KR101984383B1 - System for controlling of temperature of basic material, method thereof and computer recordable medium storing program to perform the method - Google Patents

Abstract

The present invention relates to a system for controlling the temperature of a base material of a facility, a method for the same, and a computer readable recording medium on which a program for performing the method is recorded. A plurality of temperature sensors for transmitting the measured temperature, a heat treatment apparatus for heat-treating the welds, and a control unit for receiving the measured temperatures, and determining, based on the measured temperatures, And a main controller for controlling the temperature of the welded portion by controlling the heat treatment apparatus so as to be within a range between an upper limit temperature and a lower limit temperature set in advance according to the method And a computer readable recording medium on which a program for performing the method is recorded.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for controlling a temperature of a base material, a method for the same, and a computer-readable recording medium on which a program for performing the method is recorded.

The present invention relates to a technique for controlling the temperature of a base material, and more particularly, to a system for controlling the temperature of a base material to be subjected to a welding process in a nuclear power plant, Readable recording medium on which a program is recorded.

A weld crack is a problem that typically arises in a weld during or during welding. This prevents welding cracking by preheating before and after welding. In particular, nuclear power plant structures are even more important because their safety is emphasized. For preheating, the temperature of the whole or joint part of the workpiece is raised and welded before welding to reduce the hardness of the heat affected part and the toughness by slowing the cooling rate of the weld part. Thereby preventing cold cracking.

Korea Registered Patent No. 0904371 Registered on June 16, 2009 (Name: Automatic Preheating Device for Circumferential Weldment)

An object of the present invention is to provide a system capable of controlling a temperature of a welded portion of a base material in accordance with a result of monitoring a state of heat treatment of the base material, for example, preheating, And a computer readable recording medium having recorded thereon.

According to another aspect of the present invention, there is provided a system for controlling a temperature of a base material, the system including: a plurality of temperature sensors for measuring a temperature of a welded portion of a base material and transmitting the measured temperature by radio; And a control unit for controlling the temperature of the welding unit by controlling the heat treatment apparatus so as to be within a range between an upper limit temperature and a lower limit temperature set in advance according to the measured temperature, And a main controller.

The main controller controls the heat treatment apparatus so that the temperature of the welded portion increases over a range between an upper limit temperature and a lower limit temperature with a predetermined amount of slope over time to be equal to or higher than a minimum preheating temperature The temperature of the weld is maintained to be lower than a minimum preheat temperature which is a lower limit temperature and lower than an upper limit temperature which is an upper limit temperature until the welding is started and the welding is terminated, And the temperature is decreased in a range between an upper limit temperature and a lower limit temperature having a predetermined negative slope with time.

The heat treatment apparatus includes a flame injector for emitting a flame, a gas tank for storing gas, a gas pipe for supplying gas from the gas tank to the flame injector, a gas valve for regulating the pressure and flow rate of the supplied gas, , An oxygen tank for storing oxygen, an oxygen tube for supplying oxygen from the oxygen tank to the flame injector, an oxygen valve for regulating the pressure and flow rate of the supplied oxygen, An igniter for igniting the flame injector; and an igniter for igniting the gas valve and the oxygen gas so that the temperature of the weld portion is in a range between an upper limit temperature and a lower limit temperature set beforehand, during welding, Controlling a valve to control a pressure and a flow rate of the supplied gas, a pressure and a flow rate of the supplied oxygen, W is the flame injector and a flame controller for controlling the amount of the flame of the flame to be emitted to the weld.

Wherein each of the plurality of temperature sensors comprises a temperature sensor module for measuring the temperature of the welded part in an infrared system, a wireless communication module for wirelessly transmitting data, a sensor control for controlling the temperature to be transmitted through the communication module Module.

Further, all of the plurality of temperature sensors are characterized in that at least a part of the spots of the welded portion measured by the temperature sensor module of the temperature sensor adjacent to the spot of the welded portion where the temperature sensor module measures the temperature are overlapped.

