BUILDING-UP METHOD BY TINKERING

PURPOSE:To improve productivity by fusing preliminarily a glass layer on the surface of a base metal prior to setting the base metal to a building-up device thereby obtaining welding uniform over the entire part. CONSTITUTION:The base metal 5 having a fused glass layer 6 coated preliminari ly with glass by a kind of enameling is set in the building-up device. The base metal 5 is inserted vertically into a combination and a closing member is fixed to the bottom end of the base metal 5 or, if necessary, in the position apart properly from the bottom end. The part lower than said member is attached to a base metal lifting mechanism. The base metal is preheated by a preheating coil 7 and the molten metal is poured into the space between the base metal 5 and heated mold 1 to induce the welding reaction with the surface of the preheated base metal. The base metal 5 is lowered after the required time and the build-up layer is successively solidified by a buffer mold 3 and a water cooled casting mold 4; at the same instant, the fresh molten metal is additionally poured into the mold 1 and same operation is thereafter repeated until the building-up is completed.