Welding dissimilar metal members with welded joint, including stabilized ferritic metal zone

Claim 1

A COMPOSITE WELDED ASSEMBLY FOR SERVICE AT CYCLICALLY VARYING ELEVATED TEMPERATURES AND PRESSURES, SAID ASSEMBLY COMPRISINIG A FERRITIC ALLOY MEMBER, SELECTED FROM THE CLASS CONSITING OF CARBON-0.5% MO, CARBON-2% CR-0.5% MO, CARBON-2 1/4% CR-1% MO, AND CARBON-5% CR-0.5% MO, AN AUSTENITIC ALLOY MEMBER, SELECTED FROM THE CLASS CONSISTING OF 18% CR-8% NI, 18% CR-8% NI-CB, 18% CR-8% NI-TI, 25% CR-12% NI, AND 25% CR-20% NI, A STABILIZED FERRITIC ALLOY STEEL INSERT, OF SUBSTANTIALLY THE SAME COMPOSITION AS SAID FERRITIC ALLOY MEMBER, INTERMEDIATE SAID MEMBERS; A FERRITIC ALLOY STEEL WELD METAL DEPOSIT, OF SUBSTANTIALLY THE SAME COMPOSITION AS SAID FERRITIC ALLOY MEMBER, UNITING SAID FERRITIC ALOY MEMBER TO SAID INSERT; AND AN UNSTENITIC ALLOY STEEL WELD METAL DEPOSIT, OF SUBSTANTIALLY THE SAME COMPOSITION AS SAID AUSTENITIC ALLOY MEMBER, UNITING SAID AUSTENITIC ALLOY MEMBER TO SAID INERT.

Claim 2

A METHOD OF JOINING A FERRITIC ALLOY MEMBER, SELECTED FROM THE CLASS CONSISTING OF CARBON-0.5% MO, CARBON2% CR-0.5% MO, CARBON-2 1/4% CR-1% MO, AND CARBON5% CR-0.5% MO, TO AN AUSTENITIC ALLOY MEMBER, SELECTED FROM THE CLASS COMPRISING 18% CR-8% NI, 18% CR-8% NI-CB, 18% CR-8% NI-TI, 25% CR-12% NI AND 25% CR-20% NI, FOR SERVICE AT CYCLICALLY VARYING ELEVATED TEMPERATURE AND PRESSURE, SAID METHOD COMPRISING DISPOSING A STABILIZED FERRITIC STEEL ALLOY INSERT BETWEEN THE MEMBERS; JOINING THE INSERT TO THE FERRITIC MEMBER BY FUSION DEPOSITING FERRITIC ALLOY STEEL, OF SUBSTANTIALLY THE SAME COMPOSITION AS SAID FERRITIC ALLOY MEMBER, THEREBETWEEN; AND JOINING THE INSERT TO THE AUSTENITIC MEMBER BY FUSION DEPOSITING AUSTENITIC ALLOY STEEL, OF SUBSTANTIALLY THE SAME COMPOSITION AS SAID AUSTENITIC ALLOY MEMBER, THEREBETWEEN.