ON THE STRENGTH OF THE COMPOUNDS, PREPARED BY PROJECTION WELDING WITHOUT FORMING A MOLTEN CORE

Abstract

The results of the study of the projection welding. The variants of sequential dosing step input in the electrode area of electric power by setting a two-stage pulse welding current in conjunction with an application to the welding zone of high forging efforts after turning off the power. When welding critical structures for strength joints molten core of the desired diameter can be obtained by typing in the electrode area of electric power, reduced to eight to ten times compared with the calculated value of the heat balance equation, but the welding current at the second stage pulse should not be lower than estimated. When welding irresponsible designs perceiving low operating load, in conjunction instead of molten core may be prepared by solid ring without melting from the grasp of the perimeter by reducing the rated current of the two-stage pulse of up to two times. Whatever the nature of the input electrical energy in the electrode area increasing clamping force of the electrodes on recommended literature values in all cases leads to a decrease in bond strength due to the lack in the welding zone molten core or solid ring, and the presence of the other two zones – the activation zone and the zone setting metal parts to be welded.