炭酸ガス関口線材アーク熔接法について(第6報)

Abstract

We studied the shape of bead-i.e. penetration, width, hight of reinforcement, reinforced area, penetrated area and fused area-obtained by C. S. arc welding process. And this process was compared with various welding processes, i.e. argon arc, submerged arc and manual arc with two types of coated electrodes, about the items mentioned above and penetration ratio : penetration/width of bead.Moreover the electric energy needed to deposit unit length of bead was calculated, and the ratios of penetration, width of bead and fused area to the energy were compared.Next authors investigated the effects of oxygen added in the supplied gas in case of C. S. arc welding on the porosity of weld metal and the shape of bead.The results obtained are as follows.i) Penetration in case of C. S. arc welding is largest compared with those by other welding processes. It is 1.7 times of that by argon arc welding, 1.6 times of that by submerged arc welding and 2.2-3.8 times of those by manual arc weldings.ii) Penetration ratio in case of C. S. arc welding is largest among others, too.iii) In spite of the same proceeding rate of bead, width of bead by submerged arc welding is largest compared with C. S. and argon arc welding processes.iv) The electric energy needed to make the same length and penetration of bead is smallest in case of C. S. arc welding compared with others.v) With increase of oxygen content of supplied gas in case of C. S. arc welding, the penetration increases and width of bead decreases.vi) The limit of permissible addition of oxygen in supplied gas, below which the blow hole does not occur in bead, depends upon the degree of deoxidation of base metal and contents of deoxidizers of filler wire.