The main controller receives a temperature measured by each of the plurality of temperature sensors from each of the plurality of temperature sensors, and if the temperature measured by the neighboring temperature sensors is different from a predetermined value or more, If it is determined that there is an error, a message indicating that there is an error is sent to the corresponding temperature sensor to the management server.

Wherein the main controller receives a temperature measured by each of the plurality of temperature sensors from each of the plurality of temperature sensors and detects an upper limit temperature and a lower limit that are preset according to a time point at which the received temperature is divided into a pre- If the temperature is outside the range between the temperatures, a message informing that there is an error in the heat treatment operation is transmitted to the management server.

And the main controller transmits the measured temperature to the management server in real time. Here, the system for controlling the temperature of the base material according to the preferred embodiment of the present invention includes a management server for receiving and storing the measured temperature from the main controller, And a portable management device connected to the management server for receiving and displaying the measured temperature.

According to another aspect of the present invention, there is provided a method of controlling a temperature of a base material, the method comprising: receiving a temperature of a welded portion of a base material measured by a plurality of temperature sensors from a plurality of temperature sensors And controlling the temperature of the welding portion by controlling the heat treatment device that radiates the flame to the welding portion such that the temperature of the welding portion is in a range between the upper limit temperature and the lower limit temperature in accordance with the measured temperature .

According to another aspect of the present invention, there is provided a system for controlling a temperature of a base material, the system including: a plurality of temperature sensors for measuring a temperature of a welded portion of a base material and transmitting the measured temperature by radio; A heat treatment apparatus for heat-treating the welded portion; and a heat treatment apparatus for receiving the measured temperature and measuring the temperature of the welded portion in a range between an upper limit temperature and a lower limit temperature, And a main controller for controlling the temperature of the welded portion by controlling the heat treatment apparatus.

The main controller controls the heat treatment apparatus so as to increase the temperature within the range between the upper limit temperature and the lower limit temperature at which the temperature of the welding portion increases at a predetermined slope with time before welding so as to be equal to or higher than a minimum preheating temperature The temperature of the welded portion is maintained to be lower than a minimum preheat temperature and lower than an upper limit temperature (Inter Pass Temperature) during welding, and after welding, the temperature of the welded portion is decreased to a predetermined slope with time The temperature difference between the upper limit temperature and the lower limit temperature is reduced.

The heat treatment apparatus includes a flame sprayer for emitting a flame, a gas tank for storing gas, a gas pipe as a path for supplying gas from the gas tank to the flame sprayer, a gas valve for regulating the pressure and flow rate of the supplied gas, An oxygen tank for storing oxygen, an oxygen tube for supplying oxygen from the oxygen tank to the flame sprayer, an oxygen valve for regulating the pressure and flow rate of the supplied oxygen, An igniter for igniting the flame sprayer; and an igniter for igniting the flame sprayer, wherein the igniter is disposed in a range between an upper limit temperature and a lower limit temperature, which are set in advance according to a control point of the welding controller, The gas valve and the oxygen valve to control the pressure and the flow rate of the supplied gas, the pressure of the supplied oxygen And a flame controller for controlling the amount of flame of the flame emitted by the flame sprayer to the weld by adjusting the flow rate.

Wherein each of the plurality of temperature sensors comprises a temperature sensor module for measuring the temperature of the welded part in an infrared system, a wireless communication module for wirelessly transmitting data, a sensor control for controlling the temperature to be transmitted through the communication module Module. In particular, each of the plurality of temperature sensors is characterized in that at least a part of a spot of a weld portion measured by a temperature sensor module of a neighboring temperature sensor is overlapped with a spot of a weld portion where the temperature sensor module measures temperature.

Wherein the main controller receives a temperature measured by each of the plurality of temperature sensors from each of the plurality of temperature sensors, and if the temperature measured by the neighboring temperature sensors is greater than or equal to a predetermined value, Is determined to be present.

Wherein the main controller transmits the measured temperature, the system comprising: a management server for receiving and storing the measured temperature from the main controller; and a control server connected to the management server for receiving and displaying the measured temperature And a portable management device connected to the management server for receiving and displaying the measured temperature.

