Battery TIG welder

Abstract

To provide a high-voltage start type battery TIG welder.SOLUTION: A battery TIG welder comprises: a housing; a TIG torch connection part which is provided on the housing; an AC power source connection part which is provided on the housing; a battery cell which is accommodated in the housing; a charging circuit which controls charging of the battery cell by an AC power source connected to the AC power source connection part; a high-frequency high voltage generating circuit which generates a high-frequency high voltage on the basis of electric power charged to the battery cell; and a main control circuit which controls output of a high-frequency high voltage from the high-frequency high voltage generating circuit to the TIG torch connection part. The high-frequency high voltage generating circuit has a high voltage control board, and an induction coil. The high voltage control board has a transformer, a varistor protection circuit and a noise filter circuit on the same board, an electromagnetic shield member is provided on a front side of the high voltage control board, and a communication board is provided on a further front side of the electromagnetic shield member when viewed in a cross direction of the housing.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a battery TIG welding machine that has a built-in rechargeable battery and is capable of performing TIG welding using power charged in the battery. [Background technology]

[0002] Conventionally, battery welding machines have been effectively used when performing welding work in places where there is no AC power source.

[0003] Generally, a battery welding machine includes a portable housing, a welding electrode provided in the housing, an AC power supply connection portion provided in the housing, a plurality of battery cells housed within the housing, a charging circuit housed within the housing and connected to the AC power supply connection portion, which controls charging of the plurality of battery cells by an AC power supply connected to the AC power supply connection portion, and a main control circuit which controls output to the welding electrode based on the power charged in the plurality of battery cells.

[0004] The plurality of battery cells are electrically connected in series, and the overall voltage thereof is monitored (managed).

[0005] Patent applications relating to battery welding machines have been published, for example, in Patent Document 1 and Patent Document 2.

[0006] In addition to the common arc welding method that uses a hand rod (welding rod), TIG welding, which uses an electrode called a TIG torch, is also widely used. TIG welding is primarily suitable for welding stainless steel and aluminum.

[0007] In TIG welding, the tip of the TIG torch is pressed against the base material, electricity is started to flow through the TIG torch, and welding begins by pulling the TIG torch away from the base material while electricity is still flowing between the base material and the TIG torch. This type of welding is called the touch start method.

[0008] However, it has been pointed out that with TIG welding using the touch start method, the tungsten used in the TIG torch is easily caught in the weld area, making it difficult to achieve high welding quality.

[0009] On the other hand, in another mode of TIG welding, welding is started by applying a high-frequency high voltage (for example, about 4 kV) between the base metal to be welded and the TIG torch without bringing them into contact (maintaining a gap of 1 mm to 2 mm). This mode is called the high-frequency high-voltage start method.

[0010] TIG welding, which uses a high-frequency, high-voltage start method, is less likely to involve the tungsten used in the TIG torch in the welding area, making it possible to achieve high-quality welding. However, it has been pointed out that because high-frequency, high-voltage is used, noise control is difficult.

[0011] In an AC-powered TIG welding machine, the high-frequency transformer functions to suppress noise, making it possible to manage noise to a level that does not adversely affect the main control circuit. However, in a battery-powered (DC-powered) TIG welding machine, it is difficult to manage noise simply by installing a noise filter circuit near the high-frequency, high-voltage generating circuit.

[0012] The inventors of the present invention have realized the patented invention of Patent Document 3, which is a configuration that effectively prevents noise from the high-frequency, high-voltage generating circuit from adversely affecting the main control circuit in such a battery-powered (DC-powered) TIG welding machine. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-348778 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-66737 [Patent Document 3] Patent No. 7144857 Summary of the Invention [Problem to be solved by the invention]

[0014] The inventors of the present invention have been studying how to remotely control the battery-powered (DC-powered) TIG welding machine described above. Specifically, they have been studying how to use a smartphone as an operating terminal and Bluetooth (registered trademark) pairing as the communication standard.

[0015] However, it has been found that depending on the placement position of the communication board on which the communication module is mounted, noise from the high-frequency, high-voltage generating circuit can adversely affect the communication module.

