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Hot Cracking Behavior in Inconel 690 Overlay Welds on Mn-Ni-Cr-Mo Steel for Pressure Vessels  

양병일 (두산중공업 기술연구원)
김정태 (두산중공업 기술연구원)
신용범 (부경대학교 공과대학 재료공학부)
안용식 (부경대학교 공과대학 재료공학부)
박화순 (부경대학교 공과대학 재료공학부)
Publication Information
Journal of Welding and Joining / v.20, no.2, 2002 , pp. 82-89 More about this Journal
Abstract
In order to clarify hot cracking phenomena occurred in Inconel 690 welds and it's prevention, in this study, the cracking behavior and the influence of welding variables on cracking in Inconel 690 overlay welds on Mn-Ni-Cr-Mo steel(SA 508 cl.3) for pressure vessel were investigated by using mock-up test. The main results are as follows: The cracks in Inconel 690 overlay welds were mainly generated near the start and the end part of welding beads adjacent to STS 309L welded outside of Inconel 690 welds. Most of the cracks showed typical solidification crack, and also it was assumed that there was possibility of liquation cracking in HAZ. The existence of Nb constituents or concentration of Nb was recognized on the fracture facets of the solidification cracks in the welds by SMAW. Therefore Nb was considered to be the main factor of the solidification cracking. As the weld heat input was more increased and the weld bead length was longer, the extent of cracking was more increased. Moreover the extent of cracking was considerably decreased by changing of welding sequence to the start and the end part of welds. Hot cracking in welds by GTAW was considerably decreased as compared with that of SMAW. And cracks were well generated in the Inconel 690 overlay welds adjacent to 575 309L welds. This means that the hot cracking susceptibility of Inconel 690 welds was largely varied by chemical components and/or compositions of filter metals, base metals and neighboring welds.
Keywords
Ni-base super alloy; Inconel 690; SA 508 cl.3 steel; STS 309L stainless steel; Overlay welds; SMAW; GTAW; Hot cracking; Solidification cracks; Liquation cracks;
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