Work

Analytical model of the absorptance in full- and partial-penetration laser welding

Year: 2026

Type: article

Abstract: The investigation, description, and modeling of laser material processing requires knowledge of the power introduced into the workpiece and thus of the absorptance. Analytical expressions are derived for the calculation of the absorptance in a full-penetration welding keyhole that is opened at its top and bottom. The formulas can easily be adapted to also consider partial-penetration welding in which the keyhole is closed on the bottom. The absorptance is calculated as a function of the keyhole geometry, the Rayleigh length of the incident laser beam and the absorptivity of the welded material. Additionally, the absorptance during partial- and full-penetration welding of aluminum was determined experimentally by calorimetric measurements. The proposed model agrees well with the experimental results.

Source: The International Journal of Advanced Manufacturing Technology

DOI: 10.1007/s00170-026-17918-9

Authors: Jonas Wagner, Christian Hagenlocher, Florian Fetzer, Rudolf Weber, Thomas Graf

Institution: University of Stuttgart

Language: English

Topic: Welding Techniques and Residual Stresses

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,990

Funders: Deutsche Forschungsgemeinschaft, Universität Stuttgart