Influence of shielding gas composition on weld structure in pulsed Nd: YAG laser welding
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Abstract:
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.
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Journal title
volume 1 issue 3
pages 35- 42
publication date 2013-07-01
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