JPS6348636B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a DC arc welding machine that shields a welded area with a gas mainly composed of carbon dioxide gas and an inert gas.

Conventional configurations and their problems In recent years, consumable electrode type arc welding machines have become popular, and the field of use is expected to expand in the future. It is being These functions include a crater control function that reduces the welding power at the end of welding, fills in the concave crater that forms at the end of welding, adjusts the bead shape, and ensures welding strength, as well as a control switch that controls the welding power. An arc spot that enables spot welding and tap welding by starting welding by starting, then operating a timer for a certain period of time, and stopping the output after the timer period has elapsed to keep the welding time constant. It has a control function.
The above-mentioned crater control function and arc spot control function were previously added only to specific arc welding machines, but in recent years, due to the demand for multifunctional arc welding machines, it is now possible to combine both of these functions in one machine. Products that are compatible with arc welding machines are being manufactured.

Hereinafter, a conventional arc welding machine as described above will be explained with reference to the drawings.

FIG. 1 shows a conventional arc welding machine. In Figure 1, 1 is the input terminal of the arc welding machine, 2 is a transformer that steps down the input AC voltage to a voltage suitable for welding, 3 is a control element such as a thyristor that controls the output of the welding machine, and 4 is a welding machine. 5 is a welding base material, 6 is a consumable electrode, 7 is a feeding device for feeding the consumable electrode, 8 is a welding condition command device for setting welding output conditions, 9 is a crater output condition 10 is an output controller, and 10a receives signals from each of the welding condition command device 8 and crater condition command device 9, and causes the control element 3 to respond to the command signal. An output controller 10b receives signals from each of the welding condition command device 8 and crater condition command device 9, and controls the feeding motor of the consumable electrode feeding device 7 in accordance with the command signal. This is an output controller that outputs a rotational speed signal. 12 is a spot time command device that commands arc spot time during arc spot welding;
Reference numeral 13 denotes an operating switch for instructing the arc welding machine to start and stop the output, and is operated by the welding operator with his/her hand. 14 is the operating switch 13;
Arc spot time limit circuit 15 which starts output upon receiving the ON signal and stops output after a time determined by the output signal of the spot time command unit 12;
1 is an arc spot switch for selecting the presence or absence of arc spot control. When this arc spot switch 15 is turned to the "enabled" side and the circuit is opened, arc spot control is performed. When the circuit is turned to the "no" side and the circuit is in the shot state, the arc spot timer circuit 14 is short-circuited.
Arc spot control is no longer performed. Reference numeral 16 denotes a crater control circuit which has a self-holding function in which one cycle consists of two opening and closing operations of the operating switch in response to the output of the operating switch 13; in other words, it outputs an output in response to the first ON signal of the operating switch. , it has the function of holding the output at the first OFF signal and the second ON signal and stopping the output at the second OFF signal, and transmits the output to the crater switching circuit connected to the subsequent stage of the crater control circuit 16. The output is output by the operation of sending the signal to the output switch 18 via the switch 17 and the second ON signal of the operation switch 13.
The crater controller 1 has a crater control function that stops the output in response to the second OFF signal, and the output is transmitted to the crater controller 1 via the crater switch 17 connected to the subsequent stage.
Perform the same action as sending to step 9. 17 is a crater switch for selecting "with" and "no" crater control, and has two interlocking contacts 17a, 17.
It is composed of b. 18 is an output switch for switching the output signal of the welding machine, and a transistor 18a
, a relay 18b driven by this transistor 18a, and a contact 18c of this relay 18b.
The contact 18c of the relay 18b is inserted into the output side of the output controller 10a and the output controller 10b, and the welding output can be opened and closed by opening and closing the contact 18c.

19 is a crater controller that switches crater signals, and includes a transistor 19a, a relay 19b driven by the transistor, and this relay 1
9b and contact 19c, and the relay 19
The contact 19c of b is inserted into the output side of the welding condition command device 8 and the crater condition command device 9, and is connected to the relay 19b.
is in the OFF state, the command signal of the welding condition command device 8 is connected to the subsequent controller 10, and the relay 19c
The contact structure is such that the command signal from the crater condition command device 9 is connected to the output controller 10 when the is in the ON state.

The operation of the conventional arc welding machine configured as described above will be explained below.

In a conventional arc welding machine, normal welding is performed by turning the arc spot switch 15 to the "no" position and the crater switch 17 to the "no" side, and the operation is shown in Fig. 2a. As shown in the flowchart of ~c.

In Fig. 2a, the output signal b of the operation switch 13 is the output signal of the output switch 18, c shows the output condition of the welding machine, and the output signal b of the output switch 18 is the output signal of the arc spot switch 15. Since the crater switch 17b is turned to the "no" side, it synchronizes with the opening/closing signal of the operating switch. Output condition c
Since the crater switch 17a is turned to the "no" side, the transistor 1 of the crater controller 19
Since 9a does not operate and relay 19b is not required, this is the welding output condition.

When performing crater control welding in a conventional arc welding machine, it is performed by turning the arc spot switch 15 to the "off" position and the crater switch 17 to the "present" side, and the operation is shown in Fig. 3a.
As shown in the flowchart of ~d. FIG. 3a shows the signal from the operating switch 13, and b shows the output switch 18 which is self-held by the self-holding function of the crater control circuit 16 in response to the signal from the operating switch.
The output signal, c, was produced by the crater control function of the crater control circuit 16. Crater controller 1
Based on the thread force signal of the output switch 18 and the output signal of the crater switch 19, the output conditions of the welding machine are as shown in d, which outputs the welding output condition and the crater output condition, and performs crater control welding. can be done.

