The Effect of Laser Beam Wobbling Mode on Weld Bead Geometry of Tailor Welded Blanks

Abstract

As a higher weight leads to increased fuel consumption for the automobile industry, the body in white must be lighter to compensate for the weight of additional components. Therefore, tailored blanks are used, which reinforce the body in white only in areas where a higher strength or stiffness is necessary. The applicability of laser welding processes with its numerous advantages, such as low heat input and production efficiency, is often limited when joining imperfect edges steel sheets due to small gap bridging ability. To overcome this limit, recent developments in the laser industry have introduced a novel method to wider the applications of lasers through the utilization of fast beam oscillation techniques, also known as laser beam wobbling. In this study, the effects of the four different amplitudes (0.5 mm, 1 mm, 1.5 mm and 2 mm) of circular laser beam oscillation patterns on the weld bead geometry and microhardness distribution were investigated. The results revealed that the weld bead width increased with the increase of wobble amplitude. Moreover, the tensile strengths of the welded blanks were higher than the AHSS base metal for all amplitude levels.

A study of high frequency laser beam oscillation induced keyhole dynamics in laser powder bed fusion additive manufacturing process

“…As far back as the 1990s, Rubben et al 20 showed the bene ts of using a oscillating laser in the production of tailored blanks. Kuryntsev & Gilmutdinov 21 and Yuce 22 both demonstrated that laser oscillation can heal defects formed at the rst welding pass and bridge larger gaps, which are essential to applications with imperfect faying interfaces. Hao et al 23,24 tested a wide range of oscillation frequencies from 20 Hz to 1000 Hz on dissimilar steel systems to reveal the melt pool shape and melt track topology.…”

High frequency beam oscillation keyhole dynamics in laser melting revealed by in-situ x-ray imaging

“…As far back as the 1990s, Rubben et al 20 showed the benefits of using an oscillating laser in the production of tailored blanks. Kuryntsev & Gilmutdinov 21 and Yuce 22 both demonstrated that laser oscillation can heal defects formed at the first welding pass and bridge larger gaps, which are essential to applications with imperfect faying interfaces. Hao et al 23,24 tested a wide range of oscillation frequencies from 20 to 1000 Hz on dissimilar steel systems to reveal the melt pool shape and melt track topology.…”