Abstract
S u m m a r y Results of investigation of MAG 22MnB5 steel welds have been presented. The influence of welding condition on mechanical properties and microstructural characteristic of pipe joints ∅90x3,6 have been presented. The tensile strength of welded joints are slightly lower than that of the base material. The maximum hardness in the heat affected zone (HAZ) without preheating exceed 380HV10, simultaneously preheating up to 350°C caused decrease in the hardness to 266HV10. The microstructure of the weld is mainly composed of bainite and ferrite. In the HAZ bainite, ferrite and martensite are present. The results of technological welding trials and destructive examination of welds indicate that the MAG welding is a useful technology to join 22MnB5 pipes.
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