Infrared thermography of welding zones produced by polymer extrusion additive manufacturing

Published: July 02, 2016

Author(s)

Jonathan E. Seppala, Kalman D. Migler

Abstract

In common thermoplastic additive manufacturing (AM) processes, a solid polymer filament is melted, extruded though a rastering nozzle, welded onto neighboring layers and solidified. The temperature of the polymer at each of these stages is the key parameter governing these non- equilibrium processes, but due to its strong spatial and temporal variations, it is difficult to measure accurately. Here we utilize IR imaging - in conjunction with necessary reflection corrections and calibration procedures - to measure these temperature profiles of a model polymer during 3D printing. From the temperature profiles of the printed layer (road) and sub layers, the temporal profile of the crucially important weld temperatures can be obtained. Under typical printing conditions, the weld temperature decreases at a rate of approximately 100 C and remains above the glass transition temperature for approximately 1 s. These measurement methods are a first step in the development of strategies to control and model the printing processes and in the ability to develop models that correlate critical part strength with material and processing parameters.
Citation: Additive Manufacturing
Volume: 12A
Pub Type: Journals

Keywords

additive manufacturing, 3D printing, IR thermography, material extrusion, fused deposition modeling acrylonitrile butadiene styrene (ABS)
Created July 02, 2016, Updated October 06, 2017