FIELD: heat exchange.;SUBSTANCE: present invention relates to a method for connection of tubes (125) of a shell-and-tube heat exchanger to pipe grid (130) of said heat exchanger, in which tubes (125) are cohesively connected to tube grid (130) by means of laser welding, in process of which laser beam (211) is generated and focused in a place intended for welding, on connecting section (250) between tube (125) and tube grid (130), wherein laser beam (211) is moved so that it performs first movement along connecting portion (250) and second movement combined with first movement, which differs from first movement, wherein the second movement in a predetermined manner affects the melting bath dynamics and/or in a predetermined manner converts the formed steam capillary.;EFFECT: disclosed is a method for connection of tubes of a shell-and-tube heat exchanger to a pipe grid of a shell-and-tube heat exchanger.;15 cl, 9 dwg
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