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US 3,942,705 AGranted
Protection for aluminum tubing during ultrasonic soldering
AssigneeGeneral Electric Company
InventorMichael R. Barbay
Life of this patent
Estimating the term…
Abstract
The method of preventing surface erosion of a preselected portion of aluminum tubing during the ultrasonic soldering of a joint in another portion of the tubing. The preselected portion of tubing to be protected is coated prior to its being subjected to the ultrasonic soldering step so that the solder and its deoxidation action does not contact the aluminum surface of the preselected portion of the tube.
Claims3
The method of soldering a joint of an aluminum tubing assembly in a molten solder bath that is subjected to ultrasonic energy source comprising:
- immersing the tubing assembly in said bath so that said joint is in an area having a preselected level of solder cavitation sufficient to scrub surface oxide from said joint to cause the solder to adhere to said surface to seal said joint before surface erosion of said surface takes place;
- coating a portion of said tubing assembly prior to said immersing of the tube assembly with a layer of tin plating so that the surface area of said portion when in an area having a greater level of solder cavitation than said preselected level is protected from erosion damage in said area having a greater level of solder cavitation during the scrubbing and soldering of said joint in said preselected level.
Dependencies are inferred from the claim text.