Electric heating – Metal heating – For bonding with pressure
Patent
1993-02-08
1994-10-04
Evans, Geoffrey S.
Electric heating
Metal heating
For bonding with pressure
53403, 280736, B23K 1100, B65B 3102, F16F 943, F17C 506
Patent
active
053528603
ABSTRACT:
A method and apparatus for supplying an inert gas under extreme pressure to a weldable air bag canister having a gas-charging opening in one end wall, and weld sealing the opening. The canister, and a composite welding head and weld ball supplying assembly, having a lower nose with a seal surrounding a ball dispensing opening therein, are relatively moved axially to seal off the opening in the canister end wall. Then, prior to pressurizing the assembly, an individual ball is presupplied through a passageway seal system to a ball delivery member inboard of the seals which are provided in the welding head and weld ball supplying assembly. Thereafter, the composite assembly is charged with gas under a heavy pressure measured in thousands of pounds per square inch, and a raiseable and lowerable welding electrode, carried by the assembly axially in alignment with the ball receiving chamber and ball dispensing opening, delivers welding current to melt collapse the ball to seal the opening. Finally, the electrode is moved back to retracted position and the assembly is depressurized.
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Evans Geoffrey S.
RWC Inc.
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