JPS5924576A - Alternating current arc welder with arc induction circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to further improve the power factor by connecting an arc induction circuit in parallel to a transformer of an AC arc welder.

The power factor of an AC arc welder is determined by the ratio of the electric current (no-load voltage) to the arc voltage. Therefore, if the no-load voltage is made as low as possible to a value close to the arc voltage, the power factor will increase inversely. −
There is a relationship in which arc generation is proportional to -C and becomes easier depending on 4.Therefore, in practice, if the no-load voltage is lowered and the difference in arc voltage is reduced, arc generation progresses smoothly.1
It is difficult to use the qzu welding type, and in a small-capacity hanging AC arc welder, the voltage is set to about 70 V, the arc voltage is about 30 V, and [!: L existing AC arc welding] The power factor of the device is low at 42 to 45% of the human body, and therefore has the drawback of high power consumption.

As a result of research and experiments aimed at improving the power factor of an AC arc welder, the present inventors succeeded in opening the valve of the AC arc welder of the present invention, which can be expected to improve the power factor over 90% over time. This is explained in 1 and 1 based on the accompanying drawings.

Fig. 1 is a block diagram in which an arc induction circuit related to the tree L light is connected in parallel to the main 1 Herance MT of an AC arc welder, and Fig. 2 shows an embodiment of the arc induction circuit of the present invention. This is a circuit diagram, but in parallel with the main 1 to lance M-r of the AC > 7t arc welder, connect the primary side of signal 1 to lance M-r to guide 1, and connect the choke to the horn side (2) lout)'. Coil and connect through 1, make the secondary side 21 coil into 2 wheels,
One end of the inner terminal is connected to the lead 1 of the Zyristor SCR+, 5CR2 through the tie A-dead CRs, CR6, respectively. Furthermore, one end of the primary induction coils Nl and N2 wound in parallel on the primary side of the main 1 to lance M]- of the welding machine is connected to the anode of Lily Skew SCR+, 5CR2, respectively, and the other end is connected to the anode of Reilisk SCR+, 5CR2, respectively, An arc induction circuit is connected to the AC input side through CRz, and connected in parallel to the induction coils (to) 1 and N2, respectively, and resistors R3 and R4. Lance M
Connected in parallel to T, I (111 formation and l, one (there).

The effect beam of such an embodiment of the present invention will be explained below.

The present invention beam Illister SCl'? +, SCI'<2
Gay 1-signal transformer] "1 depends on Lee Irister SCR+, SCI'
l? so that it is applied alternately to 2 in CI? iX is formed, four of them are charged by the die A-D OR1 131
While the μ current j)-re-iris and tar 5CR1 discharges the charging voltage of the controller C1 to the induction coil N1 (,
(On the contrary, the condenser 07 is in a state where it is charged by the die A-C1 and the reverse voltage applied to the cathode side of the Reilister 5CR21 is turned off by the reverse voltage applied to the cathode side. Kul and SCI Mata 2 LJ
Ni]ndenri C1 and C? The voltage of Gui 1-18, which is supported by lance Tl, is turned on and off alternately by No. 8. Therefore, the induced voltage is alternately induced by induction 9 coils Nl and N2. 1 is applied to the output end of the father-flow arc welder. Therefore, as shown in Fig. 3, the induced voltage [peak point 1] 1 is applied to the no-load voltage Eo of the welder for 10 cycles. By adjusting C to the resistors R+ and R2 so that the phase (firing angle) matches the peak point Po of The arc starting voltage of occurrence 11,) acts.

Therefore, if the induced voltage E1 is set to a sufficiently high value, the no-load voltage [
. -C as low as possible and arc starting voltage (Eo+E
+) is large, arcing occurs smoothly and easily. At this time, the induced voltage [1] induced in the arc induction circuit is an extremely small current and the power consumption can be ignored, so the countercurrent arc welder of the present invention has no-load voltage E. It has the effect of increasing the arc generation voltage and reducing power consumption.

