JPH11207466A - Rotary welder gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the welding work by providing an operation part with an oscillation indication part for oscillating a welding electrode in horizontal direction thereby keeping welding point at the desired position. SOLUTION: A welding electrode is rotated by motor 8. The rotation of the motor 8 is controlled by a control circuit 29. The angle of rotation in horizontal direction and the pulse number of the welding electrode are set by an angle setting switch 36. The angle of rotation is <=360 deg.. The revolving speed of the motor 8 is set by a revolving speed setting switch 22. A start/stop switch 25 of a power motor is depressed to drive the motor 8. When the welding electrode is rotated at the set angle, the agreement signal is transmitted from an agreement circuit 38, and the control circuit 29 transmits the brake signal. Transistors TR1-TR4 of a drive circuit 28 are switched to drive the motor 8 in the reverse direction. The rotation mode between the one-way rotation and the horizontal oscillation is switched by a mode switch 46 to improve the efficiency of the welding work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to civil engineering, steel,
The present invention relates to a rotary welder gun for overlay welding for repairing a metal surface of various types of machine parts and tools used in mining and railway industries.

[0002]

2. Description of the Related Art In a conventional rotary welder gun for overlay welding by spark discharge, when a welding rod is brought close to a work surface to be repaired, a spark discharge occurs between the two and the welding rod is melted by the spark discharge. Spraying is performed on the surface of the conductive work in a shield atmosphere of argon gas. The welding rod is melted and charged by the heat of the spark discharge, is attracted to the surface of the work, collides with the surface of the work, and a part of the welding material bites to form a buildup layer. At this time, since the welding rod is rotating in one direction,
Prevents the tip of the welding rod from fusing to the surface of the work,
Overlay work can be done smoothly. Furthermore, the build-up layer formed becomes uniform. (See JP-A-6-269936)

[0003]

The overlay welding of the prior art is
While rotating the welding rod of the welder gun, it comes into contact with the repair surface of the iron work (base material) and is welded, and the welding electrode, which is a metal electrode, is continuously melted to form a molten metal and the repair surface is built up. When the workpiece is rotated in one direction about the axis and comes into contact with the welding point of the work at a predetermined angle in the advancing direction, it shifts in the rotating direction, so hold the welder gun by hand so that the welding rod does not escape from the desired welding point I had to be. In particular, in the case of a long operation, it is very difficult and difficult to prevent the welding rod from escaping from a desired welding point.

The present invention has been made in view of such problems of the prior art, and has as its object to maintain a welding point of a rotary welder gun within a desired position (area) by welding. An object of the present invention is to provide a rotary welder gun that facilitates work and increases the efficiency of welding work.

[0005]

In order to achieve the above object, a rotary welder gun according to the present invention comprises a spindle for holding a welding rod in a case, a motor for rotating the spindle, and welding to the welding rod. A welding cable for supplying current and a gas cable for supplying gas to the welding rod side are provided, and an operation unit for instructing welding conditions is provided on the surface of the case, and the welding rod is rotated under desired conditions. In a rotary welder gun for spark welding and build-up welding to a workpiece, an operation unit is provided with a left-right swing instruction unit for a welding rod.

[0006] A left-right swing instruction portion for the welding rod and a switching instruction portion for switching between one-way rotation and left-right swing are provided.

[0007] The left and right swing instructing unit comprises a welding rod rotating direction instructing unit and an angle setting unit.

The left and right angles of the angle setting section are set to 360 ° or less.

The left and right angles of the angle setting section are different from each other.

[0010] The rotation direction at the start of the welding rod was set.

In the case, a control circuit for controlling signals from the respective switches, a drive circuit for instructing the rotation direction and the number of rotations of the motor by a command from the control circuit, a counter for reading the rotation signal of the motor, and a signal for the counter The control circuit compares the predetermined left and right rotation angle signals and instructs the control circuit to brake the rotation of the motor when they match, and instructs the control circuit to reverse the rotation signal of the motor when there is no predetermined time. And a no-signal detection circuit.

When the welding rod of the rotary welder gun configured as described above is brought close to the work, welding can be performed with the welding rod substantially fixed at a desired welding point position.

