Effect of different underwater environment media on composition and temperature of underwater welding arc plasma

By collecting and analyzing the underwater welding arc spectrum, the influence of the different water environment media such as clear water, boric acid solution, LiOH solution, and boric acid+LiOH mixture, on the composition and temperature of underwater welding arc plasma were studied. In addition, the composition and temperature of arc plasma during on-land welding and underwater welding were compared and analyzed. The results indicated that the effects of water media on underwater welding arc plasma are almost negligible. However, the H and O in arc plasma composition of underwater welding are significantly more than those in the on-land welding arc. Owing to the water environment, the arc temperature of underwater welding was lower than that of on-land welding arc.