Comparative study on the common bipolar plate welding processes and their joint microstructures and performance
In order to study the welding methods suitable for metal bipolar plates,0.1 mm 316L stainless steel was welded by four common bipolar plate welding methods:laser welding,vacuum diffusion welding,brazing and ultrasonic welding.The potentiodynamic polarization curves of four kinds of welded joints were measured by using CHI-604E electrochemical workstation.The electrochemical corrosion properties of four kinds of welded joints were compared,and the electrochemical corrosion behavior was analyzed by combining microstructure and chemical composition.It is found that the corrosion resistance of vacuum diffusion welded joints and laser welded joints is strong,and the corrosion resistance of ultrasonic welded joints and brazed joints is weak.The post-weld deformation of four kinds of welded specimens was measured by laser spectral confocal microscope.Under the action of fixture,the deformation of laser welded specimens was smaller than that of other specimens.The welding time and welding process used in the welding process of the four welding methods were compared.After comprehensive comparison,laser welding is finally determined as the best choice for these four common metal bipolar plate welding methods.
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