KR102019853B1 - Welding temperature control system reflecting emissivity of base material of laser welding machine and control method thereof - Google Patents

Abstract

The present invention discloses a welding temperature control system reflecting the base material emissivity of the laser welding machine and a control method thereof. The present invention is inherent in the welding temperature is set when the laser welding temperature for the base material to be welded is set It is configured to reflect the emissivity. Accordingly, the welding temperature measured in real time during laser welding is compared with the laser welding temperature which is the reference reflecting the emissivity, and according to the comparison result, temperature noise, temperature noise, Increasing the quality satisfaction of the welded product while preventing the breakage of the base materials during laser welding due to incorrect temperature calculations while affecting the minimum test temperature value.

Description

Welding temperature control system reflecting emissivity of base material of laser welding machine and control method

The present invention relates to a laser welding machine, and more particularly, in setting the laser welding temperature for the base materials, the inherent emissivity of the base materials is reflected in the set welding temperature, and the laser welding temperature reflecting the emissivity is reflected in real time during laser welding. The present invention relates to a welding temperature control system and a control method of reflecting the base material emissivity of a laser welding machine to allow an output level of a laser beam to be added to or subtracted from the measured welding temperature.

In general, the laser welder allows welding of plastics using a laser, which utilizes the transparency and absorptivity of a plastic material of a laser beam having a predetermined wavelength.

That is, when the laser beam is transmitted to one base material having transparency, the laser welder vibrates and generates heat by molecules activated by the laser beam in the other base material having absorption. As another base material having absorbency is melted, laser welding of the base materials is possible, and such a laser welding machine is disclosed in Korean Laid-Open Patent Publication Nos. 10-2006-0045335 and 10-2011-0002415 (2011.01). .07).

The laser welding machine as described above is a fixed method for outputting the output level for a welding product in a fixed state. For example, when the output level for welding plastic is 40 watts, the output is 40 watts while maintaining a constant speed. The laser beam is to be irradiated.

However, in the state where the output level suitable for the product is determined as described above, if there are defective elements (eg, cracks, product bending, product damage) on the product itself, conventionally, when the laser welding operation is completed, There is a problem that can not identify the defective element, this conventionally had a problem that can only be confirmed by radiation (X-ray) to check the defective element of the product itself.

Accordingly, the "laser heating apparatus" of Japanese Patent Publication No. 5042013 (July 20, 2012) has conventionally been disclosed, which lowers the laser power or stops the laser oscillation when a sudden temperature change is detected. The laser power is controlled so that the temperature of the heating object becomes a preset set temperature.

That is, the prior patent is to laser weld the base materials by controlling the laser output in accordance with the measured welding temperature.

However, in the case of the base materials where laser welding is performed, the laser beam is irradiated to plastic products having different permeability and absorptivity to activate molecules in the absorbing layer, and the heat generated by the kinetic energy indirectly melts the transmitting layer material to bond the two base materials. In this case, as shown in the accompanying Figure 1, one of the most important factor when the welding temperature measurement is made is the intrinsic emissivity of the base material to be measured temperature.

In other words, emissivity is the rate at which energy is emitted from a material, and when a black body receives 100% of energy from outside, it absorbs 100% of all energy and emits 100% of energy as it is. It is difficult and similarly used as a standard for calibration, but not all objects have black body properties, especially the substrates that require laser welding have little black body properties.

Accordingly, conventionally, when laser welding the base materials, the temperature for the emissivity of each base material could not be corrected.

For example, when laser welding a base material having an emissivity of 0.8 and a welding temperature of 100 ° C. and measuring the welding temperature, the measured welding temperature is measured at 80 ° C. due to the emissivity of 0.8 and a temperature deviation of 20 ° C. Will occur.

Thus, conventionally, in a state in which the temperature deviation reflecting the emissivity is not corrected, the temperature of 80 ° C. in which emissivity is reflected is not used as a set temperature as a reference, and the temperature of 100 ° C. in which emissivity is not reflected Since the laser output level is controlled by using the set temperature, the wrong temperature calculation is made while affecting the temperature noise and the minimum test temperature value, thereby inducing the maximum output of the laser welder. There was a problem that is broken.

