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Friction Welding Report

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Initial attempts, by Amontons and Coulomb among others, assumed that mechanical interlocking between rigid or elastically deforming asperities are responsible for the frictional force and the consequent mechanical wear and heat generation. This model assumes two bodies which perform both longitudinal and transverse motion at the same time; work is performed by normal load after the upper body has returned to its lowest position, and all of the potential energy is recovered. Unfortunately, macroscopic observations may not be in agreement with this theory as highly polished and smooth surfaces are necessary for cold welding and do not necessarily show low friction. An additional problem for this theory, is that adsorbed films change friction …show more content…

Dissimilar material combinations and cast to forged components.
Difficult to weld, heat resisting alloys. Joining single crystal nickel alloys to polycrystalline alloys.

However, to increase greatly the application of LFW in industries such as automotive and power generation, the cost of linear friction welding machines must be drastically reduced. An EU funded study has recently been completed to build a low cost LFW machine. This increases TWI's capability to two machines. The newer machine (Linfric) is designed to enable welds to be made on large structures. Ellis(1977)examined the relationships between “friction time-workpiece diameter”, “shortening-upsetting pressure” and “carbon equivalent-hardness variation”. Ishibashi et al. (1983)selected stainless steel and high-speed steel as representative materials with an appreciably difficult weldability, and obtained their suitable welding conditions. In their work, distributions of alloying elements at and near the weld interfaces for joints of sufficient strength were analyzed using an X-ray micro-analyzer. Murti and Sundaresan (1983) directed a study about parameter optimization in friction welding of dissimilar materials. Dunkerton (1986) investigated the effects of rotation speed, friction pressure and upsetting pressure in all friction welding methods for steel. Y.lbas et al. (1995) investigated the mechanical and metallurgical properties of friction welded steel-aluminum and aluminum-copper bars. Y.lmaz (1993) investigated hardness variations and microstructures in the welding zone of welded dissimilar

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