PL155383B1 - Pulse welding attachment - Google Patents

Description

REPUBLIC PATENT DESCRIPTION 155 383 POLAND Additional patent to patent no. --- Int. Cl. ⁵ B23K 9/09 Reported: 87 12 30 (P. 269887) Priority - READING and go uh OFFICE PATENT Application announced: 89 07 10 RP Patent description published: 1992 01 31

Creators of the invention: Andrzej Bobrowicz, Stanisław Krasicki

The holder of the patent: Szczecin University of Technology,

Szczecin (Poland)

ATTACHMENT 00 PULSE WELDING

The subject of the invention is a pulse welding suction cup that can cooperate with any existing DC welder.

There are known and used power sources for pulse welding based on systems with transistors and thyristors controlled by a timer. They are tightly connected to a specific welding current source, skms'tuoww ^ n; ^ m for pulse welding. These devices are expensive and difficult to obtain.

The device according to the invention connected to the main welding circuit is characterized by the fact that it comprises a stabilized power supply powered from the main circuit by a diode, shunted by a capacitor, the voltages of which are fed to the voltage converter and the time block. The voltage converter is powered by the main circuit and receives the signal from the timer.

The main circuit includes a series setting resistor and parallel to it a first thyristor controlled by a timer. The cathode of the first thyristor is connected through the coil to the cathode of the second thyristor, the anode of which is connected through a commutation capacitor to the negative pole of the welding power source. The common point of the second thyristor and the commutating capacitor is connected to the voltage converter. The second thyristor is also timer controlled.

The advantage of the attachment according to the invention is the possibility of using pulse welding from any existing welding power source with a traditional welding method.

The subject of the invention is shown in the example in the drawing showing the schematic and bioc diagram of the adapter.

Welding power source 1 powered by Japan of R.S.T. with a terminating resistor ™ R, the welding current is connected to the main circuit 7 with the pick-up. A stabilized power supply 6 is supplied from the main circuit 7 via the diode D, which is shunted by the condensate C1. The stabilized power supply 6 supplies voltage to the voltage converter 2 and time block 3. The converter

155 383

155 3.33 of voltage 2 is supplied from the main circuit 7 and is connected to the common point of the commutation capacitor C and the second thyristor TY2 connected with its anode through the coil L with the setting resistor R1 connected in parallel and the first thyristor TY1 connected to the main circuit (7). The first and second thyristors TY1 and TY2 are controlled by timer 3 which includes a pulse resistor Rti and a break resistor Rtp. At the outlet from the attachment, an electrode 4 is connected to the main circuit 7, welding the workpiece 5.

The adapter operates in such a way that, when the power is turned on, the voltage converter 2 charges the commutation capacitor C to a voltage higher than that present at the terminals of the welding power source 1. The stabilized power supply 6 supplies all voltages to power the electronics of the adapter. Diode D prevents the discharge of the capacitor Cl during welding. After the electrode 4 is shorted with the workpiece 5 and the arc is initiated, the welding current flows in the circuit: welding current source 1, setting resistor R1, electrode 4, workpiece 5. Setting resistor R1 sets the base current. After switching on the first thyristor TY1, the so-called impulse current flows in the welding circuit, the value of which is determined by the setting resistor R. The impulse from time block 3, switching on the second thyristor TY2, simultaneously causes the blockade of the voltage converter 2. The cathode of the first thyristor TY1 appears higher voltage than at its anode. The second thyristor TY2 goes into valve operation. The L coil limits the steepness of the rise of the current flowing from the commutation capacitor C through the second thyristor TY2. Then the welding circuit current drops to the base current value. After the time necessary to switch off the first thyristor TY1 and after the loss of current in the second thyristor TY2 has elapsed, the voltage converter 2 is unlocked, charging the commutation capacitor C for the next switching cycle. Pulse resistor Rti in timer 3 adjusts the pulse duration and the pause resistor Rtp controls the duration of the pulse pause.

Claims (1)

Patent claim Attachment for pulse welding with thyristors controlled by a timer, characterized by the fact that it includes a stabilized power supply (6) shunted by a capacitor (Cl) powered from the main circuit (7) through a diode (D), the voltage of which is supplied to the voltage converter (2) and a timer (3), the voltage converter (2) is powered from the main circuit (7) and receives signals from the timer (3), and to the parallel connected setting resistor (R1) and the first thyristor (TY1) is connected through the coil ( L) second thyristor (TY2) and commutation capacitor (C), the common point of which is connected to the voltage converter Department of Publishing of the UP RP. Circulation 100 copies Price: PLN 3,000