JP3185500U - Torch for TIG welding equipment - Google Patents

Abstract

[PROBLEMS] To ensure sufficient welding quality even in welding work where the welding environment is poor, such as welding work of workers with insufficient maturity for TIG welding, or in narrow places where visibility is not sufficiently reached. A torch for TIG welding that can be performed is provided.
In the position control device 44, when a TIG welding operation is started, a touch start is performed, and after this current flows, an arc voltage has a position information indicating a distance magnitude. You can see that The position controller 44 controls the position of the torch electrode so that the voltage of the AVC device becomes constant. That is, if the distance increases and the voltage increases, the position changes in the direction of decreasing distance, and the position change also stops when the voltage reaches the target value. Thus, by making a state in which there is no change in the distance between the torch electrode and the workpiece 52, the welding operation is assisted and the welding quality is ensured.
[Selection] Figure 5

Description

The present invention relates to a torch used when performing manual welding using a TIG welding apparatus.

FIGS. 6 to 9 show the relationship between a welding apparatus and a torch for a manual welding apparatus that are generally used conventionally. FIG. 9 is a schematic diagram showing a relationship between a TIG welder, a TIG welder, and a torch for a TIG welding apparatus. In FIG. 9, the TIG welding machine 115 includes a power supply device 116 for supplying welding power, a cooling water device 117 for cooling the torch electrode, and a shield gas device 118. Then, the output of the power supply device 116 is connected to a cooling water supply pipe 113 made of a copper pipe, through which the electrode 101 is conducted through the torch body 102, the electrode support 103, and the collet 104 shown in FIG.

The cooling water device 117 supplies cooling water for removing Joule heat generated in the torch main body 102 and the electrode 101 and heat transmitted during welding, and drains the cooled water. The shield gas device 118 is for supplying a shield gas for covering the welded portion of the electrode 101 and the workpiece 120 with an inert gas at the time of welding to prevent the mixing of oxides.

The AVC apparatus stabilizes an arc generated between the electrode 101 and the workpiece 120 during welding. To briefly describe the AVC apparatus, when starting welding, the main switch of the TIG welder 115 is turned on in FIG. 9, and the shield gas apparatus 118, the cooling water apparatus 117, and finally the power supply apparatus 116 are activated. The welding preparation is completed, the torch electrode 101 is brought into contact with the workpiece 120, and the arc is generated at the moment when the torch electrode 101 is gently raised upward from this state, and the voltage at this time is detected at the same time. If the distance to the workpiece 102 is increased during manual welding and the current of the torch electrode 101 is decreased, the voltage is increased to stabilize the arc. If the distance is reduced and the current is increased, the voltage is lowered to control the current to be constant. Thus, for the first time at the start-up, the voltage is controlled so as to be a constant current corresponding to the distance based on the voltage when the arc is generated.

FIG. 6 is a cross-sectional view of a TIG welding torch generally used conventionally. 7 is a cross-sectional view taken along the line EE of FIG. 6, and FIG. 8 is a cross-sectional view taken along the line FF. The cooling water supply pipe 109 and the cooling water drain pipe 110 are connected to the cooling water device 117 described above. The shield gas pipe 111 is connected to the shield gas device 118. The cooling water supply pipe 109 is made of a copper pipe coated with an insulator, and is connected to the output terminal of the power supply device 116 so that welding electricity can be passed through the copper pipe. The above-described cooling water supply pipe 109, cooling water discharge pipe 110, and shield gas pipe 111 are brazed to the torch body 102. Further, the electrode support 103 and the torch cap 106 are screwed to the torch body 102. A torch electrode 101 is fastened and fixed to the torch body 102 by a collet 104 and a collet fastener 105 on the electrode support 103. A nozzle 108 is provided so as to wrap around the outer periphery of the electrode support 103 and is fastened to the torch body 102.

The cooling water supply pipe 109 is connected to a sealed ring-shaped groove provided in the torch main body 102, and the ring-shaped groove has a cooling water slightly spaced from the mounting position of the cooling water supply pipe 109. A drain pipe 110 is connected. The torch cap 106 is made of an insulating material, covers the torch electrode 101, and prevents electric leakage and electric shock while the torch electrode 101 is energized.

The torch body 102 is mounted in an insulating holder 107 made of an insulating material, and the lower portion of the insulating holder 107 covers the cooling water supply pipe 109, the cooling water drain pipe 110, and the shield gas pipe 111, and at the time of welding. It is operated so as to hold a certain clearance with respect to the torch electrode 101 and the work 120 by grasping here.

The cooling water supply pipe 109, the cooling water drain pipe 110, and the shield gas pipe 111 are provided with a cooling water supply pipe joint 112, a cooling water drain pipe joint 113, and a shield gas pipe joint 114, which are not shown in the figure. The main pipes of the welder 115, that is, the cooling water supply pipe 126 and the shield gas main pipe 127 are connected. And it has sufficient length so that the softness | flexibility which does not restrain the movement of the insulation holder 107 which supports the torch main body 102 may be maintained.