[0016] The present invention was invented based on the above findings, and its object is to provide a battery TIG welding machine that can adopt a high-frequency, high-voltage start method by controlling the noise generated when the high-frequency, high-voltage generating circuit is operating to a level that does not adversely affect the communication module. [Means for solving the problem]

[0017] The present invention provides a portable housing, a TIG torch connection section provided in the housing, an AC power supply connection section provided in the housing, a battery cell housed in the housing, a charging circuit housed in the housing and connected to the AC power supply connection section and controlling charging of the battery cell by an AC power supply connected to the AC power supply connection section, a high frequency, high voltage generation circuit housed in the housing and generating a high frequency, high voltage based on power charged in the battery cell, and a main control circuit housed in the housing and controlling output of a high frequency, high voltage from the high frequency, high voltage generation circuit to the TIG torch connection section. the high-frequency, high-voltage generating circuit has a high-voltage control board and an induction coil, the high-voltage control board has a transformer, a varistor protection circuit, and a noise filter circuit on the same board, an electromagnetic shielding member is provided on the front side of the high-voltage control board when viewed in the front-to-back direction of the casing, and a communication board is provided further forward of the electromagnetic shielding member when viewed in the front-to-back direction of the casing, and the communication board has a communication module, a communication interface with the main control circuit, and an antenna for communication with an external device on the same board.

[0018] According to the present invention, the transformer, varistor protection circuit, and noise filter circuit are centrally arranged (with wiring that is approximately the shortest between them) on the same high-voltage control board, thereby effectively absorbing noise generated when high-frequency high voltages are generated. Furthermore, by providing an electromagnetic shielding member between the high-voltage control board and the communication board in the front-to-rear direction of the housing, adverse effects of noise generated when high-frequency high voltages are generated on the communication module can be effectively prevented. Therefore, the battery TIG welding machine of the present invention can achieve communication functions that can withstand the adoption of a high-frequency, high-voltage start method (the risk of malfunction due to noise is significantly reduced).

[0019] The communication board is generally a planar board. The present inventors have discovered that by preparing a noise suppression board as a planar board separate from the communication board, the noise suppression board being made up of an iron plate, a front insulating sheet attached to the front surface of the iron plate, and a back insulating sheet attached to the back surface of the iron plate, and by placing the noise suppression board parallel to the communication board and at a predetermined distance behind the communication board, the adverse effects of noise from behind the communication board can be more effectively suppressed.

[0020] In this case, if the communication board has a rectangular shape in a plan view and the noise suppression plate also has a rectangular shape in a plan view, they can be easily manufactured and handled.

[0021] Furthermore, in this case, if the width of the communication board and the width of the noise suppression board are made the same, their manufacture and handling will be even easier.

[0022] The communication board preferably also has a power supply circuit on the same board. For example, a voltage of about 30 to 60 V can be supplied from the main control circuit to the power supply circuit, which then regulates the voltage to 3.3 V for the communication module. This eliminates the need for a harness connecting the two, compared to when a power supply circuit board is provided separately from the communication board, further reducing noise generation (a harness is required from the main control circuit to the communication board).

[0023] The communication board preferably also includes an acceleration sensor. In this case, the movement of the communication board, i.e., the movement of the battery TIG welding machine, can be remotely monitored based on the detection results of the acceleration sensor. Furthermore, by detecting unexpected movement, the theft prevention effect can be enhanced.

[0024] Preferably, a second electromagnetic shielding member is provided behind the high-voltage control board when viewed from the front to back of the housing, which further effectively prevents noise generated by high-frequency high voltage from adversely affecting the communication board.

[0025] More preferably, a third electromagnetic shielding member is provided above the high-voltage control board when viewed from the top to bottom of the housing, which more effectively prevents noise generated by high-frequency high voltage from adversely affecting the communication circuit.

[0026] In this case, it is more preferable that the electromagnetic shielding member, the second electromagnetic shielding member, and the third electromagnetic shielding member are integrally configured, which simplifies the manufacture and management of these parts and simplifies the assembly of the battery TIG welding machine.

[0027] The electromagnetic shielding member, the second electromagnetic shielding member, and the third electromagnetic shielding member are made of aluminum, which makes it possible to achieve effective noise shielding at low cost. [Effects of the Invention]

[0028] According to the present invention, the transformer, varistor protection circuit, and noise filter circuit are centrally arranged (with wiring that is approximately the shortest between them) on the same high-voltage control board, thereby effectively absorbing noise generated when high-frequency high voltages are generated. Furthermore, by providing an electromagnetic shielding member between the high-voltage control board and the communication board in the front-to-rear direction of the housing, adverse effects of noise generated when high-frequency high voltages are generated on the communication module can be effectively prevented. Therefore, the battery TIG welding machine of the present invention can achieve communication functions that can withstand the adoption of a high-frequency, high-voltage start method (the risk of malfunction due to noise is significantly reduced).

