Laser diode transmission welding of polypropylene: Geometrical and microstructure characterisation of weld

摘要: Abstract This study concerns the welding of polypropylene with diode laser using overlap joint method. The influence process parameters, both power (20–40 W) and speed (3–6 mm/s) on geometry microstructure weld zone were investigated. objective this work is to evaluate effects selected parameters seam geometry, defects material crystallinity. out coming results help choice that can satisfy demands users consumers respect good quality safety process. Microscopic observations performed cross section joining area reveal increase decrease scanning lead a larger volume more important depth penetration. elliptic. Fourier transform infrared (FTIR) spectroscopy method shows induces thermal degradation by random chain scissions. An crystallinity along was observed maximum reached in centre zone. Some produced occurrence void due decomposition vaporisation polypropylene.