KR102334747B1 - Laser welding method and laser welding system - Google Patents

Abstract

The present invention discloses a laser welding method and a laser welding system, the laser welding method comprising: obtaining a laser welding parameter input by a user, wherein the laser welding parameter includes a laser type parameter and a laser waveform parameter; the laser waveform parameter comprises a plurality of laser curve parameters, each laser curve parameter comprising a laser duration parameter, and a laser energy parameter at a start time and an end time of the duration; generating a laser waveform run list according to a plurality of the laser curve parameters; and sending the laser waveform execution list to the laser waveform design controller, and controlling the laser waveform design controller to generate a laser waveform matching the laser welding parameter, and then send it to the laser welding subsystem, so that the laser welding causing the subsystem to laser weld the element to be welded; includes Using the above technical solution, the laser waveform can be edited for different welding situations, so as to meet the high-precision welding requirements.

Description

Laser welding method and laser welding system

An embodiment of the present invention relates to the field of laser welding, and more particularly to a laser welding method and a laser welding system.

In recent years, lasers have been widely used in manufacturing, especially in fields such as welding, cutting and surface treatment. Since laser welding has high precision, high speed, and relatively small thermal deformation of a workpiece, laser welding technology is becoming more and more important in the field of welding.

In the case of pulse laser welding, a relatively common application is to conduct a simple welding experiment using a pulse laser directly, but in the case of equipment with special requirements for welding precision, such as a screen tensioning mechanism welding system, a single Since the length of the laser power light emission time and the size of the light emission power cannot be freely designed in the welding spot area, the welding object is easily melted or the welding is insufficient, so that it cannot meet the high-precision welding demand.

In view of this, an embodiment of the present invention provides a laser welding method and a laser welding system in order to solve technical problems that cannot meet the high-precision welding requirements in the prior art.

In a first aspect, an embodiment of the present invention provides a laser welding method applied to a laser welding system, wherein the laser welding system includes a laser energy controller, a laser waveform design controller and at least one set of laser welding subsystems, , the laser waveform design controller is connected to the laser energy controller and the laser welding subsystem, respectively;

The laser welding method comprises:

obtaining a laser welding parameter input by a user, wherein the laser welding parameter includes a laser type parameter and a laser waveform parameter, the laser waveform parameter includes a plurality of laser curve parameters, each of the laser curve parameters contains the laser duration parameter, and the laser energy parameters at the start and end of the duration;

generating a laser waveform run list according to a plurality of the laser curve parameters; and

transmit the laser waveform execution list to the laser waveform design controller, and control the laser waveform design controller to generate a laser waveform matching the laser welding parameter, and then transmit it to the laser welding subsystem, so that the laser welding sub-system causing the system to perform laser welding on the element to be welded; includes

Optionally, generating a laser waveform run list according to a plurality of the laser curve parameters comprises:

obtaining an intersection energy value and an intersection time value of any two adjacent laser curve intersection points in the laser waveform parameter;

calculating an energy difference value between two adjacent point energy values and a time difference value between two adjacent point point energy values; and

generating a laser waveform execution list according to the energy difference value and the time difference value; includes

Optionally, according to the energy difference value and the time difference value, generating a laser waveform execution list includes:

dividing the time difference value into a plurality of time segments according to a minimum resolution of the laser energy controller when both the energy difference value and the time difference value are non-zero;

generating a laser waveform execution list by storing different energy values corresponding to different time segments in the form of a function for each section; and

generating a laser waveform execution list by directly storing the intersection energy value and the intersection time value when the energy difference value or the time difference value is 0; includes

Optionally, the laser welding system includes a plurality of sets of laser welding subsystems, each set of the laser welding subsystems each includes one laser machine, the laser machine being connected with the laser energy controller;

Before acquiring the laser welding parameters input by the user, the laser welding method includes:

The method further includes performing energy normalization processing for the plurality of lasers.

Optionally, the laser type parameter comprises a continuous laser parameter and a pulsed laser parameter.

In a second aspect, an embodiment of the present invention provides a laser welding system for welding using the laser welding method according to the first aspect,

The laser welding system includes a laser energy controller, a laser waveform design controller, and at least one laser welding subsystem;

the laser energy controller acquires a laser welding parameter input by a user, and generates a laser waveform execution list according to the laser welding parameter; wherein the laser welding parameter includes a laser type parameter and a laser waveform parameter, the laser waveform parameter includes a plurality of laser curve parameters, each of the laser curve parameters includes a laser duration parameter, and a start time of duration and the laser energy parameters at the end time;

The laser waveform design controller is connected to the laser energy controller to receive the laser waveform execution list, and design a laser waveform according to the laser waveform execution list;

The laser welding subsystem is connected to the laser waveform design controller to perform laser welding on the element to be welded according to the laser waveform generated by the laser waveform design controller.

