Method for making rock bits

Details Method for making rock bits Method for making rock bits

1978-10-23

1981-03-31

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175411, 76108R, E21B 1050

Patent

active

042588073

ABSTRACT:
Segments of a rock bit are secured together by electron-beam welding. The segments are slightly spaced apart prior to welding by a thin shim of alloying metal such as titanium which improves ductility of the weld and is a strong carbide-former during welding. The shim is positioned between adjacent segments in the region of the crown or dome of the bit. The resulting welded interface is a fine-grain stress-relieved structure with good ductility and resistance to cracking.

REFERENCES:
patent: 2831661 (1958-04-01), Brown
patent: 2885186 (1959-05-01), Hammer
patent: 3288981 (1966-11-01), Mabry et al.
Welding Handbook, pp. 47.39-47.43, 1/1971, 6th ed., vol. 3A.

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