Study on Welding Condtions for Steel by Friction Welding

Abstract

Many reports have recently been made concerning to friction welding, however we seldom find reports about influences which each factor of that welding gives to material. That's why we have conducted how the basic factors of friction welding, which means heating pressure, forging pressure, revolution speed, material diameter, surface circumstance and so on, have an effect on weld joint. Our results are as follows :
(1) When heating pressure and forging pressure are high and their proportion is large, excellent weld joint can be made irrespective of small upset, however such an effect is rather doubtful when the proportion goes over a certain figure.
(2) Revolution speed does not affect so much upon joint, but the speed should be decided, considering production efficiency, as upset speed depends on its material. Influence on weld material diameter, depends on sliding speed as well as revolution speed, and when material diameter is big, revolution speed should be low.
(3) Surface circumstances of material to be welded effect upon early calorification conditions on welding process and the minimum upset becomes bigger, which is not broken on weld interface, on bad surface circumstances.