Electric heating – Metal heating – By arc
Reexamination Certificate
2011-06-28
2011-06-28
Elve, M. Alexandra (Department: 3742)
Electric heating
Metal heating
By arc
C219S121630, C219S121760
Reexamination Certificate
active
07968818
ABSTRACT:
An apparatus and method for welding strap connections between inner grid straps of a spacer grid using a laser tool, and a spacer grid manufactured by the same, in which the strap connections between the inner grid straps of the spacer grid are seam-welded continuously or intermittently using the laser tool, so that the structural strength of the spacer grid is increased, a spattering phenomenon, in which a welded material is spattered during welding, is reduced, and thermal deformation is reduced. Further, fine welding is possible, and thus the welded bead of each strap connection between the inner grid straps can have a small size, and the number of welding defects can be reduced. In addition, the flow resistance of a coolant is reduced, and thereby the pressure drop of the coolant can be reduced As a result, the load on a flow pump for the coolant can be reduced, and economic efficiency and safety can be improved.
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Kim Soo Sung
Song Kee Nam
Song Kun Woo
Bachman & LaPointe P.C.
Elve M. Alexandra
Korea Atomic Energy Research Institute
Korea Hydro & Nuclear Power Co., Ltd.
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