이종소재 플라즈마 아크 용접부 국부 인장물성 평가 (Evaluation of Local Tensile Properties of Plasma Arc Welded Blank with Dissimilar Materials)

서지정보

· 발행기관 : 한국소성∙가공학회
· 수록지 정보 : 소성∙가공 / 33권 / 6호 / 429 ~ 434페이지
· 저자명 : 김민기, 정준영, 채유진, 송정한

초록

This study deals with evaluation of local tensile properties of plasma arc welded black with a combination of dissimilar materials. To obtain the local tensile properties, a miniatured tensile specimen was designed based on the hardness distribution in the weld zone. Tensile tests were carried out to acquire material properties of base metals (BMs) and the weld zone including the fusion zone (FZ) and the heat affected zone (HAZ). The ASTM standard subsized and the miniatured specimens were utilized for evaluating the properties of the base metals and the weld zone, respectively. Experiment results show the weld zone properties were totally different from that of the base metals in terms of both hardening and stress levels. The limit dome height (LDH) test was conducted to verify the obtained local tensile properties. Through the LDH test, the fractured region was confirmed that can be obviously estimated from the local tensile properties. The finite element method (FEM) was employed to simulate the LDH test with application of the local properties. It is noted from the simulation results that the strain distribution and the level of the maximum strain in the blank could be similarly predicted to the experiment when the local properties were applied.

영어초록

This study deals with evaluation of local tensile properties of plasma arc welded black with a combination of dissimilar materials. To obtain the local tensile properties, a miniatured tensile specimen was designed based on the hardness distribution in the weld zone. Tensile tests were carried out to acquire material properties of base metals (BMs) and the weld zone including the fusion zone (FZ) and the heat affected zone (HAZ). The ASTM standard subsized and the miniatured specimens were utilized for evaluating the properties of the base metals and the weld zone, respectively. Experiment results show the weld zone properties were totally different from that of the base metals in terms of both hardening and stress levels. The limit dome height (LDH) test was conducted to verify the obtained local tensile properties. Through the LDH test, the fractured region was confirmed that can be obviously estimated from the local tensile properties. The finite element method (FEM) was employed to simulate the LDH test with application of the local properties. It is noted from the simulation results that the strain distribution and the level of the maximum strain in the blank could be similarly predicted to the experiment when the local properties were applied.

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