Abstract
Electron beam welding (EBW) is widely used to weld titanium alloy parts such as aero-engine casing and blades. The surface quality after EBW has a significant influence on the aero-engine performance of those parts. We propose a surface treatment method with grinding on a titanium alloy electron beam weld. We analyze the influence of grinding parameters on the characteristics of the grinding surface. The experiment shows the applicability of ground surface by belt grinding on EBW and its impact on aero-engine performance. After belt grinding, both the welded surface and the surface connected with the substrate are smooth. The extra height of the seam was less than 0.2 mm, and the surface roughness (Ra) of the weld after grinding can be less than 0.98 μm. The microstructure of the weld after grinding was analyzed. Two types of bionic shapes were obtained, a sawtooth shape with a width of 40 μm and a height of 10 μm and a wavy shape with a width of 20 μm and a height of 3 μm. From the analysis above, the bionic surface can be obtained by grinding on the weld with an abrasive belt.
Highlights
Electron beam welding is widely used in industry, especially in aeronautics and aerospace engineering
It is necessary to study the aerodynamic performance of the ground surface by belt grinding on titanium alloy electron beam welding (EBW)
Kar et al [1] studied the effect of electron beam scanning on the porosity generation and fatigue performance of welding joints of TC4 titanium alloy, and the results showed that electron beam scanning could reduce the porosity of welding joints and improve the fatigue performance of joints
Summary
Electron beam welding is widely used in industry, especially in aeronautics and aerospace engineering. It is necessary to study the aerodynamic performance of the ground surface by belt grinding on titanium alloy EBW. Lan et al [5] studied the effect of welding pores on the fatigue life of titanium alloy EBW joints. Single factor belt grinding tests of titanium alloy aero-engine blades were carried out by Chai et al [6]. It is of considerable significance to explore the belt grinding performance of complex surfaces with bionic structures; belt grinding experiments were carried out on the welds of titanium alloy EBW. The surface quality of the welds and the aerodynamic performance of the ground surfaces were analyzed to judge the property of titanium alloy EBW belt grinding with a bionic structure
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