When performing TIG welding, as described above, the power supply device 116, the cooling water device 117, and the shield gas device 118 of the TIG welding machine 115 are activated and the valves and valves are activated, as shown in FIG. Is held through the welding glove, brought close to the workpiece 120, an arc is generated, the welding glove is put on the other hand in the same manner, the welding rod 121 is held, and it is inserted into the arc and melted. We will proceed with welding. At this time, due to the current flowing through the torch electrode 101, the torch electrode 101 and the torch main body 102 are heated by Joule heat, and the radiation heat of the arc is also added, but is cooled by the cooling water flowing through the torch main body 102. The shield gas supplied is cooled by cooling water flowing through the torch body 102. The supplied shielding gas passes from the center of the torch body 102 through the front electrode support 103 and the annular narrow gap formed by the torch electrode 101, through the slit in the collet 104, and through the insulating cover 108. And flows toward the work 120 and is injected. The shielding gas covers the molten metal being welded, prevents contact with the surrounding air, and prevents oxidation.

Since the tip of the torch electrode 101 is worn while continuing the welding operation, at this time, the insulating cover 108 is removed, the collet fastening tool 105 is loosened, the torch electrode 101 is pulled out, the length is adjusted, and the collet 104 is moved to the collet 104. By tightening the fastener 105, the welding operation can be performed in the same posture.

Problems that the device tries to solve

  In the TIG welder 115, AVC is very effective for maintaining the welding quality and welding work efficiency, but it is still not sufficient and depends largely on the skill of the operator. In addition, for example, when welding work is narrow due to welding of pipes, sufficient visibility is not obtained, and it may be necessary to use a mirror and perform the welding work relying on the reflected image. Even if the distance between the torch electrode 101 and the workpiece 120 cannot be made constant, the beat becomes non-uniform, or in some cases, the distance becomes zero, the torch electrode 101 is welded to the molten metal, and the torch electrode 101 is separated. Since a part of the material of the torch electrode 101 remains in the welded portion, it is necessary to continue the welding operation again after removing this with a grinder or the like in order to ensure the welding quality. There is a problem of lowering.

Means to solve the problem

In order to solve the above-described problems, the present invention adopts the following configuration. Integrated torch electrode, welding power line, cooling water supply pipe, and shield gas pipe connected to the torch body so that the torch body can move in the longitudinal direction of the torch electrode against the holder body held by the operator during TIG welding In addition, a sliding mechanism is provided so as to surround the outer peripheral portion of the torch main body, and a structure in which the relative position between the holder main body and the electric actuator is attached to the torch main body can be changed.

The TIG welding operation is performed by controlling the position of the torch body so that the voltage of the torch electrode set by the AVC device of the TIG welding machine is constant at the time of touch start performed when starting the TIG welding operation. When the relative distance between the torch electrode and the workpiece changes and the voltage of the AVC device is about to change, the main body of the torch moves and maintains a distance where the voltage becomes constant so as to stabilize the arc. .

effect

Even if the position of the holder body held by the operator of TIG welding changes carelessly with respect to the workpiece, the position of the torch electrode is automatically controlled, so the distance between the torch electrode and the workpiece is kept constant. Therefore, a stable arc is maintained. As a result, the welding quality is maintained, the arc does not disappear, the torch electrode contacts the workpiece, and the tip of the torch electrode does not weld to the metal being welded.

Inventive embodiment

Hereinafter, embodiments of the present invention will be described with reference to FIGS. The same reference numerals are used in all the drawings.

