Current treatment of chronic wounds
has been critically limited
by various factors, including bacterial infection, biofilm formation,
impaired angiogenesis, and prolonged inflammation. Addressing these
challenges, we developed a multifunctional wound dressing-based three-pronged
approach for accelerating wound healing. The multifunctional wound
dressing, composed of nanofibers, functional nanoparticles, natural
biopolymers, and selected protein and peptide, can target multiple
endogenous repair mechanisms and represents a promising alternative
to current wound healing products.
Online observation is expected to provide a better understanding of the cathodic cleaning of oxides from the molten pool during variable-polarity gas tungsten arc welding (VP GTAW) of aluminium alloys. In this paper, a machine-vision system with appropriate illumination and filtering is used to monitor in real time the effect of different process parameters on the cleaning of oxides from the molten pool during VP GTAW of Al 6061. Based on the observations, the process conditions under which a clean molten pool can be achieved are determined. In addition, the control of the welding process to maintain the consistency of cathodic cleaning is discussed. The results showed that in order to have an oxide-free molten pool, the solid surface in front of the molten pool should be cleaned from oxides by the electric arc. The choice of process parameters to satisfy this condition has been discussed. It was found that the percentage of direct current electrode positive (DCEP) polarity in the cycle of current has the highest impact on the cathodic cleaning, with the arc current having less influence, and the welding speed showing the least effect. Furthermore, in order to keep the consistency of oxide cleaning, process parameters should be set or controlled to maintain the cleaned zone larger than the molten pool.
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