By changing the swing angle of the welding rod, the rod can be moved at an arbitrary welding speed.

The swing range of the welding rod can be set arbitrarily during welding.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The welder gun of this embodiment is for manual welding, and a case 1 is formed with a grip 1b held by hand and an opening 1a for projecting a welding rod. In FIG. 6, a spindle 1 for rotating and holding the welding rod 20 is provided in the case 1 of the welder gun in order to project the welding rod 20 out of the case 1 from the lower surface of the opening 1a.
4 is vertically supported on the lower surface. Spindle 1
4, the motor 8 is disposed so that the rotation axis of the motor 8 is substantially perpendicular to the rotation axis of the spindle 14 (slightly inclined). A gear for transmitting rotation of the motor 8 to the spindle 14 is provided between the motor 8 and the spindle 14. In this embodiment, the transmitting gear is the rotation of the motor 8 and the rotation of the motor 8.
A worm gear 12 having a gear 10 meshed with a drive gear 42 at its end and transmitting rotation to the spindle 14, and a worm wheel 13 fixed to the spindle 14 for transmitting rotational power from the worm gear 12 to the spindle 14 at a reduced speed.
It is. The spindle 14 has a hollow portion 15 in the center of the spindle 14 through which a shielding gas passes, and a welding rod 20 is inserted into the outer end of the spindle 14. The inner end of the spindle 14 is connected to an L-shaped tube that is loosely fitted to the inside diameter of the spindle 14. At the outer end of the spindle 14, a welding rod 20 can be replaced.
A chuck 16 that rotates in the same manner as the spindle 14 and rotatably holds the welding rod 20 is provided. In the figure, 2 is a comprehensive cable, 3 is a power cable for welding, 4 is a general cable, 5 is a motor cable, 6 is a gas tube, and 9 is a motor drive shaft.

As shown in FIGS. 5 and 6, on the upper surface of the case 1, a display unit 19 for a control unit 18 displayed on the upper surface and a circuit board 17 for an operation unit 21 incorporating a CPU and circuit elements are provided. Is installed. The operation unit 21 includes a start / stop switch 25 of a power motor, which is a switch for opening and closing a welding operation for controlling the welding power to the welding rod 20, the rotation of the welding rod 20, and the opening and closing of the gas flow, and the present invention. The right and left switch 40, which is a left / right switching instruction unit of the motor 8, and the rotation angle setting of the welding rod 20, that is, the pulse of the motor 8 are switched. An angle switch 36 which is a setting unit, a mode switch 46 of an instruction unit capable of switching between one-way rotation and left / right rotation of the welding rod 20, that is, a switch between one-way rotation and left / right swing of the motor 8, and a rotation switch of the motor 8. A set switch 45 for determining various setting conditions is provided. If the mode switch 46 is not pressed beforehand, the mode switch 46 is set so as to preferentially enter the left / right swing mode. When the user wants to change to the one-way rotation mode, ie, one-way rotation, the mode switch 46 is pressed to switch to the one-way rotation mode.
When the button is further pressed, the mode is switched to the left / right swing mode. That is, the mode is switched each time the button is pressed. The left / right changeover switch 40, which is the direction of rotation of the welding rod 20, ie, the direction of rotation of the motor 8, is turned forward, for example, clockwise, and further turned counterclockwise to rotate counterclockwise. Each time, the rotational position changes. Indicators A and B above switch 40 indicate the direction of rotation. When the angle setting switch 36, which is an angle setting unit, is pressed, the angle is set from the preset right rotation angle of the welding rod 20, and then the left rotation angle is set. In this case, one pulse (180 ° rotation of the motor)
The minimum resolution corresponds to the rotation angle 9 ° of the welding rod 20, and a preset standard value of the rotation angle of the welding rod 20 is set. An angle display unit 44 is provided at an upper portion, and a standard value of the rotation angle of the welding rod 20 is displayed. The value rounded to the upper two digits of the standard value is displayed as a number. For example, if it is displayed as 30, it indicates an angle of 300 °, and the welding rod 20 is 29 degrees in one direction.
It shows the set value that oscillates at 7 ° (9 ° × 33 pulses). Even if the rotation angle of the welding rod 20 is set arbitrarily, since the pulse resolution is 9 °, the rotation angle of the welding rod is a multiple of 9, ie, 9
.Times.N (N = 1, 2, 3, 4,...), And if the rotation angle of the welding rod 20 is 293.degree. 302 ° to 310 ° are collectively set to 306 °. Below the angle setting switch 36, there is provided a set switch 45 for determining the left-right rotation angle of the welding rod 20 set to a value other than the standard value, and when pressed (Y), the set contents are determined. When the button is not pressed (N), the set contents other than the standard are erased and the state returns to the standard value before the setting.
A switch and a display 22 for setting the rotation speed of the welding rod 20, that is, a rotation speed of the motor 8, and a switch and a display 23 for setting the welding current by the number of capacitors are provided above the angle display unit 44. A switch and a display 24 for selecting and setting the charge / discharge frequency are provided.