[0029] In particular, when the communication board is a planar board, a noise suppression board consisting of an iron plate, a front insulating sheet attached to the surface of the iron plate, and a back insulating sheet attached to the back surface of the iron plate can be prepared as a planar board separate from the communication board, and by placing this in parallel with the communication board and at a predetermined distance behind the communication board, the adverse effects of noise from behind the communication board can be more effectively suppressed. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic circuit diagram of a battery TIG welding machine according to an embodiment of the present invention. [Figure 2] 1 is a schematic vertical cross-sectional view of a battery TIG welding machine according to an embodiment of the present invention. [Figure 3] FIG. 3 is a schematic front view of the high-voltage control board shown in FIGS. 1 and 2. [Figure 4] FIG. 4 is a schematic side view of the high-voltage control board shown in FIGS. [Figure 5] 1 is a schematic front view of a battery TIG welding machine according to an embodiment of the present invention. [Figure 6] This is the dial portion of the battery TIG welding machine according to this embodiment. [Figure 7] FIG. 2 is a plan view of a communication board of the battery TIG welding machine according to the present embodiment. [Figure 8] FIG. 2 is a plan view of a noise suppression plate of the battery TIG welding machine according to the embodiment. [Figure 9] 3A and 3B are a plan view and a side view of a state in which a communication board and a noise suppression plate of the battery TIG welding machine according to the present embodiment are assembled via a spacer and a screw. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0032] (Overall composition) FIG. 1 is a schematic circuit diagram of a battery TIG welding machine 100 according to one embodiment of the present invention, FIG. 2 is a schematic longitudinal cross-sectional view of the battery TIG welding machine 100 according to this embodiment, FIG. 3 is a schematic front view of the high-voltage control board 32 shown in FIGS. 1 and 2, FIG. 4 is a schematic side view of the high-voltage control board 32 shown in FIGS. 1 to 3, FIG. 5 is a schematic front view of the battery TIG welding machine 100 according to this embodiment, and FIG. 6 is the dial portion of the battery TIG welding machine 100 according to this embodiment.

[0033] 2 and 5, the battery TIG welder 100 according to this embodiment includes a housing 20 provided with a carrying handle 21. As shown in FIGS. 1 and 5, a TIG torch connection portion 22 (negative electrode) to which a TIG torch (not shown) is connected, and a welding base metal connection portion (positive electrode) 24 to which a welding base metal is connected, are provided at the lower portion of the front side (front face) of the housing 20.

[0034] With a TIG torch connected to the TIG torch connecting portion 22 and a base metal connected to the base metal connecting portion 24, it is possible to carry out TIG welding work on the base metal.

[0035] 1, the housing 20 is provided with an AC power supply connector 18. The AC power supply connector 18 is adapted to be connected to a general 100V commercial AC power supply (outlet) via a cable (not shown).

[0036] 1 and 3, 16 battery cells 1 to 16 that are electrically connected in series are arranged in parallel within the housing 20. Specifically, the 16 battery cells 1 to 16 are arranged in a three-tier structure, with six battery cells 1, 4 to 8 arranged in parallel in the first tier, six battery cells 2 to 3, 9 to 12 arranged in parallel in the second tier, and four battery cells 13 to 16 arranged in parallel in the third tier.

[0037] The center of each battery cell's top and bottom surfaces serves as an electrode, and the electrodes of adjacent battery cells are arranged in opposite directions. As shown in Figure 2, the adjacent electrodes of adjacent battery cells are connected by conductive plates, electrically connecting the 16 battery cells 1 to 16.

[0038] As shown in FIG. 1, a charging circuit 19 is provided inside the housing 20. The charging circuit 19 is connected to an AC power supply connector 18 and controls charging of the plurality of battery cells 1 to 16 by the AC power supply connected to the AC power supply connector 18.

[0039] In the battery TIG welding machine 100 of this embodiment, as shown in Figures 1 to 4, a high-frequency high-voltage generating circuit 30 is provided inside the housing 20, which generates a high-frequency high voltage based on the power charged in multiple battery cells 1 to 16.

