Metal fusion bonding – Process – Repairing – restoring – or renewing product for reuse
Patent
1988-07-28
1990-01-30
Seidel, Richard K.
Metal fusion bonding
Process
Repairing, restoring, or renewing product for reuse
228165, 228226, 228215, 228216, 2940207, 2940212, 2940213, 219 7612, B23K 902, B23K 904, B23K 9225, B23K 3706
Patent
active
048968145
ABSTRACT:
A method of welding in a groove (1) machined in a solid alloyed steel part, characterized in that bottom passes (2) are performed and then each wall (11, 13) of the groove (1) is faced with low alloy steel filler material, heat treatment is performed so as to eliminate the stresses in the zones (18, 19) of the part adjacent to the walls (11, 13) of the groove, and the empty space (20) between the two facing layers (15, 17) is filled with low alloy steel filler materials, said operation of facing the wall (11, 13) being performed by placing a carbon steel plate (4, 4', 2, 22') in the groove (1) at a certain distance from said wall (13, 11), by filling the space (12, 16) between the plate (4, 4', 22, 22') and the wall (11, 13) with layers (14, 14') of low alloy steel having a carbon content lying in the range 0.08% and 0.12%, and by getting rid of the steel plate (4, 4', 22, 22') and optionally a portion of the fill so as to leave only a layer (15, 17) on the wall (13, 11). The method can be used to get rid of a defect in a part while greatly reducing the risks of cracking.
REFERENCES:
patent: 3745322 (1973-07-01), Ito et al.
patent: 3746833 (1973-07-01), Ujiie
patent: 4208003 (1980-06-01), Meylan
Welding Production, No. 10, Oct. 1986, Abington, Cambridge (GB), pp. 13-15.
Allain Gilles
Nougaret Max
Heinrich Samuel M.
Seidel Richard K.
Societe Anonyme dite: ALSTHOM
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