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Research of Laser Welding Process for 409L Stainless Steel Tube

Author: FeiYu
Tutor: LinSanBao
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Ferritic stainless steel Laser Welding Microstructure Mechanical properties
CLC: TG456.7
Type: Master's thesis
Year: 2008
Downloads: 137
Quote: 3
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Abstract


Automotive exhaust system steel has good formability, high temperature oxidation resistance , high temperature fatigue resistance and corrosion resistance , 409L ferritic stainless steel well positioned to meet these requirements and also when compared with the cost of austenitic stainless steel advantages, so widely used . In this paper, ferritic stainless steel 409L laser welded design different sets of welding parameters , it is preferable to obtain a better weld joint performance parameters of the mechanical properties of samples were tested, and the use of optical microscopy, scanning electron microscopy micro connector organization were analyzed. Designed 1.5mm thick 409L multiple ferritic stainless steel pipe welding parameters by the analysis of macro-morphology of the weld , joint properties selected to obtain a better laser power and welding speed range of parameters . The results show that: 3KW ~ 3.4KW, 4.2m/min ~ 5m/min welding parameters of this range to obtain the best macro-morphology of the weld . Forming a good weld appearance defect ; aspect ratio is large, the size of the fusion zone and smaller , to meet the requirements of high-quality weld . The effects of different process parameters on the welded ferritic stainless steel tensile impact , through comparative experiments to determine the welding process parameters on the mechanical properties of welded joints were investigated . The results showed that: a laser power of 3170W, welding speed 4.52m/min, the defocus amount is -0.45mm laser welding welding parameters obtained the best mechanical properties of the specimen , up to 22% elongation , tensile strength 420MPa about 95% of the base material . By analyzing the ferritic stainless steel tube microstructure photomicrographs observed within the grain boundary and grain does not appear precipitates θ phase , summed up the fusion zone and the heat affected zone microstructure change and its effects on the mechanical properties of the law ; observed fracture scan photos found weld area after fracture , there is a clear necking phenomenon undergone significant plastic deformation and fracture are showing dimple . Weld has excellent ductility, toughness , to meet the requirements for further mechanical processing .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Special welding > Laser welding
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