[0040] The high-frequency high-voltage generating circuit 30 has a high-voltage control board 32 and an induction coil 34. In this embodiment, the high-voltage control board 32 is arranged in the upper front part of the housing 20 so that the board 32 is oriented vertically, and the induction coil 34 is arranged in the lower front part of the housing 20 so that the coil axis direction is horizontal.

[0041] 3 and 4, the high-voltage control board 32 of this embodiment has a transformer 32t (a flyback transformer in this example), a varistor protection circuit 32b, and a noise filter circuit 32n on the same board. As a result, the transformer 32t, the varistor protection circuit 32b, and the noise filter circuit 32n are electrically connected together via wiring that is approximately the shortest possible length. The varistor protection circuit 32b is a circuit that protects the high-voltage control board 32 from a high-voltage surge that occurs immediately after welding begins.

[0042] The high-voltage control board 32 of this embodiment has dimensions of 75 mm × 125 mm. The height of the high-voltage control board 32 (the maximum height of the mounted electrical elements (transformer 32t, capacitor, etc.)) is also within 40 mm.

[0043] As shown in FIG. 2, a main control circuit 28 is provided within the housing 20 to control the output from the high-frequency high-voltage generating circuit 30 to the TIG torch connection portion 22 (negative electrode) and the welding base metal connection portion 24 (positive electrode).

[0044] An aluminum plate 41 is provided as an electromagnetic shielding member (second electromagnetic shielding member) between the high-voltage control board 32 and the main control circuit 28 in the front-rear direction of the housing 20.

[0045] In this embodiment, an aluminum plate 41 (second electromagnetic shielding member) of approximately the same size (approximately 75 mm × 125 mm) as the high-voltage control board 32 is provided immediately behind the high-voltage control board 32 and approximately parallel to the board 32. Furthermore, on the opposite side of the high-voltage control board 32 from the aluminum plate 41 (i.e., the front side), an aluminum plate 42 serving as an electromagnetic shielding member (first electromagnetic shielding member) is provided approximately parallel to the aluminum plate 41, and further above the high-voltage control board 32, an aluminum plate 43 serving as an electromagnetic shielding member (third electromagnetic shielding member) is provided. The aluminum plate 42 also has approximately the same size (approximately 75 mm × 125 mm) as the high-voltage control board 32.

[0046] In this embodiment, three aluminum plates 41 to 43 are integrally connected to form a U-shaped member when viewed from the side.

[0047] Furthermore, a commercially available noise suppression sheet (not shown) may be provided as a fourth electromagnetic shielding member below high-voltage control board 32. For example, the noise suppression sheet may be provided substantially parallel to aluminum plate 43 so as to bridge the lower edge of aluminum plate 41 and the lower edge of aluminum plate 42.

[0048] The main control circuit 28 controls the output to the TIG torch connection portion 22 (negative electrode) and the welding base material connection portion 24 (positive electrode) according to, for example, the amount of adjustment of the adjustment knob 51 (see Figures 2 and 5) by the user.

[0049] In addition to the adjustment knob 51, an input section is provided on the front side (front face) of the housing 20 of the battery TIG welding machine 100 of this embodiment, as shown in Figures 5 and 6, into which setting information relating to the current value and output waveform after welding starts can be input, and the main control circuit 28 provides the applied voltage based on the setting information input in the input section. The input section on the front side (front face) of the housing 20 has a sheet metal panel 53 (see Figures 2 and 5).

[0050] Specifically, like an AC-driven TIG welding machine (inverter-type TIG welding machine), it is possible to make detailed settings regarding the current value and output waveform after welding starts, for example, the frequency of the pulse waveform can be set.

[0051] Furthermore, TIG torch connection unit 22 of battery TIG welding machine 100 of this embodiment can selectively connect a TIG torch or a manual stick welding, and the input unit on the front side (front side) of housing 20 includes mode switching button 52 (an example of a mode switching unit) that switches between TIG welding and manual stick welding (see FIGS. 5 and 6). High-frequency high-voltage generation circuit 30 is configured to generate a high-frequency high voltage when TIG welding is selected by mode switching button 52, but is not configured to generate a high-frequency high voltage when manual stick welding is selected by mode switching button 52.

[0052] (Communication board 61) Next, the battery TIG welding machine 100 of this embodiment is provided with a communication board 61, as shown in Fig. 2. The communication board 61 of this embodiment is a planar board having dimensions of 40 mm (width) x 45 mm (length) x 1 mm (thickness).

