Power supply device for thermal processing

Abstract

To provide a power supply device for thermal processing that allows even an unskilled worker to easily perform operations for solving problems.SOLUTION: A welding power supply device A1 includes: a power conversion unit 1 that converts input power into power for thermal processing; a control unit 2 that controls the power conversion unit 1; and a display unit 4 having a display device and displaying information on a screen of the display device. The control unit 2 includes a display control section 24 that controls the display unit 4. The display control section 24 causes the display unit 4 to display a first screen 9a on which a plurality of problems are listed in a selectable manner, a second screen 9b on which a plurality of detailed problems that a user wants to solve in the problems selected on the first screen 9a are listed in a selectable manner, and a third screen 9c on which a method for solving the detailed problems selected on the second screen 9b is displayed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power supply device for thermal processing. [Background technology]

[0002] Conventionally, thermal processing power supply devices are known that generate an arc between the tip of a torch electrode and a workpiece to perform thermal processing such as welding or cutting of the workpiece. In thermal processing power supply devices, operators are required to set various parameters. For example, in a welding power supply for welding, parameters such as welding voltage and welding current are set, and the current parameter settings are displayed on a display device. The operator can change the settings displayed on the display device by operating an operating device. Patent Document 1 discloses a welding machine in which a processor 11 generates an editable work list editing screen SC1, outputs it to a display unit 13, and accepts editing operations based on operator input. The work list editing screen SC1 displays numerous parameters, such as welding command values, base material material, plate thickness, wire information, joints, welding method, and waveform. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7349610 Summary of the Invention [Problem to be solved by the invention]

[0004] An unskilled worker cannot easily determine which of the many adjustable parameters should be adjusted to resolve a problem with the welding finish. For example, poor weldability can be caused by a variety of factors, and in some cases, adjusting a parameter displayed on the display means is sufficient, while in other cases, parameters not displayed on the display means must be read and adjusted. Even if a welding power supply is equipped with a special function for resolving the problem, a worker who is not proficient in operating the welding power supply cannot effectively utilize the function. Therefore, when a problem occurs, an unskilled worker must consult a manual or an expert to find a way to address the problem before operating the welding power supply. This applies not only to problems with the welding finish, but also to other problems related to the operation of the welding power supply.

[0005] The present invention was conceived in light of the above-mentioned circumstances, and its object is to provide a power supply device for thermal processing that allows an unskilled worker to easily perform operations to solve problems. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides the following technical means.

[0007] The thermal processing power supply device of the present invention comprises a power conversion unit that converts input power into power for thermal processing, a control unit that controls the power conversion unit, and a display unit that has a display device and displays information on the screen of the display device, wherein the control unit comprises a display control unit that controls the display unit, and the display control unit causes the display unit to display a first screen on which a plurality of problems are listed in a selectable manner, a second screen on which a plurality of detailed problems that the user wishes to solve of the problem selected on the first screen are listed in a selectable manner, and a third screen on which methods for solving the detailed problem selected on the second screen are displayed.

[0008] In a preferred embodiment of the present invention, the third screen displays an operation display that allows an operation to be performed to execute the displayed solution.

[0009] In a preferred embodiment of the present invention, when controlling heat input during welding is selected from among the plurality of detailed problems on the second screen, the display control unit causes the third screen to display a description suggesting the use of an interval function which alternates between an ON state in which current flows to the arc and an OFF state in which current does not flow, and causes the display control unit to display a first operation display for an operation to select whether or not to use the interval function, a second operation display for adjusting the ON time which is the duration of the ON state, and a third operation display for adjusting the OFF time which is the duration of the OFF state.

[0010] In a preferred embodiment of the present invention, when unstable welding is selected on the second screen from among the plurality of detailed problems when the power cable is extended, the display control unit causes the third screen to display a description suggesting the use of an extension mode, which is a mode that can be used to perform stable welding when the power cable is extended, and causes an operation display for selecting whether or not to use the extension mode.

[0011] In a preferred embodiment of the present invention, when a request to easily adjust the welding current is selected from among the multiple detailed problems on the second screen, the display control unit causes the third screen to display a description suggesting the use of a current adjustment function by operating a torch switch, and displays a first operation display for selecting whether or not to use the function, a second operation display for adjusting the amount of increase in the welding current when single-clicking, and a third operation display for adjusting the amount of decrease in the welding current when double-clicking.

[0012] In a preferred embodiment of the present invention, the display control unit displays, on the second screen, attribute information relating to the effects obtained by changing parameters that determine the behavior of the thermal processing power supply device, and when the attribute information is selected, causes the third screen to display a description suggesting increasing or decreasing the parameter and an operation display for increasing or decreasing the parameter.

