Improvements in or relating to thermal spraying

摘要

A shroud 20 for thermal spraying torches has a baffle 22 which separates out from the spray stream the underheated or overheated particles 24 and 25 respectively thus providing a stream of particles 26 that are in the correct condition to adhere well to the substrate 23. In this way oxide levels are reduced together with the number of unfused and loosely adhered particles. There is further provided means 31 of removing most of the fume that builds up in shrouds by injecting gas transverse to the spray stream so "blowing away" the fume particles.