JPS59141374A - Pulse arc welding machine - Google Patents

Abstract

PURPOSE:To make the constitution of a titled welding machine simple, small in size and inexpensive and to decrease the ripple component of base current by operating respectively adequately the base and pulse current controlling part of plural switching circuits provided in parallel between a power source and a welding load. CONSTITUTION:Transistors Qx, Qy are alternately turned on by a control means for base current in a control part 20 and the increased current from the emitters thereof flows via a reactor 18 to the welding load formed of a welding wire 8 and a base material 10, in the stage of supplying base current. When the Tr Qx or Qy is turned off, the current generated by the energy accumulated in the reactor 18 flows cyclically through the current load and a diode 19 while said current is decreased. The TRs Qx and Qy are simultaneously turned on and when the TRs are off, the current by the reactor 18 flows cyclically in the stage of supplying pulse current. The switching frequency for the base current is the composite frequency of both switching circuits 16, 17 and therefore the reduction in a ripple component is made possible in the stage of supplying the base current.

Description

Detailed Description of the Invention This invention relates to a pulse arc welding machine that alternately supplies a base current and a pulsed current to a welding load. The objective is to reduce the pulse component of the base current at a low cost.

Conventionally, when performing pulsed r-reweling, a base current and a pulsed flow of a larger flow than the current are alternately supplied to the welding load formed by the welding wire and the base metal, and the pinch force of the pulsed current is used to Melting of welding wire; sister life; filler line 1
/- shaped small particles and can be released from the wire at high speed.

Pulsed arc welding therefore has fine points in which the generation of spatter is significantly reduced.

However, as a method of alternately supplying a base jet current and a pulsed current, it is possible to supply no current to the welding load (low C) and to apply a pulsed high current to the low current at an arbitrary M period. There is a method of superimposing the current and a method of supplying the base current and the pulse current separately.

An example of a conventional pulse arc welding machine of this type is the first one.
It is configured as shown in the figure, in which t,11 is 1
Next -14 (la) is AC ti, +l? i terminal (a>,
(11), (C) K-contact C: electric weight transformer, (2) is a rectifier circuit that rectifies 11 AC outputs, (2) is a rectifier circuit (2) that rectifies the 11 AC outputs. )
A smoothing capacitor that smoothes the rectified output.

(4) 'i''t N P A pulse current saving supply switch unit consisting of N switching transistors (Ql) to (Qn), each of which has a
The smoothed output of the smoothing controller (3) is input to the collector of the smoothing controller (Qll). (5) is a base current supply switch unit consisting of one I'J P N type switching transistor (Sυ), and the smoothed output of the smoothing capacitor (3) is input to the collector of the transistor (Qlr). .

(6) is each transistor (Q
l) The first DC reactor connected to the emitter of ~(QT+), (7) 'd i>ifj is connected to the emitter of the transistor (Qll). ) is connected to one end of the reactor (6), and the welding wire L 110 is connected to the other end of the reactor (6) and is fed from the feeding roller (9).
- indicates a cut material that forms a welding load together with the wire (9), and a V arc (1
)) or the entire university. tJ21 is provided between one end of the reactor (7) and the base material 21'1. A second flywheel diode is provided between the other end of the &f vector (7) and the base material (10).

(+4+ (d both switch parts! 4), <51) It is a control part that controls the amount of switching, and a pulse a is diverted to the base of each transistor (Ql) to (Qn) of the switch part (4) 11f1.l?ill Outputs a pulse signal,
Base V of transistor (Qb) of switch section (5)
This base outputs a 61 pulse signal.

In addition, the circuit is composed of a 1g transformer (1), a rectifier circuit (2), and a capacitor (3).

When the base current is supplied, the transistor (S) of the switch section (5) is switched by the base current control pulse signal, and when the transistor (Ql3) is turned on,
The base current increases due to the inductive reactance of both reactors (7) and (6), and the trans/meta (Qb) is off-sult, and the base current is 14. Based on the stored blue energy of +6+, the diode is (Returns to the welding load via 121, and the base current decreases by 1
Do a little.

Therefore, as shown in Figure 2, when the base system is used (
C welding load Constant supplied welding current is a transistor (Q
(l))) is controlled to a predetermined low current base current based on the switching of (l)).

Next, when pulse current is supplied, each trans/meta (Ql) of the switch section (4) is controlled by a pulse signal for controlling pulse substitute current.
When ~(Qll) switches at the same timing and each transistor (Ql)~(Qll) turns on, the 5 pulse DC increases due to the inductive reactance of the reactor (6), and each transistor (Ql)~(Qζ]) is turned off.

