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JWJ > Volume 32(2); 2014 > Article
Journal of Welding and Joining 2014 April;32(2) :155-162.
Published online May 14, 2014.
doi:https://doi.org/10.5781/JWJ.2014.32.2.29
Ferrite Behavior of Butt Weld Zone in Clad Steel Plates Depended on Holding Time of PWHT
Jae-Won Park*, Chul-ku Lee**
*School of Nano IT Fusion Program, Graduate School of NID Fusion Technology, Seoul National University of Science and Technology, Seoul 139-743, Korea
**Dept. of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, Seoul 139-743, Korea
Correspondence: Chul-ku Lee  Email: weldingtig@hanmail.net
  Published online May 14, 2014
ABSTRACT
Recently, in order to enhance the function and usefulness of products, cladding of dissimilar materials that maximizes the performance of the material is being widely used in all areas of industry as an important process. Clad steel plate, produced by cladding stainless steel plate, an anticorrosive material, on carbon steel plate, is being used to produce pressure vessels. Stainless steel plate has good corrosion resistance, and carbon steel plate has good rigidity and strength; clad steel can satisfy all of these qualities at once. This study aims to find the δ-ferrite behavior, mechanical properties, structure change, integrity and reliability of clad steel weld on hot rolled steel plates. For this purpose, multi-layer welding, repair welding and post weld heat treatment were implemented according to welding procedure specifications (WPS). In order to observe the mechanical properties and toughness of clad steel weld zone, post weld heat treatment was carried out according to ASME Sec. VIII Div.1 UW-40 procedure for post weld heat treatment. With heat treatment at 625 ℃, the hold time was used as the process variable, increased by intervals that were doubled each time, from 80 to 1,280 min. The structure of weld part was typical cast structure; localized primary austenite areas appeared near central vermicular ferrite and fusion line. The heat affected zone showed rough austenite structure created by the weld heat input. Due to annealing effects of heat treatment, the mechanical properties (tensile strength, hardness, impact value) of the heat affected area tended to decrease. From the results of this study, it is possible to conclude the integrity of clad steel welds is not affected much in field welding, repair welding, multi-layer welding, post weld heat treatment, etc.
Keywords: Pressure vessel | Hot rolling clad steel | Post weld heat treatment | δ-Ferrite
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