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 processes and equipment, namely electric arc welding of 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 forming overlap welded joint; feeding steel electrode wire and performing welding in semi-automatic mode by means of electric rivets for welding periods 2 - 5 s at interruption intervals no less than 3 s between welding periods; 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 value 90 -180 A and voltage being less by 0.5 -3.5 V than set voltage for given electric current value.

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

2 cl, 1 tbl, 1 ex