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US 2011/0297449 A1Published application
Tool with welded cemented metal carbide inserts welded to steel and/or cemented metal carbide
AssigneeDennis Tool Company
InventorMahlon D. Dennis
Life of this patent
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Abstract
A wear insert comprised of cemented metal carbide is welded to a workpiece made of steel or cemented metal carbide without causing fracturing of the carbide or creating residual stresses that reduce the impact resistance of the part. The part is fabricated using a microwave sintering process prior to welding.
Claims28
A tool, comprising:
- a first element having at least a portion thereof made of an alloy of a Group VIII metal;
- and
- a wear insert having at least a portion thereof made from of microwave-sintered metal carbide cemented with a metal binder;
- the portion of the first element made of stainless steel and the portion of the wear insert second workpiece having adjacent surfaces joined by a weld extending along at least a portion of the adjacent surfaces comprising an inter-diffusion of the metal binder and the stainless steel.
1 more element
A tool comprising:
- a first element having a portion comprised of microwave-sintered metal carbide cemented with a metal binder;
- a wear insert having at least a portion thereof made from microwave-sintered metal carbide cemented with a metal binder;
- and
- the portion of the first element made of an alloy of a Group VIII metal and the portion of the wear insert second workpiece having adjacent surfaces joined by a weld extending along at least a portion of the adjacent surfaces comprising an inter-diffusion of the metal binder and the alloy of a Group VIII metal.
1 more element
A method of welding cemented metal carbide to an alloy of a Group VIII metal, comprising:
- fabricating a first part having a least a portion of it made from metal carbide and a metal binder sintered in a microwave furnace to form microwave-sintered, cemented metal carbide;
- placing a surface of a portion of the second element made of an alloy of a Group VIII metal adjacent to a surface of the portion of the first part made from microwave-sintered, cemented metal carbide;
- and
- welding the first part and second part along the adjacent surfaces of the first and second parts by positioning electrodes to conduct current across the boundary between the adjacent surfaces and supplying a pulse of current that heats the surface layer of each part, causing metal binder in the cemented metal carbide to wet the grains of metal carbide along the surface of the first part, and to inter-diffuse with the alloy of a Group VIII metal along the surface of the second element.
1 more element
A method of welding cemented metal carbide to another piece of cemented metal carbide, comprising:
- fabricating a first part having a least a portion of it made from metal carbide and a metal binder sintered in a microwave furnace to form microwave-sintered, cemented metal carbide;
- fabricating a second part having at least a portion of it made from metal carbide and a metal binder sintered in a microwave furnace to form microwave-sintered, cemented metal carbide;
- placing a surface of the portion of each of the two parts comprising microwave-sintered microwave carbide adjacent to one another;
- and
- welding the first part and second part along the adjacent surfaces by positioning electrodes to conduct current across the boundary between the adjacent surfaces and supplying a pulse of current through the electrodes that heats the surface layer of each part, causing metal binder in the microwave-sintered, cemented metal carbide of each part to wet the grains of metal carbide along the surfaces of the parts and to inter-diffuse.
2 more elements
Dependencies are inferred from the claim text.