pöördkehade hõõrdkeevitusprotsess, mille korral üks detail pöörleb püsiva kiirusega, teine on paigal; liitekohas vajaliku temperatuuri saavutamisel pöördliikumine pidurdatakse ja detailid surutakse keevitumiseks kokku, friction stir welding technique in which one part is driven at a constant rotational speed and forced into contact with the stationary part at a certain force level so that friction heat is generated at the interface; when the proper hot working temperature has been reached, braking is applied to stop rotation and simultaneously the pieces are forced together at forging pressures