JPH0641728Y2 - Arc air gouging and welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an arc air gouging and welding device.

Conventional technology In conventional arc air gouging and welding equipment,
When switching from using as a welding device to using as a gouging device, it is of course necessary to connect a gouging torch instead of the welding torch, but operate the selection switch provided in the power supply device to control the gouging. The circuit needs to be driven.

A conventional selection circuit including this selection switch will be described with reference to FIG.

In FIG. 4, reference numeral 1 is a selection switch, which is a CO ₂ welding switch 1a, a MAG welding switch 1b, and a manual welding switch 1
c, has a gouging switch 1d. Each switch 1
A CO ₂ welding relay 3, a MAG welding relay 4, a manual welding relay 5 and a gouging relay 6 are connected to a, 1b, 1c and 1d, respectively.

When the CO ₂ welding relay 1a is closed, the CO ₂ welding relay 3 is driven and the CO ₂ welding control circuit is selected and driven. Similarly, if the MAG welding switch 1b, the manual welding switch 1c, and the gouging switch 1d are closed,
The welding relay 4, the manual welding relay 5, and the gouging relay 6 are driven, and the MAG welding control circuit, the manual welding control circuit, and the gouging control circuit are selected and driven.

Problems to be solved by the invention In general, construction of a welded joint portion of a structure is apt to cause defects such as insufficient penetration into the first layer. For this reason, after welding the second and subsequent layers, it is common to remove defects by back chipping due to gouging and then weld again from the back side.
The frequency of switching between welding work and gouging work is quite high. At this time, when switching to gouging work after CO ₂ welding, MAG welding or manual welding, the connection of the energizing cable to the gouging torch can be easily changed at the work site, but the control circuit can be selected using the arc air gouging dual welding device. Selection switch 1 of the selection circuit attached to the power supply unit
Therefore, the operator must move to the installation location of the power supply device. However, the installation location of the power supply device is generally several tens of meters away from the work site, and since it is often a high place where workability is poor, operating the welding switch 1 is a very troublesome work. Was there.

Means for Solving the Problems In order to solve the above-mentioned problems, the arc air gouging / welding device of the present invention is configured such that air is supplied to the welding control circuit, the gouging control circuit, and the gouging air passage to establish continuity. Equipped with a sensor that detects that the welding control circuit is detected, and when the sensor detects the conduction of the gouging air, it forcibly cancels the selection of the welding control circuit and includes the selection circuit that selects the gouging control circuit. It was done like this.

When the sensor detects that air flows through the air passage, the selection circuit forcibly cancels the selection of the welding control circuit, and the gouging control circuit is selected.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 11 is a selection switch, and CO ₂
It has a welding switch 11a, a MAG welding switch 11b, a manual welding switch 11c, and a gouging switch 11d. 1
A detection switch 2 is closed by the output of the sensor 13 shown in FIG. 2, and a detection relay 14 is connected in series.

CO ₂ welding relay 15, MAG welding relay 16 and manual welding relay 17 are connected in series to each switch 11a, 11b, 11c of the selection switch 11 via the normally closed contacts 14a, 14b, 14c of the detection relay 14, respectively. It is connected. Also, gouging switch 11d
A normally-open contact 14d of the detection relay 14 is connected in parallel with, and a gouging relay 18 is connected in series with this parallel circuit.

In the present embodiment, the CO ₂ welding relay 15, the MAG welding relay 16, and the manual welding relay 17 are welding selection relay circuits within the scope of utility model registration claims, and these welding selection relay circuits and gouging are used. A plurality of relay circuits within the scope of utility model registration are configured with the relays 18 for use.

As shown in FIG. 2, the sensor 13 is provided between the air pipe fitting 19 and the air hose 20 and detects the flow rate of air or the pressure of air. The output of this sensor 13 is the signal cable 21.
Is transmitted to the detection switch 12 via
Close 12

In the above configuration, for example, when the CO ₂ welding switch 11a is turned on, the CO ₂ welding relay 15 is driven, and the CO ₂ welding control device is selected and driven. Similarly, when the MAG welding switch 11b, the manual welding switch 11c, and the gouging switch 11d are turned on, the MAG welding relay 1
6. The hand welding relay 17 and the gouging relay 18 are driven, whereby the MAG welding control device, the hand welding control device, and the gouging control device are selected and driven.

On the other hand, when the air flows from the air pipe fitting 19 to the air hose 20, the sensor 13 detects the air, which causes the detection switch 12 to close. When the detection switch 12 is closed, the detection relay 14
Is driven, and its normally closed contacts 14a, 14b, 14c are opened. Therefore, CO ₂ welding switch 11a, MAG welding switch 11b,
Even if one of the hand welding switches 11c is closed, CO ₂
The selection of the welding control circuit, MAG welding control circuit, and manual welding control circuit is released. The normally open contact 14d is closed by the drive of the detection relay 14, and the gouging relay 1
8, the gouging control circuit is selected and driven.

Therefore, the gouging work can be performed without operating the gouging switch 11d of the selection switch 11 attached to the power supply device.

In the present embodiment, for example, a CO ₂ welding switch 11a in the selection switch 11 is a CO
_It may be replaced with the _2- welding relay 15, an analog switch may be used for the CO ₂ welding relay 15, or a circuit configuration may be formed by combining them. In this case, it goes without saying that the contact 14a of the detection relay 14 and the like are configured according to the above circuit configuration.

Further, in the case of the arc-air gouging / combining welding apparatus in which only the CO ₂ welding operation is performed as the welding operation, the selection switch 11 in FIG.

As described above, according to the present invention, when the welding work is changed to the gouging work, the sensor detects that the air is conducted to the air passage, so that the gouging control circuit is forcibly selected and driven. Therefore, the operator does not need to operate the gouging switch at a position far from the work site, and the work method can be switched efficiently in a short time.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of an arc air gouging / welding device showing an embodiment of the present invention, FIG. 2 is a side view of the main part of the device, and FIG. 3 is an arc air in another embodiment of the present invention. FIG. 4 is a circuit diagram of a main part of a welding device that also serves as a gouging, and FIG. 4 is a circuit diagram of a main part of a conventional welding device that also serves as an arc air gouging. 11 …… Selection switch, 12 …… Detection switch, 13 …… Sensor, 14 …… Detection relay, 14a, 14b, 14c …… Normally closed contact, 14d
…… Normally open contact, 15 …… CO ₂ welding relay, 16 …… MAG welding relay, 17 …… Hand welding relay, 18 …… Gouging relay.

Claims (1)

[Scope of utility model registration request] 1. A plurality of switches for selecting one of a plurality of welding types of different types or gouging, and one of a plurality of welding types of different types closed by the switch or a gouging type. A plurality of relay circuits for selecting any one, and a detection switch for detecting that the air is supplied to the gouging air passage and is in conduction, the relay circuit of the plurality of relay circuits by a relay connected in series to the detection switch. This is an arc air gouging welding device that opens multiple types of welding selection relay circuits and closes the gouging selection relay circuit.