[0013] In a preferred embodiment of the present invention, the display control unit displays, instead of the second screen, a fourth screen on which a plurality of detailed problems to be solved of the problem selected on the first screen are listed in a selectable manner, and a fifth screen on which a plurality of more detailed problems to be solved of the detailed problem selected on the fourth screen are listed in a selectable manner, and a method for solving the more detailed problem selected on the fifth screen is displayed on the third screen. [Effects of the Invention]

[0014] According to the present invention, the display device of the display unit displays a first screen on which a plurality of problems are listed in a selectable manner. The worker selects a problem to be solved from the plurality of problems. In response, the display device displays a second screen on which detailed problems to be solved of the problem selected on the first screen are listed in a selectable manner. The worker selects a detailed problem to be solved from the plurality of detailed problems. In response, the display device displays a third screen on which a method for solving the detailed problem selected on the second screen is displayed. The worker can view the displayed third screen, understand the solution method, and perform the corresponding operation. As a result, the thermal processing power supply device according to the present invention allows even an unskilled worker to easily perform operations to solve problems.

[0015] Other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0016] [Figure 1]1A and 1B are diagrams for explaining a welding power supply according to a first embodiment, in which FIG. 1A is a block diagram showing the overall configuration of a welding system equipped with the welding power supply, and FIG. 1B shows an example of the data structure of some of the information stored in a memory unit of the welding power supply. [Figure 2] 1 shows an example of a screen 9 displayed on a display device. [Figure 3] 1 shows an example of a screen 9 displayed on a display device. [Figure 4] FIG. 10 is a block diagram showing the overall configuration of a welding system including a welding power supply according to a second embodiment. [Figure 5] FIG. 10 is a block diagram showing the overall configuration of a welding system including a welding power supply according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, taking as an example a case where a power supply device for thermal processing according to the present invention is a welding power supply device.

[0018] [First embodiment] FIG. 1 is a diagram illustrating a welding power supply A1 according to a first embodiment. FIG. 1(a) is a block diagram showing the overall configuration of a welding system including welding power supply A1. FIG. 1(b) shows an example of the data structure of some of the information stored in the memory unit of welding power supply A1. The welding system includes welding power supply A1, power cables C1 and C2, a wire feeder D, and a welding torch T.

[0019] One output terminal of the welding power supply A1 is conductively connected to the welding torch T via a power cable C1. The wire feeder D feeds the welding wire to the welding torch T, causing the tip of the welding wire to protrude from the tip of the welding torch T. The power cable C1 and the welding wire are electrically connected via a contact tip located at the tip of the welding torch T. The other output terminal of the welding power supply A1 is conductively connected to the workpiece W via a power cable C2. The welding power supply A1 generates an arc between the tip of the welding wire protruding from the tip of the welding torch T and the workpiece W, and supplies power to the arc. The welding system welds the workpiece W using the heat of the arc. Note that the configuration of the welding system is not limited. For example, the welding system may not include the wire feeder D and may use a non-consumable electrode instead of the welding wire.

[0020] Welding power supply A1 supplies DC power for arc welding to welding torch T. Welding power supply A1 includes a power conversion unit 1, a control unit 2, an operation unit 3, a display unit 4, a memory unit 6, and a current sensor 7.

[0021] The power conversion unit 1 converts AC power input from, for example, a commercial power source into DC power suitable for welding and outputs the DC power. For example, the power conversion unit 1 includes a primary rectifier circuit, an inverter circuit, a transformer, and a secondary rectifier circuit (not shown). The primary rectifier circuit converts AC power into DC power and outputs the DC power. The inverter circuit converts the DC power output from the primary rectifier circuit into high-frequency AC power. The high-frequency AC power is input to the secondary rectifier circuit via a transformer. The secondary rectifier circuit converts the high-frequency AC power into DC power and outputs the DC power. Note that the configuration of the power conversion unit 1 is not limited to the one described above. For example, the power conversion unit 1 may further include an inverter between the secondary rectifier circuit and the output terminal to output AC power.

[0022] Current sensor 7 detects the output current of welding power supply A1. In this embodiment, current sensor 7 is disposed on a connection line between one output terminal of power conversion unit 1 and the output terminal to which power cable C2 is connected. The location of current sensor 7 is not limited. Current sensor 7 outputs a current detection signal corresponding to the output current to control unit 2.

[0023] The display unit 4 includes a display device such as a liquid crystal display, and displays various information on the screen of the display device in response to commands from the control unit 2 (display control unit 24, which will be described later). The display unit 4 displays, for example, first to third screens, which will be described later.