In a conventional arc welding machine, when performing arc spot control welding, the arc spot switching device 1
5 to "Yes" and crater switch 17 to "No"
It is performed by tilting it to the side, and the movement
The process is as shown in the flowcharts in Figures a to d. Figure 4 a shows the output signal of the operation switch 13, and b shows the output signal that starts output upon receiving the ON signal of the operation switch 13 and stops output after the time _t1 determined by the output signal of the spot time command device 12. c is the output signal of the output switch 18 which receives the output of the spot timer circuit 14 and outputs it, d is the output condition of the welding machine, and in this case, since the crater controller 19 does not output The welding output condition is set, and the operating switch 13 is set as described above.
Arc spot control welding can be performed for a certain period of time upon receiving the ON signal.

As described above, the conventional arc welding machine performs the crater control function and the arc spot control function, but in the conventional configuration, the welding condition command unit 8, crater condition command unit 9, spot time command unit 12 It requires many command devices such as These command devices generally use variable resistors, but the number of variable resistors has increased. Furthermore, the shape of the operation box to which the variable resistor and the like are mounted becomes large, which is uneconomical.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and is economical by reducing the number of command devices and reducing the shape of the operation box to which command devices such as variable resistors are attached while achieving the same function. The object of the present invention is to provide an arc welding machine that is advantageous in terms of performance.

Structure of the Invention In order to achieve this object, the present invention comprises a DC arc welding machine having a crater welding control function and an arc spot welding control function, and includes a command unit, an output controller, an arc spot timer circuit, and an arc spot switch. The command unit and the output controller are connected by turning the arc spot switching device on the arc spot ``absent'' side, and the said arc spot switching device is connected to the arc spot ``present'' side by turning the arc spot switching device on the arc spot ``present'' side. A command device and an arc spot time limit circuit are connected, and the command device is selectively connected to both the output control circuit and the arc spot time limit circuit.

DESCRIPTION OF EMBODIMENTS The configuration and embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows the configuration of an arc welding machine according to an embodiment of the present invention. In Figure 5, 1 is the input terminal of the arc welding machine, 2 is a transformer that steps down the input AC voltage to a voltage suitable for welding, 3 is a control element such as a thyristor that controls the output of the welding machine, and 4 is a welding machine. Characteristic improvement reactor 5 is a welding base material, 6 is a consumable electrode, 7 is a feeding device, 8 is a welding condition command device, 9' is a command device, 10 is an output controller, 13 is an operation switch, and 14 is an arc The spot timer circuit 15 is an arc spot switch, and is composed of two interlocking contacts 15a and 15b. 16 is a crater control circuit, 17 is a crater switch, 18 is an output switch, and 19 is a crater controller.

In the arc welding machine of this embodiment, one of the two contacts of the arc spot switching device, contact 15a, is arranged in the same manner as in the conventional arc welding machine, but the other contact 15b is arranged as a command device 9'. Output controller 1
0 and the arc spot timer circuit 14,
Connect the common terminal of the above switching device to the command unit 9', and connect the terminal on the arc spot "no" side to the crater switching device 1.
It is connected to the output controller 10 through the contact 17c of No. 7, and the terminal on the arc spot "present" side is connected to the arc spot time limit circuit 14. By making such a connection, in the arc welding machine according to this embodiment, the command device 9' can have the functions of both a crater condition command device and an arc spot time command device.

In other words, the arc spot switch 15 is set to "no".
When it is falling to the side, the output of the command unit 9' is sent to the output controller 10 via the contact 17c of the crater switch 17.
When the crater switching device 17 is turned to the "present" side in this state, crater control becomes possible and can be used as a crater condition command device.The arc spot switching device 15 is set to the "present" side. When it is falling down, the output of the command device 9' is connected to the arc spot time limit circuit 14, making it possible to control the arc spot, and the command device 9' can also be used as an arc spot time command device. .

Incidentally, since it is impossible to perform arc spot control welding and crater control welding at the same time, the arc welding machine of the present invention does not cause any inconvenience in use.

In this embodiment, the crater condition command device was explained as being independent, but some current arc welding machines have two command devices: a crater voltage condition command device and a crater current condition command device. In this case, it is possible to use either one of the two crater condition directive devices as the arc spot time directive device according to this embodiment.

Effects of the Invention As described above, according to the present invention, since the crater condition command device can also be used as an arc spot time command device, the number of command devices such as variable resistors can be reduced, and The shape of the operation box to which the command unit is attached can be made smaller.
The economic effects are significant.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional DC arc welding machine with crater welding control function and arc spot welding control function, Figure 2 is a flowchart when performing normal welding using a DC arc welding machine, and Figure 3 is a Flowchart when performing crater control welding,
FIG. 4 is a flowchart for performing arc spot welding, and FIG. 5 is a configuration diagram of a DC arc welding machine according to an embodiment of the present invention. 9'...Command device, 10...Output controller, 14...
...Arc spot time limit circuit, 15...Arc spot switching circuit.

Claims (1)

[Claims] 1 A DC arc welding machine having a crater welding control function and an arc spot welding control function is configured, and the command unit and output controller are connected by turning on the command unit, arc spot time limit circuit, and arc spot “no”. , by switching the arc spot switch to the arc spot "present" side, the command device and the arc spot time limit circuit are connected, and the command device is selectively connected to both the output controller and the arc spot time limit circuit. DC arc welding machine.