THE INFLUENCE OF THE ELECTRODE TYPES ON THE CARBON MONOXIDE FORMATION DURING THE WELDING PROCESS

Abstract

A study on the dependence of the carbon monoxide concentration in the working area on the magnitude of the welding current and welding time while using electrodes of different types was conducted in order to choose the methods and means for the protection of welders. An analysis of the latest research and publications on air pollution in the working area by aerosols and gases generated during arc welding was performed. For the experimental determination of carbon monoxide concentrations in the welding area, an individual gas detector-analyzer was used. The research results conducted during arc welding in laboratory conditions using the full factorial planning of the FFE2 type experiment are presented. Based on the obtained regression models, graphical dependences of carbon monoxide concentration in the working area on the welding current and welding time were constructed when using the most common brands of electrodes. It was established that the largest amount of carbon monoxide is formed during welding at a current of 200 A with electrodes having a rutile-cellulose coating, in second place - with electrodes having a basic coating, and in third place - having rutile coating; after 5 minutes of welding with an electric current of 100 A, a larger amount of this gas is formed when using the electrodes having the basic coating. The obtained dependences make it possible to practically choose welding modes that ensure minimum levels of carbon monoxide emissions. A complex of modern solutions for reducing air pollution in the working area with carbon monoxide is given, which consists in the use of neutralization methods, ventilation means, and the use of appropriate means of individual respiratory protection, as well as controlling the air environment state during work.