Publication No. 10-2006-0045335 (2006.05.17)

Publication No. 10-2011-0002415 (2011.01.07)

Japanese Patent Publication No. 5042013 (July 20, 2012)

Therefore, the present invention is to improve the conventional problems as described above, the object of the present invention, when setting the laser welding temperature for the base material, by configuring the intrinsic emissivity of the base material is reflected in the welding temperature is set, the laser The welding temperature measured at the time of welding can be compared with the laser welding temperature which is the standard reflecting the emissivity, and according to the comparison result, it is possible to improve the problem that the welding parts of the base materials are damaged during laser welding while adjusting the output level of the laser beam. To provide a welding temperature control system that reflects the base material emissivity of a laser welding machine and a method of controlling the same.

Welding temperature control system reflecting the base material emissivity of the laser welding machine of the present invention for achieving the above object, the laser head for irradiating the laser beam to the base material to be welded while being connected to the laser generating unit and the optical fiber cable divided into first and second head parts And a collimation lens configured to adjust the laser beam guided through the optical fiber cable in parallel; And a first reflective lens for reflecting the laser beam adjusted in parallel from the collimation lens in a first direction. And a second reflecting lens for reflecting a laser beam reflected from the first reflecting lens in a first direction in a second direction perpendicular to the first direction; A first focus lens for collecting a focal point of the laser beam reflected from the second reflective lens in a second direction and irradiating the substrate with the base materials for laser welding; A filter lens for passing only the radiation beam of a specific wavelength band emitted from the base materials when the laser welding is performed by the laser beam irradiated to the base materials through the first focus lens; A second focus lens for focusing a specific wavelength radiation beam passing through the filter lens; An infrared temperature sensor for measuring a laser welding temperature of the welding portions of the base materials from the radiation beam focused from the second focus lens; The second head unit includes a data converter converting and outputting an analog laser welding temperature measured by the infrared temperature sensor into a digital signal; And a control terminal for controlling the laser beam output level of the laser generation unit by comparing the digital signal of the measured laser deposition temperature converted and output from the data conversion unit with a welding temperature as a reference. And a temperature compensating unit configured to connect the control terminal and correct the welding temperature as a reference by reflecting emissivity information of the base materials to be welded; And comparing the laser welding temperature measured by the infrared temperature sensor with a welding temperature which is a reference value reflecting the emissivity corrected by the temperature correction unit, and increasing or decreasing the laser beam output level of the laser generation unit. A laser output controller; It will be configured to include.

The control terminal may further include a memory unit configured to list and store information on the emissivity of the base materials, and the temperature correction unit stores emissivity information corresponding to the input base materials when the information of the base materials to be welded is input. And a temperature setting program for searching and extracting the emissivity information stored in the unit and setting a welding temperature, which is a reference in which the extracted emissivity information is reflected.

The laser output controller may include a control program configured to display an input unit for setting a welding temperature which is a reference of the base materials to be welded, wherein the input unit comprises: first and second input windows configured to set maximum and minimum ranges of welding temperatures; A third input window for setting a minimum signal strength of the laser beam by the laser generator; A fourth input window for inputting emissivity information on the base material; And a fifth input window displaying a welding temperature correction value as a reference according to the emissivity information of the base material input to the fourth input window. It will be configured to include.

In addition, the emissivity information for the base material is inherent emissivity information of the base material directly input by the operator.

