Abstract
In this work the results of welding the pipes from low-carbon steel St 35.8 (Č.1214, DIN17175, W.Nr. 1.0305, EN-P235GH) by TIG procedure were shown. After welding, the microstructure analysis by means of optical microscope was performed. Microstructural analysis out on the base material, heat affected zone and melting zone was carried. It was found that the base material has ferrite-pearlite microstructure with hardness 148 HV10, while in the heat affected zone is present ferrite-pearlite microstructure with Widmanstatten ferrite in some places with hardness 176 HV10. A cast microstructure consisting of ferrite and bainite was observed in the melting zone with hardness 228.7 HV10.
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