Research about the Effect of Ultrasonic Impact on the Mechanical Property of Welded Butt Joint of P355NL1 Steel

Abstract:

Surface treatment was carried out on the butt joint weldment of P355NL1 steel by using the HJ-II-type ultrasonic impact machine. The ultrasonic impact current is 1.5A, the impact amplitude is 20 microns and ultrasonic impacting time is 5min. Tensile test was carried out for both treated specimen and un-treated specimen. The fracture observed with the scanning electron microscope of 6360LA type. The experimental results show that although the compressive residual stress can be obtained in the surface of weld toe area, and the grain size in the welded joint can be refined, but the mechanical property of the butt joint of P355NL1 steel can not be improved through the ultrasonic impact treatment. The main reason is that the ultrasonic impact layer is only 120um, it is to thin to compared to the thickness of the specimen.

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 4752-4755
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.4752
• Online since: September 2014
• Authors: Ying Xia Yu*, Bo Lin He, Zhi Jun Zhang, Jian Ping Shi
• Keywords: Butt Joint, Fracture, Mechanical Property, Ultrasonic Impact

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