Abstract
Hastelloy X is a corrosion and heat resistance solution hardened nickel base super alloy. This alloy having an austenitic microstructure and in this regard is expected to be prone to hot cracking in fusion welding. In this research a 400W Nd:YAG pulsed laser and 600W continuous wave fiber laser welding are employed to weld a 2mm thick Hastelloy X plates. Comparison is made with regard to weld penetration and tendency of occurrence of solidification cracking in the weld metal and liquation cracks in the heat affected zone. It is found that with pulsed laser hot cracks are formed, however, with continuous wave laser hot cracking can be avoided. Increasing the laser pulse frequency and pulse duration resulted in a significant reduction in hot cracking tendency in pulsed laser welding. The reduction in cooling rate and thermal stresses during solidification and backfilling of liquated grain boundaries are proposed to be the factors contributing to the prevention or reduction of hot cracks in laser welding of Hastelloy X. With a 0.2mm beam diameter fiber laser at 500W power and 5mm/s travel speed full penetration weld was achieve with no observation of hot cracks in the weld cross sections.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
