Method for manufacturing large diameter internal combustion engine crankshaft round handle arm by electroslag casting and welding technique

The invention relates to a method for using electro-slag cast and fusion welding process to make large diameter internal combustion engine crankshaft round handle arm, the method is as follows: (1) adjusting and treating well the horizontal mould; (2) plugging the two ends of the consumable electrode into the mould; (3) adding ternary slag to the mould; (4) sending electricity to complete the transformation of electric energy to heat energy; (5) the consumable electrode melting to form steel water melting drip passes the slag pool and the slag pool absorbs the harmful elements of the metal materials; (6) forming melting pool, solidifying and moulding to form round handle arm type casting; (7) fusion welding main journal; (8) fusion welding to take shape for the free end and output end of the crankshaft. The superiority of the method is: (1) the crankshaft round handle arm moulding direction of the electro-slag is the same with the stress direction, thus improving the stress strength; (2) the chemical componen