公开(公告)号：ZA7804160B

公开(公告)日：1979-07-25

申请号：ZA7804160

申请日：1978-07-20

Applicant: SMITH INTERNATIONAL

Inventor： FOOR E ,  FISCHER J

IPC: B23K35/32 ,  E21B10/20 ,  B25D ,  E21C

CPC classification number: E21B10/20 ,  B23K35/325 ,  B23K2201/002

公开(公告)号：ZA784160B

公开(公告)日：1979-07-25

申请号：ZA784160

申请日：1978-07-20

Applicant: SMITH INTERNATIONAL

Inventor： FOOR E ,  FISCHER J

IPC: B23K35/32 ,  E21B10/20 ,  B25D ,  E21C

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.

公开(公告)号：BR7804675A

公开(公告)日：1979-02-06

申请号：BR7804675

申请日：1978-07-20

Applicant: SMITH INTERNATIONAL

Inventor： FISCHER J ,  FOOR E

IPC: B23K35/32 ,  E21B10/20 ,  E21B9/10 ,  E21B21/00 ,  B23K5/00

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.