• Proceedings of the KWS Conference
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• 1996.05a
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• pp.21-25
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• 1996

• Proceedings of the KWS Conference
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• 2001.10a
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• pp.173-176
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• 2001

• Journal of Welding and Joining
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• v.26 no.5
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• pp.16-21
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• 2008

• Journal of the Korean Institute of Gas
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• v.6 no.1 s.17
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• pp.17-23
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• 2002

This paper introduces the spring-mounted odometer system which maintains the correct contact with the pipe wall and measures the distance along the pipe. The odometer wheel is designed to keep contact to the pipelines inner wall and to generate fifty rectangular pulses per one turn(159.5681mm) during pigging. The pipeline has the defects in various types such as buckles, winkles, cracks, dents, welding point and so on. Specially girth welding points which exist each 12m of the pipeline, much affects the operational environment of the odometer. The measurement error of the distance along the pipe is accumulated, for the measurement error of wheel's circumference and the pipeline inner environment. So, this paper proposes the method for the error compensation based on the analysis of the odometer's behavior around the girth welding point of pipe. The experimental results show that developed odometer system can be used for the intelligent pig with good performances.

• Proceedings of the KWS Conference
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• 1996.05a
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• pp.163-166
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• 1996

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.227-228
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• 2013

• Proceedings of the Korean Geotechical Society Conference
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• 1999.10a
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• pp.381-388
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• 1999

The existing methods for installation of long steel pipe pile have some uneconomical problems such as increase of installation cost and period due to the welding of two piles and removal of soil plug, and decrease of driving efficiency due to the increase of driving resistance by time effect during the welding of piles and removal of soil plug, etc. Thus, in this study, new installation method for long steel pipe pile is suggested to work out the existing problems, and calibration chamber tests are peformed to investigate both driving and economical efficiency for the suggested method. The test results showed that the new installation method has increase bearing capacity as well as reduce installation cost and period for long steel pipe piles as compared with existing methods.

• Transactions of Materials Processing
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• v.25 no.3
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• pp.176-181
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• 2016

The exhaust tail pipe is the only visible part of the exhaust system on a vehicle. The conventional way to make the tail pipe is welding after stamping. There are various problems that occur during the stamping of stainless steel sheets such as scratching and local fracture. Problems during welding can also occur due to poor weldability. Tube hydroforming can be a solution, which eliminates these problems. The current study deals with the development of tube hydroforming for a vehicle tail pipe using finite element analysis for a free-feeding method. The current study focuses on the development of a proper load path for the tail pipe hydroforming and how bending influences the subsequent processing steps. The FE analysis results were compared with experimental results. This study shows the importance of bending and the necessity of considering bending when performing a tube hydroforming analysis.

• Korean Journal of Construction Engineering and Management
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• v.5 no.2 s.18
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• pp.81-89
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• 2004

Pipe joining is one of the most critical aspects of most industrial projects, but it is regarded as one of the most inefficient processes in the construction industry. The primary objective of this paper is to explore the applicability of advanced joining technology to the use of metal pipe in the construction industry. This paper begins with a review of current practices with respect to metal joining in the construction industry. The current status of pipe joining is examined. Needs for, and benefits of, advanced joining technology are identified, and a tool for evaluating the applicability of various methods to construction is presented. Joining technologies, including mechanical joining, adhesive bonding, welding, and welding automation, are then introduced, and their applicability to the construction industry is assessed by means of this evaluation tool. It is concluded that there is significant benefits for improvement of piping process in the construction industry through the use of advanced joining technologies.

• Journal of Welding and Joining
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• v.21 no.6
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• pp.64-70
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• 2003

Multipass welds of the 316L stainless steel have been widely employed in the pipes of Liquid Metal Reactor. Owing to localized heating and subsequent rapid cooling by the welding process, the residual stress arises in the weld of the pipe. In this study, the residual stresses in the 316L stainless steel pipe welds were calculated by the finite element method using ANSYS code. Also, the residual stresses both on the surface and in the interior of the thickness were measured by HRPD(High Resolution Powder Diffractometer) instrumented in HANARO Reactor. The experimental data and the calculated results were compared and the characteristics of the distribution of the residual stress discussed.