研究目的
Investigating the welding of Superalloy Inconel 625 and duplex stainless steel 2205 (DSS 2205) using Ytterbium fiber laser at different heat inputs to improve mechanical properties and microstructure of the joint.
研究成果
The study successfully demonstrated the effectiveness of Ytterbium fiber laser welding for joining Inconel 625 and DSS 2205, achieving superior mechanical properties and microstructure with minimal defects. The optimal welding parameters were identified, and the method is recommended for industrial applications.
研究不足
The study focuses on thin sheets of Inconel 625 and DSS 2205, and the findings may not be directly applicable to thicker materials or other dissimilar material combinations.
1：Experimental Design and Method Selection
Ytterbium Fiber Laser system (YLR 2000) operating in continuous wave mode was used for laser butt welding without filler (autogenous welding). The spot diameter of focal beam used was 0.45 mm with a Gaussian profile.
2：Sample Selection and Data Sources
Elemental composition of as-received alloys of DSS 2205 and Inconel 625 sheets was obtained by spectro-chemical analysis. Specimens with dimensions of 30 mm × 50 mm × 1 mm for DSS 2205 and 30 mm × 50 mm × 1.1 mm for Inconel 625 were prepared.
3：List of Experimental Equipment and Materials
Ytterbium Optical Fiber Laser system (YLR 2000), Infrared pyrometer (Micro-Epsilon), SEM (Zeiss, Model: EVO 18 Research), Oxford EDS Detector, Universal Testing Machine (Zwick Roell, Ulm, Germany).
4：Experimental Procedures and Operational Workflow
Welding was performed at constant power of 2150 W with varying speeds from 3000 mm/min to 7000 mm/min. Shielding with Argon gas was used to prevent contamination. Temperature signal measurement of the weld pool was done using Infrared pyrometer.
5：Data Analysis Methods
Microstructure was studied using SEM and EDS. XRD analysis was used to study new phases. Micro-hardness was tested using Vickers Micro-hardness tester. Tensile strength was examined using Universal Testing Machine.
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