1 is a cross-sectional view of a TIG welding torch according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is a C-C stage view, and FIG. . FIG. 5 is a diagram showing the concept of the torch and the TIG welding machine and the respective devices in the entire TIG welding device. In FIG. 1, the torch electrode 1 is fastened and fixed to the torch body 2 by the electrode support 3, the collet 4 and the collet fastener 5. The torch body 2, the electrode support 3, the collet 4 and the collet fastener 5 are made of a good electrical conductor material. On the other hand, the rear torch cover 6 is made of an insulating material, and supports the torch electrode 1 and is electrically insulated to prevent an operator from touching the torch electrode 1 and being electrocuted. As shown in FIG. 1, three pipes, that is, a cooling water supply pipe 23, a cooling water drain pipe 24, and a shield gas pipe 25 are brazed to the torch main body 2. The respective pipes are connected to a cooling water device 42 and a shield gas supply device 43 incorporated in the TIG welder 40 shown in FIG. 5 through a cooling water supply pipe joint 27, a cooling water drain pipe joint 28, and a shield gas pipe joint 34. On the other hand, the cooling water main pipe 47 and the shield gas main pipe 46 are connected. Further, the output of the power supply device 41 is connected to the cooling water main pipe 47 and the cooling water supply pipe 23 coming out of the cooling water device 42, and is transmitted to the torch body 2 through this. The above three pipes are attached to the torch main body 2, but a space is provided between these pipes and the holder main body 21 so that the torch main body 2 can move within a limited range in the left-right direction in FIG. The structure is not constrained. The torch main body 2 has a rectangular cross section as shown in FIGS. 3 and 4 and is fitted in a rectangular space formed by the torch main body guide 7 and the torch guide base 9 and is displayed in FIGS. 3 and 4. Although there is not, it is possible to slide in the longitudinal direction of the torch electrode 1 through a small gap. An actuator female screw portion 12 is fastened to the lower portion of the torch main body 2, and an actuator screw rod 13 is screwed. The actuator screw rod 13 is supported by two bearings 29, and a gear 14 is attached to the center of the actuator screw rod 13. The actuator screw rod 13 is rotated by the rotational force transmitted thereto, and the actuator female screw portion 12 can be driven left and right in FIG. 1. . With respect to the gear, the rotation of the electric motor 17 is transmitted to the gear 14 through the gear 16 as shown in FIG. Further, the rotation of the gear 14 is structured such that the shaft of the potentiometer 18 is rotated via the gear 15 and, as a result, a position signal of the actuator female thread portion 12 is generated.

FIG. 6 shows an embodiment of the TIG welder 40 of the present invention. The TIG welder 40 is provided with a position control device 44 for controlling the position of the torch electrode 1 in addition to the power supply device 41, the cooling water device 42, and the shield gas device 43. The power supply device 41 is a device for sending direct current electricity for TIG welding to the torch electrode 1 and controls a touch start voltage connected to a commercial direct current power source. In addition, in order to stabilize the arc during TIG welding work, based on the voltage at the time of touch start, a change in current accompanying a change in the distance between the torch electrode 1 and the work 52 is detected, and the voltage is adjusted. , Voltage control for flowing a constant current is performed. This device is called an AVC device. The AVC apparatus controls the voltage of electricity sent to the torch electrode 1, and this voltage is also position information indicating the magnitude of the distance between the torch electrode 1 and the workpiece 52. Therefore, since constant voltage results in constant distance, a position control device 44 that performs position control using the voltage as a reference signal is provided.

In the position control device 44, when the TIG welding operation is started, a touch start is performed, and after this current flows, the arc voltage has a position information indicating the magnitude of the distance. Recognize. The position control device 44 controls the position of the torch electrode 1 so that the voltage of the AVC device becomes constant. That is, if the distance increases and the voltage increases, the position changes in the direction of decreasing distance, and the position change also stops when the voltage reaches the target value. Thus, by making a state in which there is no change in the distance between the torch electrode 1 and the workpiece 52, the welding operation is assisted and the welding quality is ensured.

Also in the TIG welding torch of the present invention, it is desirable to keep the distance between the torch electrode 1 and the workpiece 52 constant. Position control is performed to keep this distance constant, but there is a range of position control, and this limit cannot be exceeded. In general TIG welding, the condition of the arc and the distance between the torch electrode 1 and the work 52 are visually observed and adjusted manually. However, with the torch according to the present invention, the distance is automatically kept substantially constant. But there are times when it cannot be judged. For this reason, it is necessary to keep the relative distance between the holder body 7 and the workpiece 52 constant, and a guide bar 32 is attached to the holder body 7 of the present invention. Since the base portion of the guide bar 32 is fastened by a guide bar mounting screw 35, the position and direction of the guide bar 32 can be changed as necessary. At the time of TIG welding, the guide rod 32 is applied to the work 52 or the work table 53 for welding, and the holder main body 7 is moved gently so that the distance between the holder main body 7 and the work 52 does not change greatly. Can do.

The shield gas device 43 flows the shield gas before the welding operation and opens and closes a valve for removing air around the torch electrode 1 and the workpiece 52. In the embodiment, the shield gas device 43 is manually operated before and after the welding operation. The device.

The position control device 44 is related to the AVC device of the power supply device 41 as described above, but the position of the torch body 2 is automatically returned to the neutral position when the welding operation is completed. Also, when the main power source is cut off for some reason, the position of the torch body 2 remains at the last position of the welding operation, but when the main switch of the TIG welder 40 is turned on, the torch The position of the main body 2 is automatically returned to the neutral position.

