Abstract
Laser welding of HASTELLOY X is highly feasible; however, hot cracking can be a matter of concern. The objective of this study is to assess the effect of solution heat treatment on susceptibility to liquation cracking in welding of a 2-mm-thick HASTELLOY X plate. In addition, Nd-YAG pulsed laser (400 W) and continuous wave (CW) fiber laser (600 W) were compared with each other in this respect. Results revealed that performing the prewelding solution heat treatment reduces the tendency for occurrence of liquation cracking. Furthermore, it was established that by increasing pulse frequency, there was a significant reduction in the tendency for liquation cracking. With CW laser welding of HASTELLOY X in the solution-heat-treated condition, the tendency for heat-affected zone (HAZ) cracking was found to be minimized.
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Notes
HASTELLOY is a trademark of HAYNES INTERNATIONAL, INC.
INCONEL is a trademark of HUNTINGTON ALLOYS CORPORATION, Inco Alloys International, Inc.
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Acknowledgment
The authors thank the Iranian National Center for Laser Science and Technology (INCL) for their technical and laboratory instrument support.
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Manuscript submitted November 16, 2016.
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Pakniat, M., Ghaini, F.M. & Torkamany, M.J. Effect of Heat Treatment on Liquation Cracking in Continuous Fiber and Pulsed Nd:YAG Laser Welding of HASTELLOY X Alloy. Metall Mater Trans A 48, 5387–5395 (2017). https://doi.org/10.1007/s11661-017-4300-x
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DOI: https://doi.org/10.1007/s11661-017-4300-x