By W. Sudnik
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Extra info for Arc Welding
A thermal balance of the IEA process revealed a larger thermal efficiency as compared to the 22 Arc Welding traditional use of the GMAW welding process. This increase is ascribed to the fact that the electric arc is not openly exposed to the atmosphere. Instead, it is established in a hidden fashion within the groove formed by the feeding plates, reducing thus heat losses. This characteristic of the IEA technique has outstanding repercussions on the microstructure and mechanical properties of the welds.
The paradigm of welding automation Since the beginning, welding is a process that depends on the welder skills. This relation is so direct that the classification, according to the application methods, is based on the degree of control of the activities related to welding that depends on the human interference. These application methods are classified as manual, semi-automatic, mechanized, automatic, robotic and with adaptive control, according to American Welding Society (AWS).
The high temperature of the liquid metal melts the parent materials, producing the welded joint. , 2002a, 2002b, 2003). ELECTRODE FEED METAL EL EC TR IC C AR H MELTED METAL MELTED BASE METAL (a) (b) Fig. 1. , 2007). The fusion process of the base material is carried out by means of a liquid diffusion process, similar that the shown in Fig. 2a, where the liquid material diffuses through the grain boundaries, because these are areas of lower melting point than the matrix of the grains. This phenomenon is favored due to segregation of impurities and alloying elements in metals of high purity and alloying elements in alloys, respectively.
Arc Welding by W. Sudnik