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Vol.60, No.12, 873 ~ 884, 2022
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| Title |
| Evaluation and Prediction of Formation of Heat-Affected Zone and Mechanical Properties According to Welding Method of STS 316L/A516-70N Clad Plates |
| 황철홍 Cheolhong Hwang , 조명우 Myungwoo Joe , 김선환 Sunhwan Kim , 한두희 Doohee Han , 유경훈 Kyunghoon Yoo , 김성웅 Sungwoong Kim , 김영주 Youngjoo Kim , 이상엽 Sangyeob Lee , 박준식 Joonsik Park |
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| Abstract |
| Two welding methods of FCAW (Flux-cored arc welding) + FCAW, and FCAW + GTAW (Gas tungsten arc welding) were compared to identify effective routes for STS 316L/A516-70N clad stainless steel. Since the welding speed of the FCAW + GTAW welding method is slower than that of the FCAW + FCAW welding method, the amount of heat input is large, the size of the heat-affected zone formed is larger, and the amount of angular deformation is also large. The microstructure and deformation of the welding specimens were investigated by computational simulation, and the results were compared with calculated results for actual specimens. The results were very similar, thus confirming the high accuracy of the calculation. After measuring the hardness value of the actual welded specimens, the specimen welded by the FCAW + FCAW welding method was found to have a higher hardness value. The hardness of the welded portion of the FCAW + GTAW specimen tests tended to remain at nearly the same value throughout the specimen, indicating that the FCAW + GTAW hardness profile is desirable. In the computer simulation, butt welding was used to set the optimal heat source conditions for the two welding methods, and the effect of heat formed during welding was confirmed using the thermal analysis results according to the conditions. Based on the butt welding conditions, the residual stress and strain for the two welding methods are discussed, using calculations for the welding of C-seam (circumferential seam) and L-seam (longitudinal seam) used in the manufacture of pressure vessels.
(Received 9 August, 2022; Accepted 22 September, 2022) |
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| Key Words |
| sysweld, clad steel, simulation, welding, deformation |
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