According to another aspect, in the welding temperature control method in which the base material emissivity of the laser welding machine of the present invention is reflected, (a) setting the maximum and minimum temperature range of laser welding through an input unit displayed on the screen of the control terminal, Setting a welding temperature, which is a reference for reflecting the inherent emissivity of the resin; (b) irradiating the laser beam generated through the laser generating unit to the base materials to be welded by the laser head after the welding temperature which is the reference of the step (a) is set; (c) when the laser beam is irradiated to the base materials from the step (b), the infrared temperature sensor provided at the laser head measures the welding temperature according to the radiation of the laser beam emitted from the base materials; (d) comparing the welding temperature of the base materials measured in real time from the step (c) with the welding temperature which becomes a reference set by reflecting the emissivity from the step (a); (e) From the step (d), the laser output control unit 92 controls the laser output level of the laser generation unit when the welding temperature measured in real time is greater than the welding temperature which is the reference value of the emissivity, and the welding temperature measured in real time is the emissivity. Up-controlling the laser output level of the laser generation unit if the reflected welding temperature is equal to or smaller than the reflected reference; Including to proceed.

In addition, in the step (a), the welding temperature setting as a reference may include: extracting emissivity information corresponding to the input base material when the type of base material to be welded is input from the memory unit, and providing the extracted temperature to the temperature compensation unit; And setting the welding temperature as a reference by reflecting the emissivity information of the base material extracted from the process. It will include.

Further, in the step (a), the welding temperature setting as a reference may include: inputting unique emissivity information of the base material to be welded through an input unit displayed on the screen of the control terminal; And setting a welding temperature as a reference by reflecting the emissivity information of the base material according to the emissivity information input to the input unit. Including to proceed.

As described above, the present invention is configured to reflect the inherent emissivity of the base materials in the set welding temperature when setting the laser welding temperature for the base material to be welded, through which the welding temperature measured in real time during laser welding is reflected This results in comparison with the laser welding temperature, and according to the comparison result, the welding part of the base materials at the time of laser welding due to the wrong temperature calculation while affecting the temperature noise and the minimum test temperature value while adjusting the output level of the laser beam. The effect of preventing the breakage can be expected.

1 is a conceptual diagram for emissivity as an embodiment of the present invention.
Figure 2 is a schematic configuration of a laser welding machine for correcting the welding temperature as a reference by reflecting the emissivity in an embodiment of the present invention.
Figure 3 is an illustration of the unique emissivity table having a base material in an embodiment of the present invention.
4 is a screen showing a correction value of a welding temperature (Terperature offset) as a reference from the emissivity value input (Emission1) in the embodiment of the present invention.
5 is a measurement graph of the welding temperature and the welding temperature of the real-time measurement and the laser beam output state to which the intrinsic emissivity of the base material is applied as an embodiment of the present invention.
Figure 6 is a flow chart of the welding temperature control method in which the base material emissivity of the laser welding machine is reflected in the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a conceptual diagram of the emissivity in an embodiment of the present invention, Figure 2 is a schematic configuration diagram of a laser welding machine for correcting the welding temperature which is a reference by reflecting the emissivity in an embodiment of the present invention, Figure 3 is the present invention 4 is an exemplary diagram of a unique emissivity table having a base material, and FIG. 4 is a screen diagram showing a correction value of a welding temperature (Terperature offset), which is a reference from the emissivity value input (Emission1), according to an embodiment of the present invention. Drawing.

1 to 4, the welding temperature control system reflecting the base material emissivity of the laser welding machine according to an embodiment of the present invention, the laser head 10 and the laser head connected by the optical fiber cable (100) 20) and a data converter 30 and a control terminal 40 connected to the laser head 20.

Although not shown in the drawing, the laser generator 10 includes a laser oscillator and a laser diode, and outputs laser beam energy to the laser head 20 through the optical fiber cable 100 for laser welding of base materials. It is made up.

That is, the laser oscillator included in the laser generator 10 is configured to supply electrical energy according to the control signal of the control terminal 40, and the laser diode is configured to supply electrical energy supplied from the laser oscillator to laser beam energy. The conversion to and output is conventional, the detailed description thereof will be omitted below.

