Cold Welding

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cold welding

[′kōld ‚weld·iŋ]
(metallurgy)
Welding in which a molecular bond is obtained by a cold flow of metal under extremely high pressures, without heat; widely used for sealing transistors and quartz crystal holders.

Cold Welding

 

a method of welding metals without heating by pressing together the parts to be joined. It is usually done at room temperature and at high pressures—up to 1 giganewton per m2 (104 kg-force per cm2) or more—that produce plastic flow in the metals. Cold welding is a highly productive and economic process; it is especially suitable for plastic materials (plastics and resins) and metals having a cubic, face-centered, crystal lattice, such as aluminum, copper, nickel, silver, and iron (γ-Fe). The most common application is the cold welding of aluminum and of aluminum with dissimilar metals, such as aluminum with copper; the technique makes it possible to avoid the formation of brittle, low-strength intermetallic compounds at the site of the weld, which occur with normal fusion welding. Cold welding is extensively used in electrical engineering, the aviation industry, and elsewhere.

REFERENCE

Baranov, I. B. Kholodnaia svarka plastichnykh metallov, 3rd ed. Leningrad, 1969.

cold welding

The joining of metals (such as aluminum) at room temperature by subjecting thoroughly cleaned metal surfaces to pressure; coalescence is produced solely by the application of mechanical force.
References in periodicals archive ?
The difference in appearance near the cold weld on the metallic mold-in-color PP has been investigated in relation to the angle subtended by the Al flakes adjacent to the molding surface (7).
has made a major breakthrough in a new application of Ultrasonic Time of Flight Diffraction (UT-TOFD) that enhances ultrason-examination of thermoplastic, pipeline butt welds Tire capability 10 non-destructively characterize, evaluate weld integrity, and detect defects, including porosity and lack of fusion (LOF) or cold welds of plastic pipe in operation, was needed by industry, but not previously available.
They conclude for cold weld lines in PS that this V-notch effect is more important than the real V-notch on the weld line surface, which might arise because of entrapped air or contaminants.
Typical values are 50% for cold weld lines and 75% for hot, compared with the values of the bulk (2, 7, 11).
Though any of the high impact bonding materials such as Brownells Steel Bed or similar cold weld product would serve nicely to permanently bond the cartridge ramp, I used J-B Weld.