研究目的
Investigating the joining of Ti (grade 2) to AA3105-O using Al-12Si-2.5Mg filler metal through pulsed Nd:YAG laser welding to achieve high-strength joints with minimized intermetallic compound formation.
研究成果
The study successfully demonstrated the joining of Ti (grade 2) to AA3105-O using Al-12Si-2.5Mg filler metal through pulsed Nd:YAG laser welding, achieving joint strength up to 98% of the Al base metal. The formation of intermetallic compounds was characterized, and the effects of Si and Mg on the joint's microstructure and mechanical properties were analyzed. The research highlights the potential for improving joint strength and flexibility through filler metal addition.
研究不足
The study notes the formation of porosity due to the exothermic effect of Mg addition and the presence of cracks near the Al/fusion zone boundary attributed to the difference in thermal conductivity between Al and Ti. The high thermal gradient across the interface also contributes to residual stresses.
1：Experimental Design and Method Selection
Pulsed Nd:YAG laser welding was used for joining Ti (grade 2) to AA3105-O with Al-12Si-2.5Mg filler metal. The welding was performed in a circular path by repeated overlapping laser pulses.
2：Sample Selection and Data Sources
Commercial sheets of Ti (grade 2) and AA3105-O were cut into 40×5 mm2 rectangle strips. Al-12Si-2.5Mg with 0.15 mm thickness was used as filler metal.
3：List of Experimental Equipment and Materials
Nd:YAG laser apparatus (Model IQL-10), SANTAM model STM-20 Universal Testing Machine, SEM model TESCAN MIRA 3, XRD equipment model X'Pert, Vickers microhardness tester model MMT1.
4：Experimental Procedures and Operational Workflow
The surface of the strips was degreased, polished, and cleaned before welding. Welding was performed with specific parameters including pulse energy, duration, frequency, and argon flow rate. Post-welding, samples were prepared for microstructural examination and mechanical testing.
5：Data Analysis Methods
Microstructural examination was conducted using optical and scanning electron microscopy. Mechanical properties were assessed through shear strength tests and microhardness measurements. XRD was used for phase analysis.
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