[0024] The operation unit 3 is equipped with operation means such as operation buttons and operation dials, and outputs operation of the operation means by the operator as operation signals to the control unit 2. There are no limitations on the type and number of operation means equipped in the operation unit 3. For example, the operation unit 3 may be equipped with a touch screen arranged on the screen of a liquid crystal display as an operation means.

[0025] The operating means of the operating unit 3 and the display device of the display unit 4 are arranged, for example, on an operation panel of a housing (not shown). The worker operates the operating means while looking at the screen of the display device to select options displayed on the screen and to perform various settings such as parameter adjustment.

[0026] The storage unit 6 has a memory and stores various information. The various information includes the current setting values ​​of each welding parameter, information for displaying each screen, and control software. The storage unit 6 stores, rewrites, and reads information in response to commands from the control unit 2.

[0027] Control unit 2 controls welding power supply A1 and is realized by, for example, a microcomputer. Control unit 2 controls the inverter circuit of power conversion unit 1 so that the output current of welding power supply A1 becomes the set current. Control unit 2 also performs predetermined processing in response to operation signals input from operation unit 3. Control unit 2 also displays various information on display unit 4. Control unit 2 also stores, rewrites, and reads information in memory unit 6. Control unit 2 has, as its functional configuration, a set value setting unit 21, a current control unit 22, and a display control unit 24.

[0028] The set value setting unit 21 is a functional component for setting set values. The set value setting unit 21 reads and sets the current set value of each parameter stored in the memory unit 6. For example, the set value setting unit 21 outputs the set value of the welding current stored in the memory unit 6 to the current control unit 22 as a current command value.

[0029] Current control unit 22 is a functional component for controlling the output current of welding power supply A1. Current control unit 22 performs feedback control of the output current of welding power supply A1 based on a current detection signal input from current sensor 7. Specifically, current control unit 22 generates a drive signal based on the difference between a current value corresponding to the current detection signal and a current command value input from set value setting unit 21, and outputs the drive signal to power conversion unit 1. Power conversion unit 1 controls the output current to the current command value by turning on and off each switching element of the inverter circuit based on the input drive signal.

[0030] In this embodiment, the functional configuration in which the control unit 2 performs current control is described, but the present invention is not limited to this. The control unit 2 may also have functional configurations for other control methods.

[0031] The display control unit 24 is a functional configuration for controlling the display of various information on the display unit 4. The control unit 2 determines the display content depending on the situation and outputs a display command to the display control unit 24. In response to the display command from the control unit 2, the display control unit 24 reads information from the storage unit 6 and displays it on the display unit 4.

[0032] In this embodiment, the storage unit 6 stores, as information for displaying each screen, information for displaying a menu screen and information for displaying each screen corresponding to an item selected on the menu screen. One of the items selectable on the menu screen is "Welding Advisor." The Welding Advisor is a function for guiding the user through operations to solve a problem, and is selected on the menu screen.

[0033] FIG. 1(b) shows an example of the data structure of information stored in the storage unit 6 for displaying each screen related to the welding advisor.

[0034] The storage unit 6 stores welding advisor display information for displaying the main screen of the welding advisor (hereinafter referred to as the "first screen"). The welding advisor display information includes information on selectable problems 1 to n. Note that n is a natural number equal to or greater than 2 and is not limited to a specific number. The first screen displays these problems 1 to n in a selectable list.

[0035] The storage unit 6 stores problem k (k=1 to n) detailed display information for displaying a plurality of detailed screens (hereinafter referred to as "second screens") corresponding to the problems 1 to n of the first screen, respectively. The problem 1 detailed display information includes a plurality of selectable detailed problems 1-1 to 1-m related to problem 1. Note that m is a natural number equal to or greater than 2 and is not limited thereto. The second screen corresponding to problem 1 displays these detailed problems 1-1 to 1-m in a selectable list. The same is true for problem 2 detailed display information to problem n detailed display information, but the number of included detailed problems is not the same.

[0036] The storage unit 6 stores a plurality of pieces of problem solution method display information for displaying a plurality of answer screens (hereinafter referred to as "third screens") respectively corresponding to a plurality of detailed problems on each second screen. The plurality of pieces of problem solution method display information include, for example, problem 1-1 solution method display information to problem 1-m solution method display information respectively corresponding to detailed problems 1-1 to 1-m. The problem 1-1 solution method display information includes information for solving the detailed problem 1-1. The third screen corresponding to the detailed problem 1-1 displays information for solving this detailed problem 1-1. The same applies to the other problem solution method display information.

