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   Influence of Shielding Gas Composition on Weld Structure in Pulsed Nd: Yag Laser Welding  
   
نویسنده جوکار مصطفی ,مالک قاینی فرشید ,ترکمنی محمد جواد
منبع Journal Of Advanced Materials And Processing - 2013 - دوره : 1 - شماره : 3 - صفحه:35 -42
چکیده    This work studied the effect of additions of carbon dioxide to argon shielding gas on the weld shape and microstructure of st14 steel in pulsed nd: yag laser welding. by additions of carbon dioxide up to 15%,the weld area and depth/width ratio decreases while rising of carbon dioxide up to 25% causes increasing of weld area and depth/width ratio. it is observed that the weld metal microstructure is mainly constructed from polygonal ferrite under 0 to 15% co2 additions to argon, but both polygonal and acicular ferrites are observed as the co2 level of ar+ co2 mixtures increases from 15 to 25%. 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 Laser Welding ,Pulsed Nd: Yag Laser ,Argon Shielding Gas ,Carbon Dioxide ,Weld Microstruc
آدرس دانشگاه تربیت مدرس, استاد - دانشکده مهندسی مواد-دانشگاه تربیت مدرس تهران, ایران, دانشگاه تربیت مدرس, دانشکده مهندسی مواد-دانشگاه تربیت مدرس تهران, ایران, مرکز ملی علوم و فنون لیزر ایران، تهران, مرکز ملی علوم و فنون لیزر ایران، تهران, ایران
 
 

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