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Institute Elektrosvarki Imeni E.o. Patona Akademii Nauk Ukrainskoi Ssr

Institute Electrosvarki Im. Patona

Alexei I Gorishnyakov

Sergei I Kuchuk-Yatsenko

Valery G Krivenko

Mikhail V Bogorsky

Vadim P Krivonos

Ivan L Lazebny

Sergei M Samotryasov

Daniil I Belyaev

Alecsandr V Didkovskiy

Anatoly P Nizov

Mikhail V Bogorskiy

Valeriy G Krivenko

A method of flash-butt welding in which the travel speed (V,) of the machine mobile plate and the welding voltage (U,) are changed (by preset programs) and the travel speed is controlled through negative feedback by welding current, the voltage being changed discretely for each flashing fixed interval of t,duration as a function of the increment of the actual average speed of flashing details of shortening (V,) during the previous flashing interval, V,value being maintained at the present level, lower than V,. The invention envisages a change of the coefficient of enhancement of the negative feedback in a discrete manner for each preset flashing interval of t,duration as a function of V,increment during the previous flashing interval. The invention further provides for an increase in the value of U,and a decrease of the coefficient of negative feedback to the set value until the speed has reached the set value of speed V,at which upsetting is switched on, or after the set value of Q,has been reached, U,is increased and the coefficient of negative feedback is decreased to the set value, these values remaining constant until upsetting is switched on.

Method of flash-butt welding

The disclosed process includes the steps of and upsetting the flashing parts being welded. The flashing is conducted with concurrent measurement of useful electric power and an electric parameter of the flashing process which is related to the power by a function which maximizes the useful power at a predetermined value of said electric parameter. Then the value and sign of the power and parameter increments are determined within one and the same period of time. The parts are brought closer together up to the moment when the ratio of the power and parameter increments reverses ints sign. Then the parts begin to be separated up to the moment when the value of said ratio reaches the preset value selected to suit the welding circuit resistance and the cross sectional area of the welded parts.

Method for controlling a flash-butt resistance welding process

Control device for flash-butt resistance welding machine

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Kyiv, Ukraine

Alexei I Gorishnyakov