Control of fume and deposition efficiency in roll arcing

The aims of the work reported here were to investigate means of reducing the amount of fume generated during the arcing process and ways of increasing the deposition efficiency of the arcing process. Two avenues of research were identified. These were the influence of a shielding gas and the effect of conditioning the roll surface prior to arcing. Preliminary experiments carried out in a laboratory were used to judge the potential of various shielding gases and forms of surface conditioning. Factory trials of the most promising approaches were then conducted.