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Shot peening is a method of cold working in which compressive stresses are induced in the exposed surface layers of metallic parts by the impingement of a stream of shot, directed at the metal surface at high velocity under controlled conditions. This article focuses on the major variables, applications, and limitations of shot peening and provides information on peening action, surface coverage, and peening intensity. It discusses the equipment used for shot recycling and shot propelling as well as the types and sizes of media used for peening. The article describes the problems in shot peening of production parts. It concludes with information on the SAE standard J442 that describes the test strips, strip holder, and gage used in measuring shot peening intensity.

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