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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 12, Issue 4 - Dec 1994
Volume 12, Issue 3 - Sep 1994
Volume 12, Issue 2 - Jun 1994
Volume 12, Issue 1 - Mar 1994
Selecting the target year
Trend and Weldability of Steels for Construction
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 1~17
Welding Technologies in the Steel Structure for Building
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 18~25
Review of Fatigue Strength Evaluation on Weld Joints of Hull Structure
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 26~35
Safety Evaluation and Maintenance Methods for Steel Bridges
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 36~40
Weldabilities of 7000 Aluminium Alloys(III)
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 41~47
A Study on the Interfacial Structure and Shear Strength of Cu/Stainless Steel Brazed Joint
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 48~55
In this experiment, to find optimum brazing conditions for Cu/Stainless Steel brazing using filler metals of Ag-Cu-Zn-Cd system, first of all spreading ratio was tested on 304 stainless Steel and low carbon steel. And then shear test of brazed joint was executed. As the result of that, the shear strengths of brazed joints were the range of 60-90 MPa. Through microstructure analysis for brazed interface layer, We found as follows. Firstly interface layer increased as time increased. Secondly continuous layer of Ag-Cd compound was observed along the side of stainless steel. Also by means of EDS analysis for fracture surface, ductile fracture was occurred and precipitates on the fracture surface were found to include Cr, Mn, Si in Ag-rich phase.
A Study on the Spot Weldability of High Strength Steel Sheet and Two Stories Galvannealed High Strength Steel Sheet
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 56~62
The spot weldability of high strength steel sheet and two stories galvannealed high strength steel sheet has been studied. 1) Tensile shear strength decreased inversely as welding current increased over 12KA in the case of two stories galvannealed high strength steel sheet. 2) When heat flux input over 12KA, hardening region become narrow in case of two stories galvannealed high strength steel sheet. 3) The size of hardening region affect the strength of nuggets.
A Study on the Comparison of Material Similarity Using Sugeno Fuzzy Integral in Laser Cutting Process
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 63~70
Laser processing workmen should select the working condition for laser cutting of new materials by the preparatory experiments for that material or from the past experiences in cutting of other similar materials. This paper proposes a criterion to determine how much a material is similar to other materials by using the Sugeno fuzzy integral. With the proposed criterion the laser processing workman can objectify the considered material for his decision. The expert system programmer can give the system a high flexibility by experimenting with some materials in a large range of similarity and can support the laser processing workman by offering the similarity between materials.
A Study on the Development of an Expert System for
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 71~81
Laser cutting is experiencing a rising worldwide acceptance in the industry. Expert systems are necessary for the systematic arrangement and searching of experimental data existing in journal papers, job handbooks, etc.. This paper proposes an expert system for the selection of the appropriate laser cutting variables from the available database. Optimum cutting conditions according to the given cutting velocity were searched and qualitative comments which are difficult to be used as database variables were shown at each velocity using the binary and fuzzy inference. These comments could be informative to unskilled operators of the laser cutting process. Typical cutting conditions of the mild steel and stainless steel were included and the working range and quality variations were displayed graphically. The proposed algorithm was implemented in an IBM compatible personal computer as an expert system for CO
laser cutting to derive the optimum cutting conditions by using the turbo prolog.
A Model Estimating the Ratigue Crack Growth in Aluminum Alloy A5083-O Considering the Effect of Stress ratio
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 82~89
In this paper the effect of stress ratio on the fatigue crack growth rate of aluminum alloy A5083-O was examined. The fatigue tests were carried out using CCT (center cracked tension) specimens and CT(compact tension) specimens which were subjected to 0.5 and -1.0 stress ratio respectively. The obtained results are as follows; 1) The
as the function of stress ratio R was introduced in evaluating the fatigue crack growth rate of A5083-O. 2) A new model evaluating the effect of stress ratio on the fatigue crack growth rate was developed over the region of low and high propagation rate.
A Model Estimating the Fatigue Crack Growth in Aluminum Alloy A5083-O Considering the Effect of Stress Concentration
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 90~100
In this study the fatigue crack growth behavior was investigated for the surface cracks in aluminum alloy A5083-O plate and its weldment. Several kinds of specimens were tested at room temperature. The Eccentric specimens(E1.0, E2.5) subjected to combined stresses(tension+bending) were tested and the welded specimens with weld toes(TOE1, TOE2) were tested in order to verify the method to consider the stress concentration such as weld toe. It was ascertained that the surface crack growth property in the weld toe could be predicted by the corrected Pang's equation proposed in this study.
The preparation of Al-Si alloy welding rod by the horizontal continuous casting process with the heating mold
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 101~108
The horizontal continuous casting process with the heating mold was adopted for fabricating defect-free 4043 Al alloy rods of 3.2m dia. with mirror surfaces. These rods were drawn into 2.4mm dia. rods for GTAW welding. The GTAW welding tests were carried out by use of these welding rods with 6061 Al alloy as a base metal. After welding, the X-ray tests, tensile strength tests, bending tests, and microstructural analysis of welded zone and HAZ were carried out. The results represented that the welding rods with good surfaces and welding properties could be made by the horizontal continuous casting, and followed by the drawing process.
Nondestructive evaluation of spot weld quality using by ultrasonic measurement
Journal of Welding and Joining, volume 12, issue 3, 1994, Pages 109~117
Spot welding has wide used with a high work efficiency in the automotive and aerospace industries. Up to the present, the technique mainly used to test spot welds on production lines has been entirely depended upon destructive chisel or peel testing. Therefore, it's being very important assignment to secure the NDE technique which can be evaluate spot weld quality with more efficiency and high reliability. This paper discusses the feasibility of UNDE techniques to evaluate spot weld quality. For the sake of the approach to the quantitative measurement of nugget diameter and the discrimination of a the corona bond from nugget, ultrasonic c-scan image and distribution of reflective echo amplitude was measured by immersion method with the mechanical and the electronic scanning of point-focussed ultrasonic beam(25 MHz). As the results of this study, corona bond which is the most dangerous types of interface defects can be successfully detected, as well as expulsion and voids. Ultrasonic testing results were confirmed and compared by optical microscope and SAM(Scanning Acoustic Microscope) observation of the spot-weld cross section. The results show that the nugget diameter can be successfully measured with the accuracy of 0.8 mm.