Patent UA-101534-C2 (UA)
Title: Method and device for arc welding with non-consumable electrode
Inventor: PATON BORYS YEVHENOVYCH
IPC: B23K9/10
Filed: 2011-06-14
Abstract: (57E) The invention relates to the field of gas-shielded arc welding, namely to the equipment for automatic gas-shielded welding with a non-consumable electrode. Disclose is a method of arc welding with a non-consumable electrode, according to which in the event of disturbances of the arc voltage its stabilization relative to the programmed values is carried out by automatic control of the spatial position of a non-consumable electrode relative to the surface of an article to be welded, wherein before welding process a short circuit of the arc gap is performed followed by measurement of the short-circuit current, by a computing device the active resistanceof the welding circuit is determined, then the resulting value of the welding circuit is introduced into the device's memory, that allows the calculation of the current values of the voltage dropin the welding circuit depending on the current values of the welding current and during welding the current values of arc voltageaccording to the expression, where- current value of the voltage at the output of the welding current is compared with its pre-programmed values. A device for arc welding with a non-consumable electrode consists of a welding power source, an adder, a unit for forming an arc voltage set point, a voltage error amplifier, a power amplifier, an actuating motor with a reduction gear and a mechanism of vertical movement of the torch with non-consumable electrode, while one of the output terminals of the welding power supply is connected to the non-consumable electrode, and the other output terminal - to an article to be welded, one of the inputs of an adder is connected to the unit for forming an arc voltage set point , the output of the adder is connected to the voltage error amplifier, the output of which is connected to the signal input of the power amplifier, the output of power amplifier is connected to the actuator motor with a reduction gear cinematically connected to the mechanism of vertical movement of the torch with the non-consumable electrode, an auxiliary precision voltage source, a setter of test current and a computing device that comprises at least units of division, quotient memory, multiplication and subtraction of two values, while one output pole of the auxiliary output precision voltage source through a sensor of test current is connected to the output terminal of the same name of the welding power source, the other pole of the auxiliary output precision voltage source - to the other output pole of the same name of the welding power source, one data input of the computing device is connected to the output of the auxiliary precision voltage source, the second data input - to the data output of the sensor of test current, the third data input – to the output of the unit for forming proportional welding current of the signal of the control unit of welding power unit, the fourth data input – to the output of welding power source, the analog output of the computing device is connected to the second input of the adder. Thus the improvement of quality and performance of the weld due to simplify and improvement of the accuracy of measurement of current values of arc voltage at the output of the welding power source are achieved.