CAST IRON PART WITH STEEL PART ELECTRIC-ARC WELDING METHOD Russian patent published in 2007 - IPC B23K9/173 B23K9/23 B23K103/04 B23K103/06 

FIELD: welding production, namely welding cast iron parts with steel parts.

SUBSTANCE: method comprises steps of placing steel and cast iron parts in welding zone with gap 0.15 - 0.45 mm for receiving overlap welded joint; feeding steel electrode wire and performing welding in semi-automatic mode by means of electric rivets during welding period 2 - 5 s at interruption intervals between welding periods no less than 3 s; performing welding process in atmosphere of mixed gaseous carbon dioxide and oxygen at relation 83 -99% of CO₂ and 1 - 17% of O₂ at electric current 90 -180 A and voltage that is less by 0.5 - 3.5 V than set one for given electric current value; after setting four electric rivets cooling welding zone by means of compressed air stream till temperature less than 50°C; then going on welding.

EFFECT: improved quality of welded joint due to reduced probability of cracking occurring.

2 cl, 1 tbl, 2 ex