Abstract
Titanium alloy is one of the most popular materials in engineering applications. Pulsed arc welding can obtain grain refinement of titanium that is a benefit for mechanical properties. However, the study found that the optimized effect decreased with some higher frequencies. Hence, the study of Ti-6Al-4V was carried out with higher-frequency region, and the reason was discussed. The fluid of molten pool had effect on microstructure and mechanical properties of welding joints. Simultaneously, the arc behavior with pulsing current was known as the important factor for the fluid status. Thus, the microstructural morphology, microhardness gradient, and mechanical properties were detected, which were also compared with other frequencies. With high frequency more than 50 kHz, the fluidity of molten pool decreased significantly with low ductility of joints. The mechanism simulation was produced with plane and ellipsoid assumptions, and the results indicated that the conflux caused impact region of double circulation, which was recognized as the main reason for the drops of microstructure and properties with more than 50 kHz.
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