Control weld geometric parameters when wet underwater welding

The aquatic environment has a significant impact on the efficiency of heat input to the base metal, significantly reducing the efficiency of the arc. As a result, in wet underwater welding, the penetration of the base metal is reduced compared to welding in the air with the same mode parameters. The purpose of the research was to determine the effectiveness of the influence of the parameters of the process of underwater wet welding with rutile-type flux-cored wire on the geometric parameters of the weld metal – its width and penetration depth of the base metal. In this case, the shape coefficient of the weld was determined - the ratio of width to penetration depth (W/P). It was found that the welding speed, wire feed speed and the amplitude of the welding torch oscillations have a significant impact on the ratio of the width to the penetration depth of the welds. The W/P ratio of welds decreases significantly with increasing welding speed without oscillation of the welding torch. So, when welding with transverse oscillations of the welding torch with an increase in the wire feed speed, it decreased from 7.14 to 3.85. And it linearly increased with increasing amplitude of the torch oscillations. It was found that the oscillation velocity, elongation of the flux-cored wire, and arc voltage have an insignificant effect on the W/P ratio.