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 ?
A decrease in the number of [beta]-form spherulites was detected at the cold weld line (13), and the generation of [beta]-form spherulites increased at the mold temperature of 100[degrees]C as compared with that at 40[degrees]C (14).
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.
8) for the poorly bonded layer of cold weld lines PS.
Provided with one gate on each side, a cold weld line could be produced almost at the center of the specimens.
The flexural tests on cold weld lines were in some cases supplemented by impact testing.
Tables 1 through 5 summarize results from flexural strength measurements along the flow direction and at the cold weld line for the five materials, using 16 different parameter settings.
Results are taken from parameter settings that gave low WL-factors for the cold weld [since these settings tend to give low WL-factors for the hot welds as well (7)].
67 is obtained close to the gate, approximating what was obtained for the cold weld (0.
77, were obtained for cold weld lines in glass fiber-reinforced and talc-filled materials.