Ti-6Al-4V合金フラッシュバット溶接継手の特性

概要

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The characteristics of flash butt welded (FBW) joints of a Ti-6Al-4V alloy were investigated by the conventional joint efficiency and by impact tests at various positions of joints in comparison to electron beam welded (EBW) joints.FBW joint has slightly lower joint efficiency than EBW because the fracture position is in heat-affected zone (HAZ) for FBW joint, while in base metal for EBW joint.But the impact value at bond line of FBW is higher than that of EBW joint. The difference in impact values at welded zone between FBW and EBW joints lies in the difference of microstructure. HAZ of FBW joint shows grain boudary α plus acicular α structure, while deposited metal and most part of HAZ in EBW joint show tempered α.This difference does not result from the difference in cooling rate from β region, but it is considered to be due to the effect of upset working with FBW. As for the fatigue test, 90% joint strength was achieved for FBW joint, which is very comparable to the ratio for carefully conducted EBW.
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