METHOD FOR WELDING TWO EDGES OF ONE OR MORE STEEL PARTS TO EACH OTHER INCLUDING A HEAT TREATMENT STEP AFTER THE WELDING STEP: PENSTOCK OBTAINED WITH SUCH A METHOD
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United States of America Patent
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Dec 4, 2014
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Jun 5, 2012
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Abstract
The present application describes a method for welding two parts to each other. The two parts are made from steel having a high thermomechanical yield strength. The welding method includes a welding step in which a weld bead is created inducing a heat-affected zone to appear. The method also includes a heat treatment step having a heating step, during which at least one portion of the weld bead and the HAZ is gradually heated to a treatment temperature; then a holding step in which the portion of the weld bead and the HAZ is kept at the treatment temperature; then a cooling step in which the HAZ and the weld bead are gradually cooled and pass from the austenitic transformation end temperature to the martensitic transformation end temperature of the steel of the parts in a time between 7.5 s and 8.5 s, and pass from the austenitic transformation end temperature to the martensitic transformation end temperature in a time shorter than 15.5 s. The present application also describes a penstock obtained with such a method.
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