Abstract
High frequency plastic welding (HFPW) has been used for many years in industrial and medical applications due to its ability to produce high quality plastic welding in a short time, as well as good bond strength and surface quality. However, this process may produce weld defects, such as leakage and the lack or excess of weld thickness, that occasionally are not properly detected by visual inspection or welding machine control devices. In an attempt to overcome such problems, a SCADA system is developed and implemented into the PLC (programmable logic controller) of the welding machine so that it automatically accounts for the related welding defects. This software differs from that of the original welding machine in analyzing the welding curve points with a shorter testing time, sufficient to detect the defects. The software effectiveness is thoroughly verified by several experiments such as experimental data acquisition for the SCADA calibration, welding curve reliability tests, study of the autoclave influence on welding thickness variation, and the effect of excess air on the weld strength, which so far demonstrate that the HFPW machine, along with the new SCADA implementation, properly provide a high quality welding joint.
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