According to another aspect of the present invention, there is provided a method of controlling a temperature of a base material, the method comprising: receiving a temperature of a welded portion of a base material measured by a plurality of temperature sensors, Calculating a temperature increase / decrease rate based on a reference line that is a line segment connecting an intermediate value of an upper limit temperature and a lower limit temperature that is set in advance by the main controller from the stored temperature before welding, during welding, and after welding, And controlling the temperature of the welded portion by controlling the heat treatment device that radiates the flame to the welded portion such that the temperature of the welded portion is in the range between the upper limit temperature and the lower limit temperature according to the temperature increase / do.

In addition, the present invention provides a computer-readable recording medium having recorded thereon a program for performing a method for monitoring and controlling a heat treatment state according to an embodiment of the present invention.

According to the present invention, it is possible to automatically control the temperature of the weld zone continuously, that is, before, during and after welding, within the upper limit temperature range and the lower limit temperature range, . In particular, according to the related art, in the case of the above-mentioned heat treatment process, when the temperature is higher than the proper temperature in the field, the temperature is manually measured from time to time, the flame adjustment or the operation of the preheating pad is stopped and the temperature is dropped again. , The temperature of the welded part is measured repeatedly by the automatic preheating pad to increase the temperature. In order to overcome this problem, it is necessary to carry out the measurement over time and the 24 hour management, There is a difficulty in temperature management. However, since the manager can monitor the temperature of the welded part through the fixed management device or the movable management device in real time, the manager can easily manage the temperature of the welded part.

1 is a view for explaining a configuration of a system for controlling temperature of a base material according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of a temperature sensor of a system for controlling the temperature of a base material according to an embodiment of the present invention.
3 and 4 are views for explaining the arrangement of the temperature sensor according to the embodiment of the present invention.
5 is a view for explaining a method for controlling the temperature of the system for controlling the temperature of the base material according to the embodiment of the present invention.
6 is a flow chart for explaining a method for controlling the temperature of the system for controlling the temperature of the base material according to the embodiment of the present invention.
7 is a view for explaining a method for controlling the temperature of the base material according to the embodiment of the present invention.

Prior to the detailed description of the present invention, the terms or words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning, and the inventor may designate his own invention in the best way It should be construed in accordance with the technical idea of the present invention based on the principle that it can be appropriately defined as a concept of a term to describe it. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the elements in the accompanying drawings are exaggerated, omitted, or schematically shown, and the size of each element does not entirely reflect the actual size.

First, a system for controlling the temperature of a base material according to an embodiment of the present invention will be described. 1 is a view for explaining a configuration of a system for controlling temperature of a base material according to an embodiment of the present invention. 2 is a block diagram illustrating a configuration of a temperature sensor of a system for controlling the temperature of a base material according to an embodiment of the present invention. 3 and 4 are views for explaining the arrangement of the temperature sensor according to the embodiment of the present invention. And FIG. 5 is a view for explaining a method for controlling the temperature of the system for controlling the temperature of the base material according to the embodiment of the present invention.

Referring to FIG. 1, a system for controlling the temperature of a base material according to an embodiment of the present invention (abbreviated as a "temperature control system" hereinafter) includes a temperature sensor 100, a heat treatment apparatus 200, (300), a management server (400), a fixed management device (500), and a mobile management device (600).

2 to 4, in the embodiment of the present invention, the welding portion 10 is a portion to be welded in the base material 1, which is a welding target facility, and is a joint portion to which the two base materials 1 are connected, . The temperature sensor 100 is a non-contact type, and is for measuring the temperature of the welding portion 10 in an infrared manner. A plurality of such temperature sensors 100 are arranged to measure the temperature of the entire region of the weld 10 according to the shape of the weld 10 of the base material 1. [ The plurality of temperature sensors 100 measure the temperature of the weld 10 and transmit the measured temperature to the main controller 300 in a wireless manner. Each of the plurality of temperature sensors 100 includes a temperature sensor module 110, a wireless communication module 120, and a sensor control module 130. The temperature sensor module 110 is for measuring the temperature of the welding portion 10 in an infrared system. The welding portion 10 continuously radiates infrared rays at a ratio having the wavelength distribution according to the temperature and the spectral emissivity of the weld portion 10. [ Accordingly, the temperature sensor module 110 transmits the intensity of the infrared radiation of the welding portion 10 to the sensor control module 130. The sensor control module 130 converts the intensity of the infrared radiation into an electrical signal, amplifies the electrical signal, and converts the signal into a digital signal. The sensor control module 130 may be, for example, a microprocessor. Meanwhile, the wireless communication module 120 is for transmitting data wirelessly. Accordingly, the sensor control module 130 can transmit the measured temperature to the main controller 300 through the wireless communication module 120. [

