Abstract
The contribution deals with the mechanism of reheat and underbead cracking of welded joints of steels servicing at higher temperatures. The reheat and underbead cracking is the intergranular cracking due to the grain boundary sliding. The decisive factors controlling this type of cracking are the grain size and the degree of plastic deformation. In welding these can be reflected by the heat input and by the weld shape coefficient. The low silicon content has resulted in decrease of grain growth rate which is connected with recrystallization at higher heat inputs.

Key words
mechanism of reheat, underbead cracking, welded joints of steels, intergranular cracking

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