PURPOSE: To obtain a material for the flat spring of a wire dot head reducing the occurrence of voids and microcracks due to welding by specifying the contents of Cr, Ni, Al, C, Mn and Si in a steel and precipitating an Ni-Al compound.
CONSTITUTION: A hardened material consisting of, by weight, 16.4W17.5% Cr, 6.5W7.5% Ni, 0.9W1.4% Al, 0.06W0.08% C, 0.4W0.9% Mn, 0.15W0.64% Si and the balance Fe and contg. a precipitated Ni-Al compound is used as a material for the flat spring of a wire dot head. By making use of the hardened material, the width of melting and the depth of penetration can be made larger in welding, and the occurrence of microcracks is reduced. Accordingly, the fatigue life of the part of the flat spring joined to an armature is elongated, and the wire dot head causes hardly a breakdown.
KAGEYAMA HARUMICHI
MATSUNAGA KAZUO
| JPS5551568A | 1980-04-15 |