Abstract
In order to prevent the elevation of dew point of supplied gas for CO2-O2 arc welding, the cylinders of carbon dioxide of 3rd grade and of super-dried oxygen must be used, as previously reported. But it is not always easy to get the cylinders of such grade.
If it will be able to use an ordinary cylinder, which may cont ain free water, and to prevent simply the elevation of dew point of flowing gas, it will be very convenient for the CO2-O2 arc welding or the other gas-shield-arc welding processes.
For such purpose, flowing gases from the cylinders containing free water were desiccated with silica gel, activated alumina or pure calcium chloride. And the efficiencies of desiccation with such desiccants were compared.
According to the results of experiments, it is easy to supply a simple gas or mixed gas with dew point below -40°C, when supplied gas is desiccated with silica gel. or activated alumina.
