PROCESS FOR PRODUCING WELDING MATERIAL, AND WELDING MATERIAL

摘要

This process for producing a welding material comprises, in the following order: a compound production step (S2) of kneading an alloy powder a first alloy powder having a first average particle diameter and a second alloy powder having a second average particle diameter, a water-soluble binder and water together to produce a compound; a drying step (S4); an extrusion step (S6); a defatting step (S8) of heating the resulting extrusion-molded product to a predetermined temperature that is equal to or higher than 400°C; a C-O reaction step (S10) of heating the extrusion-molded product to a predetermined temperature that ranges from 950-1150°C in a vacuum atmosphere; and a sintering step (S12) of heating the extrusion-molded product to a predetermined temperature that ranges from 1200-1350°C in a nitrogen gas atmosphere to produce the welding material. According to this welding material production process, it becomes possible to overcome all of six problems including a problem that cracking of the extrusion-molded product often occurs during the defatting step or the sintering step and a problem that the extrusion-molded product is disrupted readily.