CN2360203Y

CN2360203Y - Argon arc welding machine with high pressure pulse arc striking function

Info

Publication number: CN2360203Y
Application number: CN 99200202
Authority: CN
Inventors: 肖波
Original assignee: TIME GROUP Inc
Current assignee: TIME GROUP Inc
Priority date: 1999-01-06
Filing date: 1999-01-06
Publication date: 2000-01-26
Anticipated expiration: 2009-01-06

Abstract

The utility model relates to an argon arc welding machine with high pressure pulse arc striking function. The argon arc welding machine comprises a coupling transformer, a discharging and arc striking circuit which is connected to a primary side winding of the coupling transformer, and a welding power circuit which is connected to an auxiliary side winding of the coupling transformer. A controlled silicon, a high voltage condenser, a logic control circuit, a trigger circuit, an inversion step-up circuit and a rectification circuit are connected to form the discharging and arc striking circuit. A direct current can be inversed into a 20KHz alternative current and is step up to 1000 V. The high voltage condenser is charged after the current is rectified. The logic circuit obtains discharging signals, and controlled silicon is triggered to make the high voltage condenser discharge. The coupling transformer makes the high voltage pulse coupled onto a welding major loop in order to carry out non-contact arc striking.

Description

Argon arc welding machine with high-voltage pulse thread-leading arc function

The utility model relates to a kind of inversion argon arc welding machine, relates to a kind of inversion argon arc welding machine with high-voltage pulse thread-leading arc function or rather.

Argon arc welding machine is connected to form by coupling transformer by source of welding current circuit and discharge arc ignition circuit two large divisions substantially, and source of welding current circuit provides welding the required energy, and the discharge arc ignition circuit provides the noncontact striking.By striking mode branch, argon arc welding machine noncontact striking mode is divided into high-frequency arc strike and power frequency high voltage pulse striking.

Fig. 1 is the principle schematic diagram of high-frequency arc strike argon arc welding machine, and the major defect of its structure is to need spark-discharge gap S.T1 in the discharge arc ignition circuit is a step-up transformer, usually 380V is exchanged and be elevated to 2000V to 3000V high pressure, C is a high-voltage capacitance, and T2 is a coupling transformer, and the high-frequency and high-voltage that it produces former limit is coupled to the welding machine major loop that is made of welding dc source 11, welding gun 12 and workpiece 13.Spark-discharge gap S is configured to by the tungsten bar or certain the propping up of copper rod outfit of two butt heads at a distance of 0.5-1mm usually, owing to be provided with spark-discharge gap S, make and have the open arc discharge in the discharge circuit of welding machine, cause more serious external radiation interference, not only disturb the electric equipment outside the welding machine, as cause computer corruption, and disturb other circuit in the welding machine, as cause welding machine control logic disorder etc.

Fig. 2 is the principle schematic diagram of power frequency high voltage pulse striking argon arc welding machine, the major defect of its structure be need be provided with that volume is big, Heavy Weight, duplex frequency boostering transformer that consumptive material is many.The T1 of discharge in the arc ignition circuit is duplex frequency boostering transformer, owing to be that 380V is exchanged the rectification again of directly boosting, thereby needs to adopt that volume is big, the transformer T1 of Heavy Weight.C is a high-voltage capacitance, and T2 is a coupling transformer, and SCR is a controllable silicon, by triggering the purpose that controllable silicon CT conducting reaches control high-voltage capacitance C discharge striking.

The purpose of this utility model is a kind of argon arc welding machine with high-voltage pulse thread-leading arc function of design, makes it both not have the high-frequency arc strike mode defective big to external radiation, can also improve the deficiency that adopts Industrial Frequency Transformer in the high-voltage pulse thread-leading arc mode.

The purpose of this utility model is to realize like this, a kind of argon arc welding machine with high-voltage pulse thread-leading arc function, comprise coupling transformer, the discharge arc ignition circuit that is connected with the former limit of coupling transformer winding with pay the source of welding current circuit that the limit winding is connected with coupling transformer, the discharge arc ignition circuit includes controllable silicon and high-voltage capacitance, it is characterized in that: described discharge arc ignition circuit also includes logic control circuit, circuits for triggering, inversion step-up circuit and rectification circuit, logic control circuit output connects circuits for triggering input and inversion step-up circuit input respectively, inversion step-up circuit output connects the rectification circuit input, and rectification circuit and circuits for triggering output connect described controllable silicon, the former limit of high-voltage capacitance and coupling transformer winding.

The discharge arc ignition circuit of the utility model high-voltage pulse thread-leading arc device, adopt chopper circuit earlier dc inversion to be interchange, again through boosting, give after the rectification high-voltage capacitor charging, logic circuit control provides discharge signal, and this discharge signal makes the high-voltage capacitance discharge by the conducting of circuits for triggering control controllable silicon, boost through coupling transformer again, high-voltage pulse is coupled to source of welding current circuit, and promptly the welding machine major loop just can carry out contactless striking.