As shown in FIG. 1, a magnet 30 having N and S poles is provided on the outer periphery of a rotating shaft 9 of a motor 8 in a case 1, and a magnetic sensor 31 is arranged outside the magnet. And
The rotation pulse of the motor 8 is detected by the magnetic sensor 31. The rotation speed of the motor 8 is 6000R in this example.
The rotation speed of the spindle 14 that holds the welding rod 20 and rotates together with the welding rod 20 is 300 RPM, and the reduction ratio is 1/20. The pulse of the motor 8 is
As described above, the rotation angle of the spindle 14, that is, the rotation angle of the welding rod 20, is equal to 9 °. Actually, since the motor 8 does not stop suddenly due to inertia, the power supply to the motor 8 is turned off, and at the same time, the electromagnetic brake is applied by the circuit. . The power is turned off when the inertia pulse is reduced. The left and right rotation of the motor 8 of the present invention, that is, the welding rod 20
The circuit that controls the left and right rotation of the display is a circuit board 1 inside the display unit.
7. In this embodiment, the motor 8
The direction of rotation of the welding rod and the direction of rotation of the welding rod are not called forward / reverse rotation, but are used unified as left / right rotation.

Next, control of the left and right rotation of the motor 8 will be described with reference to FIGS. FIG. 1 is a block diagram of a left-right rotation system of a motor. 25 is a start / stop switch, 27 is a power supply, 28 is a drive circuit for the motor 8, 29 is a control circuit, 31 is a magnetic sensor, 32 is a waveform shaping circuit, 33 is a no-signal detection circuit, 34 is a counter,
35 is a preset counter, 36 is an angle setting switch, 37 is a left / right pulse number generation circuit, 38 is a coincidence circuit,
0 is a left / right switch, 45 is a set switch, 46
Indicates a mode switch, 44 indicates an angle display unit, and 47 indicates a display unit driver. In the present invention, the mode at the time of start is set in advance in the left and right swing mode, the rotation direction of the motor is clockwise, and the left and right rotation angle of the motor is set at a standard angle. Operates at the set value. TR1, TR2, TR3, TR
Four transistors and diodes D1, D2, D3, and D4 are provided, and an intersection of OUT1 and OUT2 is formed in the circuit. H1, H2, L1, 2 are control circuits 2
9 to the transistors TR1, TR of the drive circuit 28
2, connection lines to TR3 and TR4. A selects a rotation speed signal from the rotation speed setting switch 22 to the control circuit 29 to determine the rotation speed of the motor, and C selects a signal sent from the magnetic sensor 31 to the waveform shaping circuit 32 and selects a counter 34
And a sensor signal to be sent to the no-signal detection circuit 33, b is an angle setting pulse number selection signal sent from the angle setting switch 36 to the left and right pulse number generating circuit 37 via the control circuit 29, and e is a preset counter 35 from the control circuit 29. An initialization signal for resetting, and when the signals from the preset counter 35 and the counter 34 match, a matching circuit 38
From the control circuit 29 to the control circuit 29, and from the control circuit 29 to the drive circuit 28, a match signal for sending a combination signal for braking and stopping the rotation of the motor 8; It is a left / right switching signal sent to the left / right pulse number generation circuit 37 via the left and right. G is an inversion signal for inverting the motor 8. The inversion signal indicates that when the rotation of the motor 8 decreases, the period of the sensor signal C becomes longer when the period of the sensor signal C is equal to or longer than the period set in the no-signal detection circuit 33.
Send to 9 A control signal is sent from the control circuit 29 to the drive circuit 28 so that the motor 8 rotates in the reverse direction. A,
B is a signal for displaying the rotation direction of the motor 8 on the indicator above the left / right switch 40 as shown in FIG. 5, where A represents right rotation and B represents left rotation. FIG. 2 is a timing chart of the left and right rotation of the motor 8, showing + · − or on / off at each line and each intersection.
Or on, L represents-or off, and the right direction represents the passage of time. The sensor signal c emits a predetermined number of pulses. The inversion signal d indicates that one pulse signal is issued at a predetermined interval to the coincidence signal. TR and TL are drive times of the motor 8 that match the rotation angle of the welding rod 20, and N
R and NL are the pulse numbers. TB indicates a brake time for stopping the motor 8. TS is the drive time of the motor 8 that was forcibly stopped before reaching a predetermined pulse of the motor 8, and NS is the number of pulses at that time. FIG. 3 is a flowchart showing switching between the one-way rotation mode and the left / right swing mode of the motor 8, and FIG.
4 is a mode table showing H = (+) and L = (−) of the main part of the left-right rotation of FIG.

