LAUSR

For the first time the range of values has been determined experimentally of the absolute contact heat resistance in the zone of the threaded joint of two parts of cylindrical form from aluminum alloy with a thread length exceeding its diameter by a factor of more than 3 with the transferred heat flux varied over the range from 4.5 to 78.5 W. It has been shown that the contact heat resistance is influenced by the value of the transferred heat flux, the presence of a heat conducting medium in the contact zone, and the conditions of tightening the thread for contact heat resistance. It has been established that in a threaded joint of length 53 mm having a diameter of 14 mm and a thread pitch of 0.5 mm without using a heat conducting medium in the contact zone, as the heat flux increases from 4.5 to 78.5 W, the value of the contact heat resistance without tightening of the thread decreases from 0.35 to 0.18oC/W. Tightening of the thread up to the stop leads to an insignifi cant decrease in the value of the contact heat resistance. At the same time the injection into the contact zone of the threaded joint of the heat conducting paste KPT-8 decreases the heat resistance of the contact by a factor of 2.2 at the minimal transferred heat flux (4.5 W) and by a factor of 1.6 at the maximal heat flux (78.5 W).