RT journal article
T1 Low-Energy Pulsed-Laser Welding as a Root Pass in a GMAW Joint: An Investigation on the Microstructure and Mechanical Properties
A1 Chludzinski, Mariane
A1 Dos Santos, Rafael Eugenio
A1 Ortega Iguña, Marta
A1 Churiaque Bermejo, Cristina
A1 Porrúa Lara, Manuel
A1 Sánchez Amaya, José María
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
A2 Matemáticas
K1 gas metal arc welding
K1 pulse laser welding; root pass
K1 AH36 steel
K1 microstructure
K1 mechanical properties
AB Root pass is a fundamental step in multi-pass welding. In gas metal arc welding (GMAW), the weld bead qualities depend on the process parameters, filler materials, and welder abilities. This work investigates the effect of a Nd: YAG pulsed laser as a first pass to reduce the welders' reliance on the AH36 low-alloy steel with 5.5 mm thickness. This autogenous automatable process delivers reduced thermal impact due to the concentrated high-energy source, pulse overlap, and higher penetration depth-to-power ratio than continuous lasers. The outcomes indicate that the PL as a root welding generated a small HAZ compared to the GMAW condition. In addition, the subsequent arc passes positively affected the microstructure, reducing the hardness from around 500 to 230 HV. The PL + GMAW achieved similar strength results to the GMAW, although its Charpy impact values at -50 degrees C were around 15% lower than the arc condition.
PB MDPI
SN 1996-1944
YR 2022
FD 2022-11
LK http://hdl.handle.net/10498/28654
UL http://hdl.handle.net/10498/28654
LA eng
NO This work was financial supported from the Program for the Promotion and Impulse of Research and Transfer of the University of Cadiz (Reference project: IRTP02_UCA).
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026