THE EFFECTS OF WELDING PARAMETERS ON ULTRA- VIOLET LIGHT EMISSIONS, OZONE AND Cr~VI FORMATION IN MIG WELDING

摘要

This paper describes the relationships between ultra-violet emission, ozone generation and Cr~VI production in MIG welding which were measured as a function of shield gas flow rate, welding voltage, electrode stick-out and shield gas composition using an automatic welding rig that permitted MIG welding under reproducible conditions. The experimental results are interpreted in terms of the physico-chemical processes occurring in the micro- and macro-environments of the arc as part of research into process modification to reduce occupational exposure to ozone and Cr~VI production rates in MIG welding.