The accumulated energy of the pulse current beam accelerator (6) is transferred from the molten j direction load to the molten (13) via the diode (13).
Returning to the X load, the pulsed direct current decreases.

Therefore, as shown in Fig. 2, when a pulse current is supplied, a predetermined value of 1 ? The pulse current IT) is applied to the open side.

Note that the switch section (4) may be formed of one transistor, or the five-sinch section (5) may be formed of a plurality of transistors.

However, in the case of the above-mentioned pulse arc welding machine, the supply of the base current 1b and the supply of the pulse current Iρ are performed at the switch part j5.
)', (4) is carried out separately, so we construct, compound, and generalize.

The magnitude of the ripple component of the base current ■l) and pulse current I+] is set by the switching frequency of each switch part t:5), (4), for example, the transformer/meta (Ql) to (Qn ) and (Qb), the ripple component of the base current 11+ becomes large. Therefore, the reactor (, 7) is provided and the reactor (4) is connected to the inverter, T8: It requires VC, is large in size, and has the drawbacks of being expensive.

This invention (-i, which has been removed with the above points in mind, provides a plurality of switching transistors formed by switching transistors in parallel in one river with the Ichigen seven welding load,
a switch unit that alternately supplies a base current and a pulse current to the load by switching each of the sinch circuits;
Each of the above-mentioned switch circuits VC outputs a plurality of pulse signals for a plurality of switch circuits;

base flow control means for controlling each of the pulse signals at a different frequency and frequency F when the base DC current is supplied, and prohibiting simultaneous ON of each of the switch circuits; Each pulse signal of 1"-'1l-1i
This pulse arc welding machine is characterized in that it is provided with a valve switch diversion control means for controlling several times in the same order.

When the base current is supplied and the pulse 'eK flow is supplied, each switch circuit of the switch section switches,
In particular, when the base current is supplied, the switching frequency of the switch attached to the base unit 1Xt is higher than the switching frequency of each switch circuit, for example, it corresponds to the steering wheel (7) in Figure 1. There is no need to provide an accelerator, and if the structure is simplified, it is advantageously small and inexpensive (and the ripple component of the base current can be greatly reduced).

Figure 3, which shows one embodiment of this invention, is detailed in conjunction with the drawings below.

The same symbol as in Figure 1 (indicates the d times -, fl, 51 indicates both sides and edges in Figure 1)
4), instead of (5) (switch section provided with 'C, 'i'!11 switch circuit of ti61 switch section (15)).
The smoothed output is obtained from a plurality of 1qPN type switching transistors (small) that are manually operated. ++, 71 This is the second switch circuit of the fd switch section (15), and the smoothed output of the contenza i3+ is manually input to the controller 1/N1'.
Multiple N-type switching transistors (Q, y)
Consisting of (J8) is each transistor (QX), (Q)
) +91 is a flywheel diode connected to the cathode or emitter of each transistor (QxL (Q, y), and the anode Connected to Kayo material IIα. It is a control unit that outputs a word and a base current control means, a pulse current control means, and fil#fe.

It is constructed as shown in FIG.

Figure 4 is a supply switching itj control circuit with VC and +211fi-1 oscillator and frequency divider, and when the base and - flow are supplied... Low level becomes a novel' Figure 5 (a) Base flow timing (M No. Sa and base (5) becomes low level when flow is supplied, pulse q1゛When flow is supplied...I1
Novel 51g] The pulse market diversion timing signal Sb of (b) is applied by l-1-1. 1121 id 5th
The clock oscillator (123) in the figure ((2) which outputs the reference clock signal F3G) is a 70-turn flip circuit that operates with the reference clock signal S (1), and the Q output terminal (+1) -h, etc. In addition to outputting the frequency-divided signal Sd shown in FIG. 5(d), the inverted frequency-divided series signal Se shown in FIG. 5(0) is output from the Q output terminal.

+241 U base DC timing signal Sa, reference I/R signal S (z, minute +-a t=sign Sd is input @1 Ant game 1, as shown in Fig. 5 (f) , the first gate signal Sf having a pulse width of the reference clock signal F3C synchronized with the rising edge of the minute 1 close signal 8d is output only when the base current is supplied.(25) is the timing signal for base current flow -IF!JSf11 Reference clock signal b
This is the second AND gate into which C+inverted frequency division 1 word rock Sc is input, and as shown in FIG. A second gate signal Sg having the pulse width of the signal SG is output. 126) is a timing signal S(
], is the third AND gate to which a certain reference lock signal Sc is input, and as shown in FIG. 5 (+1)K, the pulse "
The third clock synchronized with the reference clock signal Sc only when the flow is supplied.
Outputs gate signal Sb.