[0053] Fig. 7 is a plan view of the communication board 61. As shown in Fig. 7, the communication board 61 of this embodiment has a communication module 61a, an interface 61b for communication with the main control circuit 28, an antenna 62c for communication with an external device (e.g., a smartphone), a power supply circuit 61d, and an acceleration sensor 61e on the same board.

[0054] The communication module 61a is a module that uses, for example, Bluetooth (registered trademark) pairing as a communication standard, and is thereby able to communicate appropriate information with an external device such as a smartphone via the communication antenna 61c.

[0055] The communication interface 61b is, for example, an RS485 interface, which can be connected to the main control circuit 28 via an RS485 harness.

[0056] The communication antenna 61c is configured, for example, in an elongated shape and is disposed above the communication module 61a so as to extend in the horizontal direction.

[0057] A voltage of, for example, about 30 to 60 V is supplied to the power supply circuit 61d via the communication interface 61b from the main control circuit 28. In this case, the supply voltage is regulated to 3.3 V in the power supply circuit 61d and supplied to the communication module 61a.

[0058] The acceleration sensor 61e is a sensor that senses the movement acceleration of the acceleration sensor 61e itself. This makes it possible to remotely monitor the movement acceleration (i.e., the movement state) of the communication board 61 and, ultimately, the movement acceleration (i.e., the movement state) of the battery TIG welding machine 100. Furthermore, by detecting an unexpected movement state and alerting the user with, for example, an alarm, it is possible to enhance theft prevention effects.

[0059] (Noise suppression plate 62) In this embodiment, a noise suppression plate 62 is provided as a planar substrate separate from the communication board 61. The noise suppression plate 62 in this embodiment has a size of 40 mm (width) × 50 mm (length) × 1 mm (thickness) (its length is 5 mm longer than the communication board 61).

[0060] Fig. 8 is a plan view of the noise suppression plate 62. As shown in Fig. 8, the noise suppression plate 62 of this embodiment is made up of an iron plate (40 mm × 50 mm × 1 mm), a front insulating sheet (an extremely thin sheet (for example, 0.25 mm thick)) of the same size as the iron plate attached to the front surface of the iron plate, and a back insulating sheet (an extremely thin sheet (for example, 0.25 mm thick)) of the same size as the iron plate attached to the back surface of the iron plate.

[0061] 9A and 9B are a plan view (FIG. 9A) and a side view (FIG. 9B; electronic elements mounted on each board 61, 62 are omitted) of a state in which a communication board 61 and a noise suppression plate 62 are assembled via a spacer 63 and a screw 64. As shown in FIG. 9A, the communication board 61 and the noise suppression plate 62 are aligned so that their left and right edges and bottom edges are aligned, and are assembled by interposing a spacer 63 between them to maintain a fixed gap between them.

[0062] In this embodiment, screw holes 61h and 62h are provided in the upper left and lower right parts of the communication board 61 and the noise suppression plate 62, respectively, and a hexagonal spacer 63 having a length of 7 mm and a face length of 4 mm is fixed to the communication board 61 and the noise suppression plate 62, respectively, by a screw 64 and a screw not shown.

[0063] Two mounting holes 62m are provided on the upper edge side of the noise suppression plate 62 in an area that protrudes beyond the upper edge of the communication board 61. Using the mounting holes 62m, the spacer 54 (see FIG. 2), and screws (not shown), the noise suppression plate 62 is attached to the lower part of the sheet metal panel 53 so as to maintain a fixed gap from the lower part of the sheet metal panel 53.

[0064] (Example of layout dimensions) 2, the metal panel 53 is inclined by 15° from the vertical direction. The noise suppression plate 62 and the communication board 61 are also parallel to the metal panel 53 and therefore inclined by 15° from the vertical direction.

