Abstract
Use of welding technology for the repair of steel castings is particularly common in two areas. These include weld surfacing of protrusions
that remained incomplete after casting, or filling the surface defects (cavities). These defects are more common for steel casting than for
graphite cast iron, due to the lower fluidity of steel. This article describes a suitable technological process of repairing the defects on the
casting using the welding technology. A specimen produced for this purpose was prepared by carving a groove into a cast steel plate 20
GL, which was then filled with a weld metal using MAG (135) technology. The following evaluation of the basic characteristics of the
repaired site point to the suitability of the selected technological parameters of the repair procedure. Metallographic evaluation was carried
out, further evaluation of mechanical properties by tensile test, bend test and Vickers hardness test. The proposed methodology for the
evaluation repair of foundry defects in steel castings also meets the requirements for the approval of welding procedures in accordance
with the relevant valid legislation.
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