On the other hand, the ratio of the distance spot (D: S) is a ratio of a distance from the temperature sensor module 110 of the temperature sensor 100 to a temperature measurement object to a size including a radiation value of 90% , And this distance spot (D: S) ratio is determined according to the optical system of the temperature sensor module 110.

4, the ratio of the distance spot D (S) of the first temperature sensor 101 is a ratio of D1 to S1, and the ratio of the distance spot D (S) of the second temperature sensor 102 is D2 S2 ratio. According to an embodiment of the present invention, in order to verify the error of the temperature sensor 100, all of the plurality of temperature sensors 100 according to the distance spot (D: S) ratio of the temperature sensor 100 are connected to the temperature sensor module 110 ) The spots of the welding portion 10 for measuring the temperature are arranged so as to overlap at least a part of the spots of the welded portion measured by the temperature sensor module 110 of the neighboring temperature sensor 100. For example, when the temperature sensor module 110 of the first temperature sensor 101 detects the temperature of the spot S1 of the weld 10 and the temperature of the second temperature sensor 102 adjacent to the first temperature sensor 101, The spots S2 of the welds measured by the sensor module 110 are arranged so as to overlap with each other. The main controller 300 receives the temperature measured by each of the plurality of temperature sensors 100 from the plurality of temperature sensors 100 and then measures the temperature measured by the neighboring temperature sensors 100: If there is a temperature difference of more than a predetermined value, it can be determined that there is an error in the corresponding temperature sensor 100.

The heat treatment apparatus 200 is for heat treatment of the welded portion 10 under the control of the main controller 300. That is, the main controller 300 receives the measured temperature of the plurality of temperature sensors 100, and controls the temperature of the welded portion 10 by controlling the thermal processing apparatus 200 according to the measured temperature. According to the embodiment of the present invention, the main controller 300 controls the temperature of the welding portion 10 according to different criteria at each operation time through the heat treatment apparatus 200. Here, the working time can be divided into (B) before welding, (M) after welding, and (A) after welding. As shown in FIG. 5, according to the embodiment of the present invention, it is necessary to preheat the welding portion 10 until the welding portion 10 reaches a predetermined temperature, that is, a preheating temperature (PT) or more. Here, the minimum preheat temperature (PT) is set differently depending on the base material thickness and the material. According to the embodiment of the present invention, in order to limit the range so that the temperature of the welded portion 10 does not rise suddenly or slowly during preheating (B) and preheat, The upper limit temperature and the lower limit temperature are preset. The main controller 300 controls the heat treatment apparatus 200 so that the upper limit temperature H and the lower limit temperature L where the temperature of the welded portion B and the welded portion 10 increase with a predetermined slope with time, So as to be equal to or higher than a minimum preheating temperature. During the welding (M), the temperature of the weld 10 should be higher than the minimum preheat temperature (PT) and lower than the maximum interstep temperature (IPT). Therefore, during the welding M, the upper limit temperature H is set to the maximum interlayer temperature IPT, and the lower limit temperature L is set to the minimum preheat temperature PT. The main controller 300 controls the heat treatment apparatus 200 so that the temperature of the welded portion 10 is higher than the minimum preheat temperature PT which is the lower limit temperature L and the upper limit temperature H So as to be kept lower than the maximum interlayer temperature (IPT). After welding (A), the residual stress generated during welding should be reduced while gradually lowering the temperature of the weld 10 through post heat treatment. The stress relieving effect increases as the holding temperature is higher and the holding time is longer. Therefore, in order to limit the range so that the temperature of the welded portion 10 does not drop abruptly after welding (A), the upper limit temperature H and the lower limit temperature L decreasing to a predetermined slope with the passage of time are preset . The main controller 300 controls the heat treatment apparatus 200 so that the upper limit temperature H and the lower limit temperature L at which the temperature of the welding portion 10 decreases with a predetermined slope after welding (A) In the range between < / RTI >

