Translated Title
Microstructure and Mechanical Property of Joints in Laser Welding of Stainless Steels with Nitrogen Shielding Gas
Translated Abstract
With different proportions of nitrogen-argon hybrid shielding gas,the experiment of CO2 laser welding of 2 mm thick SUS301L austenite stainless steel is conducted.The microstructure,comprehensive mechanical,and surface corrosion-resistance properties under different proportions of nitrogen shielding gases are investigated.Experimental results indicated that,under different proportions of nitrogen shielding gases,the micro-morphologies of weld joints have no obvious difference,the nitrogen contents are the same as that of steel substrate,and the phase components are all γ-austenite with combination of a small amount of δ-ferrite;the tensile strength,bend strength,and micro-hardness of weld joints are comparable with that of steel substrate;the weld joint under the shielding of Ar gas possesses the best corrosion resistance property;with the increment of nitrogen content in shielding gas,corrosion resistance of weld joint surface gradually decreases,but the corrosion rate shows a lowering trend.
Translated Keyword
microstructure
laser technique
laser welding
nitrogen shielding gas
corrosion-resistance property
notched tensile
austenite stainless steel
Access Number
WF:perioarticalzgjg201612012
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