Study of pores produced in underwater wet welding

0 IntroductionPore is one of the main defects produced in wet weld-ing, especially in deep water. The integrity, ductility,and strength of a wet weld will be reduced by the presenceof pores. It is very necessary to study the pore formation toimprove the quality of underwater wet welds and to ensurethe security and dependability of the welded structures.Underwater wet welding offers advantages such ashigh speed, good versatility, and cost effectiveness. It ischaracterized by lower visibility, …

Study of pores produced in underwater wet welding

This paper deals with the effect of water depth in the range of 10 m to 80 m upon the formation of pores produced during underwater wet welding. The results show that it is easy for the inner pores to occur owing to the particularity of the molten metal solidification that the outer pores begin to appear when the water depth increases to about 60 m, that the porosity increases and pore grows up as the water depth increases, and that pores are all hydrogen-containing ones through the examination of the variation of number of pores with the residual hydrogen and oxygen content in the weld metal.