|
|
|
| Study on the Morphology and Microstructure of TA15 Titanium Alloy EBW Welded Joint |
| KUANG Xiaocong1,2, PU Wende1, FU Pengfei2,WANG Xichang2, KE Liming1 |
(1. National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,
Nanchang Hangkong University, Nanchang 330063, China;
2. Power Beam Processing Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China) |
|
|
|
Abstract In this article, TA15 titanium alloy was welded by electron beam welding with different process parameters,
the morphology of welded joints were investigated by observing the morphology of the welded joints and measuring
the shape parameters, and the microstructure of the welding joint was analyzed. The results show that the weld penetration,
half of width and weld width increase when the electron current increases, and the weld shape changes from the nail shape
to the bell shape. The welding speed has little effect on the weld shape, the weld penetration, half of width and weld width
decreases with the increase of the welding speed, and the ratio of depth to width increases first and then decreases. The
increase of focusing current has a large effect on the weld penetration, but the half of width and weld width change little.
when the scanning amplitude increases, the weld penetration decreases, half of width increases. The heat affected zone (HAZ)
near the base metal was similar to the base metal, Which was mainly composed of the primary equiaxed α phase and transformed
β phase, and the acicular (α+β); The HAZ near the fusion line was consist of α phase and acicular (α+β), and appear
α´; the microstructure of fusion zone was α´, the columnar crystals grew perpendicularly to the weld center, and single or
multiple columns of equiaxed grain formed in the weld center.
|
|
|
|
|
|
|
|
|
2017, 
