深水湿法焊接气孔问题研究

STUDY OF POROSITY PRODUCED IN WETWELDING UNDER DEEP WATER

根据水下湿法焊条在压力舱内焊接的试验结果，讨论了焊接水深（１０～８０ｍ）对焊缝金属气孔生成的影响。指出：水下湿法焊接由于焊接冶金及熔池结晶的特殊性，容易生产内气孔．而外气孔则当水深增加至较深的深度时（一般为６０ｍ）才开始出现，且内外气孔数量均随水深的增加而增加；通过研究气孔数量随焊缝金属残余氢含量及氧含量变化的趋势，推断出水下湿法焊接气孔主要属于氢气孔。

This paper deals with the effect of water depth in the range of 10 to 80 metres upon the formation of porosity produced in the underwater wet welding on the basis of experimental re- sults in a pressure tank with wet welding electrodes. The results show that it is easy for the inner porosities to occur owing to the particularity of welding metallugy and solidification process of molten metal that the outer porosities begin to appear when the water - depth grows deeper. say, increases to 60 metres, that the numher of inner and outer porosities increases with the water - depth, and that porosities are all hydrogen - containing one. through the examination of the varia- tion of number of porosities with residual hydrogen/oxygen content in the weld metal .