The laser head 20 collects the focal point of the laser beam energy output through the optical fiber cable 100 and irradiates it to the base material for laser welding, and sets the welding temperature from the radiation energy of the laser beam radiated from the base material in real time. The measurement is divided into a first head portion H1 connected to the optical fiber cable 100 and a second head portion H2 formed on the side of the first head portion H1.

In this case, a collimation lens 21 for adjusting a laser beam guided through the optical fiber cable 100 in parallel to the first head portion H1, and parallel to the collimation lens 21. The first reflex lens 22 reflecting the adjusted laser beam in the first direction P1 (horizontal direction) is configured.

The second head portion H2 has a laser beam reflected from the first reflective lens 22 in the first direction P1 in a second direction P2 perpendicular to the first direction P1. A second reflecting lens 23 for reflecting and a focusing of the laser beam (C1) reflected in the second direction (P2) from the second reflecting lens 23 to collect the focus and irradiates it to the base material for laser welding A radiation beam C2 of a specific wavelength band radiated from the base materials during laser welding by a focus lens 24 and a laser beam C1 irradiated to the base materials through the focus lens 24. Only a filter lens 25 passing through the bay, a second focus lens 26 focusing the specific wavelength radiation beam C2 passing through the filter lens 25, and the second focus lens 26. Measurement of laser welding temperature at the welding site of the base materials from the focused radiation beam It is placed to configure the infrared temperature sensor 27.

Here, the infrared temperature sensor 27 detects a wavelength band of the radiation beam C2 refracted from the second focus lens 26 and then measures the temperature of the detected radiation beam C2 and converts the data. It outputs to the part 30.

The data converter 30 is connected to the second head H2, and converts and outputs an analog laser welding temperature measured by the infrared temperature sensor 27 to the control terminal 40 as a digital signal. It is made up.

The control terminal 40 is configured to control the laser beam output level of the laser generation unit by comparing the digital signal of the measured laser welding temperature which is converted and output from the data conversion unit 30 with the reference welding temperature. .

At this time, the control terminal 40, as shown in Figure 3, from the temperature correction portion 41 for correcting the welding temperature as a reference by reflecting the emissivity information of the base material to be welded, and from the infrared temperature sensor 27 A laser output control unit for comparing the measured laser welding temperature with a welding temperature which is a reference value reflecting the emissivity corrected by the temperature correction unit 41 to raise or lower the laser beam output level of the laser generating unit ( 42), and may further include a memory unit 43 which lists and stores information on the emissivity of the base materials.

The temperature compensator 41 searches for and extracts emissivity information stored in the memory unit 43 to input emissivity information corresponding to the input base materials when the information of the base materials to be welded is input, and reflects the extracted emissivity information. The temperature setting program which sets the welding temperature to become is mounted.

On the other hand, the laser output control unit 42 is equipped with a control program for displaying an input unit 421 for setting the welding temperature as a reference of the base material to be welded, the input unit 421 as shown in FIG. First and second input windows 421a and 421b for setting a maximum and minimum range of welding temperature, a third input window 421c for setting a minimum signal strength of the laser beam by the laser generating unit, and a base material. Fourth input window 421d for inputting the emissivity information for the second, and the fifth input window 421e for displaying the welding temperature correction value as a reference according to the emissivity information of the base material input to the fourth input window 421d It is configured to be displayed.

Here, the emissivity information for the base material may be unique emissivity information of the base material directly input by the operator.

For example, when the welding target base material is selected and the input unit 421 is displayed on the screen of the control terminal 40 as shown in FIG. 4, the operator may input the first and second input windows 421a of the input unit 421. The maximum and minimum ranges for the welding temperature of the selected base material are input to the 421b, while the minimum signal strength of the laser beam by the laser generator is input to the third input window 421c.

Next, the operator inputs unique emissivity information of the selected base material into the fourth input window (Emission1) 421d of the input unit 421.

Then, in the fifth input window 421e of the input unit 421, a temperature correction value (eg, Terperature offset = 1 ° C.) for correcting the welding temperature, which is a reference for the base material, is displayed by the emissivity information. While the displayed temperature correction value is reflected in the welding temperature of the base material, it is possible to reset the welding temperature as a reference compared with the welding temperature measured in real time during the welding of the base material.

