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Metals 2016, 6(10), 237; doi:10.3390/met6100237

The Effects of Pulse Parameters on Weld Geometry and Microstructure of a Pulsed Laser Welding Ni-Base Alloy Thin Sheet with Filler Wire

Key Laboratory for Precision and Nontraditional Machining Technology of Ministry of Education, Dalian University of Technology, Liaoning 116024, China
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Academic Editor: Giuseppe Casalino
Received: 31 August 2016 / Revised: 23 September 2016 / Accepted: 28 September 2016 / Published: 8 October 2016
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Abstract

Due to its excellent resistance to corrosive environments and its superior mechanical properties, the Ni-based Hastelloy C-276 alloy was chosen as the material of the stator and rotor cans of a nuclear main pump. In the present work, the Hastelloy C-276 thin sheet 0.5 mm in thickness was welded with filler wire by a pulsed laser. The results indicated that the weld pool geometry and microstructure were significantly affected by the duty ratio, which was determined by the pulse duration and repetition rate under a certain heat input. The fusion zone area was mainly affected by the duty ratio, and the relationship was given by a quadratic polynomial equation. The increase in the duty ratio coarsened the grain size, but did not obviously affect microhardness. The weld geometry and base metal dilution rate was manipulated by controlling pulsed parameters without causing significant change to the performance of the weld. However, it should be noted that, with a larger duty ratio, the partial molten zone is a potential weakness of the weld. View Full-Text
Keywords: pulsed laser welding; filler wire; Hastelloy C-276 thin sheet; weld geometry; microstructure pulsed laser welding; filler wire; Hastelloy C-276 thin sheet; weld geometry; microstructure
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MDPI and ACS Style

Chai, D.; Wu, D.; Ma, G.; Zhou, S.; Jin, Z.; Wu, D. The Effects of Pulse Parameters on Weld Geometry and Microstructure of a Pulsed Laser Welding Ni-Base Alloy Thin Sheet with Filler Wire. Metals 2016, 6, 237.

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