[0065] With reference to FIG. 2, examples of the arrangement position in the front-rear direction based on the front end of the housing 20 and the arrangement position in the height direction based on the bottom end of the legs of the housing 20 will be described. The front edge of the circuit board (100 mm long in the left-right direction) of the horizontally disposed main control circuit 28 is located approximately 190 mm rearward from the front end of the housing 20 and approximately 160 mm high. The rear edge of the main control circuit board 28, which is horizontally oriented, It is located approximately 290 mm rearward from the front end of the housing 20 and approximately 160 mm high. The upper edge of the vertically arranged high voltage control board 32 (125 mm in length in the left-right direction) is It is located approximately 130 mm rearward from the front end of the housing 20 and approximately 255 mm high. The lower edge of the vertically disposed high voltage control board 32 is It is located approximately 130 mm rearward from the front end of the housing 20 and approximately 182 mm high. The upper edge of the first electromagnetic shielding member 42 (95 mm in length in the left-right direction) is It is located approximately 84 mm rearward from the front end of the housing 20 and approximately 260 mm high. The lower edge of the first electromagnetic shielding member 42, which is disposed vertically, is It is located approximately 84 mm rearward from the front end of the housing 20 and approximately 182 mm high. The upper edge of the second electromagnetic shielding member 41 (125 mm long in the left-right direction) is It is located approximately 137 mm rearward from the front end of the housing 20 and approximately 261 mm high. The lower edge of the second electromagnetic shielding member 41, which is disposed vertically, is It is located approximately 137 mm rearward from the front end of the housing 20 and approximately 182 mm high. The lower edge of the communication board 61 is It is located approximately 25 mm rearward from the front end of the housing 20 and approximately 130 mm high. The upper edge of the communication board 61 is It is located approximately 37 mm rearward from the front end of the housing 20 and approximately 173 mm high. The lower edge of the noise suppression plate 62 is It is located approximately 32 mm rearward from the front end of the housing 20 and approximately 128 mm high. The upper edge of the noise suppression plate 62 is It is located approximately 46 mm rearward from the front end of the housing 20 and approximately 176 mm high.

[0066] The left-right center lines of the main control circuit board 28, the high-voltage control board 32, and the electromagnetic shielding members 41 to 43 are aligned with the left-right center line of the housing 20. On the other hand, the left-right center lines of the communication board 61 and the noise suppression plate are offset to the right when viewed from the front side of the housing 20 (offset by 50 mm to the right from the left-right center line of the housing 20).

[0067] (Action and effect) According to the battery TIG welding machine 100 of this embodiment as described above, the transformer 32t, the varistor protection circuit 32b, and the noise filter circuit 32n are arranged in a concentrated manner (with approximately the shortest wiring between them) on the same high-voltage control board 32, so that noise generated when high-frequency high voltage is generated can be effectively absorbed.

[0068] Furthermore, according to the battery TIG welding machine 100 of this embodiment, an aluminum plate 41 (an example of a second electromagnetic shielding member) is provided between the high-voltage control board 32 and the main control circuit 28 in the front-to-rear direction of the housing 20, thereby effectively preventing noise generated when high-frequency high voltage is generated from adversely affecting the main control circuit 28.

[0069] The combination of the above two effects (effective noise absorption and effective noise shielding) allows the battery TIG welding machine 100 of this embodiment to withstand the adoption of a high frequency, high voltage start method.

[0070] Furthermore, according to the battery TIG welding machine 100 of this embodiment, an aluminum plate 42 (an example of a first electromagnetic shielding member) is provided on the opposite side of the high-voltage control board 32 from the aluminum plate 41, and an aluminum plate 43 (an example of a third electromagnetic shielding member) is also provided above the high-voltage control board 32, thereby further effectively preventing noise generated when high-frequency high voltage is generated from adversely affecting the main control circuit 28.

[0071] Furthermore, according to the battery TIG welding machine 100 of this embodiment, the three aluminum plates 41 to 43 are integrally connected, which simplifies the manufacture and management of these components and simplifies the assembly of the battery TIG welding machine 100. Furthermore, by selecting the aluminum plates 41 to 43 as the electromagnetic shielding members, effective noise shielding is achieved at low cost.

[0072] Furthermore, if a fourth electromagnetic shielding member is also provided below the high-voltage control board 32, the adverse effects of noise generated when high-frequency high voltage is generated on the main control circuit 28 can be more effectively suppressed.

[0073] Furthermore, the battery TIG welding machine 100 of this embodiment is provided with an input section that can input setting information related to the current value and output waveform after welding starts, and the main control circuit 28 provides the applied voltage based on the setting information input in the input section. As a result, like an AC-driven TIG welding machine, it is possible to make detailed settings regarding the current value and output waveform after welding starts, and it is possible to respond in detail to the characteristics of the welding material, such as the difference between thin and thick plates.

[0074] Furthermore, it is possible to store a plurality of pieces of setting information in advance and selectively call them up, thereby reducing the time required to input the settings before welding work.