Meanwhile, a welding temperature control method implemented as a welding temperature control system in which the base material emissivity of the laser welding machine according to the embodiment of the present invention configured as described above will be described with reference to FIGS. 1 to 6.

First, the base material to be welded is selected and the selected base material is input to the control terminal 40.

Then, the temperature setting program of the temperature compensator 41 configured in the control terminal 40 searches for and extracts emissivity information corresponding to the input base material from the memory unit 43 and extracts the extracted emissivity information. It is to set the welding temperature which is the reflected standard.

Here, although the above description has been described as inputting the type of the base material to be welded, the operator directly inputs the control terminal 40 without listing the emissivity information in the memory unit 43 (eg, keyboard, mouse). The emissivity information of the base material may be input to the fourth input window 421d of the input unit 421 through the reference numeral).

That is, the operator first selects the base material to be fused, and the input unit 421 as shown in FIG. 4 with reference to the emissivity table of FIG. 3 attached to the material properties of the selected base materials and the emissivity information uniquely selected by the selected base materials. Manual input may be directly performed through the fourth input window 421d.

Then, according to the emissivity information input through the fourth input window 421d, the temperature compensator 41 configured in the control terminal 40 corrects the welding temperature as a reference to reflect the input emissivity information. This is displayed on the fifth input window 421d of the input unit 421.

Next, in a state in which a welding temperature as a reference in which emissivity information is reflected as described above is set, the first and second head portions H1 and H2 of the laser head are brought close to the base material to be welded to the control terminal 40. Through the laser output control unit 42 is configured to output the laser beam of the laser generating unit.

Then, the laser beam output through the laser generation unit passes through the collimation lens 21 in the first head portion H1 through the optical fiber cable 100, wherein the collimation lens 21 is the optical fiber The laser beam guided through the cable 100 is adjusted in parallel and then guided to the first reflective lens 22.

Then, the first reflective lens 22 may reflect the laser beam adjusted in parallel from the collimation lens 21 in the first direction P1, that is, in the direction of the second head portion H2.

Next, the second reflecting lens 23 in the second head portion H2 receives a second laser beam reflected from the first reflecting lens 22 in the first direction P1 orthogonal to the first direction. While reflecting in the direction P2, the first focus lens 24 positioned at the lower end of the second reflecting lens 23 is reflected from the second reflecting lens 23 in the second direction P2. After collecting the focus of (C1), it can be irradiated to the base material to be laser welded.

In this case, in the state where laser welding is performed by the laser beam C1 irradiated to the base material through the first focus lens 24, the radiation beam C2 is emitted from the base material, and the beam C2 is thus radiated. Is introduced into the filter lens 25 through the first focusing lens 24 and the second reflecting lens 23, and thus the filter lens 25 removes only the radiation beam of a specific wavelength band from the radiation beam C2. 2 is passed through the focus lens 26.

Then, the second focus lens 26 collects the focal point of the specific wavelength band radiation beam passing through the filter lens 25 and provides it to the infrared temperature sensor 27, wherein the infrared temperature sensor 27 is the After measuring the laser welding temperature of the analog to the welding portion of the base material from the radiation beam focused from the second focus lens 26 and to provide it to the data converter 30.

The data converter 30 converts the analog radiation beam temperature measured in real time from the infrared temperature sensor 27 into a digital signal and outputs the same to the laser output controller 42 of the control terminal 40. do.

At this time, the laser output controller 42 is provided with the welding temperature information serving as a reference in which the emissivity information is reflected by the temperature compensator 41, so that the laser output controller 42 is provided from the infrared temperature sensor 27. The control program for increasing or decreasing the laser beam output level of the laser generating unit is compared by comparing the measured laser welding temperature with a welding temperature which is a standard reflecting the emissivity corrected from the temperature correction unit 41. It works.

