A Better Way to Test Quality in Plastic Welds
Evaluation of plastic weld quality is a multi-industry
challenge. Typical methods of weld evaluation such as mechanical or leak
testing can determine whether a weld can accommodate a defined application
requirement, but do not indicate whether the weld itself is good. A good weld
is one in which the polymer chains from either side have diffused across the
joint. However, the success of the intermolecular diffusion cannot be
determined via the standard mechanical and leak tests.
Through previous work at EWI, we have determined that the most effective method for evaluating diffusion is a technique developed internally several decades ago. The process, first published in a paper presented at the Society of Polymer Engineers (SPE) Annual Technical Conference (ANTEC) in 2018, involves heat treating of polished cross sections. While this method has been used at EWI to good effect for years, it has always involved a manual process with a hot air gun. To make the process more consistent, internal research was conducted to apply controlled infrared (IR) lamp heating to perform the heat treating process. Selected cross-sections from previous internal research projects were re-polished and then heat-treated using the IR lamp to establish material-based heat-treating settings. The results and recommendations will be submitted for publication in the proceedings and presented at SPE’s ANTEC conference in 2021.
To learn more, contact Miranda Marcus at [email protected].
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