JP2560901B2 - TIG welding equipment - Google Patents

Description

The present invention relates to a TIG welding apparatus having extremely high work efficiency.

"Prior Art" TIG welding equipment performs welding by causing arc discharge from the electrode of the welding torch to the welding material. Therefore, it is necessary to separate the electrode and the welding material in advance by a predetermined distance. That is, when the distance between the electrode and the welding material is too long or too short, the welding quality deteriorates.

In the conventional TIG welding apparatus, a method as shown in FIG. 3 has been adopted to set the distance between the electrode and the welding material (hereinafter referred to as arc length).

In the figure, reference numeral 1 is a welding torch, which is movable in the vertical direction, and an electrode 2 is provided at its tip. Further, 3 is a welding material to be welded.

An operator inserts an arc length setting gauge 4 processed to have a predetermined thickness (arc length) between the electrode 2 and the welding material 3 and moves the welding torch 1 up and down to set the arc length. .

After that, the arc length setting gauge 4 is removed and the electrode 2
When a predetermined high voltage is applied between the welding material 3 and the welding material 3, arc discharge occurs between the two, and the welding material 3 is welded.

"Problems to be Solved by the Invention" By the way, since the above-described arc length setting work is performed manually by workers, the accuracy deteriorates due to individual differences among workers, and it is difficult to set high accuracy. was there.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a TIG welding device that allows easy adjustment of the arc length and enables extremely accurate adjustment.

"Means for Solving the Problem" In order to solve the above problems, the present invention applies an electrode to which one pole of a welding power source voltage is applied and the other pole of the welding power source voltage to place a member to be welded A back bar, a voltage source for applying a predetermined voltage between the electrode and the back bar, a notification means for notifying that a current flows from the voltage source, the electrode and the welded object. It is characterized by comprising a measuring means for measuring the distance to the member.

[Operation] When the welding material is placed on the back bar and the electrode is brought into contact with the welding material, a current flows from the voltage source, and the notification means gives a notification to that effect.

Next, when the electrode is gradually separated from the welding material, both of them are separated and the above-mentioned notification is stopped at the same time. Is adjusted, the distance between the electrode and the welding material is set corresponding to the predetermined value.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG.
In the figure, parts corresponding to those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 5 is a casing of the TIG welding apparatus, which is formed in a substantially U shape. In addition, the upper plate portion 5a and the lower plate portion of the casing 5
A columnar column member 5c is fixed between it and 5b. Further, the upper plate portion 5a is provided with a through hole 5d.

Next, 6 is a torch support member, to which the welding torch 1 is fixed at one end, and at the other end, a vertical movement measuring gauge 7 for displaying the distance between the torch support member 6 and the lower plate portion 5b is attached. Has been. The display value of the vertical movement measurement gauge 7 can be appropriately reset to "0".

Further, the torch support member 6 is axially supported by the column member 5c via the bearing 6a, and is slidable in the vertical direction in the figure. Further, between the bearing 6a and the welding torch 1, the torch support member 6 is provided with a through hole 6b having an internal thread.

Next, 8 is an up-down adjusting screw, which is composed of a head portion 8a having a diameter slightly larger than that of the through hole 5d, and a screw portion 8b into which the through hole 5d is loosely inserted and screwed into the through hole 6b. Further, 9 is a back bar on which the welding member 3 is placed.

Next, the electrical configuration of this embodiment will be described with reference to FIG.

In the figure, reference numeral 11 is a welding power source device, which applies a predetermined high voltage between the welding torch 1 and the back bar 9 when a commercial power source is supplied through the contactor 10. The welding torch 1 and the back bar 9 are connected to the relay 16 and the contactor 1.
2. A 24V DC power supply 14 and a contactor 13 are sequentially connected. Here, the contactors 12 and 13 are
Is configured to be turned on / off in a complementary manner.

Next, 18 and 19 are a buzzer and a lamp, respectively.
When a predetermined voltage is applied from the power supply 15 through the contactor 17, the sound and the light are emitted.

 Next, the operation of this embodiment having the above configuration will be described.

First, the operator sets the contactors 12 and 13 to the ON state. As a result, the contactor 10 is turned off.

Next, the vertical adjustment screw 8 is rotated clockwise to move the welding torch 1 downward. As a result, the electrode 2 and the welding member 3 come into contact with each other, and the power source 14 causes the respective constituent elements 12, 16, 1, 1.
A current flows through 3, 9 and 13 in sequence.

When a current flows through the relay 16, the contactor 17 is turned on, the buzzer 18 sounds and the lamp 19 is turned on. This allows the operator to know that the electrode 2 and the welding material 3 have come into contact with each other.

Next, the operator slowly turns the vertical adjustment screw 8 counterclockwise until the sound of the buzzer 18 and the lighting of the lamp 19 stop. As a result, the electrode 2 and the welding material 3 are slightly separated. Then, in this state, the indicated value of the vertical movement measuring gauge 7 is reset to "0". As a result, thereafter, the vertical movement measuring gauge 7 displays the distance between the electrode 2 and the welding material 3, that is, the arc length.

The operator turns the vertical adjustment screw 8 while monitoring the vertical movement measuring gauge 7 to set the arc length to a predetermined value. When the arc length is set, the contactors 12 and 13 are set to the off state. As a result, the contactor 10 is turned on, commercial power is supplied to the welding power supply device 11, and a predetermined high voltage is generated. This high voltage is applied between the welding torch 1 and the back bar 9, arc discharge is generated between the electrode 2 and the welding material 3, and the welding material 3 is welded.

Thus, according to the present embodiment, the vertical movement measuring gauge 7
Since the accurate arc length is displayed, the arc length can be set with extremely high accuracy (± 0.01 mm error), and there is no individual difference.

In addition, since work such as inserting a gauge between the electrode 2 and the welding material 3 is unnecessary, work efficiency is improved.

Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, a motor with an encoder or the like may be attached to the vertical adjustment screw 8 and the arc length may be automatically set by rotating the motor so that the detected value of the encoder becomes a predetermined value.

"Effects of the Invention" As described above, according to the TIG welding apparatus of the present invention,
It is possible to set the arc length with extremely high accuracy.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a TIG welding apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing its electrical configuration, and FIG.
The figure is an explanatory view of a conventional arc length setting method. 2 ... Electrode, 7 ... Vertical movement measuring gauge (position display means), 9 ... Back bar, 14 ... Power supply (voltage source), 18 ...
… Buzzer (detection means), 19… Lamp (detection means).

Claims (1)

(57) [Claims] 1. An electrode to which one pole of a welding power source voltage is applied, a back bar to which the welding power source voltage and the other pole are applied, and a member to be welded is placed, the electrode and the pack bar. A voltage source for applying a predetermined voltage between the two, a notification unit for notifying that a current flows from the voltage source, and a measuring unit for measuring the distance between the electrode and the member to be welded. TIG welding equipment characterized by that.