[0075] Furthermore, according to the battery TIG welding machine 100 of this embodiment, the TIG torch connection portion 22 can selectively connect to a TIG torch or a manual stick welding, the housing 20 is provided with a mode switching button 52 for switching between TIG welding and manual stick welding, and the high-frequency high-voltage generation circuit 30 generates a high-frequency high voltage when TIG welding is selected by the mode switching button 52, but does not generate a high-frequency high voltage when manual stick welding is selected by the mode switching button 52. This makes it easy to switch between TIG welding and manual stick welding, and also minimizes the effects of noise because unnecessary high-frequency high voltage is not generated.

[0076] When welding is started with the base material and the TIG torch in contact with each other, it is preferable that the high frequency high voltage generating circuit 30 does not generate high frequency high voltage, for example, under the control of the main control circuit 28. Specifically, when the main control circuit 28 detects that the base material and the TIG torch are in contact with each other, it is preferable to adopt the touch start method rather than the high frequency high voltage start method (to switch automatically in this way).

[0077] (Actions and Effects of the Communication Board 61) Furthermore, according to the battery TIG welding machine 100 of this embodiment, as described above, the transformer 32t, the varistor protection circuit 32b, and the noise filter circuit 32n are arranged collectively (with substantially the shortest wiring between them) on the same high-voltage control board 32, so that noise generated when high-frequency high voltage is generated is effectively absorbed, and furthermore, the first electromagnetic shielding member 42 is provided between the high-voltage control board 32 and the communication board 61 in the front-to-rear direction of the housing 20, so that the noise generated when high-frequency high voltage is generated is effectively prevented from adversely affecting the communication module 61a. Therefore, according to the battery TIG welding machine 100 of this embodiment, a communication function that can withstand the adoption of a high-frequency, high-voltage start method can be realized (the risk of malfunction due to noise is significantly reduced).

[0078] Furthermore, according to the battery TIG welding machine 100 of this embodiment, the communication board 61 is a planar board, and a noise suppression board 62 is prepared as a planar board separate from the communication board 61. The noise suppression board 62 is made up of an iron plate, a front insulating sheet attached to the front surface of the iron plate, and a back insulating sheet attached to the back surface of the iron plate, and is disposed parallel to the communication board 61 at a predetermined distance behind the communication board 61. This makes it possible to more effectively suppress the adverse effects of noise from behind the communication board 61.

[0079] Furthermore, according to the battery TIG welding machine 100 of this embodiment, the communication board 61 has a rectangular shape in a plan view, and the noise suppression plate 62 also has a rectangular shape in a plan view, making them easy to manufacture and handle.

[0080] Furthermore, according to the battery TIG welding machine 100 of this embodiment, the width of the communication board 61 and the width of the noise suppression plate 62 are the same, which makes them even easier to manufacture and handle.

[0081] Furthermore, according to the battery TIG welding machine 100 of this embodiment, the communication board 61 also has the power supply circuit 61d on the same board, so there is no need for a harness to connect the two, as compared to when a board for the power supply circuit is provided separately from the communication board 61. This makes it possible to further reduce noise generation (a harness is required from the main control circuit 28 to the communication board 61).

[0082] Furthermore, in the battery TIG welding machine 100 of this embodiment, the second electromagnetic shielding member 41 is provided behind the high-voltage control board 32 when viewed in the front-to-rear direction of the housing 20. This further effectively prevents noise generated by high-frequency high voltage from adversely affecting the communication board 61.

[0083] Furthermore, in the battery TIG welding machine 100 of this embodiment, the third electromagnetic shielding member 43 is provided above the high-voltage control board 32 when viewed in the vertical direction of the housing 20. This further effectively prevents noise generated by high-frequency high voltage from adversely affecting the communication board 61.

[0084] (Example of communication function usage) As described above, the battery TIG welding machine 100 of this embodiment can achieve a communication function that can withstand the adoption of a high-frequency, high-voltage start method. Specifically, while the input unit including the adjustment knob 51 and the like can input setting information related to the current value and output waveform after welding starts, it is also possible to alternatively or additionally input setting information related to the current value and output waveform after welding starts into an external device such as a smartphone by using Bluetooth (registered trademark) pairing or the like.