The heat treatment apparatus 200 includes a flame injector 210, a gas tank 220, a gas pipe 230, a gas valve 240, an oxygen tank 250, an oxygen pipe 260, an oxygen valve 270, (280) and a flame controller (290).

The flame sprayer 210 is for emitting a flame to the weld 10. The gas tank 220 is a container for storing gas (for example, CH4). The gas pipe 230 is a path for supplying gas from the gas tank 220 to the flame injector 210. The gas valve 240 is a valve for regulating the pressure and the flow rate of the gas supplied to the flame injector 210 under the control of the flame controller 290. The oxygen tank 250 is a container for storing oxygen (O2). The oxygen pipe 260 is a path for supplying oxygen from the oxygen tank 250 to the flame injector 210. The oxygen valve 270 is a valve for controlling the pressure and the flow rate of oxygen supplied to the flame injector 210 under the control of the flame controller 290. The igniter 280 detects the supply of oxygen and gas to the flame injector 210 and automatically ignites the flame injector 210 when oxygen and gas are supplied. The flame controller 290 controls the flame controller 290 under the control of the main controller 300 so that the temperature of the welding portion 10 is divided into an upper limit temperature The pressure and the flow rate of the gas supplied through the gas valve 240 and the oxygen valve 270 and the pressure and the flow rate of the supplied oxygen are adjusted so as to be in the range between the lower limit temperature H and the lower limit temperature L, 210 control the amount of flame of the flame emitted to the weld 10. A method of controlling the temperature of the welding portion 10 of the base material through the adjustment of the amount of the flame will be described in more detail below.

The main controller 300 can transmit the temperature of the welding portion 10 received from the plurality of temperature sensors 100 to the management server 400. [ The management server 400 may then receive and store the received temperature from the main controller 300. [

The fixed type management device 500 may be, for example, a personal computer used by an administrator. The fixed type management device 500 can access the management server 400 and receive and display the temperature of the welding portion 10 stored in the management server 400. [ Accordingly, the manager can monitor the temperature change of the welded portion 10 in real time through the fixed type management device 500.

Also, the mobile management device 600 may be a portable terminal used by an administrator, for example, a smart phone. The portable management device 600 can access the management server 400 and receive and display the temperature of the welding portion 10 stored in the management server 400 according to the input of the manager. Accordingly, the manager can monitor the temperature change of the welding portion 10 through the mobile management device 600 in real time.

On the other hand, the main controller 300 receives the temperatures measured by the plurality of temperature sensors 100 from the plurality of temperature sensors 100, and if the temperatures measured by the neighboring temperature sensors are different from each other by a predetermined value or more , It is determined that an error has occurred in the corresponding temperature sensor 100. If it is determined that there is an error, a message indicating that an error has occurred in the corresponding temperature sensor 100 may be transmitted to the management server 400. [ The main controller 300 also receives a temperature measured by each of the plurality of temperature sensors 100 from each of the plurality of temperature sensors 100 and determines whether the received temperature is before, If it is out of the range between the upper limit temperature and the lower limit temperature which are set in advance, a message informing that there is an error in the heat treatment operation can be transmitted to the management server 400. Then, the management server 400 may transmit a message to the fixed type management device 500 and the mobile type management device 600 informing of the temperature sensor error or the heat treatment operation error. Then, the fixed management device 500 and the mobile management device 600 output information on such an error, and the administrator can confirm the occurrence of the temperature sensor error or the heat treatment operation error (error) through the fixed management device 500 and the mobile management device 600 And can cope with it.

