초록

A method for weld repair and rebuilding of worn and cracked diesel engine cylinder heads of the pot-type is used in railway locomotive diesel engines and the like. The method involves carefully controlled preheating, welding and cooling steps.

대표청구항 ▼

A method for repair and rebuilding of pot-type cast iron cylinder heads for diesel engines, said method including the steps of: determining the locations of any cracks and rejecting any heads unsuitable for repair; placing each non-rejected head in an individual insulated oven having an insulated li

A method for repair and rebuilding of pot-type cast iron cylinder heads for diesel engines, said method including the steps of: determining the locations of any cracks and rejecting any heads unsuitable for repair; placing each non-rejected head in an individual insulated oven having an insulated lid; preheating the head in the oven to a suitable temperature for welding; if required, building up the entire fireface with weld metal applied by gas welding; gas welding any cracks in the head while maintaining the preheat temperature and protecting the valve seats and injector well from contact with molton weld metal; and after welding, encapsulating the head in the oven with the lid in place and allowing to cool; wherein the improvements comprise; establishing said suitable preheating temperature at a minimum of about 1800 degrees F. and attaining said suitable temperature over a time period of at least 40 minutes; performing welding of the fireface and other repair areas with cast welding rod equivalent to AWS RC1-A specification; and continuing the encapsulated oven cooling step for a time sufficient to remove residual stresses.