Welding method, filler metal composition and article made therefrom
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United States of America Patent
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Mar 30, 2004
Grant Date -
Mar 27, 2003
app pub date -
Oct 23, 2002
filing date -
Apr 28, 2000
priority date (Note) -
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Abstract
A weld filler metal alloy composition and a method for welding stainless steel components into a final assembly includes the steps of: austenitizing the stainless steel components to be welded at a temperature of 1800.degree. F.-2000.degree. F.; applying, using conventional arc welding techniques a solid wire of the filler metal alloy comprising in % by weight: up to 0.02% carbon; up to 0.8% manganese; up to 0.02% phosphorus; up to 0.015% sulfur; up to 0.6% silicon; 4.5-5.5% nickel; 0.4-0.7% molybdenum; 10-12.5% chromium; up to 0.1% copper; balance essentially iron and incidental impurities; and tempering the welded assembly welded at a temperature of 930.degree. F.-1300.degree. F. A second tempering step conducted at a temperature of 1095.degree. F.-1145.degree. F. may follow. The welding method can be used to make compressor impellers (6). The compressor impeller components comprise 13Cr-4Ni stainless steel.
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