That is, when the welding temperature measured in real time is greater than the welding temperature at which the emissivity is reflected, the laser output controller 42 controls the laser output level of the laser generating unit down, but the welding temperature measured in real time is based on the emissivity. When the welding temperature is equal to or smaller than the welding temperature, the laser output level of the laser generating unit is controlled up, and the welding part of the base material can be welded without damage within a minimum and maximum temperature range according to the characteristics of the base material. will be.

As an example, it is assumed that a base material having a welding temperature of 100 ° C. and an emissivity of '0.8' is selected as a welding target, and the laser output level of the laser generating unit is controlled to 50W.

Then, when the emissivity '0.8' is not reflected in the welding temperature of 100 ° C., the temperature of 80 ° C. reflecting the emissivity is not set as the reference welding temperature, but the temperature of 100 ° C. without the emissivity is used as a reference. In relation to use as the set temperature, the welding temperature measured in real time by the infrared temperature sensor 27 is compared with the reference welding temperature of 100 ℃.

At this time, the laser output level of the laser generating unit is output to a maximum 50W until reaching the welding temperature of 100 ℃ measured in real time by the infrared temperature sensor 27, but in practice the temperature of 80 ℃ reflecting the emissivity is the reference welding Since the temperature, the laser output level of the laser generating unit is to be output to 40W lower than that 50W according to the reference welding temperature of 80 ℃.

On the other hand, in the embodiment of the present invention, when the emissivity '0.8' is reflected in the welding temperature of 100 ℃, it is used to set the temperature of 80 ℃ reflecting the emissivity as the reference welding temperature, in the infrared temperature sensor 27 The welding temperature measured in real time is compared with the reference welding temperature of 80 ℃.

At this time, the laser output level of the laser generating unit is output to a maximum 50W until reaching the welding temperature of 100 ℃ measured in real time by the infrared temperature sensor 27, but in practice the temperature of 80 ℃ reflecting the emissivity is the reference welding As the temperature, the laser output level of the laser generation unit can be controlled by outputting down to 40W lower than 50W according to the reference welding temperature of 80 ℃, according to the embodiment of the present invention, the temperature noise (temperature noise) In addition, the problem of inducing the maximum output of the laser welder due to incorrect temperature calculation can be improved while influencing the minimum test temperature value.

Although the technical idea of the welding temperature control system and the method of controlling the same reflecting the base material emissivity of the laser welding machine of the present invention has been described with the accompanying drawings and the accompanying drawings, the present invention has been described by way of example. It is not intended to limit the invention.

Accordingly, the present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Of course, such changes are within the scope of the claims.

10; A laser generator 20; Laser head
21; Collimation lens 22; First reflective lens
23; A second reflective lens 24; First focus lens
25; Filter lens 26; Second focus lens
27; Infrared temperature sensor 30; Data converter
40; Control terminal 41; Temperature Compensation
42; A laser output controller 421; Input
421a; A first input window 421b; 2nd input window
421c; Third input window 421d; 4th input window
421e; A fifth input window 43; Memory
100; Fiber optic cable

Claims (7)

