FIELD: instrument engineering.
SUBSTANCE: group of inventions relates to drill bits and method for manufacture thereof. According to the method of manufacturing a drill bit, the size of the root clearance is chosen between approximately 0.635 mm and approximately 1.524 mm; size of the blunting of the root of the weld is selected, approximately equal to or less than the selected size of the root clearance; root clearance with a size equal to that selected is mounted between the drill bit module and the drill bit case; and multipass weld with the selected dimensions of the root gap and blunting of the root of the seam is formed between the module and the housing using the material of the weld, at least one property of which exceeds in magnitude the analogous property of the material of the materials being joined. Size of the seam root blunting is smaller than the size between the drill bit module and the housing of the drill bit.
EFFECT: technical result is to increase the service life of the drill bit.
18 cl, 7 dwg
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