研究目的
To produce sound Ti/Al dissimilar joints using laser-MIG hybrid welding–brazing without grooves, investigate their microstructure and mechanical properties, and optimize parameters to achieve good joint formation and strength.
研究成果
Laser-MIG hybrid welding–brazing successfully produced sound Ti/Al dissimilar joints with good wettability and mechanical properties. The IMC layer thickness and morphology varied, influencing tensile strength. Reinforced joints achieved 88% of AA6061 strength, with fractures in the HAZ, while unreinforced joints had 81% strength. The method shows promise for lightweight applications but requires control of IMC formation to optimize performance.
研究不足
The study is limited to specific alloys (AA6061 and Ti6Al4V) and joint configuration (butt without grooves). The thickness of IMC layers varied, potentially affecting joint strength, and the method may not be applicable to all joint sizes or materials. Optimization of parameters might be needed for different conditions.
1：Experimental Design and Method Selection:
The study used laser-MIG hybrid welding–brazing to join AA6061 aluminum alloy to Ti6Al4V titanium alloy in a butt configuration without grooves. The method was chosen for its energy efficiency and adaptability due to synergistic heat sources. Parameters were optimized for sound joints.
2：Sample Selection and Data Sources:
Base metals were AA6061-T6 aluminum and Ti6Al4V titanium sheets (100 mm × 50 mm × 1.2 mm), with Al–Si filler wires 4047 (Al-12Si, diameter 1.2 mm). Samples were prepared by mechanical grinding and chemical cleaning, and Ti6Al4V surface was coated with noncorrosive flux (KAlF4, thickness 20–30 μm).
3：2 mm), with Al–Si filler wires 4047 (Al-12Si, diameter 2 mm). Samples were prepared by mechanical grinding and chemical cleaning, and Ti6Al4V surface was coated with noncorrosive flux (KAlF4, thickness 20–30 μm).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a laser source (power 600 W), MIG arc torch, stereo microscope (JENOPTIK), optical microscope (ZEISS-A1M), scanning electron microscope (Hitachi-SU8010), energy-dispersive X-ray spectrometer (EDS; GENESS), mechanical tester (CMT4304), and digital microhardness tester (HXD-1000TM). Materials included base metals, filler wire, flux, and shielding Ar gas (99.999% purity).
4：999% purity).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Welding was performed with laser beam offset 0.5 mm toward Al alloy, wire feeding speed 2.2 m/min, welding speed 1.8 m/min, and double-sided Ar shielding. Post-welding, cross-sections were cut and analyzed using microscopes, SEM, EDS, tensile testing (loading speed 0.5 mm/min), and microhardness testing (load 100 g for 15 s).
5：5 mm toward Al alloy, wire feeding speed 2 m/min, welding speed 8 m/min, and double-sided Ar shielding. Post-welding, cross-sections were cut and analyzed using microscopes, SEM, EDS, tensile testing (loading speed 5 mm/min), and microhardness testing (load 100 g for 15 s).
Data Analysis Methods:
5. Data Analysis Methods: Microstructure was analyzed using SEM and EDS for elemental distribution. Tensile strength and microhardness were measured and compared. Data were interpreted to understand joint properties and fracture mechanisms.
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