Influence of shielding gas composition on weld structure in pulsed Nd: YAG laser welding
محل انتشار: فصلنامه مواد پیشرفته و فرآوری، دوره: 1، شماره: 3
سال انتشار: 1392
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 146
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شناسه ملی سند علمی:
JR_JMATPR-1-3_005
تاریخ نمایه سازی: 12 مهر 1400
چکیده مقاله:
This work studied the effect of additions of carbon dioxide to argon shielding gas on the weld shape and microstructure of ST۱۴ steel in pulsed Nd: YAG laser welding. By additions of carbon dioxide up to ۱۵%,the weld area and depth/width ratio decreases while rising of carbon dioxide up to ۲۵% causes increasing of weld area and depth/width ratio. It is observed that the weld metal microstructure is mainly constructed from polygonal ferrite under ۰ to ۱۵% CO۲ additions to argon, but both polygonal and acicular ferrites are observed as the CO۲ level of Ar+ CO۲ mixtures increases from ۱۵ to ۲۵%. The shape and microstructure of pulsed Nd: YAG laser welds is believed to be closely related to laser absorption coefficient, laser energy absorption on the work-piece surface and formation of oxide layer on the work-piece surface.
کلیدواژه ها:
نویسندگان
M jokar
Department of Engineering Materials, TarbiatModares University, Tehran, Iran
F MalekGhaini
Department of Engineering Materials, TarbiatModares University, Tehran, Iran
M. J. Torkamany
Department of Engineering Materials, TarbiatModares University, Tehran, Iran -Iranian National Centre for Laser Science and Technology (INLC), Tehran, Iran