As an example of actual use, when induction lightning 11 [[+-100V, no-load voltage Lo = 35V, and arc voltage L = 32V, the arc starting voltage is E o + E 1 = 351-100
= 135V and the arc voltage [which 7h difference is H12V, the conventional no-load voltage is about 70V, the J7-ribenshi voltage is about 30V, the potential ax is 40V, and the electric power consumption is 40V. However, there is a clear advantage that the conventional J: ratio is halved.

In addition, the Hokomei AC arc) 8 welding device has good arc stability, welding 1 and operation 1 are smooth, and even beginners can perform good welding. Furthermore, since Meiji's power factor can be improved to more than 90% when using wood, it eliminates the need for a separate power factor improvement tool in conventional countercurrent arc welders. .

In addition, the small type 6 with a culm degree of 3.5-5 KV△ is convenient and can be used easily in cottage industries, laboratories, etc. with small receptive horns.

Next, the present invention)/l shear arc welding device performance is 1rY->
J as shown in Table 1 in comparison with that of Is.

Table 1 Next, regarding FIG. 4, M1 light will be explained.

Figure 4 shows the arc induction shown in Figure 2 above) 9 circuit induction: Ron Henry C3 and OA are connected in parallel to N+ and N2, respectively.
AC arc induced voltage in the C1 secondary
31, the peak point 1]l of the arc-induced lightning fX IE + is the no-load voltage [. peak point 1].

Even if there is some Z2 of any phase, the oscillation of the arc-induced voltage 131 will cause the arc-induced lightning to spread over a wide range -CC, and the arc will occur smoothly. j(1
! So that I don't wake up.

Also, Figure 6 shows the induction of the arc induction circuit in Figure 012)! ) Coils Nl and N2 are separately connected to the primary side of 1 to 1-2.
~parallel to the secondary side of lance M-1-) i'j L/
So, the secondary side of the welder? Condenser C5 is interposed to prevent reverse flow of ffi + and [. Of course, this embodiment can add the circuit to the circuit in the arc welder.
By making the vine a separate stand-alone product and connecting it in parallel to an existing arc welder, it has the feature that it can be used without making any special structural changes to the existing welder.

In the embodiment of the present invention, the secondary coil N3 of the lance T7 can be made of Ni-Cr wire, and the capacitor C5 can be omitted.

Figure 7 also shows the relay resistors -8CR1 and 5CR for opening and closing diodes CR+ and CRz in the arc induction circuit shown in Figure 2.
Replace with A1. [Note Zylister SCR: +, 5CR
By connecting each gay 1- and J sword of A to the current transformer C1- installed at the secondary output end of the main transformer M]-, main 1 to lance M are connected when the welder starts working. When a load is applied to the secondary side of T, a current is induced in the current transformer CT, which is rectified by the diode CR and the charging current of the condenser C3 becomes the current of the Zyristor S CR3, S'Cr<, l's Gui1-
If you do not trigger the induction circuit to ONt, that is, if no load is applied to the secondary side of the main lance MT, no current will be induced in the current transformer CT, so 1 Nyristor SCR: +, 5CRa is in operation and the arc induction circuit is in the OFF state. Therefore, even if the welder is connected to the power supply, the arc 1 + rJ circuit does not move, and no induced voltage is applied to the secondary side of main 1, lance, and I, so high voltage does not occur to the worker. Electric shock due to carelessness! It is safe because it can prevent accidents.

Also, due to the welding work, a load is applied to the secondary side of the main transformer MT, and when the induction circuit is turned on, an induced voltage is applied to the secondary side of the main transformer MT, which becomes a high voltage and can easily cause an arc. However, in an arc state, the voltage of the induction circuit drops to the arc terminal voltage, so there is a risk of electric shock during welding work.
As a result, the risk of electric shock can be eliminated and covered.