[0037] The detailed information for solving the problem included in each problem solution display information may include not only a written description of the solution but also display information for operations to execute the solution. In this case, the third screen displays the text describing the solution together with a display for operations to execute the solution (hereinafter referred to as "operation display"). The operation display includes a display for operations to select whether to use or not use a function, a display for operations to adjust parameters, a display for operations to order consumable parts, and a display for operations to request repairs.

[0038] When a command to display a menu screen is input from control unit 2, display control unit 24 displays the menu screen on display unit 4. When the worker operates the control unit 2 to select "Welding Advisor" on the menu screen, control unit 2 outputs a command to display a first screen (main screen of the welding advisor) to display control unit 24. When this display command is input, display control unit 24 displays the first screen on display unit 4. The first screen displays problems 1 to n in a selectable list. When the worker operates the operating means of operation unit 3 to select a problem to be solved from problems 1 to n, control unit 2 outputs a command to display a second screen (detail screen corresponding to the problem selected on the first screen) to display control unit 24. When this display command is input, display control unit 24 displays the second screen on display unit 4. The second screen displays a selectable list of multiple detailed problems. When the worker operates the operating means of the operating unit 3 to select a detailed problem that the worker wants to solve, the control unit 2 outputs a display command for the third screen (an answer screen corresponding to the detailed problem selected on the second screen) to the display control unit 24. When the display command is input, the display control unit 24 displays the third screen on the display unit 4. A method for solving the selected detailed problem is displayed on the third screen.

[0039] Fig. 2 shows an example of a screen 9 displayed on the display device of the display unit 4. Fig. 2(a) is a diagram showing an example of a first screen (main screen of the welding advisor) 9a. Fig. 2(b) is a diagram showing an example of a second screen (detail screen corresponding to the problem selected on the first screen) 9b. Fig. 2(c) is a diagram showing an example of a third screen (answer screen corresponding to the detailed problem selected on the second screen) 9c.

[0040] The first screen 9a shown in FIG. 2(a) is displayed when "Welding Advisor" is selected on the menu screen. As shown in FIG. 2(a), multiple problem display sections 91 are arranged on the first screen 9a. Each problem display section 91 describes a problem to be solved. The number and arrangement of the problem display sections 91 on the first screen 9a are not limited. The problems described in each problem display section 91 are not limited to those shown in FIG. 2(a). A cursor 99 moves on the first screen 9a in response to operation of the operating means of the operation unit 3. The worker can select one of the problem display sections 91 by aligning the cursor 99 with the problem display section 91 and pressing the operation button. In FIG. 2(a), the cursor 99 is positioned over the problem display section 91 that describes "I want to improve my welding method." The worker can return to the menu screen by selecting the back button 98.

[0041] The second screen 9b shown in FIG. 2(b) is displayed when a problem display section 91 containing the phrase "I want to improve the welding method" is selected on the first screen 9a. As shown in FIG. 2(b), the second screen 9b has multiple detailed problem display sections 92. Each detailed problem display section 92 describes a specific problem to be solved. The number and arrangement of the detailed problem display sections 92 on the second screen 9b are not limited. The detailed problems described in each detailed problem display section 92 are not limited to those shown in FIG. 2(b). The cursor 99 moves on the second screen 9b in response to the operation of the operating means of the operation unit 3. The operator can select a specific detailed problem display section 92 by aligning the cursor 99 with one of the detailed problem display sections 92 and pressing the operation button. In FIG. 2(b), the cursor 99 is positioned over the detailed problem display section 92 containing the phrase "I want to control the heat input during welding." The operator can return to the first screen 9a by selecting the back button 98.

[0042] The third screen 9c shown in FIG. 2(c) is displayed when the detailed problem display section 92, which states "I want to control the heat input during welding," is selected on the second screen 9b. As shown in FIG. 2(c), the third screen 9c displays an answer display 93 and operation displays 94-96 that show how to solve the detailed problem in the selected detailed problem display section 92. The answer display 93 explains the solution using text and images. In the example of FIG. 2(c), it displays a description suggesting the use of the interval function, as well as descriptions and images explaining the interval function. The interval function alternates between an ON state, in which welding current flows to the arc, and an OFF state, in which no current flows. The interval function adjusts the heat input during welding by adjusting the ON time, which is the duration of the ON state, and the OFF time, which is the duration of the OFF state.

