On the Effect of Deoxidizing Elements of Electrode Wire for Water Vapour Welding

Abstract

The purpose of this research is to investigate the effect of the deoxidizing elements of the electrode wire on the water vapour welding of steel. The experimental results were as follows :
1) Tensile strength of a joint by the water vapour welding was high enough as compared with base metal, but its ductility was not so great. The welding was performed under welding conditions of both globular and dip transfer.
2) The effect of the electrode wire containing deoxidizing elements was recognized by the mechanical test of an each-side one-pass welded joint, but it could not be confirmed about the multi-pass all-weld metal obtained using various electrode wires.
3) The degree of oxidation of water vapour atmosphere was greater than that of carbon deoxide atmosphere. But there was no relationship between the occurrence of the blow holes in a weld metal and the content of the deoxidizing elements in steel electrode wire.
4) Diffusible hydrogen content of a weld metal obtained by water vapour welding was 15.5-28.5 cc/100 g depending on welding current.