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A New High-temperature Soft Solder System.
Schwaneke-AE; Falke-WL; Crosser-OK
NTIS: PB 196 675 :18 pages
A new high-temperature soft soldering system has been developed by the Bureau of Mines for use on copper, copper alloys, and low-carbon steel; the method is applicable to automobile radiators and home appliances. The system uses a unique sacrificial metal coating method to promote spontaneous wetting and spreading of zinc and zinc alloy solders on metallic substrates. The 10-5 to 10-6-cm-thick, electroplated or sputtered, sacrificial nickel coating is absorbed by the molten filler alloy during soldering and produces a direct solder-substrate metallic bond. Preliminary measurements on butt joints with copper members give tensile strenghts up to 22,000 psi at room temperature using 95 zn-5 al alloy as solder. Spontaneous wetting, spreading, and capillary penetration are extremely rapid and produce joints as easily as 50-50 tin-lead solders. Recrystallization or annealing of the wrought-copper joint members is negligible at the soldering temperatures of 450 deg. to 490 deg. C and lower. A list of fluxes and solder alloys is included in the report. (Out of print.)
NTIS Accession No.
NTIS: PB 196 675
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division