[0043] Operation displays 94 to 96 are displays for operations to execute the solution displayed in answer display 93. Operation display 94 is a display for operations to select whether to use or not use the interval function, and includes an "On" display indicating use and an "Off" display indicating not use. The worker can switch to a state in which the interval function is used by moving cursor 99 to the "On" display and pressing the operation button, and can switch to a state in which the interval function is not used by moving cursor 99 to the "Off" display and pressing the operation button.

[0044] Operation display 95 is a display for adjusting the ON time, and includes a "+" display to increase the ON time, a "-" display to decrease the ON time, and an "OK" display to set the ON time. Operation display 96 is a display for adjusting the OFF time, and includes a "+" display to increase the OFF time, a "-" display to decrease the OFF time, and an "OK" display to set the OFF time. The operator can operate each display by moving cursor 99 to each display and pressing the operation button.

[0045] The number and arrangement of the answer display 93 and operation displays 94 to 96 on the third screen 9c are not limited. For example, the operation displays 95 and 96 may be displayed only when "On" is selected on the operation display 94. The worker can return to the second screen 9b by selecting the back button 98.

[0046] Fig. 3 shows another example of the screen 9 displayed on the display device of the display unit 4. Fig. 3(a) is a diagram showing an example of the first screen 9a (main screen of the welding advisor), which is the same as Fig. 2(a). Fig. 3(b) is a diagram showing an example of the second screen 9b. Fig. 3(c) is a diagram showing an example of the third screen 9c.

[0047] In the first screen 9a shown in FIG. 3(a), a cursor 99 is positioned on a problem display section 91 that reads "poor weldability."

[0048] The second screen 9b shown in FIG. 3(b) is displayed when a problem display section 91 that reads "poor weldability" is selected on the first screen 9a. As shown in FIG. 3(b), the second screen 9b has a plurality of detailed problem display sections 92 arranged thereon. Each detailed problem display section 92 describes a specific problem to be solved. The number and arrangement of the detailed problem display sections 92 on the second screen 9b are not limited. The detailed problems described in each detailed problem display section 92 are not limited to those shown in FIG. 3(b). In FIG. 3(b), the cursor 99 is positioned over the detailed problem display section 92 that reads "unstable welding when extending the power cable."

[0049] The third screen 9c shown in Fig. 3(c) is displayed when the detailed problem display section 92 that states "Welding is unstable when the power cable is extended" is selected on the second screen 9b. As shown in Fig. 3(c), the third screen 9c has an answer display 93 and an operation display 94. In the example of Fig. 3(c), the answer display 93 displays a statement suggesting the use of the extension mode and a statement explaining the extension mode. The extension mode is a mode that can be used when the power cable is extended, which tends to make the arc unstable, to minimize the effects of disturbances and enable stable welding.

[0050] The operation display 94 is a display for selecting whether or not to use the extension mode, and includes an "On" display indicating use and an "Off" display indicating non-use. The operator can switch to a state in which the extension mode is used by moving the cursor 99 to the "On" display and pressing the operation button, and can switch to a state in which the extension mode is not used by moving the cursor 99 to the "Off" display and pressing the operation button.

[0051] There is no limitation on the number and arrangement of answer displays 93 and operation displays 94 on the third screen 9c. The worker can return to the second screen 9b by selecting the back button 98.

[0052] Furthermore, when a problem display section 91 containing the phrase "I want to change the settings of peripheral devices" is selected on the first screen 9a (the main screen of the welding advisor) shown in FIGS. 2(a) and 3(a), a second screen 9b is displayed. This screen displays multiple detailed problem displays 92 related to changing the settings of peripheral devices. When a detailed problem display section 92 containing the phrase "I want to easily adjust the welding current" is selected on the second screen 9b, a third screen 9c about the current adjustment function via torch switch operation is displayed. The third screen 9c displays a message suggesting the use of the current adjustment function via torch switch operation and an answer display showing an explanation of the function. The current adjustment function via torch switch operation increases or decreases the welding current by operating the torch switch. A single click of the torch switch increases the welding current, and a double click decreases the welding current. The third screen 9c also includes an operation display for selecting whether or not to use the function, an operation display for adjusting the increase in the welding current when a single click is performed, and an operation display for adjusting the decrease in the welding current when a double click is performed.

[0053] Furthermore, when a problem display section 91 indicating "A malfunction has occurred" is selected on the first screen 9a (the main screen of the welding advisor) shown in FIGS. 2(a) and 3(a), a second screen 9b is displayed. This second screen 9b displays multiple detailed problem display sections 92 detailing the various malfunctions. When one of the multiple detailed problem display sections 92 on the second screen 9b is selected, a third screen 9c is displayed, detailing how to resolve the malfunction. The third screen 9c displays an answer display that explains, in text or with a diagram, how to resolve the malfunction. Depending on the type of malfunction, the third screen 9c may also display an operation display for ordering consumable parts that need replacement or an operation display for requesting repairs. In the operation display for ordering consumable parts, the worker can select the order quantity and press an operation button to order the consumable parts. In the operation display for requesting repairs, the worker can select the desired date and time for repair and press an operation button to send a repair request email.

