Investigation of composition and structure of weld metal of Kh20N9G2B type made in wet underwater welding

Abstract

The paper gives the results of investigations of variation of weld metal composition and structure in coated-electrode wet underwater arc welding of 12Kh18N10T steel. It is shown that unlike welding in air, in underwater welding the content of oxygen and hydrogen increases in the weld metal with simultaneous lowering of the quantity of ferritizers. Weld metal structure is characterized by presence of predominantly columnar crystallites, decreased fraction of grain-boundary δ-ferrite and increased volume fraction of oxide non-metallic inclusions, the quantity of which with 0.10 to 1.25 μm dispersion rises 1.5 to 2 times. 14 Ref., 4 Tables, 2 Figures.

Mathematical Analysis of the Influence of the Flux-Cored Wire Chemical Composition on the Electrical Parameters and Quality in the Underwater Wet Cutting

“…Underwater wet welding and cutting are carried out under complex conditions with limited diving time, the presence of hazardous factors that threaten the health of a diver. The use of manual methods of welding and oxy-arc cutting with stick electrodes leads to an increase in the labor intensity of work, limits visibility of the working area due to cloudy water and exposes the diver to the risk of electric shock when replacing the electrode [5,6].…”