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Journal of KWJS 2008;26(1):50-55.
Published online March 21, 2008.
저 합금강재(2.25Cr-1.0Mo) 반복 보수용접 열영향부의 특성
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A Characteristics of the Multiple Repair Welding HAZs in a Low Alloy-Steel(2.25Cr-1.0Mo)
Chul-Ku Lee, Jong-Seok Ahn, Nam-Hyuck Lee, Gil-Jae Lee
Abstract
  A low alloy-steel(2.25Cr-1.0Mo) has been widely used for boiler piping, header and tubes in high temperature and pressure conditions of the thermal power plant. It is common knowledge that the repair welding is permitted two or three times by customary practice rule, but there is no regulation to limit the number of repair welding base on the study heat-affected zone(HAZ), which is the weakest zone when repair welding is under taken, by experiments about the metallographic degradation and mechanical properties. Therefore, this study aims to verify the reliability of 5 times repair welding through conducting the experimental observation in the mechanical and the metallographic change on HAZ varying repair welding times. In results of the experiments, it is concluded that the reliability was kept in HAZ even up to the fifth repairs.
Key Words: Thermal power plant, Low alloy-steel, Heat-affected zone, Metallographic degradation


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