Next, a method for controlling the temperature of the welding portion 10 of the base material through the control of the amount of the flame will be described in more detail. 6 is a flow chart for explaining a method for controlling the temperature of the system for controlling the temperature of the base material according to the embodiment of the present invention. 7 is a view for explaining a method for controlling the temperature of the base material according to the embodiment of the present invention.

Referring to FIGS. 3 and 4, a plurality of temperature sensors 100 are disposed at a predetermined distance from the weld 10. In addition, the plurality of temperature sensors 100 divide the welding portion 10 into a plurality of spots and measure the temperature thereof. That is, each of the plurality of temperature sensors 100 divides the welding portion 10 into a plurality of spots, and measures temperatures of different spots. In this case, the spot where the temperature sensor module 110 of the temperature sensor 100 measures the temperature at the welding portion 10 is determined by the temperature sensor module 110 of the neighboring temperature sensor 100, A plurality of temperature sensors 100 are arranged so that at least a part of the spots is overlapped with the spots.

Accordingly, each of the plurality of temperature sensors 100 continuously measures the temperature of the spot, which is a part of the weld 10, and transmits the measured temperature continuously. The temperature sensor 100 may include an identifier for distinguishing the temperature sensor 100 transmitting the measured temperature from the other temperature sensor 100 and a position and temperature at which the temperature sensor 100 is disposed, The position information indicating the position of the spot measured by the sensor 100 and the measured time can be transmitted at the same time. Then, in step S110, the main controller 300 receives the measured temperatures from the plurality of temperature sensors 100 and stores them according to the time sequence.

Then, the main controller 300 calculates the upper limit temperature H and the lower limit temperature H, which are previously set for each operation time divided into the welding pre-welding process B, the welding process M, and the post-welding process A, The temperature increase / decrease ratio is calculated based on the reference line C, which is a line segment connecting the median values of the temperature (L). In Fig. 7, a portion which is a part of Fig. 5 is shown. The reference line C is obtained in accordance with the upper limit temperature H and the lower limit temperature L of the pre-welded wire (B). Further, it is assumed that the reference symbol 'ST' is the temperature of the welded portion 10 which is continuously measured with time.

으로 산출될 수 있다. 도시된 바와 같이, y1은 온도 증감율을 구하는 시점(t1)에서 측정된 용접부(10)의 온도를 나타내는 점(P1)에서 기준선(C)에 대한 수직한 직선, 즉, 수선의 길이를 나타낸다. 이러한 y1은 기준선(C) 대비 온도가 감소하고 있기 때문에 음의 값을 가진다. 또한, x1은 수선의 발로부터 소정 시점(d1) 이전(t1-d1)에 측정된 용접부(10)의 온도와 기준선(C)이 만나는 점(P2)까지의 길이를 의미한다. y1이 음의 값을 가지기 때문에,

또한 음의 값을 가지며, 이는 온도가 감소하고 있음을 나타낸다. According to the embodiment of the present invention, in order to prevent the temperature of the welded portion 10 from exceeding the range of the upper limit temperature H and the lower limit temperature L, the increase / decrease ratio is calculated based on the reference line C. Referring to Fig. 7, in the embodiment of the present invention, the temperature increase / decrease ratio at t1 is

. ≪ / RTI > As shown in the figure, y1 represents a straight line perpendicular to the reference line C at a point P1 indicating the temperature of the weld 10 measured at the time t1 at which the temperature increase / decrease rate is obtained, that is, the length of the waterline. This y1 has a negative value because the temperature of the reference line C is decreasing. X1 denotes the length from the foot of the waterline to the point P2 at which the reference line C meets the temperature of the weld 10 measured before the predetermined point of time d1 (t1-d1). Since y1 has a negative value,

It also has a negative value, indicating that the temperature is decreasing.