[0054] Also, for each parameter that determines the behavior of welding power supply A1, a detailed problem display section 92 may be displayed on second screen 9b, which describes attribute information regarding the effect obtained by changing the parameter. In this case, when detailed problem display section 92 is selected, an answer display showing a description proposing to increase or decrease the parameter and an operation display for the operation to increase or decrease the parameter may be arranged on third screen 9c.

[0055] Next, the effects of the welding power supply A1 will be described.

[0056] According to this embodiment, when the operator selects "Welding Advisor" on the menu screen, display control unit 24 causes display unit 4 to display first screen 9a (welding advisor main screen) on which a plurality of problems are listed in a selectable manner. The operator selects a problem to be solved from the plurality of problems. In response, display control unit 24 causes display unit 4 to display second screen 9b on which selectable detailed problems to be solved of the problem selected on first screen 9a are listed. The operator selects a detailed problem to be solved from the plurality of detailed problems. In response, display control unit 24 causes display unit 4 to display third screen 9c on which a method for solving the detailed problem selected on second screen 9b is displayed. The operator can view third screen 9c, understand the solution method, and perform the corresponding operation. This allows welding power supply A1 to easily perform problem-solving operations even for operators who are not skilled in the work.

[0057] Furthermore, in this embodiment, the third screen 9c displays an operation display that allows an operator to perform an operation to execute the displayed solution. This allows the operator to execute the displayed solution by performing an operation on the operation display. Therefore, the welding power supply A1 allows an operator who is not skilled in the work to more easily perform operations to solve a problem.

[0058] Furthermore, according to this embodiment, as shown in FIG. 2, when the detailed problem display section 92 on the second screen 9b that reads "I want to control the heat input during welding" is selected, a description is displayed on the third screen 9c suggesting the use of the interval function, which is a function that alternates between an ON state in which current flows to the arc and an OFF state in which current does not flow. This allows the worker to recognize that using the interval function is all that is needed to control the heat input during welding. Also, the third screen 9c displays an operation display for selecting whether or not to use the interval function, an operation display for adjusting the ON time, and an operation display for adjusting the OFF time. This allows the worker to immediately use the interval function.

[0059] Furthermore, according to this embodiment, as shown in Fig. 3, when the detailed problem display section 92 that states "Welding is unstable when the power cable is extended" is selected on the second screen 9b, a message suggesting the use of extension mode is displayed on the third screen 9c. This allows the worker to recognize that if welding is unstable when the power cable is extended, the worker should use extension mode. Also, the third screen 9c displays an operation display for selecting whether or not to use extension mode. This allows the worker to immediately use extension mode.

[0060] Furthermore, according to this embodiment, when the detailed problem display section 92 containing the phrase "I want to easily adjust the welding current" is selected on the second screen 9b, a message suggesting the use of the current adjustment function via torch switch operation is displayed on the third screen 9c. This allows the worker to recognize that if they want to easily adjust the welding current, they can use the current adjustment function via torch switch operation. The third screen 9c also displays an operation indicator for selecting whether or not to use the function, an operation indicator for adjusting the amount of increase in the welding current with a single click, and an operation indicator for adjusting the amount of decrease in the welding current with a double click. This allows the worker to immediately use the current adjustment function via torch switch operation.

[0061] Furthermore, according to this embodiment, a detailed problem display section 92 containing attribute information relating to the effect obtained by changing a parameter is displayed on the second screen 9b, and when the detailed problem display section 92 is selected, a description suggesting increasing or decreasing the parameter is displayed on the third screen 9c. This allows the worker to recognize that if the worker wants to obtain the effect, all he or she needs to do is increase or decrease the parameter. Furthermore, an operation display for increasing or decreasing the parameter is displayed on the third screen 9c. This allows the worker to immediately increase or decrease the parameter.