As described above, the present invention connects the arc conductor circuit to main 1 to lance MT of an AC arc welder and connects it to 11 in parallel with the main 1 to lance MT of an AC arc welder, and applies an arc induced voltage to the output end of the welder using the arc induction circuit, thereby achieving a low power supply. ? Even with uliE (low no-load voltage), arc generation can be made smoother, and the power factor can be improved by more than 90%1, thereby reducing power consumption, which plays an important role in energy saving and is an industrially popular product. This is a very effective invention.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram of the present invention, Fig. 2 is a circuit diagram showing an embodiment of the invention, Fig. 3 is a waveform diagram of the operation of the above embodiment, and Fig. 4 is a diagram of the circuit of Fig. 2. Induction coil N+, N
An example diagram in which Conan 1°-1 is connected in parallel to 2,
Figure 15 shows the operation of the embodiment in Figure 4.1 waveform diagram and Figure 6.
J, Fig. 2 induction) An example diagram in which 9 coils Nl and N2 are separately connected to the primary side of the lance, and the voltage induced on the primary side is connected in parallel to the secondary side of the welder main 1 to the lance, Figure 7 shows an example of a safety circuit incorporated/v. Special +7. Applicant Jeong Lee, 1 representative, patent attorney Hidetake Komatsu ¥1-1 calculation 3] times

Claims (3)

[Claims] (1) In AC arc welding equipment, gate signal 1
~The primary side of lance 1'1 is connected to the input side of the jog coil Ll.
The secondary coil is 2m long and the inner terminals are connected to each other through diodes CRs and CR6.
<t, one end of the primary induction coils N+, N2 connected to SCIC2O4-1~ and further wound in parallel to the primary side of the main transformer MT of the welding machine is connected to Reilirisk-3C.
The other end is connected to the anode of I'< 1.5CR2 to the AC input side through the diodes CR+ and 'CRz, respectively, and the water induction coils Nl and N2 are connected to the densifiers C1 and C2, respectively.
By connecting resistors R3 and Ra in parallel and connecting an arc induction circuit (-) in parallel to the main lance MT, an induced voltage is alternately induced in the induction coils I'yl+ and N7. The arc induced by applying the current to the output end of the main lance M1 improves the J rate by applying the arc to the output end of the main lance M1. (2) Primary induction coil N1 of the above arc induction circuit,
N2, I, and C4 are connected in parallel, respectively, and the arc induction circuit of claim 1 is connected to the arc welder. (3) In the counter-current fusing device, Gui 1-Signal I
I] 1 - The primary side of lance T1 is choked at the input end: 1 Il[1 is applied through it, the secondary coil is 2 and 1 ζ, and the inner terminals are connected to each diode Cl'< 5, OR6 to the U-ray resistor SCR+, Further, the arc induction coils N1 and N2 are connected to the primary side of the separate 1-lance T7, and one end thereof is connected to the anode of Suiristar SCR+ and 5CI-<2, respectively, and the other end is connected to the diode C. [〈,, connected to the AC input side through cR2,
9 coils Nl and N2 each have a condenser coil C1,
An arc induction circuit characterized in that when C2 and resistors R3, R, and l are connected in parallel, the secondary side of lance T2 is applied to the output end of an AC arc welder. The right AC arc welder. C) In AC arc welding equipment, for gay 1-signal)
The primary side of Herance T+ is the choke coil Ll on the input side.
Apply voltage through the welder, connect the secondary coils to 2 coils, connect the inner terminals to the gay 1~ of Iristor 5CR1 and SCR2, and wind them in parallel to the primary side of the main lance MT of the welder. One end of the wired primary induction coil Nl, 'N2 is connected to Lily Skew 5CR1,
The other end is connected to the anode of 5CR2, and the other end is connected to the saw sword of 5CR4, and a current transformer C- is installed at the secondary output end of the main 1 to lance MT for the above-mentioned opening and closing. 1Nylister-3CR3,5CR4
When the welder is in use, the current induced in the current transformer CT turns the arc induction circuit ON, and when the welder is not in use, the safety circuit turns OFF. An AC arc welder that has an arc induction circuit that covers the installation.