Alternative Inspection Methods of Vapour Phase Soldering Work Zone

Vapour Phase Soldering (VPS) is a reflow soldering method used for special assemblies, where even heat distribution, uniform and high soldering quality is critical. To aim for the best joint quality, it is important to investigate the process and the state of the work zone. While VPS is a much more complex process than regular reflow methods, our paper aims to approach the monitoring of the work zone by novel and alternative paths, which can ultimately lead to a better control on the ovens, aiming for compliance with the zero-defect manufacturing, and Industry 4.0 directives. For our work, two paths were defined. With the use of an infracamera, the possibility of quantitative optical observation was investigated, also the equalized temperatures of the measured board can be verified. With pressure sensing, the state of the vapour blanket can be investigated, which can lead ultimately to more reliable working cycles. The latter method shows promising results pointing to more refined process control; the former method shows limitations in the application within the field of VPS.