Effect of device

In TIG welding, keeping the distance between the torch electrode 1 and the work 52 correctly constant is indispensable for ensuring quality of TIG welding and working efficiency. Until now, keeping the distance correctly and constant has depended on the skill of the welding operator, but by automatically controlling the position of the torch electrode 1 by the TIG welding machine of the present invention, the distance is corrected and the skill is increased. Is not affected, and high welding quality can be ensured. In addition, when TIG welding work must be performed in a poor environment, sufficient skill cannot be demonstrated, unexpected movement of the holder body occurs, and even if the distance between the torch electrode 1 and the work 52 changes, Since the control device operates and corrects the distance, the quality of TIG welding is maintained, the distance becomes too small, the torch electrode 1 contacts the weld metal, the arc disappears, and the torch electrode No 1 is welded to the welded portion, and work efficiency is not reduced.

It is a cross-sectional view of the torch for TIG welding of the present invention, and is a view showing the configuration of the torch. FIG. 3 shows a cross section BB in FIG. 2. It is a figure which shows the cross section AA of FIG. 1, and is a figure which shows the structure of a torch. It is a figure which shows the cross section BB of FIG. It is a figure which shows the cross section DD of FIG. It is the figure which showed notionally the structure of the welding machine in the case of welding using the TIG welding torch of this invention, and the relationship with a torch. It is a side view of the torch for TIG welding conventionally used. It is a figure which shows the cross section EE of FIG. It is a figure which shows the cross section FF of FIG.

Reference explanation

1 to 5, 1 torch electrode 2 torch body 3 electrode support 4 collet 5 collet tightening portion 6 torch cap 7 torch body cover 8 nozzle 9 torch body guide 10 actuator front support 11 actuator support 12 actuator female thread 13 Actuator screw rod 14 Actuator screw rod gear 15 Potentiometer shaft gear 16 Motor shaft gear 17 Motor 18 Potentiometer 19 Cover 20 Holder body mounting base 21 Holder body 22 Cover mounting screw 23 Cooling water supply pipe 24 Cooling water discharge pipe 25 Shield gas pipe 26 Piping Support 27 Cooling Water Supply Pipe Joint 28 Cooling Water Drain Pipe Joint 29 Bearing 30 Shield Gas Pipe Joint 31 Side Cover 32 Guide Rod 33 Electric Wire Cable 34 Electrical Connector 35 Guide Rod Mounting Screw 40 TIG Welding Machine 41 Power supply device 42 Cooling water device 43 Seal gas device 44 Position control device 45 Position control power cable 46 Shield gas main pipe 47 Cooling water main pipe 48 Torch electrode voltage signal line 50 Power ground wire 51 Welding rod 52 Work 53 Welding work table 54 Commercial power supply connection line 55 Cooling water source connection pipe 56 Shield gas source connection pipe

6, 7, and 8, 101 torch electrode 102 torch main body 103 electrode support 104 collet 105 collet fastener 106 torch cap 107 holder main body 108 nozzle 109 cooling water supply pipe 110 cooling water discharge pipe 111 shield gas pipe 112 cooling Water supply pipe joint 113 Cooling water drain pipe joint 114 Shield gas pipe joint 115 TIG welder 116 Power supply device 117 Cooling water device 118 Shield gas device 119 TIG welding ground wire 120 Work 121 Welding rod 122 Commercial power supply connection line 123 Cooling water connection Pipe 124 Shield gas connection pipe 125 Torch electrode voltage signal line 126 Cooling water supply pipe main pipe 127 Shield gas pipe main pipe

[0023]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a TIG welding torch according to the present invention, showing a configuration of the torch. FIG. 3 shows a cross section BB in FIG. 2.
FIG. 2 is a view showing a cross section AA of FIG. 1 and showing a configuration of a torch.
FIG. 3 is a view showing a cross section BB of FIG. 1;
4 is a view showing a cross section DD of FIG. 1. FIG.
FIG. 5 is a diagram conceptually showing the configuration of a welding machine and the relationship between the torch when welding is performed using the TIG welding torch according to the present invention.
FIG. 6 is a lateral view of a TIG welding torch used conventionally.
7 is a view showing a cross section EE of FIG. 6. FIG.
8 is a view showing a cross section FF of FIG. 6. FIG.
FIG. 9 is a diagram conceptually showing a relationship between a configuration of a welding machine and a torch when welding is performed using a TIG welding torch that has been conventionally used.

Claims (2)

During TIG welding, the electrode and the welding power line and cooling water pipe connected to it are integrated so that the torch body can be moved relative to the holder body of the torch held by the operator, and surrounds the outer periphery of the torch body A sliding mechanism is provided, and an electric actuator attached to the torch body allows the relative position with the holder body to be changed. A potentiometer is provided to detect the relative position, and touch start. A torch for a TIG welding apparatus, wherein the position of the torch electrode is controlled so that the voltage of the electrode output from the AVC apparatus for controlling the TIG welding machine is constant. In the torch for a TIG welding apparatus according to claim 1, a guide rod is provided on the holder body so that the relative position between the holder body and the workpiece can be easily maintained.

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