[0062] In the present embodiment, the problem is solved in three stages: the first screen 9a, the second screen 9b, and the third screen 9c. However, this is not limiting. The display control unit 24 may hierarchically display the fourth screen and the fifth screen instead of the second screen 9b. That is, the display control unit 24 may display the fourth screen, in which a plurality of selectable detailed problems are listed, as a details screen corresponding to the problem selected on the first screen 9a; the fifth screen, in which a plurality of selectable more detailed problems are listed, as a details screen corresponding to the detailed problem selected on the fourth screen; and the third screen 9c as an answer screen corresponding to the more detailed problem selected on the fifth screen. That is, the problem may be solved in four stages: the first screen 9a, the fourth screen, the fifth screen, and the third screen 9c. In this case, the problem is set hierarchically in more stages, allowing the worker to more easily find the problem they want to solve.

[0063] Second Embodiment FIG. 4 is a diagram for explaining a welding power supply A2 according to a second embodiment, and is a block diagram showing the overall configuration of a welding system including the welding power supply A2. In FIG. 4, elements that are the same as or similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and redundant explanations will be omitted. The welding power supply A2 according to this embodiment differs from the welding power supply A1 according to the first embodiment in that it can be displayed and operated by a remote control device. The configuration and operation of other parts of this embodiment are the same as those of the first embodiment.

[0064] The welding power supply A2 according to this embodiment further includes a communication unit 5 and a remote control device 8. The communication unit 5 communicates with the remote control device 8 via a communication line. The communication unit 5 transmits signals input from the control unit 2 to the remote control device 8. The communication unit 5 also outputs signals received from the remote control device 8 to the control unit 2. The control unit 2 transmits a display command to the remote control device 8 via the communication unit 5 instead of (or in addition to) the display unit 4. The control unit 2 also receives an operation signal from the remote control device 8 via the communication unit 5 instead of (or in addition to) receiving an operation signal from the operation unit 3.

[0065] The remote control device 8 is a device for operating the welding power supply A2 and is realized by installing a dedicated program on, for example, a general-purpose tablet device. The dedicated program may be downloaded from a server via a communication line or provided in a storage medium such as a USB memory. The remote control device 8 may also be a dedicated device with the dedicated program pre-installed. The remote control device 8 includes a control unit 82, an operation unit 83, a display unit 84, a storage unit 86, and a communication unit 85. The communication unit 85 communicates with the communication unit 5 via a communication line. The control unit 82 outputs display commands received via the communication unit 85 to the display unit 84. In response to the display commands, the display unit 84 displays the first screen 9a, the second screen 9b, and the third screen 9c on a display device such as an LCD display. The operation unit 83 includes an operation means, such as a touch screen disposed on the LCD display screen, and outputs operation signals input by the operator to the control unit 2. The control unit 82 transmits the operation signals via the communication unit 85. That is, the display unit 84 of the remote control device 8 functions in the same way as the display unit 4, and the operation unit 83 of the remote control device 8 functions in the same way as the operation unit 3.

[0066] Note that communication between communication unit 85 of remote control device 8 and communication unit 5 of welding power supply A1 is not limited to wireless communication and may be wired communication. Furthermore, remote control device 8 may be a so-called remote control connected to welding power supply A1 by a cable.

[0067] In this embodiment, display control unit 24 also displays first screen 9a, second screen 9b, and third screen 9c on display unit 4. By viewing third screen 9c, the worker can understand how to solve the problem and perform the corresponding operation. This allows welding power supply A2 to be easily operated by an unskilled worker to solve the problem. Furthermore, welding power supply A2 has a common configuration with welding power supply A1, and thus achieves the same effects as welding power supply A1. As can be seen from this embodiment, the placement of the display device and operating means is not limited to the housing of the welding power supply main body.

[0068] Third Embodiment FIG. 5 is a diagram for explaining a welding power supply A3 according to a third embodiment, and is a block diagram showing the overall configuration of a welding system including the welding power supply A3. In FIG. 5, elements that are the same as or similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and redundant explanations will be omitted. The welding power supply A3 according to this embodiment differs from the welding power supply A1 according to the first embodiment in that information for displaying each screen related to the welding advisor is stored in a server. The configuration and operation of other parts of this embodiment are the same as those of the first embodiment.

[0069] The welding power supply A3 according to this embodiment further includes a communication unit 5. The communication unit 5 communicates with a server S via a communication line. In this embodiment, information for displaying each screen related to the welding advisor (welding advisor display information, multiple problem detail display information, and multiple problem solution display information) is stored in the server S rather than in the memory unit 6. The control unit 2 reads the information stored in the server S via the communication unit 5. Note that communication between the communication unit 5 of the welding power supply A1 and the server S is not limited to wireless communication but may be wired communication. The server S can communicate with multiple welding power supplies A3 and provide information to each welding power supply A3. Problems and their solutions included in the welding advisor may be added as functions of the welding power supply A3 are added, or in response to questions or requests from users. Adding information to the server S eliminates the need to add it individually to the memory unit 6 of each welding power supply A3.

