JPH1133729A - Semi-automatic tig welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the semi-automatic welding equipment capable to easily produce the TIG welding wire at will by controlling the feeding speed of the TIG welding wire to be fed from a semi-automatic GMA equipment through an induction tube by the wire inching switch in a remote control box, activated by the wire feeding switch. SOLUTION: With a welding torch 3 equipped with a torch switch 4 effectuate semi-automatic welding of a base material 6 connected with a TIG welding power source 1 by a cable 5. Into a welding pool, the TIG welding wire 15, which is fed by a wirefeeder 8 connected with a power source 7 through the induction tube 13, is fed by a wire nozzle 4. At this time, a wire switching terminal 10 in the remote control box 9 is operated effectuating a wire feeding switch 12 installed at the wire nozzle 14 through a controlling device 11. In above-said order the feeding of the wire 15 is on off controlled at will by controlling the wire feeder 8 via power source 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-automatic TIG welding device for manually operating a TIG torch and feeding a welding wire by driving a motor.

[0002]

2. Description of the Related Art In the TIG welding method, an arc is generated between a non-consumable tungsten electrode and a base material in an inert gas atmosphere, and the base material is locally melted by this arc heat to join the base material. Arc welding method. In manual TIG welding, the operator holds the welding torch in one hand, moves the welding torch in the welding direction while maintaining the arc generated between the tungsten electrode at the tip of the welding torch and the base metal, and performs arc heat Welding is performed by sequentially supplying a filler rod with the other hand to the molten pool of the base material that has been melted. The supply of the filler rod is carried out manually by moving the filler rod with the finger of the other hand as the tip of the filler rod is melted and consumed. That is, in TIG welding, an operator determines an appropriate molten state of the base material and, while maintaining it, needs an appropriate filler rod feeding operation, and maintains an appropriate molten state and an appropriate molten state. In order to balance the feeding of the filler rod, a high level of skill is required of the operator.

In order to reduce the burden on the rod feeding operation in the TIG welding skill, a semi-automatic TIG welding device using a welding wire instead of a filler rod and having a wire feeding device for automatically feeding the welding wire is used. Is done.

[0004]

Conventionally, a commercially available semi-automatic TIG welding apparatus for automatic welding wire feeding is basically manufactured as a dedicated apparatus, and is expensive due to having a wire feeding apparatus. The wire feeder operates in conjunction with the TIG welding power supply, that is, it is performed by sequence control, such as starting the feeding of the welding wire after the arc is ignited. It is difficult to control by the will and judgment of the operator, such as adding a large amount.In general, the wire feeder is used with an integrated dedicated torch that fixes the wire feed nozzle to the welding torch, generated by manual welding There is a problem that a welding defect is easily caused due to a change in an appropriate wire feeding position to an appropriate molten pool due to hand shake or the like.
The gas metal arc semi-automatic welding method is much more versatile than the TIG welding method, and many welding workshops are equipped with gas metal arc semi-automatic welding equipment. However, the wire feeding device of the gas metal arc semi-automatic welding device has a wire supply speed that is too high for use in TIG welding. TIG welding equipment is generally used for manual welding.

[0005] The present invention has been made in view of the above circumstances, and a highly versatile gas metal arc semi-automatic welding apparatus,
It is an object of the present invention to provide a semi-automatic TIG welding device that allows a welding operator to easily supply a welding wire at an arbitrary timing and at a speed suitable for a TIG welding operation by adding a control device having an appropriate function.

[0006]

In order to add a motor-driven welding wire device that is easy to handle and has excellent welding workability to a manual TIG welding device (welding power source, torch cable, welding torch) at low cost, a semi-automatic gas is used. We considered using metal arc welding equipment. An attempt was made to remodel the wire feeder of the semi-automatic gas metal arc welding machine alone, but it was expected that the control circuit would be complicated and expensive if used alone. Finally, the present inventors have found that by modifying the wire inching function of the remote control box of the semi-automatic gas metal arc welding apparatus, it is possible to obtain a wire supply speed suitable for TIG welding with the simplest control, and reached the present invention.

