Effect of Underwater Wet Welding Conditions on the Diffusible Hydrogen Content in Deposited Metal

摘要

In the study mercury displacement method was used for determination of diffusible hydrogen amount in deposited metal obtained during underwater wet welding with covered electrodes in laboratory conditions according to a two-level full factorial design for three factors. The factors and their levels were chosen among conditions and parameters of welding in accordance with the results of own preliminary studies. A statistical analysis succeeded in establishing an equations to correlate conditions of wet welding with diffusible hydrogen content in deposited metal. A comparison of the influence of studied variables with the results of preliminary studies was also made. In order to minimize diffusible hydrogen level, underwater wet welding with covered electrodes is to be carried out with negative polarity as well as the minimum value of welding current. Results of measurements of the diffusible hydrogen amount in deposited metal were in the range from 39.54 to 61.86 m1/100g. These results imply that it Is possible to obtain in wet welding conditions level of diffusible hydrogen content characteristic for welding in the air.