[0085] In addition, in an external device such as a smartphone, it is also possible to monitor the battery balance of battery cells 1 to 16, battery temperature, whether the battery is over-discharged, total battery voltage, current consumption, charging voltage, voltage of each cell, etc.

[0086] Furthermore, if the battery TIG welding machine 100 is set to a state in which it cannot be operated without a paired external device, then even if the battery TIG welding machine 100 is stolen, the battery TIG welding machine 100 cannot be operated, thereby substantially increasing the anti-theft effect of the battery TIG welding machine 100.

[0087] Furthermore, the communication board 61 of this embodiment also has an acceleration sensor 61e on the same board, which can detect the movement acceleration (i.e., movement state) of the communication board 61 and, in turn, the movement acceleration (i.e., movement state) of the battery TIG welding machine 100. This allows the movement state of the battery TIG welding machine 100 to be remotely managed. Furthermore, by detecting unplanned movement states, the theft prevention effect can be enhanced. [Explanation of symbols]

[0088] 1~16 battery cells 18 AC power connection 19 Charging circuit 20 Case 21 Carrying handle 22 TIG torch connection part 24 Welded base material joint 28 Main control circuit 30 High frequency high voltage generation circuit 32 High voltage control board 32b Varistor protection circuit 32n noise filter circuit 32t transformer 34 Induction Coil 41 Aluminum plate (second electromagnetic shielding member) 42 Aluminum plate (first electromagnetic shielding member) 43 Aluminum plate (third electromagnetic shielding member) 51 Adjustment knob 52 Mode switch button 53 Sheet Metal Panel 54 Spacer 61 Communication board 61a Communication Module 61b Communication Interface 61c Communication Antenna 61d Power supply circuit 61e Acceleration sensor 61h screw hole 62 Noise suppression plate 62h screw hole 62m mounting hole 63 Spacer 64 screws 100 Battery TIG Welder

Claims

1. A portable housing and a TIG torch connection portion provided on the housing; an AC power supply connection portion provided on the housing; a battery cell housed within the housing; a charging circuit housed in the housing and connected to the AC power supply connector, for controlling charging of the battery cells by an AC power supply connected to the AC power supply connector; a high-frequency, high-voltage generating circuit housed in the housing and configured to generate a high-frequency, high-voltage based on the power charged in the battery cell; a main control circuit housed in the housing and controlling the output of high frequency high voltage from the high frequency high voltage generating circuit to the TIG torch connecting portion; Equipped with the high-frequency high-voltage generating circuit includes a high-voltage control board and an induction coil; The high-voltage control board has a transformer, a varistor protection circuit, and a noise filter circuit on the same board, an electromagnetic shielding member is provided on the front side of the high-voltage control board when viewed in the front-rear direction of the housing, a communication board is provided further forward of the electromagnetic shielding member when viewed in the front-rear direction of the housing, The communication board has a communication module, an interface for communication with the main control circuit, and an antenna for communication with an external device on the same board. A battery TIG welding machine characterized by:

2. the communication board is a planar board, a noise suppression board, which is a separate planar board, is provided in parallel with the communication board at a predetermined distance behind the communication board; The noise suppression plate comprises an iron plate, a front insulating sheet attached to the front surface of the iron plate, and a back insulating sheet attached to the back surface of the iron plate.

2. The battery TIG welding machine according to claim 1.

3. the communication board has a rectangular shape in a plan view, The noise suppression plate also has a rectangular shape in a plan view.

3. The battery TIG welding machine according to claim 2.

4. The width of the communication board and the width of the noise suppression board are the same.

4. The battery TIG welding machine according to claim 3.

5. The communication board also has a power supply circuit on the same board.

5. A battery TIG welding machine according to claim 1.

6. The communication board also has an acceleration sensor on the same board.

6. A battery TIG welder according to claim 5.

7. A second electromagnetic shielding member is provided on the rear side of the high-voltage control board when viewed in the front-rear direction of the housing.

7. The battery TIG welding machine according to claim 6.

8. A third electromagnetic shielding member is provided above the high-voltage control board when viewed in the vertical direction of the housing.

8. The battery TIG welding machine according to claim 7.

9. The electromagnetic shielding member, the second electromagnetic shielding member, and the third electromagnetic shielding member are integrally configured.

9. The battery TIG welder according to claim 8.

10. The electromagnetic shielding member, the second electromagnetic shielding member, and the third electromagnetic shielding member are made of aluminum.

10. The battery TIG welder according to claim 9.

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