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1. (WO2006118936) WELDING TOGETHER LOW AND HIGH CARBON STEELS

Pub. No.:    WO/2006/118936    International Application No.:    PCT/US2006/015994
Publication Date: Fri Nov 10 00:59:59 CET 2006 International Filing Date: Wed Apr 26 01:59:59 CEST 2006
IPC: B23K 26/24
B23K 11/14
B23K 26/32
B23K 11/00
B23K 20/02
Applicants: THE TIMKEN COMPANY
MILAM, David, L.
Inventors: MILAM, David, L.
Title: WELDING TOGETHER LOW AND HIGH CARBON STEELS
Abstract:
A weld (6, 26) joins a thin overlay (4) of low carbon steel to a base (2) that contains high carbon steel, at least at its surface along which the weld is formed. The weld may be effected by fusion (melting) or by solid-state diffusion. With either it creates a heat affected zone (HAZ) (18, 30) in the base around the weld. The HAZ contains enough austenite, and perhaps bainite as well, to render the HAZ relatively ductile and also crack resistant. Adjacent to the weld the HAZ has a hardness that does not exceed 58 HRC. The weld may be produced with a high energy beam or with resistance welding equipment.