Method of flash butt welding

Details Method of flash butt welding Method of flash butt welding

B - Operations, Transporting

23

K

327/59

B23K 11/04 (2006.01)

Patent

CA 1182870

METHOD OF FLASH BUTT WELDING Abstract of the Disclosure In the course of flash butt welding of two parts, there are caused to continuously approach each other and the ends of the parts are fused by an alternating current. During the approach, an oscillatory motion along the direc- tion of approach is imparted to one of the parts, thereby additional relative movements of the parts towards and away from each other are accomplished. The invention consists in that the welding voltage is reduced to within the range of 0.7 to 0 of its working value during the stage of a rela- tive movement of the parts being welded together away from each other and is restored during the stage of a rela- tive movement of the parts towards each other, reducing the voltage being carried out in a time interval of not less than 1/8 of the period of the oscillatory motion from the beginning of the relative movement of the parts away from each other, and restoring it, in a time interval of not more than 1/8 of the period of the oscillatory motion from the beginning of the relative movement of the parts towards each other. The voltage may be reduced to within the same range for the periods when the resistance across contacts exceeds a predetermined value. The method of the invention is useful for welding together parts with both simple and complex cross sectional shape.

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