Inversion argon arc welding machine with high-voltage pulse thread-leading arc function of the present utility model is compared with the high-frequency arc strike mode, and no open arc discharge is the non-contact work mode, and is minimum to external radiation, less to the interference of other circuit, also less to the electromagnetic interference that the space produces; Compare with power frequency high voltage pulse striking, no industrial frequency transformer does not have direct relation with line voltage, thereby volume, weight are all less, have reduced cost.

Further specify technology of the present utility model below in conjunction with embodiment and accompanying drawing.

Fig. 1 is the theory diagram of high-frequency arc strike mode welding machine

Fig. 2 is the theory diagram of power frequency high voltage pulse striking mode welding machine

Fig. 3 is the argon arc welding machine theory diagram with high-voltage pulse thread-leading arc function

Fig. 4 is the enforcement circuit diagram of discharge arc ignition circuit among Fig. 3

Address before the explanation of Fig. 1 and Fig. 2, repeat no more.

Referring to Fig. 3, the argon arc welding machine with high-voltage pulse thread-leading arc function mainly comprises source of welding current circuit 1, discharge arc ignition circuit 2 and coupling transformer 3.Source of welding current circuit 1 connects the paying the limit winding of welding gun 4, workpiece 5 and coupling transformer 3 and constitutes the welding machine major loop.Source of welding current circuit 1 has the circuit structure identical with the power circuit of existing welding machine, comprises three-phase input circuit 101, current rectifying and wave filtering circuit 102, inverter 103, step-down rectifying circuit 104, filtering output circuit 105, current setting circuit 106, current feedback circuit 107, external characteristic control circuit 108, logic control circuit 109, pulsewidth modulation (PWM) control circuit 110 and arc ignition circuit 111.Become the less direct current of ripple behind the three-phase alternating current process rectifier bridge rectification that electrical network is imported, the capacitor filtering, through inverter circuit output high-frequency ac,, obtain the direct current that can be used for welding at output again through exporting rectifier bridge rectification, reactor filtering.Adopt inversion transformation technique, about reverse frequency 20KHZ, can reduce copper loss and iron loss greatly, reduce the volume of main transformer and reactor, thereby reduce the volume and the weight of welding machine, and help improving the efficient and the power factor of welding machine, remarkable energy saving effect is arranged, because operating frequency is beyond audio frequency, thereby greatly reduce noise pollution.

Discharge arc ignition circuit 2 mainly comprises logic control circuit 201, circuits for triggering 202, inversion step-up circuit 203, rectification circuit 204, controllable silicon SCR and high-voltage capacitance C, is connected with the former limit winding of coupling transformer 3.

In conjunction with referring to Fig. 4, the AC power of being introduced by connector CN1 is after rectifier bridge BR1, capacitor C 1 filtering, and three terminal regulator Q1 exports V _CCDirect current, embodiment are 16.3V.The time basis set U1 in blocks and peripheral circuit thereof connect and compose oscillator, the frequency of oscillation of embodiment is 21.5KHz, and dc inversion for exchanging, is boosted to 1000V through intermediate-frequency transformer T1 again and exchanges, and charges for after rectifier bridge BR2 rectification high-voltage capacitance C9 to C12.Introduce the signal (as arc welding gun switch) of control discharge by connector CN1, control transistor Q2 (being connected into oscillator), Q3 work, the output of Q3 is controlled U1 on the one hand and is made its failure of oscillations, coupling by transformer T2 triggers controllable silicon SCR 1 conducting on the other hand, make the high-voltage capacitance discharge, discharge current is connected to the former limit (not shown among Fig. 4) of coupling transformer 3 through connector CN2, after boosting high-voltage pulse is coupled in the source of welding current circuit of welding machine, carries out non-contacting striking.

The utility model is owing to technology such as employing inversions, and generator characteristic and dynamic characteristic all significantly are better than the welding machine of other type, have satisfied the requirement of welding procedure to a greater degree, provide reliable guarantee for obtaining quality weld.Through on argon arc welding machine, testing, can make the striking distance reach more than the 5mm arcing initiation success rate 100%.

Claims

1. argon arc welding machine with high-voltage pulse thread-leading arc function, comprise coupling transformer, the discharge arc ignition circuit that is connected with the former limit of coupling transformer winding with pay the source of welding current circuit that the limit winding is connected with coupling transformer, the discharge arc ignition circuit includes controllable silicon and high-voltage capacitance, it is characterized in that: described discharge arc ignition circuit also includes logic control circuit, circuits for triggering, inversion step-up circuit and rectification circuit, logic control circuit output connects circuits for triggering input and inversion step-up circuit input respectively, inversion step-up circuit output connects the rectification circuit input, and rectification circuit and circuits for triggering output connect described controllable silicon, the former limit of high-voltage capacitance and coupling transformer winding.