To achieve the above object, a semi-automatic TIG welding apparatus according to the present invention comprises a TIG welding power source (1) and a welding torch (3) connected to the TIG welding power source (1) via a torch cable (2). ), A torch switch (4) attached to the welding torch (3), a base material connecting cable (5) for connecting the TIG welding power supply (1) and the base material (6), and a TIG welding wire feeder. It is a device composed of: The TIG welding wire feeder includes a gas metal arc welding power supply (7), a gas metal arc welding wire feeder (8) connected to the welding power supply (7), and a wire feeder. Welding wire conduit (13) that guides the TIG welding wire mounted on and sent to (8)
And a wire nozzle (14) attached to the tip of the welding wire conduit (13), and connected to a gas metal arc welding power supply (7) and mounted on a gas metal arc welding wire feeder (8). Gas metal arc welding remote control box (9) for inching the TIG welding wire, the contact connected to the terminal of the wire inching switch (10) of this remote control box (9), and the opening time and closing time of this contact. A control device (11) having a circuit for repeating opening and closing of the contacts corresponding to each timer set for each and the set time of each timer,
A wire feed switch (12) attached to the wire nozzle (14) to turn on and off the control device (11).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a configuration of a semi-automatic TIG welding apparatus according to an embodiment of the present invention.
This semi-automatic TIG welding device is a combination of a manual TIG welding device and a TIG wire supply device obtained by modifying a gas metal arc welding device. Hereinafter, the TIG is sometimes indicated as TIG and the gas metal arc is indicated as GMA. TIG manual TIG welding equipment is a TIG
A welding power supply 1, a TIG welding torch 3 connected to the TIG welding power supply 1 via a torch cable 2, and a power supply from the TIG welding power supply 1 to the TIG welding torch 3 attached to the TIG welding torch 3 to be turned on / off. It comprises a torch switch 4 and a base material connection cable 5 for connecting the TIG welding power source 1 and the base material 6. On the other hand, the TIG wire supply device includes a GMA welding power source 7 having a constant voltage characteristic and a GMA welding power source.
GMA welding wire feeder 8 connected to welding power source 7
A welding wire conduit 13 for guiding a welding wire fed from the GMA welding wire feeding device 8, and a welding wire conduit 13
A wire nozzle 14 attached to the tip of the
A GMA remote control box 9 connected to the welding power source 7 for inching the welding wire 15 mounted on the GMA welding wire feeder 8 and further turning on / off the application of a voltage to the wire inching circuit of the remote control box 9. The control device 11 is connected to the control device 11 via a control cable attached to the wire nozzle 14 and connected to the control device 11.
And a wire switch 12 for turning on / off the operation. The welding wire 15 is a GMA in the form of a reel.
It is mounted on the welding wire feeding device 8. The components 1 to 5 of the manual TIG welding device used here, the GMA welding power supply 7, the GMA welding wire feeder 8 and the GMA remote control box 9 are generally commercially available, while the control device 11, The wire feed switch 12, welding wire conduit 13 and wire nozzle 14 are dedicated to the semi-automatic TIG welding device of the present invention.

By the way, the inching of the welding wire is G
This refers to sending out the welding wire 15 from the GMA welding wire feeder 8 without generating an arc via the MA welding power source 7, and this inching operation is performed by pressing down an inching button 10 provided on the GMA remote control box 9. Done. When the inching button 10 is depressed, the drive circuit of the motor provided in the GMA welding wire feeder 8 operates, and the motor rotates to feed the welding wire. The inching speed of the welding wire is controlled by the welding current adjusting volume VR provided in the GMA remote control box 9.
It becomes variable by adjusting 1 (variable resistance). VR2 in FIG. 1 is for adjusting the welding arc voltage. However, in the inching operation by the GMA remote control box 9, even if the volume is set to the minimum value, the welding wire required for the TIG welding cannot be fed at a low speed. This is because the wire melting mechanism is basically different between GMA welding and TIG welding. That is, in the GMA welding, the welding wire itself is melted as a consumable electrode by the arc generated between the tip of the fed welding wire and the base material.
In G welding, the welding wire is melted by arc heat generated between a non-consumable electrode (for example, a tungsten electrode) and a base material, so that the melting speed is much slower than that of GMA welding.

Therefore, a dedicated control device 11 of the semi-automatic TIG welding device of the present invention is provided for low-speed feeding of the welding wire. As shown in FIG.
Is the inching button 10 of the GMA remote control box 9
On / off of the contact T1 connected in parallel with the inching button 10 to the terminals 19, 20 of the two timers T1,
Repeatedly by T2. The ON time is set by the timer T2, and the OFF time is set by the timer T1. Control device 1
Reference numeral 1 is connected to an AC 100 V power supply, and activates the control device 11 when the wire feed switch 12 attached to the wire nozzle 14 is turned on, and stops when the wire feed switch 12 is turned off. The circuit of the control device 11 is not limited to that shown in FIG.
1 is a circuit that repeats ON / OFF at a desired time, and the power supply connected to the control device 11 is AC100V
The power source is not limited to the power source, and any device may be used as long as the control device 11 operates.

FIG. 3 schematically shows the voltage V applied to the motor of the GMA welding wire feeder 8 when the wire feed switch 12 attached to the wire nozzle 14 is turned on. Since this voltage is a pulse voltage, the average rotation speed of the motor can be reduced as compared with the case of a constant voltage. The rotation speed of the motor, that is, the feed speed of the welding wire, can be arbitrarily changed by changing one or both of the pulse frequency according to the set times of the timers T1 and T2 and the set value VR of the volume of the GMA remote control box 9. Can be changed. By turning on / off the wire feed switch 12, the welding wire can be fed intermittently at an arbitrary timing. Further, by appropriately selecting the pulse frequency, that is, by reducing the pulse frequency, the welding wire can be intermittently fed even when the wire feed switch 12 is turned on.

