Abstract
Arc-ultrasonic welding technology is one approach for refining the grain structure in titanium alloy welds. This paper reports work in which welds were produced in an α-β titanium alloy under a variety of conditions, including conventional gas tungsten arc welding (GTAW) and arc-ultrasonic GTAW. The results show that arc-ultrasonic energy refined β grain structure in the weld metal, and improved the fatigue life of weld joints. Ultrasonic energy enhances fluid flow, reduces temperature gradients, and causes a continual high frequency oscillation in the welding pool. These effects are believed to be responsible for refining the solidification structure and improving the performance of titanium weld joints.
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