Metal fusion bonding – Process – Using high frequency vibratory energy
Patent
1974-11-11
1976-04-27
Smith, Al Lawrence
Metal fusion bonding
Process
Using high frequency vibratory energy
228 1, 228147, B23K 106
Patent
active
039529371
ABSTRACT:
A method and apparatus for ultrasonically welding the overlapped portions of a continuous metal strip that has been rolled about a longitudinal axis to form a tubular product. The metal strip is rolled around the outer surface of an internal mandrel by means of one or more forming tools disposed around the mandrel. At the exit end of the forming tool, a stationary, rigid, non-resonant anvil is formed by a portion of the outer surface of the mandrel so that the anvil is located inside the rolled metal strip and supported by that portion of the mandrel which extends outwardly between the longitudinal edges of the strip upstream of the point where the strip edges are brought together. As the rolled metal strip is advanced, the longitudinal edges thereof are overlapped and passed over the anvil. The outermost surface of the overlapped edge portions is engaged with a non-traversing ultrasonic welding disc which presses the overlapped edge portions against the anvil while vibrating at an ultrasonic frequency in a direction transverse to the direction of advancement of the rolled metal strip. The supporting surface of the anvil is preferably relieved in a pattern that is oriented in the direction of movement of the strip, such as by machining the anvil surface to form a series of parallel, machine direction grooves to minimize friction between the strip and the anvil in the machine direction while providing a large amount of friction between the strip and the anvil in the direction of vibration of the welding disc. The welding disc is continuously rotated with the working peripheral surface of the disc moving in the direction of advancement of the metal strip and substantially the same velocity so as to avoid any friction between the strip and the disc in the machine direction.
REFERENCES:
patent: 3360850 (1968-01-01), Avila
Jones James Byron
Lamons Robert P.
Andrew Corporation
Joyce Margaret
Smith Al Lawrence
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