser welding is widely applied by considering production performance and shield etc in atmosphere. So far, 1st report and 2nd report compared and analyzed embrittlement degrees by bead colors of weldment through oxygen and nitrogen quantitative analysis and hardness measurement, and evaluated welding performance and mechanical properties of butt welding. This study evaluated field applicability of lap welding to heat exchange plate of LPG re-liquefaction device for ships through tensile stress test, hardness test and internal pressure test etc after deducing optimal weding condition and applying to actual heat exchange plate. In bead overlap area, the experiment produced sound welds with no porosity or defect by increasing and decreasing laser power, and tensile-shear test results indicated virtually the same tension and yield strength as base metal. As a result of measuring hardness at lateral cross section and bead overlap zone of actual heat exchanger welds, hardness difference within 20Hv was produced at base metal, HAZ and weldment, and as a result of pneumatic and hydraulic pressure test, no leakage occurred.
Weld Quality Quantification through Chaotic Analysis
Cho, Jung-Ho ; Farson, Dave ; Kim, Cheol-Hee ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 72~76
DOI : 10.5781/KWJS.2010.28.1.072
Irregular fluctuation of penetration depth in CW single mode fiber laser welding is analyzed statistically and chaotically. Among various chaos theories, one of the basic concept referred as Lyapunov exponent is applied to the analysis to quantify the irregularity of penetration. Especially, maximal Lyapunov exponent (MLE) is known as the representative value indicating chaotic degree of the system dynamics. MLE calculation method of experimental data is applied to longitudinal spiking defect in fiber laser weld. Laser power modulation is suggested as a remedy then the computed MLE value is compared to CW case. It is shown that the adoption of chaos theory, MLE computation, can be used as a measurement standard to prove the validity of the solutions to prevent the unexpected chaotic behavior of weld through this work.
Reliability Assessment and Accelerated Life Prediction of Gas Welded Joint in the Rail Road Car Body (1. Plug and Ring Type)
Baek, Seung-Yeb ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 77~85
DOI : 10.5781/KWJS.2010.28.1.077
Stainless steel sheets are widely used as the structure material for the railroad cars and the commercial vehicles. These kinds structures used stainless steel sheets are commonly fabricated by using the gas welding. Gas welding is very important and useful technology in fabrication of a railroad car and vehicles structure.However fatigue strength of the gas welded joints is considerably lower than parent metal due to stress concentration at the weld, fatigue strength evaluation of gas welded joints are very important to evaluate the reliability and durability of railroad cars and to establish a criterion of long life fatigue design. In this paper,
curve were obtained by fatigue tests. Using these results, the accelerated life test(ALT) was conducted. From the experimental results, an acceleration model was derived and acceleration factors are estimated. So it is intended to obtain the useful information for the fatigue lifetime of plug and ring gas welded joints and data analysis by statistic reliability method, to save time and cost, and to develop optimum accelerated life prediction plans.
Analysis of Welding Residual Stress Redistributions on Notched Multi-pass FCA Butt Weldment
Bang, Hee-Seon ; Bang, Han-Sur ; Oh, Ik-Hyun ; Kim, Jun-Hyung ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 86~91
DOI : 10.5781/KWJS.2010.28.1.086
In the present study, two-dimensional plane deformation thermo elasto-plastic analysis has been carried out, in order to investigate the thermal and mechanical behaviour (residual stress, plastic strain, magnitude of stress and their distribution and production mechanism) on multi-pass FCA butt weldment of high strength EH36-TMCP ultra thick plate. Moreover, this study can be considered as a basis for analysing the fracture toughness, KIC, and its effect on welding residual stress redistribution with notch on multi-pass FCA butt weldment, in future. The results of welding residual stress obtained from thermo elasto-plastic analysis has been compared and verified with the results measured by XRD.
Development of Knowledge-based Method to Automatically Derive the Deformation Estimation Formula due to Line Heating
Lee, Joo-Sung ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 92~99
DOI : 10.5781/KWJS.2010.28.1.092
For the last couple of decades many studies have been carried out to find out solutions to improve the effectiveness and productivity of the plate forming process. The practical way for the automation of the plate forming process has not been, however, developed yet. Since the characteristics of heating machines may be different form each other, it is necessary to investigate the thermal deformation characteristics of the heating machine to be used in the automation system. And their characteristics may be updated as new information about thermal deformation by heating is accumulated. In this paper, data base system has been constructed based on the results of experiments and numerical analyses, which will be used in deriving the deformation estimation formula. The computer code which can automatically derive the deformation estimation formula has been also developed. This paper also illustrates how the formula is updated as experimental data are added. From the present findings, it can be said that the automatic deriving procedure may be important in the automated plate forming system since the heating line information to be generated must be directly influenced by the deformation estimation formula.
Crack Growth Analysis of Dissimilar Metal Weld using a Numerical Method
Kim, Sang-Chul ; Kim, Maan-Won ;
Journal of Welding and Joining, volume 28, issue 1, 2010, Pages 100~106
DOI : 10.5781/KWJS.2010.28.1.100
In this paper crack propagation analyses in the dissimilar metal weldment of a nozzle were performed using a finite element alternating method (FEAM). A two-dimensional axisymmetric finite element nozzle model was prepared and welding simulation including the thermal heat transfer analysis and the thermal stress analysis was performed. Initial cracks were inserted at weld and heat affected zone in the finite element model which has welding residual stress distribution obtained from the welding simulation. To calculate crack propagation trajectories of these cracks, a new fatigue crack evaluation module was developed in addition to the previous FEAM program. With the new FEAM fatigue crack evaluation module, crack propagation trajectory and crack growth time were calculated automatically and effectively.