으로 산출될 수 있다. 여기서, y2는 온도 증감율을 구하는 시점(t2)에서 측정된 용접부(10)의 온도를 나타내는 점(P3)에서 기준선(C)에 대한 수직한 직선, 즉, 수선의 길이를 나타낸다. 이러한 y1은 기준선(C) 대비 온도가 증가하고 있기 때문에 양의 값을 가진다. 또한, x2는 수선의 발로부터 소정 시점(d2) 이전(t2-d2)에 측정된 용접부(10)의 온도와 기준선(C)이 만나는 점(P4)까지의 길이를 나타낸다. y2가 양의 값을 가지기 때문에,

또한 양의 값을 가지며, 이는 온도가 증가하고 있음을 나타낸다. 한편, 도 7을 통해 용접전(B)의 경우에만 예를 들어 설며하였지만, 용접중(M) 그리고 용접후(E)의 경우에도 동일하게 기준선(C)을 기준으로 온도 증감율을 산출할 수 있다. The temperature increase / decrease rate at t2 is

. ≪ / RTI > Here, y2 represents a straight line perpendicular to the reference line C at the point P3 representing the temperature of the weld 10 measured at the time t2 at which the temperature increase / decrease rate is obtained, that is, the length of the waterline. This y1 has a positive value because the temperature is increased with respect to the reference line (C). X2 represents the length from the foot of the waterline to the point P4 at which the reference line C meets the temperature of the weld 10 measured before the predetermined point of time d2 (t2-d2). Since y2 has a positive value,

It also has a positive value, indicating that the temperature is increasing. 7, the temperature increase / decrease rate can be calculated on the basis of the reference line C in the case of (M) and (E) after welding, .

As described above, the main controller 300 can calculate the rate of increase or decrease using the temperature for a predetermined period of time based on the reference line C at the stored temperature according to the time order. This temperature increase / decrease rate indicates the degree of increase or decrease of the temperature of the welded portion 10 from the temperature indicated by the reference line C for a predetermined time.

Then, in step S230, the main controller 300 generates a control signal according to the change rate calculated in advance so that the temperature of the welding portion 10 is in the range between the upper limit temperature H and the lower limit temperature L. This control signal is for adjusting the intensity of the flame such that the temperature of the weld 10 increases or decreases in inverse proportion to the temperature increase / decrease rate of the weld 10 so as to fall within the range between the upper limit temperature and the lower limit temperature. Therefore, the control signal includes the temperature increase / decrease rate.

Next, the main controller 300 transmits a control signal including the temperature increase / decrease rate to the flame controller 290 in step S240. The flame controller 290 controls the gas valve 240 and the oxygen valve 270 so as to be in the range between the upper limit temperature H and the lower limit temperature L in inverse proportion to the temperature increase / The pressure and flow rate of the gas, the pressure and flow rate of the supplied oxygen, and the flame sprayer 210 adjusts the flame amount of the flame irradiated to the weld 10.

Meanwhile, the method for controlling the temperature of the base material according to the embodiment of the present invention described above may be implemented in a form of a readable program through various computer means and recorded on a computer-readable recording medium. Here, the recording medium may include program commands, data files, data structures, and the like, alone or in combination. Program instructions to be recorded on a recording medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. For example, the recording medium may be a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, an optical medium such as a CD-ROM or a DVD, a magneto-optical medium such as a floppy disk magneto-optical media, and hardware devices that are specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions may include machine language wires such as those produced by a compiler, as well as high-level language wires that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

According to the present invention, it is possible to automatically control the temperature of the weld zone continuously, that is, before, during and after welding, within the upper limit temperature range and the lower limit temperature range, . In particular, according to the related art, in the case of the above-mentioned heat treatment process, when the temperature is higher than the proper temperature in the field, the temperature is manually measured from time to time, the flame adjustment or the operation of the preheating pad is stopped and the temperature is dropped again. , The temperature of the welded part is measured repeatedly by the automatic preheating pad to increase the temperature. In order to overcome this problem, it is necessary to carry out the measurement over time and the 24 hour management, There is a difficulty in temperature management. However, since the manager can monitor the temperature of the welded part through the fixed management device or the movable management device in real time, the manager can easily manage the temperature of the welded part.

While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims.

