Vibratory Stress Relief , often abbreviated VSR, is a non-thermal stress relief method used by the metal working industry to enhance the dimensional stability and mechanical integrity of castings , forgings , and welded components, chiefly for two categories of these metal workpieces:. These stresses are called residual stresses ,  because they reside within the metal workpiece. Residual stresses are caused by rapid, unequal cooling as opposed to the stresses caused by external loading. This unequal cooling occurs during welding, casting, forging, rough machining or hot rolling. These stresses often lead to distortion or warping of the structure during machining, assembly, testing, transport, field-use or over time.
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