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Details for Patent: 3,890,137

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Details for Patent: 3,890,137

Title: Welding powder for producing wear-resistant layers by build-up welding
Abstract:A welding powder contains a first component selected from the group consisting of molybdenum, tungsten, and a mixture of these two metals and a second component of at least one element selected from the group consisting of oxygen, nitrogen, hydrogen and carbon. The second component of oxygen, nitrogen, hydrogen or carbon is present in the metal of the welding powder partly in an unbound, dissolved state.
Inventor(s): Beyer; Horst (Burscheid, DT), Buran; Ulrich (Burscheid, DT)
Assignee: Goetzewerke-Friedrich Goetze AG (Burscheid, DT)
Filing Date:Mar 15, 1974
Application Number:05/451,678
Claims:1. A welding powder for producing wear-resistant layers by build-up welding, consisting essentially of:

a. a first component selected from the group consisting of molybdenum powder, tungsten powder, an alloy of molybdenum and tungsten in powder form, and a mixture of molybdenum powder and tungsten powder; and

b. a second component of at least one element selected from the group consisting of oxygen, nitrogen, hydrogen and carbon, said second component being present partly in a free, unbound, dissolved state; and

when oxygen is present as the welding powder, it is present in an amount of about 0.001 to about 12 percent by weight, with the free oxygen content being from about 0.00001 to about 0.12 weight percent;

when nitrogen is present in the welding powder, it is present in an amount of about 0.001 to about 0.5 percent by weight, with the free nitrogen content being from about 0.00001 to about 0.00005 weight percent;

when hydrogen is present in the welding powder, it is present in an amount of about 0.001 to about 0.5 percent by weight, with the free hydrogen content being from about 0.00001 to about 0.005 weight percent; and

when carbon is present in the welding powder, it is present in an amount of about 0.01 to about 2.5 percent by weight, with the free carbon content being from about 0.003 to about 0.8 weight percent.

2. The welding powder as defined in claim 1 wherein the welding powder contains 0.01 to 20 percent by weight copper or a copper alloy.

3. The welding powder as defined in claim 1, further containing at least one carbide forming element of titanium, tantalum, niobium, zirconium, chromium or vanadium, or alloys thereof.

4. The welding powder as defined in claim 3 wherein the sum of the content of the carbide forming elements is 50 percent by weight maximum.

5. The welding powder as defined in claim 1, further containing elementary boron.

6. The welding powder as defined in claim 5 wherein the boron content is from about 0.001 to about 20 percent by weight.

7. The welding powder as defined in claim 1, containing carbon dust.

8. The welding powder as defined in claim 7 wherein the carbon dust is soot or graphite dust.

9. The welding powder as defined in claim 1 and further containing iron carbide powder.

10. The welding powder as defined in claim 1 and further containing a minor amount of iron powder or a powder of an iron alloy.

11. The welding powder of claim 1 which contains carbon and oxygen as a second component.

12. The welding powder as defined in claim 1 which contains oxygen as a second component.

13. The welding powder as defined in claim 1 which contains oxygen, nitrogen, hydrogen and carbon as a second component.
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