Next, the operation of this embodiment of the present invention will be described. First, the power of a welding device with a welder gun (not shown) is turned on. In the initial state when the power is turned on, the following contents are set. The start / stop switch 25 of the power motor is in a sensitive state (the motor 8 rotates when the switch is pressed at any time, and the motor 8 stops when the switch is pressed during the rotation). The mode is set to the left and right swing mode (1), and the rotation direction of the motor 8 is set to right rotation. The left / right switching switch 40 of the motor 8 is in a sensitive state (the left / right switching can be performed by pressing the switch at any time). The angle setting switch 36 is in a sensitive state (can be changed by pressing the switch at any time, but a standard value is set in advance), and the right angle has priority first. The angle display section 44 displays a standard angle of right rotation. Angle setting switch 36
Is in a sensible state (an angle input or selection can be made by pressing a switch), the angle display section 44 is in a right display state, and the left-right rotation angle corresponding to a standard right rotation angle (300 °) prepared in advance is set to 1 The number 30 converted to / 10 is displayed. When the set switch 45 is pressed (Y) and switched, a numerical value 27 is set in which the left-right rotation angle corresponding to the standard left rotation angle (270 °) prepared in advance is reduced to 1/10. In the preset counter 35, values of the standard pulse numbers 33 and 30 corresponding to the right rotation angle and the left rotation angle are set.

Next, a case where the value is set to a value other than the standard value will be described. First, the left and right rotation angles of the welding rod 20 are set by the angle setting switch 36. Usually, clockwise rotation is displayed first. The angle display section 44 displays the angle of the standard welding rod 20. When changing the angle, the angle setting switch 36 is depressed and the angle display unit 44 is viewed and determined, and one of the left and right rotation angles (the pulse number TR) is set. In order to set the pulse number TR, if the angle setting switch 36 is kept pressed, the number of indications is incremented at predetermined intervals, and a desired angle is input or selected and set. Subsequently, when the set switch 45 is pressed (Y), the data is determined and the mode shifts to the left / right swing mode (2). Further, when another rotation angle (number of pulses TL) is operated and set in the same manner as described above and the set switch 45 is pressed (Y), the data is determined.
The angle display unit 44 displays the number of angles (a multiple of 9) corresponding to the number of pulses of TR and TL. For example, if the number of angles is 3
0 means 300 °, 1 pulse = 9 ° to 9 ×
33 = 297 °, if the rotation angle of the welding rod is 297 °, 33
It becomes a pulse. That is, 1 pulse = 9 °, 300 ° / 9
° = 33 (pulse). In this case, it is not determined whether the number of left and right pulses is left or right. The number of NRs and the number of NLs are compared, and the larger number, that is, the larger number of pulses is the initial rotation direction of the left-right rotation. If the rotation direction is set to the right, the rotation angle of the right rotation at the start is increased, and the rotation angle of the left rotation, which is reversed next, is reduced. To set the initial rotation direction to the left, TR (left rotation) and TL (right rotation) are switched so that the rotation angle of left rotation becomes large. Note that the left and right angles different from NR and NL are set as follows.
This is because the welding rod 20 is rotated in a direction that is larger by the difference between the angles to reduce the number of welding rods on average. After the above setting, when the start / stop switch 25 is pressed, the motor 8 operates. Then, clockwise rotation (TR), switching (T
B), left rotation (TL), switching (TB), right rotation (T
R), switching (TB), counterclockwise rotation (TL)... When finished, start / stop switch 25
Press to stop at rotation (TS). In order to increase or decrease the rotation of the motor 8 during operation, the rotation speed setting switch 22 may be operated.

