Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials

Version 1 : Received: 28 April 2023 / Approved: 28 April 2023 / Online: 28 April 2023 (09:44:43 CEST)

A peer-reviewed article of this Preprint also exists.

Schwarzkopf, K.; Rothfelder, R.; Rasch, M.; Schmidt, M. Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials. Sensors 2023, 23, 4908. Schwarzkopf, K.; Rothfelder, R.; Rasch, M.; Schmidt, M. Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials. Sensors 2023, 23, 4908.

Abstract

Knowledge of the temperature evolution is crucial to understand and control laser beam welding of low-melting materials. Existing temperature determination approaches are restricted to i) one-dimensional temperature information (e.g. ratio-pyrometers), ii) a priori knowledge of the emissivity (e.g. thermography) and iii) high temperature regions (e.g. two-wavelength imaging). In this paper, a ratio-based two-color-thermography approach is developed that allows for two-dimensional temperature determination in low-melting temperature ranges (< 1200 K). For static measurement situations it is demonstrated, that temperature can be determined despite variation in signal intensity and emissivity with high accuracy. The two-color-thermography set-up is further transferred into a commercial laser beam welding machine and experiments are conducted for varying process parameters. The direct application of the developed two-color-thermography system in dynamic process situations is limited as image artifacts presumably caused by internal reflections inside the optical beam path are present.

Keywords

two-color-thermography; temperature; temperature determination; ratio-based temperature measurement; laser beam welding; low-melting materials

Subject

Engineering, Industrial and Manufacturing Engineering

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.