The laser head which is connected to the laser generating unit and the optical fiber cable and irradiates the laser beam with the base material to be welded is divided into first and second head parts, and the first head part is parallel to the laser beam guided through the optical fiber cable. A collimation lens to adjust; And a first reflective lens for reflecting the laser beam adjusted in parallel from the collimation lens in a first direction. And a second reflecting lens for reflecting a laser beam reflected from the first reflecting lens in a first direction in a second direction perpendicular to the first direction; A first focus lens for collecting a focal point of the laser beam reflected from the second reflective lens in a second direction and irradiating the substrate with the base materials for laser welding; A filter lens for passing only the radiation beam of a specific wavelength band emitted from the base materials when the laser welding is performed by the laser beam irradiated to the base materials through the first focus lens; A second focus lens for focusing a specific wavelength radiation beam passing through the filter lens; An infrared temperature sensor for measuring a laser welding temperature of the welding portions of the base materials from the radiation beam focused from the second focus lens; Constitute
The second head unit includes a data converter converting and outputting an analog laser welding temperature measured by the infrared temperature sensor into a digital signal; And a control terminal for controlling the laser beam output level of the laser generation unit by comparing the digital signal of the measured laser deposition temperature converted and output from the data conversion unit with a welding temperature as a reference. Configure the connection,
The control terminal includes a temperature correction unit for correcting the welding temperature as a reference by reflecting the emissivity information of the base material to be welded; And comparing the laser welding temperature measured by the infrared temperature sensor with a welding temperature which is a reference value reflecting the emissivity corrected by the temperature correction unit, and increasing or decreasing the laser beam output level of the laser generation unit. A laser output controller; Welding temperature control system that reflects the base material emissivity of the laser welding machine comprising a. The method of claim 1,
The control terminal further comprises a memory unit for listing and storing the information on the emissivity of the base materials,
The temperature correction unit searches for and extracts emissivity information stored in the memory unit, and inputs emissivity information corresponding to the input base materials, and sets a welding temperature that is a reference value based on the extracted emissivity information. A welding temperature control system in which the base material emissivity of the laser welding machine is reflected, comprising a temperature setting program. The method of claim 1,
The laser output control unit is equipped with a control program for displaying an input unit for setting the welding temperature that is the reference of the base material to be welded,
The input unit comprises a first and second input windows for setting the maximum and minimum range of the welding temperature; A third input window for setting a minimum signal strength of the laser beam by the laser generator; A fourth input window for inputting emissivity information on the base material; And a fifth input window displaying a welding temperature correction value as a reference according to the emissivity information of the base material input to the fourth input window. Welding temperature control system that reflects the base material emissivity of the laser welding machine comprising a. The method of claim 3, wherein
Emissivity information for the base material is a welding temperature control system that reflects the base material emissivity of the laser welding machine, characterized in that the inherent emissivity information of the base material directly input by the operator. (a) setting a maximum and minimum temperature range of laser welding through an input unit displayed on the screen of the control terminal, and setting a welding temperature which is a reference for reflecting the inherent emissivity of the base metal to be welded;
(b) irradiating the laser beam generated through the laser generating unit to the base materials to be welded by the laser head after the welding temperature which is the reference of the step (a) is set;
(c) when the laser beam is irradiated to the base materials from the step (b), the infrared temperature sensor provided at the laser head measures the welding temperature according to the radiation of the laser beam emitted from the base materials;
(d) comparing the welding temperature of the base materials measured in real time from the step (c) with the welding temperature which becomes a reference set by reflecting the emissivity from the step (a);
(e) From the step (d), the laser output control unit 92 controls the laser output level of the laser generation unit when the welding temperature measured in real time is greater than the welding temperature which is the reference value of the emissivity, and the welding temperature measured in real time is the emissivity. Up-controlling the laser output level of the laser generation unit if the reflected welding temperature is equal to or smaller than the reflected reference; Welding temperature control method that reflects the base material emissivity of the laser welding machine characterized in that it proceeds, including. The method of claim 5,
In the step (a), the welding temperature setting as a reference may include: extracting emissivity information corresponding to the input base material in the memory unit when the type of base material to be welded is input and extracting the same into a temperature compensating unit; And,
The temperature compensation unit is a step of setting the welding temperature as a reference by reflecting the emissivity information of the base material extracted from the process; Welding temperature control method that reflects the base material emissivity of the laser welding machine further comprising a. The method of claim 5,
In the step (a), setting the welding temperature as a reference includes: inputting unique emissivity information of the base material to be welded through an input unit displayed on the screen of the control terminal; And,
Setting a welding temperature as a reference by reflecting the emissivity information of the base material according to the emissivity information input to the input unit; Welding temperature control method that reflects the base material emissivity of the laser welding machine characterized in that it proceeds, including.

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