Next, switching between the left / right swing mode and the one-way rotation mode and the change of the set value of the left / right swing mode are shown in FIG.
This will be described. The mode switching will be described. When the power is turned on, the initial setting mode is the left / right swing mode (1) as shown in FIG. When it is desired to switch the left / right swing mode to the one-side rotation mode, the mode switch 46 is pressed to switch to the one-side rotation mode. The switching can be performed before the motor is operated or while the motor is rotating. Conversely, when it is desired to change the one-way mode to the left / right swing mode, the mode can be switched during rotation of the motor by pressing the mode switch 46 in the same manner. Next, switching of the rotation direction in the left / right swing mode will be described. When the power is turned on, the mode becomes the left / right swing mode (1), and one standard angle number is displayed. If it is to be changed, the angle setting switch 36 is depressed while looking at the angle display section 44 as described above, the setting is made, and the set switch 45 is depressed (Y) to confirm. If there is no change, if the set switch 45 is pressed (Y), the process proceeds to the next step. However, when it is desired to change the set value, the angle can be set by the angle setting switch 36 without pressing the set switch 45 (N). After setting the left and right swing mode for both left and right,
When it is desired to change the angle setting value of the latter left-right swing mode, the set switch 45 is pressed (N), and the mode shifts to the latter left-right swing mode (2), where the angle set value may be reset again. . When the set switch 45 is pressed (Y), the next left / right swing mode, that is, the first left / right swing mode (1)
Move on to When the start / stop switch 25 is pressed at any time after the setting, the motor 8 operates.

Next, the operation of rotating the welding rod 20 in the left-right direction, ie, switching the motor 8 in the left-right direction will be described with reference to FIGS. 1, 2 and 4. FIG. When the power / motor start / stop switch 25 is pressed, a preset counter 35
The NR in which the number of pulses is set in advance is transmitted. Further, H1 and L2 of the drive circuit 28 are set to H, TR1 and TR4 are turned on, OUT1 is set to +, OUT2 is set to-, and the current from the power supply 27 forms a circuit of TR1, the motor 8, TR4, and the power supply 27 to form a motor. 8 is rotated clockwise (clockwise in the figure).
That is, first, the welding rod 20 is rotated to the right. When the motor 8 rotates, the magnet 30 attached to the rotating shaft 9 of the motor rotates at the same time, a sine wave rotation pulse is detected by the magnetic sensor 31 fixed outside the rotating shaft 9, and a rectangular wave is formed by the waveform shaping circuit 32. Generates a sensor signal c. The sensor signal c is counted by the counter 34, and the number (N
Continue clockwise rotation of the motor until it matches R). That is, the rotation angle (oscillation angle) of the welding rod 20 to be set is reached.
When the number matches the set number (NR), a match signal is output from the matching circuit 38 and a control circuit 29 sends a brake signal to stop.

When the brake signal is sent, the control circuit 2
At 9, an instruction is issued to change H1 to L and L1 to H. In the drive circuit 28, TR2 and T are set at H of L1 and L2.
R4 turns ON, OUT1 and OUT2 become-,
The circuit is cut off, and no current flows from the power supply 27. However, the motor 8 rotates by inertia, and the motor 8 becomes a generator. The generated back electromotive current passes through TR4 from OUT2, passes through D2 of TR2 to OUT1, and The electromagnetic brake (TB) is applied from OUT1 through TR2 to TR2 via D4 of TR4, and the motor 8 is substantially stopped, and the sensor signal c disappears. When there is no sensor signal C for a predetermined time or more, the non-signal detection circuit 33 sends an inverted signal to the control circuit 29 side.

