Abstract
The influence of distance between heat sources (Distance between the axis of laser beam and the tip of tungsten electrode, Dla) on energy transfer behavior in keyhole during laser-arc hybrid welding titanium alloy is studied. Energy analysis method was adopted to analyze the dimension parameters and welding efficiency of welds. A “sandwich” structure consisting of SiO2 glass and titanium alloy plate was used to directly monitor the physical characteristics of hybrid arc and laser keyhole. With spectral diagnosis method, coupling discharge states of hybrid plasma under different Dla were analyzed. The experimental results show that Dla greatly affects the energy transfer mode in keyhole. Precisely adjusting Dla can change the coupling state of heat sources and the inclined angle of keyhole wall, control the energy transfer mode in keyhole, and improve the heating capacity of heat sources. In addition, two transfer modes of “bottom absorption” and “sidewall absorption” exist in keyhole. When Dla is equivalent to the length of the original arc column, the coupling state is better, the inclined angle is smaller, and the transfer mode is dominated by “bottom absorption”. When Dla is changed, the coupling state changes subsequently, the inclined angle increases and the transfer mode changes to “sidewall absorption”.
Published Version
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