Welding is a generic term applied to join metal parts, by different processes, based on the principle to transform connection surfaces in semi-liquid or liquid state, using heat or pressure, or both simultaneously. Welding works are performed frequently in industry and professional workshops, and these operations represent huge occurrence of accidents and fires. For welding works with high level of safety is necessary to know the dangers, as well as the precautions that must be taken to prevent accidents and injuries. Currently there are three direct sources of heat more common and different types of welding.
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