In response to the inverted signal, the counter 34 and the preset counter 35 are cleared once, and the NL number prepared in the left / right pulse number generation circuit 37 is sent to the preset counter 35. Also, H2 of the drive circuit 28 is set to H, L
2 is set to L, TR3 and TR2 are turned on, OUT2 becomes +, OUT1 becomes-, and the current from the power supply 27 is TR3,
The circuit of OUT1, TR2 and power supply 27 is formed, and the motor 8 is rotated left (counterclockwise). That is, the welding rod 20 is rotated to the left. When the motor 8 rotates, the magnet 30 attached to the rotating shaft 9 of the motor rotates at the same time, a sine wave rotation pulse is detected by the magnetic sensor 31 fixed outside the rotating shaft 9, and a rectangular wave is formed by the waveform shaping circuit 32. Generates a sensor signal c. The sensor signal c is counted by the counter 34, and the preset counter 3
The motor continues to rotate left until it reaches the number (NL) set to 5. That is, the rotation angle (oscillation angle) of the welding rod 20 to be set is reached. When it matches the set number (NL),
The coincidence signal is output from the coincidence circuit 38, and the control circuit 29 sends a brake signal to stop.

When the brake signal is sent, the control circuit 2
At 9, a command is issued to change H1 to L and L2 to H.
In the drive circuit 28, TR2, TR4
Is turned on, OUT1 and OUT2 both become-,
The circuit is cut off, and no current flows from the power supply 27. However, the motor 8 rotates by inertia, and the motor 8 becomes a generator. The generated back electromotive current passes through TR4 from OUT2 and TR2.
The electromagnetic brake is applied in a loop from OUT2 to OUT1 through OUT2, from OUT2 to TR2, and from TR4 to D2 of D4, so that the motor 8 stops substantially and the sensor signal c disappears. If there is no sensor signal C for a predetermined time or more, the no-signal detection circuit 33 controls the inverted signal
Send to the side.

During the right and left swing welding of the welding rod 20, the power
By pressing the start / stop switch 25 of the motor,
The control circuit 29 receives a stop signal, forcibly sets H1 of the drive circuit 40 to L and L1 to H, sets OUT1 to-, applies a brake, and stops the motor 8. Therefore, all the operations are stopped, and the operation is forcibly stopped. Then, an inverted signal is output, and each circuit is set to an initial state, that is, a state before setting by a stop signal of the control circuit 29 and an AND signal (not shown). When the mode switch 46 is pressed during the lateral swing welding of the welding rod 20, the mode is switched, and the speed can be changed on the way by pressing the rotation speed setting switch 22.

If a data storage unit is provided in the circuit, even if the power is once turned off and then turned on again, the welding rod and the rotation conditions used so far are retained and can be reused.

In order to change the model from the one-way rotation system to the right and left swing system, the mechanical system has a complicated structure and tends to be large in size, and a large investment and time are required. Since the construction can be made by changing the electronic circuit part with almost no change in the mechanical part, the economic effect is very excellent.

The structure of the present invention other than the above embodiment will be described below. Above is the swing of the welding rod caused by the left and right rotation
Although operated by an electronic circuit, a mechanical structure may be adopted. Although the above-mentioned swing welding has been described for manual welding, it is needless to say that the swing welding may be employed in an automatic device. The swing range (rotation range) of the welding rod is described as being within 360 °, but may be 360 ° or more. For example, the swing range of one rotation of the welding rod may be 450 ° rotation, and the swing range of the other rotation may be 360 ° rotation. Further, although the left and right rotation angles of the welding rod are described as being different from each other in the left and right directions, the left and right may be the same angle. The rotation of the welding rod, that is, the number of rotations of the motor is detected using a magnetic sensor, but the current signal of the motor may be directly replaced with a pulse and detected. The switching element of the drive circuit is described as a transistor (TR).
It may be replaced with a switching element such as an OSFET. The angle setting and the angle display may be the pulse number setting and the pulse number display. The mode switch for switching between the one-way rotation and the left-right swing may be omitted, and a structure dedicated to the left-right swing method may be used.

