Welding for spheroidal graphic cast iron material
Patent 5678753 Issued on October 21, 1997. Estimated Expiration Date: 
December 7, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 7, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2444654 2499827 3196537 3778588 Method of joining nodular cast iron to steel by means of fusion welding Patent #: 4817859 InventorAssigneeApplicationNo. 568836 filed on 12/07/1995US Classes:228/225, Plural filler applying219/137R, Process228/232, Including preheating228/262.4Ferrous metal memberExaminersPrimary: Ramsey, Kenneth J.Attorney, Agent or FirmForeign Patent References
International ClassB23K 009/235Foreign Application Priority Data1994-12-09 FRAbstractThe invention relates to the welding of cast-iron castings.The process for the fusion welding of spheroidal-graphite cast-iron castings comprises the following steps:a) a preheat at a temperature of between 230° and 300° C. is carried out before buttering the zone of the casting to be welded;b) a heat treatment at a temperature of between 800° and 920° C. is applied to the buttering for a suitable period and .then a cooling cycle is carried out;c) again, a preheat of the buttering is carried out at a temperature of between 130° and 200° C. and followed by a finish weld.Application to the repair of cast-iron castings and to the joining of cast-iron castings together or to steel castings. | |
