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Cross-section of cold welding – before and after the weld. Cold welding or contact welding is a solid-state welding process in which joining takes place without fusion or heating at the interface of the two parts to be welded. Unlike in fusion welding, no liquid or molten phase is present in the joint. Cold welding was first recognized as a ...
Cold metal transfer (CMT) is a welding method that is usually performed by a welding robot. The CMT machine detects a short circuit which sends a signal that retracts the welding filler material, giving the weld time to cool before each drop is placed. This leaves a smooth weld that is stronger than that of a hotter weld.
Overhead stick welding. Welding is a fabrication process that joins materials, usually metals or thermoplastics, primarily by using high temperature to melt the parts together and allow them to cool, causing fusion.
(a) Explain that Wikipedia's definition of cold welding in space is not the definition used by subject matter experts like the ESA, and (b) that the ESA has published an academic report explaining the difficulty in preventing what it considers to be cold welding in space. The ESA report is currently footnote 4:
Using a high energy mill to favor plastic deformation required for cold welding and reduce the process times; Using a mixture of elemental and master alloy powders (the latter to reduce the activity of the element, since it is known that the activity in an alloy or a compound could be orders of magnitude less than in a pure metal)
Vacuum cementing or vacuum welding is the natural process of solidifying small objects in a hard vacuum. [ clarification needed ] The most notable example is dust on the surface of the Moon . This effect was reported to be a problem with the first American and Soviet satellites, as small moving parts would seize together.
As a cold repair process, metal stitching is applicable where heat should not be used, and in situations where the material cannot be successfully repaired by welding. Situations where application of heat would be problematic are particularly appropriate for cold metal stitching, examples include: oil installations and engine rooms. Often large ...
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