[0030]

Since the present invention is configured as described above, the following effects can be obtained.

Since the welding rod is provided with a one-way rotation system and a left-right swinging system, the welding rod can be freely selected, and a welding operation corresponding to a change in welding conditions such as the shape and size of a mold can be performed.

Since the welding rod is rocked and welded, there is no fear that the welding rod comes close to the work and is repelled and repelled from the welding position at the time of contact, and is almost stationary at a desired welding position. Can be reliably welded in the state.

Since the operation unit is provided with a welding rod swing instruction unit, desired welding setting conditions can be easily set with a switch at hand. Moreover, the settings are all simple with a pressing operation.

By changing the swing angle, any welding movement can be performed.

Since the left and right swing range of the welding rod can be set arbitrarily, it is easy to match the welding habit of the operator.

At the start of the welding operation, the operation can be started from the left or right in accordance with the habit of the operator.

When the mechanism for swinging the welding rod is performed by an electronic circuit or the like in the case, the size of the welder gun can be reduced, and the welding operation can be easily performed.

Since the present apparatus is light and easy to operate, it can be easily used even by non-experts and can perform overlay welding with high accuracy.

[Brief description of the drawings]

FIG. 1 is a system block diagram of left and right rotation of a motor.

FIG. 2 is a timing chart of right and left rotation of a motor.

FIG. 3 is a flowchart illustrating switching between a unidirectional rotation mode and a left-right swing mode of a motor.

FIG. 4 is a mode table.

FIG. 5 is an overall perspective view of a welder gun of the present invention.

FIG. 6 is a general center cross-sectional view of a welder gun.

[Explanation of symbols]

 Reference Signs List 20 welding rod 21 operation unit 22 rotation speed setting switch 25 start / stop switch of power motor 28 drive circuit 29 control circuit 31 magnetic sensor 32 waveform shaping circuit 34 counter 35 preset counter 36 angle setting switch 37 left / right pulse number generation circuit 38 coincidence Circuit 40 Left / right switch 44 Angle display 45 Set switch 46 Mode switch

Claims (7)

[Claims] A spindle for holding and rotating a welding rod, a motor for rotating the spindle, a welding cable for supplying a welding current to the welding rod, and a gas cable for supplying a gas to the welding rod are provided in a case. , On the surface of the case,
A rotary welder gun that has an operation unit for instructing welding conditions, rotates the welding rod under desired conditions, sparks discharge, and builds up welding on the work. Rotary welder gun characterized by having a section. 2. A case, a spindle for holding and rotating the welding rod, a motor for rotating the spindle, a welding cable for supplying welding current to the welding rod, and a gas cable for supplying gas to the welding rod side are provided in the case. , On the surface of the case,
A rotary welder gun that has an operation unit for instructing welding conditions, rotates the welding rod under desired conditions, sparks discharge, and builds up welding on the work. A rotary welder gun characterized by comprising an indicator and an indicating portion capable of switching between one-way rotation of the welding rod and left and right swing. 3. The rotary welder gun according to claim 1, wherein the left / right swing instruction unit includes a welding rod rotation direction instruction unit and an angle setting unit. 4. The rotary welder gun according to claim 3, wherein the left and right angles of the angle setting section are 360 ° or less. 5. The rotary welder gun according to claim 3, wherein the left and right angles of the angle setting section are different from each other. 6. The rotary welder gun according to claim 1, wherein the rotation direction at the time of starting the welding rod can be set. 7. A control circuit for controlling each switch signal and various signals in a case, a drive circuit for instructing a rotation direction and a rotation speed of the motor by a command of the control circuit, and a counter for reading a rotation signal of the motor. A counter circuit is compared with a predetermined left and right corner signal, and a match circuit instructing a control circuit to brake the rotation of the motor when they match, and a reverse circuit when the motor rotation signal is not present for a predetermined time. 7. The rotary welder gun according to claim 1, further comprising a non-signal detection circuit for instructing the control circuit.