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AssigneeCaterpillar Inc.
InventorsPingshun Zhao, Howard W. Ludewig, Tao Hong, Fernando Martinez Diez, Michael Lynn Johnson, Kandarp Siddharthbai Patel, Zhaolin Hu, Steven R. Thompson
Estimating the term…
An apparatus for the heat-treating of a heat-hardenable steel cruciform article having a weld seam includes a heating element to heat the weld seam to a point that an austenitic transformation occurs, and a quenching chamber to cool the weld seam, causing the formation of Martensite and an associated expansion. The quenching is rapid since slow quenching may allow a crystalline phase other than martensite to form. The apparatus may comprise rollers operable to convey the welded cruciform article through the apparatus at a speed such that the weld seam is subjected to heating for a predetermined heat time sufficient to cause a formation of martensite there within, and such that the heated portion reaches the quenching chamber and is quenched to create a substantial amount of martensite, e.g., an amount sufficient to cause expansion of the part.
A method of stress treating a steel cruciform article by rapidly and permanently expanding a selected volume of the cruciform article relative to a portion of the article surrounding the selected volume, the selected volume including at least a portion of a longitudinal weld joint under tensile stress, the method comprising:
Dependencies are inferred from the claim text.