Weldable oxide dispersion strengthened alloys

In a process for producing by welding a composite structure including at least one member made of Cr-Al-Fe oxide-dispersion strengthened alloy, the improvement which comprises forming a fusion weld in the structure using a weldable alloy, said weldable alloy being a ferritic oxide dispersion strengthened alloy which is substantially titanium-free and contains a minor amount of at least one of the additives tantalum, niobium or hafnium.

As a new article of manufacture, a welded structure comprised of at least one oxide dispersion strengthened, ferritic member comprised of iron-chromium-aluminum, said member having a fusion weld deposit characterized by good dispersoid distribution and said welded structure having a room temperature strength of at least 600 MPa said oxide dispersion strengthened alloy being substantially titanium-free and consisting essentially, by weight, of about 12 to about 30% chromium, about 11/2 to about 10% aluminum and in addition containing from 1/4% up to about 6% total of at least one additive selected from the group tantalum, niobium and hafnium, and the balance essentially iron, and further containing a small but effective amount for increased high temperature strength up to about 10% by volume of an oxide dispersoid.