Fundamental Research on Welding of Special Steels (Report2)

Effact of Arc-Welded Bead on Energy Necessary for Statical Bending-Break of Alloy Steel Plate

Abstract

In this research, the authors designed and manufactured a special apparrtus for statical bendingbreak tests of plates, and statically broke unaffected plates made of alloy steels and plates deposited with a single bead using the apparatus. And they measured the energies necessary for the statical bending-break, and compared the numerical value of the former with that of the latter. In this manner, the following results were obtained.
(1) The energy necessary for the statical bending-break of a rectangular alloy steel plate deposited with a single bead is very smoller than that of the unaffected plate having the same composition and heat-treated in the same manner without weld-deposition. That is, the effect, of a bead deposited with arc on the necessary energy is very large.
(2) The energy necessary for the statical bending-break of alloy steel is variable with the kind of alloy steel considerably. Namely, if we assume that the toughness of a steel plate can be expressed in sgch a numerical value, the toughness varies with the kind of alloy steel in a marked degree.
(3) The authors called the numerical value, which is obtained with dividing necessary energy for the unaffected plate by that for the plate deposited with a single bead, in the term of the sensibility value for weld-deposition. Then they proposed to express the sensibility for weld deposition in such a numerical value. That is, this property varies remarkably with the kind of alloy steiel. And the authors considered that the phenomenerr of (1) is closely bound up with the formation of the hardened. zone adjacent to the bead deposited.