EXPERIMENTAL STUDY ON SLIP COEFFICIENT AND TENSILE STRENGTH FOR THE USE OF LASER PROCESSING IN HOLE DRILLING FOR HIGH-STRENGTH BOLT FRICTION JOINTS

Abstract

Because of its high processing accuracy, laser cutting is capable of not only contour cutting but also hole drilling. However, notches generated by welding loss at cutting start positions as well as hardening in the vicinity of the hole due to heat are negative characteristics of laser drilling. On the basis of a high-strength bolt friction joint experiment, which aims at applying a laser processing hole to a high-strength bolt, we report a slip coefficient and maximum tensile strength for laser drilling, which are equivalent to those of ordinary drilling.