ME364_combining_solid - 160 Solid-state Welding Valery...

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Solid-state Welding 160 Valery Marinov, Manufacturing Technology 8.3 SOLID-STATE WELDING The solid-state welding group includes the oldest joining process as well as some of the most modern Forge Welding Forge welding is a welding process in which the components to be joined are heated to hot working temperatures and then forged together by hammer or other means. Woodcut showing a large ship’s anchor being forged in 18th century France. The arm and the shaft of the anchor are being forge-welded together in this view. Considerable skill was required by the craftsmen who practiced it to achieve a good weld. The process is of historic signi±cance in the development of manufacturing technology; however, it is of minor commercial importance today. Cold Roll Welding Cold roll welding is a solid-state welding process accomplished by applying high pressure by means of rolls between clean contacting surfaces at room temperature: Metals to be welded must be very ductile and free of work hardening. Contact surfaces must be exceptionally clean. Metals such as soft aluminum, copper, gold and silver can be readily cold-welded. For small parts, the forces may be applied by simple hand- operated tools. For heavier work, powered presses are required to exert the necessary force. Applications of cold welding include cladding stainless steel to
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ME364_combining_solid - 160 Solid-state Welding Valery...

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