Method for controlling weld metal microstructure using...

Details Method for controlling weld metal microstructure using... Method for controlling weld metal microstructure using...

2008-01-10

2009-06-02

King, Roy (Department: 1793)

Metal fusion bonding

Process

Plural heat applying

C148S590000, C148S639000

Reexamination Certificate

active

07540402

ABSTRACT:
The present invention provides a method for welding and heat-treating seam-welded constructions of hardenable steel and ferrous alloys with reduced weld-zone hardness and improved weld-zone ductility and toughness. This method consists of controlling the cooling rate of the seam weld with a secondary heat source, applied after the weld cools below the materials upper critical temperature (AC3), but prior to the weld cooling to ambient temperature. This invention is particularly suited to the production of high strength hardenable alloy seam-welded pipe and tubing.

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