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 ?
Ball milling processing technique involves cold welding, fracturing and rewelding of powder particles, which has become an established technique for oxide dispersion strengthened materials and variety of metastable phases [2].
The patent comprises the following steps: introducing the coating material in sheet or foil form into the barrel; positioning the component in the weapon barrel so that a first face of the component is oriented toward the inner face of the barrel and a second face of the component is oriented away from the inner face of the barrel; using spacers to maintain an equidistant annular clearance between the inner face of the barrel and the component; providing the second face of the component with an explosive; and detonating the explosive for hurling the coating material of the component against the inner face of the barrel for effecting a cold welding between the coating material and the inner face of the barrel.
Tenders are invited for Work of arresting of oil leakages from various joints of transformers using cold welding technology at 500 MW stage-III, CSTPS,Chandrapur on as and when required basis.