Abstract
Glass materials have been widely used in optics, MEMS, electronics and biomedical applications because of their excellent optical, mechanical and chemical properties. Fusion welding by ultrashort pulsed laser has been proposed as a promising technique for glass joining, since joining can be accomplished without any intermediate layer and mechanical contact. In this study, a method of evaluating the weld bead in the fusion welding of glass by picosecond pulsed laser was discussed, and its mechanical strength was investigated. A larger optical contact area had a great influence on the shear load of weld bead, while a smaller optical contact area could reduce the influence of the contact area on the measurement of shear load. Therefore, it was important to reduce the optical contact area to evaluate the shearing strength of weld bead accurately. The shear stress of weld bead decreased at a low pulse repetition rate, while it could increase at a proper pulse repetition rate.
