Welding material for use in hard-facing and method of determinin

Details Welding material for use in hard-facing and method of determinin Welding material for use in hard-facing and method of determinin

1996-12-23

1998-06-23

Heinrich, Samuel M.

Metal fusion bonding

Process

With subsequent treating other than heating of bonded parts...

2282624, 228103, 219137WM, 148529, B23K 3532, B23K 923, C21D 118

Patent

active

057693080

ABSTRACT:
The composition of a hard-facing welding material to be overlaid onto a cast iron base metal followed by a supercooling treatment for hardening must lie above a line LA in a Schaeffler's structure diagram which is represented by a Cr equivalent and a Ni equivalent. On the other hand, if the base metal is preheated, the carbon precipitation line will be at the Ni equivalent of 34 (LC1), and the Cr equivalent will thus be above 4. However, if the Cr equivalent is above 4, there will occur cracks after welding (examples in which cracks occurred are shown by square marks represented by a in FIG. 1). As a solution, the carbon precipitation line was raised up to the Ni equivalent of 38 without preheating the base metal, and the Cr equivalent of the welding material was made to be 4 or less.

REFERENCES:
patent: 5361968 (1994-11-01), Tanaka et al.
patent: 5622573 (1997-04-01), Ikeda et al.

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