Pulsed Nd: YAG Laser Parameters Effect on Welding Uncoated Advance  High Strength Steel (AHSS) for Automotive

Muhammad Naqiuddin Mat Salleh; Kazuhiko Yamasaki; Kazuhiko Yamasaki; Moinuddin Mohammed Quazi; Aiman Mohd Halil

Authors

Muhammad Naqiuddin Mat Salleh Joining, Welding, and Laser Processing Lab (JWL), Faculty of Mechanical and Automotive Engineering Technology, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
Kazuhiko Yamasaki Graduate School of Science and Engineering, Department of Mechanical Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi City, Ibaraki, 316-8511, Japan
Kazuhiko Yamasaki Graduate School of Science and Engineering, Department of Mechanical Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi City, Ibaraki, 316-8511, Japan
Moinuddin Mohammed Quazi Joining, Welding, and Laser Processing Lab (JWL), Faculty of Mechanical and Automotive Engineering Technology, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
Aiman Mohd Halil Joining, Welding, and Laser Processing Lab (JWL), Faculty of Mechanical and Automotive Engineering Technology, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia

Keywords:

Low power laser, pulse wave mode, parameter effects

Abstract

Pulse wave (PW) welding technique has become a more adequate process to produce a deep penetration welding with smaller fusion zone and heat affected zone (HAZ) for automotive steel joint. A 1.6 mm thickness of N22CB boron steel from advance high strength steel (AHSS) type was welded by using PW mode from a low power Nd: YAG laser. The process parameters studied in this paper were pulsed energy, Ep, focal length, F, and welding speed, S. Bead-on-plate (BOP) welding was used in this experiment. The effect of parameters on the weld pool geometry was studied. Higher pulsed energy gave high weld penetration and higher weld width, contributing to the bigger weld pool size. The positive defocus position of focal length produced weld geometry with high penetration depth and smaller bead width compared to the negative defocus position. Lower welding speed was capable to produce deep penetration depth as the high heat input produced.