Appeal No. 1999-1818 Page 4
Application No. 08/586,806
supplying an electric current between said rod body and said steel ball to perform an
electric resistance welding of said rod body and said steel ball to each other;
wherein a pipe material formed of an aluminum-magnesium-silicon based alloy is used
as said rod body, a welding current I is set in a range of 18,000 # I # 21,000 amperes, a
pressing force P is set in a range of 350 kilogram-force # P # 400 kilogram force and a
current supplying time t is set in a range of t < 2 cycle; and
bonding said rod body and said steel ball together by utilizing biting-in portions of the
rod body into the steel ball and an aluminum layer formed on a surface of the steel ball by a
liquid phase generated from the rod body during the welding.
Macura discloses a push rod employed to transmit mechanical force from the tappets to
the rocker arms in an internal combustion engine (column 1, lines 15-18) comprising a Bundy
tubing (copper plated steel strip rolled into a tube) body 10 having a steel bearing ball 11
securely and rapidly welded at each end by resistance welding. The welding is performed by
forcing the bearing ball against the body 10 with a pressure of 450 pounds, applying a current
of 12,000 amperes for 6 cycles and maintaining the pressure for one second thereafter to3
insure "quick cooling" which preserves the original hardness of the ball in the areas remote
from the weld (column 1, line 43, to column 2, line 6). The Macura push rod is intended to
reduce the weight of the valve train without any substantial increase in cost or sacrifice of
operating characteristics (column 1, lines 22-27).
3Macura does not specify the frequency or the duration of a cycle.
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