Hardfacing process and parts produced thereby
AssigneeCaterpillar Inc.
InventorsRobert Lee Meyer, Fernando Martinez Diez
Life of this patent
Estimating the term…
Abstract
A hardfacing process includes depositing a clad layer having a thickness greater than about 1 mm (0.04 in) on a surface of the component by arc welding, and creating a heat affected zone directly below the clad layer due to the depositing. The heat affected zone may be a region of the component where a lowest hardness is more than 40% lower than a base hardness of the component below the heat affected zone. The method may also include heat treating the component after the deposition such that the lowest hardness in the heat affected zone is restored to within about 15% of the base hardness of the component.
Claims13
A hardfacing process for a component subject to wear, comprising:
- depositing a clad layer having a thickness greater than about 1 mm (0.04 in) on a steel body of the component using an arc welding process, the steel body having a hardness between about 43 HRC and 60 HRC;
- and
- heat treating the component after the cladding, the heat treating including;
- austenizing the component;
- quenching the component in a liquid bath;
- and
- tempering the component after removing,
- wherein quenching the component includes:
- dropping the component which is at a temperature between about 875° C. (1607° F.) and 900° C. (1652° F.) into a water bath maintained at a temperature between about 35° C. (95° F.) and about 41° C. (106° F.), and
- removing the component from the liquid bath such that a residual temperature of the component is between about 100° C. (212° F.) and 300° C. (572° F.), and
- wherein tempering the component includes:
- transferring the component at the residual temperature into a temper furnace maintained at a tempering temperature, and
- maintaining a temperature of the component between about 143.3° C. (290° F.) and about 154° C. (309° F.) for a predetermined period of time,
- wherein depositing a clad layer includes creating a heat affected zone directly below the clad layer due to the depositing, the heat affected zone being a region of the body where a lowest hardness is more than 40% lower than a base hardness of the steel below the heat affected zone, and the heat treating includes heat treating the component such that the lowest hardness of the heat affected zone is restored to within about 15% of the base hardness.
A method of hardfacing a track shoe having a grouser, comprising:
- depositing, by arc welding, molten cladding material on a surface of the grouser to form a clad layer having a thickness greater than about 1 mm (0.04 in);
- steering the cladding material such that the clad layer substantially conforms to a shape of the grouser;
- creating a heat affected zone directly below the clad layer due to the depositing, the heat affected zone being a region of the component where a lowest hardness is more than 40% lower than a base hardness of the component below the heat affected zone;
- and
- heat treating the component after the depositing such that the lowest hardness in the heat affected zone is restored to within about 15% of the base hardness of the component, wherein the heat treating includes:
- austenizing the component;
- quenching the component in a liquid bath by:
- dropping the component which is at a temperature between about 875° C. (1607° F.) and 900° C. (1652° F.) into a water bath maintained at a temperature between about 35° C. (95° F.) and about 41° C. (106° F.), and
- removing the component from the liquid bath such that a residual temperature of the component is between about 100° C. (212° F.) and 300° C. (572° F.);
- and
- tempering the component after removing by:
- transferring the component at the residual temperature into a temper furnace maintained at a tempering temperature, and
- maintaining a temperature of the component between about 143.3° C. (290° F.) and about 154° C. (309° F.) for a predetermined period of time.
Dependencies are inferred from the claim text.