Next, the welding operation by the semi-automatic TIG welding apparatus according to the present embodiment will be described. (1) TIG welding power supply 1 and MAG welding power supply 7 are turned on, and AC100V is connected to control device 11. (2) TI with torch switch 4 attached to one hand
Holding the G welding torch 3 and holding the wire nozzle 14 with the wire feed switch 12 attached to the other hand, TI
The TIG welding torch is moved in the welding direction while maintaining the arc generated between the tungsten electrode at the tip of the G welding torch and the base material. (3) At the same time, the welding operator judges the molten state of the base material, supplies the welding wire to the molten pool and proceeds with welding while turning on / off the wire feed switch 12 as appropriate. Depending on the welding, welding in which the feed switch 12 is kept pressed to continuously supply the wire is also possible. In any case, the insertion angle and the addition position of the welding wire into the molten pool are adjusted by appropriately operating the wire nozzle.

As described above, when the welding operator wants to supply the welding wire, he only has to look at the supply position and press the wire feed switch 12 appropriately, so that the welding rod is moved by the finger as in the conventional case. There is no necessity, and TIG welding can be easily performed without a high level of skill in feeding the filler rod.

The semi-automatic TIG welding apparatus of the present invention
It is a matter of course that the TIG welding torch and the wire nozzle can be mounted on a motor-driven truck and used as an automatic TIG welding device.

[0015]

According to the present invention, the following effects can be obtained.

By using a hand-held gas metal arc welding device including an expensive motor-driven wire supply device, and adding a control device for turning on and off the switch in a timely manner, a welding wire conduit, a wire nozzle, and the like, Since a TIG welding wire supply device can be manufactured, a semi-automatic TIG welding wire supply device can be obtained at a much lower cost than a dedicated TIG welding wire supply device. Since the welding wire can be supplied only by turning on and off the switch according to the judgment of the worker, the skill of the worker can be fully exhibited by focusing on the formation of the weld bead.

Since this apparatus is basically used in a state where the wire feeding nozzle and the welding torch are separated from each other, the insertion angle of the rod, the adding position, the adding time, the adding time, and the like depend on the torch position and the molten state of the welded portion. The amount etc. can be adjusted at the discretion of the operator. In addition, when welding in which the wire nozzle is fixed to the welding torch is desired, the attached simple wire feeding nozzle can be attached to the nozzle holder at an arbitrary insertion angle and welded.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a semi-automatic TIG welding apparatus according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a control device added to a gas metal arc semi-automatic welding device for automatically feeding a TIG welding wire.

FIG. 3 is a schematic diagram showing a pulse voltage applied to a welding wire feeding motor by a control device for automatic TIG welding wire feeding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 TIG welding power supply 2 TIG welding cable 3 TIG welding torch 4 Torch switch 5 Base material connection cable 6 Base material 7 GMA welding power supply 8 GMA welding wire feeding device 9 GMA remote control box 10 Wire inching switch 11 Control device 12 Wire feeding Switch 13 Welding wire conduit 14 Nozzle 15 TIG welding wire

Claims (2)

[Claims] 1. A TIG welding power supply, a welding torch connected to the TIG welding power supply via a torch cable, a torch switch attached to the welding torch and connected to the TIG welding power supply, and a TIG welding power supply. In a semi-automatic TIG welding device including a base material connection cable for connecting a base material and a TIG welding wire feeding device, the TIG welding wire feeding device includes a gas metal arc welding power supply, A gas metal arc welding wire feeder connected to a welding power source; a welding wire conduit mounted on the gas metal arc welding wire feeder for guiding a TIG welding wire to be fed; The wire nozzle attached to the tip and the TIG welding wire mounted on the wire feeder for gas metal arc welding are printed Remote control box for gas metal arc welding connected to the power supply for gas metal arc welding, a contact connected to a wire inching switch terminal of the remote control box for gas metal arc welding, and opening and closing times of the contact. A control device having a timer for setting each time and a circuit for repeatedly opening and closing the contacts in accordance with the set time of each timer, and a wire feed switch attached to the wire nozzle for turning on and off the control device. A semi-automatic TIG welding device, characterized in that: 2. A power supply for gas metal arc welding, a wire feeder for gas metal arc welding connected to the power supply for gas metal arc welding, and a feeder mounted on the wire feeder for gas metal arc welding. A welding wire conduit for guiding a TIG welding wire to be used, a wire nozzle attached to the tip of the welding wire conduit, and the gas metal for inching the TIG welding wire mounted on the wire feeder for gas metal arc welding. A remote control box for gas metal arc welding connected to a power supply for arc welding, a contact connected to a wire inching switch terminal of the remote control box for gas metal arc welding, and an opening time and a closing time of the contact, respectively. A control device having a timer and a circuit for repeating opening and closing of a contact corresponding to a set time of each timer; 2. The TIG welding wire feeding device for a semi-automatic TIG welding device according to claim 1, further comprising a wire feeding switch attached to the ear nozzle for turning on / off the control device.