[0070] In both this embodiment and the present embodiment, the display control unit 24 displays the first screen 9a, the second screen 9b, and the third screen 9c on the display unit 4. The worker can view the displayed third screen 9c, understand the solution, and perform the corresponding operation. This allows the welding power supply A3 to easily perform problem-solving operations even for unskilled workers. Furthermore, the welding power supply A3 achieves the same effects as the welding power supply A1 by sharing the same configuration with the welding power supply A1. Furthermore, according to this embodiment, the server S stores information for displaying each screen related to the welding advisor. Therefore, the welding power supply A3 can reduce the amount of information stored in the memory unit 6. Furthermore, even when adding a problem and its solution to the welding advisor, the welding power supply A3 does not need to add it individually to the memory unit 6 of each welding power supply A3, and the amount of information stored in the memory unit 6 does not increase. Furthermore, information can be easily modified.

[0071] In the first to third embodiments, the present invention has been described as being applied to a welding power supply, but is not limited to this. The present invention can also be applied to thermal processing power supply devices for processes other than welding. For example, the present invention can be applied to thermal processing power supply devices that supply power to a plasma cutting system that generates plasma at the tip of a torch to cut a workpiece W, or an air arc gouging system that digs grooves by using the heat of an arc generated at the tip of a torch and a jet of compressed air.

[0072] The thermal processing power supply device according to the present invention is not limited to the above-described embodiment, and the specific configuration of each part of the thermal processing power supply device according to the present invention can be freely designed and modified in various ways. [Explanation of symbols]

[0073] A1 to A3: welding power supply, 1: power conversion unit, 2: control unit, 24: display control unit, 4: display unit, 9a: first screen, 9b: second screen, 9c: third screen, 94 to 96: operation display

Claims

1. a power conversion unit that converts input power into power for thermal processing; a control unit that controls the power conversion unit; a display unit having a display device and displaying information on a screen of the display device; Equipped with the control unit includes a display control unit that controls the display unit, The display control unit a first screen on which a plurality of problems are listed in a selectable manner; a second screen on which a plurality of detailed problems to be solved of the problem selected on the first screen are listed in a selectable manner; a third screen displaying a detailed method for solving the problem selected on the second screen; is displayed on the display unit. Power supply for thermal processing.

2. The third screen displays an operation display that allows an operation to be performed to execute the displayed solution. The power supply device for thermal processing according to claim 1.

3. When a request to control heat input during welding is selected from among the plurality of detailed problems on the second screen, the display control unit causes the third screen to display a description proposing the use of an interval function which is a function of alternately repeating an ON state in which current flows to an arc and an OFF state in which current does not flow, and causes the third screen to display a first operation display for an operation to select whether or not to use the interval function, a second operation display for adjusting an ON time which is the duration of the ON state, and a third operation display for adjusting an OFF time which is the duration of the OFF state.

3. The power supply device for thermal processing according to claim 2.

4. When "unstable welding when the power cable is extended" is selected from the plurality of detailed problems on the second screen, the display control unit causes the third screen to display a description suggesting the use of an extension mode, which is a mode that can be used when the power cable is extended to perform stable welding, and causes the third screen to display an operation display for an operation to select whether to use or not use the extension mode.

3. The power supply device for thermal processing according to claim 2.

5. the display control unit, when "I want to easily adjust the welding current" is selected on the second screen from among the plurality of detailed problems, causes the third screen to display a description proposing the use of a current adjustment function by operating a torch switch, and causes the third screen to display a first operation display for an operation to select whether or not to use the function, a second operation display for adjusting the amount of increase in the welding current when a single click is performed, and a third operation display for adjusting the amount of decrease in the welding current when a double click is performed.

3. The power supply device for thermal processing according to claim 2.

6. the display control unit displays, on the second screen, attribute information relating to effects obtained by changing parameters that determine the behavior of the thermal processing power supply device, and when the attribute information is selected, displays, on the third screen, a description proposing to increase or decrease the parameter, and displays an operation display for an operation to increase or decrease the parameter.

3. The power supply device for thermal processing according to claim 2.

7. the display control unit displays, instead of the second screen, a fourth screen on which a plurality of detailed problems to be solved of the problem selected on the first screen are selectably listed, and a fifth screen on which a plurality of more detailed problems to be solved of the detailed problem selected on the fourth screen are selectably listed, The third screen displays a more detailed method for solving the problem selected on the fifth screen.

7. The power supply device for thermal processing according to claim 2.

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