1: base material 10: welded part
100: Temperature sensor 110: Temperature sensor module
120: wireless communication module 130: sensor control module
200: heat treatment apparatus 210: flame sprayer
220: gas tank 230: gas pipe
240: gas valve 250: oxygen tank
260: Oxygen pipe 270: Oxygen valve
280: Igniter 290: Flame controller
300: main controller 400: management server
500: fixed type management device 600: movable type management device

Claims (8)

A system for controlling the temperature of a base material,
A plurality of temperature sensors for measuring the temperature of the welded portion of the base material and transmitting the measured temperature by radio;
A heat treatment apparatus for heat-treating the welded portion; And
And controls the heat treatment apparatus so as to be in a range between an upper limit temperature and a lower limit temperature set in advance according to a time point of the work divided into a pre-weld, a weld, and a post-weld according to the measured temperature, The temperature is controlled,
If it is judged that there is an error in the corresponding temperature sensor if the temperatures measured by the neighboring temperature sensors differ from each other by a predetermined value or more after receiving the temperature measured by each of the plurality of temperature sensors from each of the plurality of temperature sensors And a main controller for controlling the temperature of the base material. The method according to claim 1,
The main controller controls the heat treatment apparatus
The preheating temperature is increased within a range between an upper limit temperature and a lower limit temperature at which the temperature of the welding portion increases with a predetermined slope with time before welding so as to be equal to or higher than a minimum preheating temperature,
During welding, the temperature of the weld is kept higher than the minimum preheat temperature which is the lower limit temperature and lower than the upper limit temperature (Inter Pass Temperature)
And after welding, the temperature of the weld is reduced in a range between an upper limit temperature and a lower limit temperature at which the temperature decreases with a predetermined slope with time. 3. The method of claim 2,
The heat treatment apparatus
A flame sprayer for emitting a flame;
A gas tank for storing gas;
A gas pipe serving as a path for supplying gas from the gas tank to the flame sprayer;
A gas valve for regulating a pressure and a flow rate of the supplied gas;
An oxygen tank for storing oxygen;
An oxygen pipe as a path for supplying oxygen from the oxygen tank to the flame injector;
An oxygen valve for regulating the pressure and flow rate of the supplied oxygen;
An igniter for igniting the flame sprayer when the oxygen and the gas are supplied; And
The gas valve and the oxygen valve are controlled such that the temperature of the welded portion is in a range between an upper limit temperature and a lower limit temperature that are set in advance according to the operation time before welding, And a flame controller for controlling the amount of the flame of the flame emitted by the flame sprayer to the weld by controlling the pressure and the flow rate of the supplied gas and the pressure and the flow rate of the supplied oxygen. . The method according to claim 1,
Each of the plurality of temperature sensors
A temperature sensor module for measuring the temperature of the welded part in an infrared system; And
A wireless communication module for wirelessly transmitting data; And
And a sensor control module for controlling the measured temperature to be transmitted through the communication module,
Wherein each of the plurality of temperature sensors is arranged such that at least a part of a spot of a weld portion measured by a temperature sensor module of a neighboring temperature sensor is overlapped with a spot of a weld portion where the temperature sensor module measures temperature. ≪ / RTI > delete The method according to claim 1,
The main controller transmits the measured temperature,
The system
A management server receiving and storing the measured temperature from the main controller;
A fixed management device connected to the management server to receive and display the measured temperature; And
And a portable management device connected to the management server for receiving and displaying the measured temperature. A method for controlling a temperature of a base material,
The main controller receiving temperature of a welded portion of the base material measured by a plurality of temperature sensors and storing the received temperature in a time sequence;
Calculating a temperature increase / decrease rate based on a reference line, which is a line segment connecting the upper limit temperature and the lower limit temperature, which is set in advance by the main controller, from the stored temperature to the operating time divided into welding, welding, and welding; And
And controlling the temperature of the welded portion by controlling the heat treatment device that radiates the flame to the welded portion such that the temperature of the welded portion is within the range between the upper limit temperature and the lower limit temperature according to the temperature increase / decrease rate of the main controller ,
And determining that there is an error in the corresponding temperature sensor if the temperature measured by the neighboring temperature sensors among the plurality of temperature sensors is greater than or equal to a predetermined value by the main controller / RTI > 10. A computer-readable recording medium on which a program for performing a method for controlling a temperature of a base material according to claim 7 is recorded.

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