| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1688374 | Vacuum | 2014 | 9 Pages |
•EBW simultaneous with EB preheating or post-heating on titanium was a new technology.•The pattern of multi-beam was novel, and the power ratio of multi-beam put forward.•EB preheating/post-heating lowered temperature gradient of welding heating/cooling.•The weld morphology and microstructures with post-heating/preheating were verified.
Electron beam welding (EBW) with multi-beam is a novel method to decrease weld cracks, which is suitable for welding the parts in aero industries. We studied EBW with multi-beam on high temperature titanium alloy, which was refers to simultaneous EBW with electron beam (EB) preheating or post-heating. We proposed the ratio of the power for welding and preheating or post-heating, and modeled temperature fields and temperature histories by ABAQUS software. The results showed the temperature of EB post-heating was higher than that of EB preheating, and EB preheating and post-heating respectively lowered the temperature gradient of welding heating and welding cooling, which improved the uniformity of the temperature of EBW. The weld morphologies were consistent with those of the modeling, which verified the feasibility and effectiveness of the temperature fields modeled. The microstructures of the welds with post-heating were coarser than those with preheating. The microhardnesses of the welds with preheating and post-heating were more homogeneous. The influences of EB preheating and EB post-heating on EBW were discussed.