(27) is the first gate signal 8f and the third gate signal S11
The first OR gate ('λ8) is the first drive circuit which is input with the The pulse signal for the first switch circuit '1
G) is output to the base of each transistor (QX). j3Q) is the second OR gate into which the second gate signal Sg and the third gate signal Sb are input, and j3Q) is the second OR gate 1.
2g) is output to the base of each transistor (Qy) of the second circuit (1η) connected to the second circuit (1η).

Therefore, when supplying base current, both drive circuits'2g
1 word 14 of both pulses output from each of + and +301.

- frequency and phase 1 are different, first switch circuit 1
6+ transistors (QX) and 2 switch circuits (
Each of the transistors (Q, y) is turned on alternately and never at the same time.

Dimensions. Both drive circuits 12g) when supplying pulse current.

1 However, both pulse signals, which are applied 1 inch in front of each other, have the same frequency and the same phase 1, and each transistor (S) and each transistor (QY) &''i switch at the same timing.

When the base jet is supplied at I-, the transistor (QX) and the transistor (Q, y) are turned on alternately, and the transistor (light) or (Q, y) is turned on. The welding wire (8) and the base metal 'If
Current flows through the welding load in the form of f, and when the transistor ((field) - straddle (Q, y) turns off,
The stored energy of the reactor (18) also has a current of 7, which is the reactor +181, the welding load, and the diode 19).
, Reactor (Reduce the electric circuit of 18j and reflux.

I felt better. When pulse current is supplied, the transistor (small) and the transistor (QY) are turned on at the same time, and the transistor (QX
), (Q, Y) turn on, a larger DC current than when supplying the base current flows to the welding load, and the transistors (Qx), (
Similar to 1 when supplying current based on 5-base reflow when Qy) is turned off, the current is based on the energy stored in the reactor 181, the reactor 181, the welding load, and the diode (J9).

The reactor 118) is refluxed while reducing its electric path.

Therefore, the welding load is alternately supplied with the one-base current Ib and the pulse current I11 as shown in FIG. 5 (1) VC, and at this time, both switch circuits 1
61 and 1171 supply the base current Ib and the pulse il
Since it is also used to supply J flow Ip, the configuration can be made light purple, and when the base current is supplied, the switching frequency of the switch section (J5) that applies the base current IFIVC is 5-way switch circuit f161, 1171 switching frequency, for example, a higher frequency (
z (Satototsu Tehe, Figure 1 Nori act no den 7) 1
The ripple component of the base current 1b can be significantly reduced in a compact and inexpensive manner without providing an axle for the base current 1b.

Both switch circuits f161. The same is true when the number of IJ transistors (QxL (Qy) is 1)
J. You can get results.

a clock generator that outputs a reference clock signal for the base DC;
A clock generator may be set to output a reference clock signal for pulse flow.

In addition to providing three or more switch circuits, the control i'd
In place of I1201, a control unit is provided that outputs three or more switching control pulse signals to control the switching of each switch circuit, and each switch circuit is repeatedly turned on in sequence when supplying base current, and By turning on each switch circuit at the same timing when a pulse current is supplied, the switching frequency of the switch section for the base ``i'' current and ``ζ'' can be set to 11 Rin Takakawa wave number.

[Brief explanation of the drawing]

Figure 1 is a connection diagram of a conventional pulse arc welding machine. Fig. 2 is a waveform diagram of the welding current supplied to the welding load shown in Fig. 1, Fig. 3 and the following drawings show an example of this @Mei's less arc welding, and Fig. 3 shows the wiring connection. 41Jv'i A detailed wiring diagram of the control section in FIG. 3, and FIG. 5(a,) to <+) are timing charts of output signals of each section in FIG. 3. (1)... ■Source transformer, (2)... Rectifier circuit, +
31... Smooth contenosa, (8)... Welding wire,
(lO)...Base material, 1151...Switch part,・
! 6], fj force... 1st. 2nd switch circuit, IJ
81...DC reactor, (19)...flywheel diode, +20)...control unit, (Qx),
(Q'y)...Switching transistor. Proxy Indian Patent Attorney Narutabe Fujita

Claims (1)

[Claims] (A plurality of switch circuits formed by switching transistors are provided in parallel between the 0′ source and the welding load,
#A switch unit that alternately supplies a base current and a pulse current to the load by switching each switch circuit;
a control section that outputs each of a plurality of spin indinder control pulse signals to each of the switch circuits; and control to different phases,
base current flow control means for prohibiting simultaneous ON of each of the switch circuits; and pulse current flow control means for controlling each of the pulse signals to have the same wave number and the same phase when the pulse current is supplied. A pulse arc melting (pulse arc melting) machine characterized by being equipped with a