CAST-WELDING ALUMINUM ALLOY AND CAST-WELDING METHOD

摘要

PURPOSE:To obtain an Al alloy having strong cast-welding power, by letting Al contain specified amounts of one or more of Si, Mg, Cr, Ti and Zr. CONSTITUTION:The composition of a cast-welding Al alloy is determined as, by wt%, one or more of 2-6 Si, 1.2-9 Mg, 0.4-1 Cr and 0.15-0.8 Zr, and the balance Al and inevitable impurities. A steel pipe, degreased by sand-blasting and preheated at 800 deg.C or so, is located in a main mold 2a. The melt 5a of said cast-welding Al alloy is poured into the main mold 2a. After the laps of 15sec, the melt 5a is charged with hydrostatic pressure of 200kg/cm2 or more by pressing it with a press punch 6a. When the steel pipe is welded to an Al alloy by use of the welded joint formed in this way, the welded article satisfying pressure-resistance and joint strength is obtained.