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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 11, Issue 4 - Dec 1993
Volume 11, Issue 3 - Sep 1993
Volume 11, Issue 2 - Jun 1993
Volume 11, Issue 1 - Mar 1993
Selecting the target year
Trend of Welding Technologies for Improving Welding Productivity
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 1~9
Brazing 기술의 기초와 실제( IV) -Brazing의 방법 및 장치-
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 10~23
Review on Welding Technology and Welded Joint Strength of GT Membrane Type LNG Carrier
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 24~35
Welding Deformation of The PLS Storage Ring Chamber
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 36~43
A Study on Selection of Gas Metal Arc Welding Parameters of Fillet Joints Using Neural Network
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 44~56
The arc welding processes are substantially nonlinear, in addition to being highly coupled multivariable systems, Frequently, not all the variables affecting the welding quality are known, nor may they be easily quantified. From this point of view, decoupling between the welding parameters from the welding quality is very difficult, which makes it also difficult to control the welding parameters for obtaining the desired welding quality. In this study, a neural network based on the backpropagation algorithm was implemented and adopted for the selection of gas metal arc welding parameters of the fillet joint, that is, welding current, arc voltage and welding speed. The performance of the neural network for modeling the relationship between the welding quality and welding parameters was presented and evaluated by using the actual welding data. To obtain the optimal neural network structure, various types of the neural network structures were tested with the experimental data. It was revealed that the neural network can be effectively adopted to select the appropriate gas metal arc welding parameter of fillet joints for a given weld quality.
A Study on the Effect of Heat Input on the Microstructure and Toughness of Weldments Made by Domestic Flux Cored Wires.
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 57~69
In the present study, the microstructure and Charpy V notch toughness of multipass
FCA weldment in three different heat inputs(1-3KJ/mm)were investigated. The weldments using two different domestic FCAW wires(AWS E71T-1 and E71T-5 equivalent) in C-Mn steel were chemically analysed. The following conclusions can be inferred. 1. T-1 wire Showed a stable arc transfer, less spatter and harsh, a better bead spreading and easy slag removal, whereas T-5 wire suffered from the arc stability, which tended to increase spatter and produce a more convex bead. 2.The microsturctures of the top beads of the weldments in three different heat inputs consisted of coarse-grained boundary ferrite and Widmanstatten ferrite side plate with increasing heat inputs. The modest fraction of acicular ferrite in the two wire weldments was observed in the 2KJ/mm heat input. 3.The fine-grained reheated zones of both welds consisted of a duplex microstructure of polygonal ferrite and second phases. 4. The basic flux weldment of T-5wires showed a higher Charpy impact property than that of T-1 wires because of a higher fraction of acicular ferrite in the weld microstructure.
A Study on the Zircaloy-4 Brazing with Beryllium Filler Metal for the Nuclear Fuel
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 70~78
An attempt was made to investigate the effect of brazing time on microstructure, microhardness, and corrosion of Zircaloy -4as well as the beryllium diffusion into its sheet. The sheets were coated with beryllium and brazed at
for 20-40 minutes in
torr vacuum atmosphere. 1. Microstructurally the brazed zone was largely divided into three regions: a region of continuous or partially formed of eutectic liquid films along grain boundaries; a region of precipitation in both grains and grain boundaries; a region of elongated wide structure of .alpha.-laths, which was not affected by beryllium. 2. Due to the precipitates, the beryllium-migrated region was hardened and the width of the hardened region increased with increasing brazing time. 3. Beryllium brazed Zircaloy -4 sheets showed a higher corrosion rate than those of as-received and heat-treated at a brazing temperature. 4. Diffusion coefficient of beryllium into Zircaloy -4 at
for 30 minutes was
It seemed that Be penetrated Zircaloy -4 by forming eutectic liquid films along grain boundaries in the proximity of Be/Zr interface and it, thereafter, diffused into Zircaloy mainly by interstitial solid solution.
Microstructural Changes on Weld Heat Input in
Quenched and Tempered High Strength Steel
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 79~90
Shielded metal arc welding, one-ploe and two-pole submerged arc welding were accomplished to investigate microstructure changes on phase transformation behavior in
quenched and tempered high strength steel. Microstructures were examined by optical micrograph and TEM. In shielded metal arc welding (oxygen 250ppm), the inclusions were small size (0.3-0.5
)and small in number. In submerged arc welding (oxygen 430-529ppm), the inclusions were larger(0.7-2
) than that of shielded metal arc welding and large in number. Microstructure mainly depends on number and distribution of inclusions in fusion zone of weld metal. It was noticed that a limited number of inclusions favors the formation of acicular ferrite.
A Study on Wear Properties of Plasma Sprayed
-NiCr Coating at High Temperature
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 91~102
The plasma sprayed
-NiCr coatings are widely used as wear-resistant and corrosion-resistant materials. The mechanical and wear properties of the plasma sprayed
-NiCr coating on steel plate were examined in this study. The pore in the coatings could be classified into two types, the one is the intrinsic pore originated from the spraying powder, the other is the extrinsic pore formed during spraying. During the tensile adhesion test, the fracture occured at the interface of top coating and bond coating. It is though that the compressive residual stress increases with the increase of the top coating thickness. From the wear test, it was found that the wear rate increased with the increase of the sliding velocity regardless of the temperature. It is thought that the fracture toughness reduces with the increase of the sliding velocity at
and that the adhesion amount increases with the increase of the sliding velocity at
It is concluded that the wear mechanism at
is the fracture and pull-out of the carbide particles due to the fatigue on sliding surface, while the wear mechanism at
is the adhesion of the smeared layer formed during wear process.
A Study on the Mechanical Behavior of Welded Parts in Thick Plate during Post Welding Heat Treatment
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 103~111
Recently, several high-tensile steels(e.g. 80kg and above,
-1Mo)having good quality to high temperature and pressure-resistance are widely used to construct petroleum-plant and pressure vessel of heat or nuclear-power plant. However, in the steels, reheating crack at grain boundaries of the heat affected zone(HAZ) occures during post welding heat treatment(PWHT)to remove welding residual stress. In order to study theoretically the characteristics of reheating crack created by PWHT, the computer program of three-dimensional thermal-elasto-plasto-creep analysis based on finite element method are developed, and then the mechanical behavior(history of creep strain accumulation and stress relaxation, etc)of welded join in thick plate during PWTH is clarified by the numerical results.
A Study on Fatigue Crack Propagation Analysis and Fatigue Strength Evaluation for Bulk Carrier
Journal of Welding and Joining, volume 11, issue 4, 1993, Pages 112~124
It has been reported that fatigue damage sometimes occurred at the stress concentrated and dynamic loaded structural members of bulk carrier. In this paper, studies on fatigue strength of hull structures are reviewed, and the program for evaluating fatigue strength is developed. And the fatigue crack initiation and propagation on the end part of cargo hold frame of bulk carrier were calculated by FEM stress analysis and the fatigue strength evaluation program. These method can be applied not only to the crack initiation life but also to crack propagation life for the hull structural members at the hull design stage and be effective as the guideline to prevent the crack initiation or to estimate the fatigue strength for repairing of the fatigue damaged structures of real ships.