Optionally, the laser welding system includes a plurality of sets of laser welding subsystems, each set of the laser welding subsystems each includes one laser machine, the laser machine being connected with the laser energy controller;

The laser energy controller also performs energy normalization processing for a plurality of the lasers.

Optionally, each set of said laser welding subsystem comprises one laser machine, one welding head, one measuring device and one motion control device,

the welding head is located in the light emission path of the laser machine;

The measuring device is connected to the laser energy controller to determine a position of a welding point of the element to be welded and a position of a focal plane of the welding head, and transmits information about the position of the welding point and the position of the focal plane to the laser energy controller and;

The motion control device is connected to the laser energy controller to receive the welding point position information and the focal plane position information provided by the laser energy controller, and according to the welding point position information and the focal plane position information, the Control the welding head to move.

Optionally, each set of said laser welding subsystem further comprises one antioxidant device,

The oxidation prevention device is disposed on the welding head position side, and performs antioxidant protection for the welding point.

Optionally, each set of said laser welding subsystem further comprises one oscilloscope,

The oscilloscope is connected to the laser device and displays the waveform of the laser emitted by the laser device.

The laser welding method and laser welding system provided in the embodiment of the present invention obtains the laser welding parameters input by the user, generates a laser waveform execution list according to the laser curve parameters, and sets the laser waveform execution list to the laser waveform design controller and the laser waveform design controller generates a laser waveform corresponding to the laser welding parameters and controls the transmission to the laser welding subsystem, thereby controlling the laser welding subsystem to perform laser welding on the element to be welded. In the laser welding process, first, according to the laser welding parameters input by the user, the duration parameters of a plurality of laser curves, and the laser energy parameters of the start and end times of the duration are obtained, and the continuous waveform of the laser curve is discretized; , then, queuing the discretized parameters according to the time sequence, encapsulating the queue, and sending it to the laser waveform design controller, and the laser energy waveform is in the numerical value in the laser waveform execution list It can be changed according to the needs of high-precision welding, realizing editing of the laser waveform output from the laser welding subsystem.

Other features, objects and advantages of the present invention will become more apparent through the detailed description of the non-limiting examples made with reference to the following drawings.
1 is a flow schematic diagram of a laser welding method provided in an embodiment of the present invention.
2 is a structural schematic diagram of a laser welding system provided in an embodiment of the present invention.
3 is a structural schematic diagram of a laser waveform provided in an embodiment of the present invention.
4 is a schematic diagram of the principle of generating a laser waveform execution list provided in an embodiment of the present invention.
5 is a flow schematic diagram of another laser welding method provided in an embodiment of the present invention.
6 is a schematic diagram of a periodic continuous laser waveform provided in an embodiment of the present invention.
7 is a schematic diagram of an aperiodic continuous laser waveform provided in an embodiment of the present invention.
8 is a schematic diagram of a periodic laser square wave waveform provided in an embodiment of the present invention.
9 is a schematic diagram of an aperiodic laser square wave waveform provided in an embodiment of the present invention.
10 is a schematic diagram of a sinusoidal laser waveform provided in an embodiment of the present invention.
11 is a structural schematic diagram of another laser welding system provided in an embodiment of the present invention.
12 is a flow schematic diagram of another laser welding method provided in an embodiment of the present invention.
13 is a schematic diagram of another laser welding waveform provided in an embodiment of the present invention.
14 is a structural schematic diagram of another laser welding system provided in an embodiment of the present invention.
15 is a microscope effect diagram using the antioxidant provided in the embodiment of the present invention.
16 is a microscope effect diagram without the use of the antioxidant provided in the embodiment of the present invention.
17 to 21 are schematic diagrams of welding point-related characteristics obtained by measuring the welding point using a white light interferometer.

Hereinafter, the present invention will be described in more detail in conjunction with the accompanying drawings and embodiments. It can be understood that the specific examples described in the text are only for illustrating the present invention, and are not intended to limit the present invention. In addition, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not the entire contents.

An embodiment of the present invention provides a laser welding method used in a laser welding system, wherein the laser welding system includes a laser energy controller, a laser waveform design controller, and at least one set of laser welding subsystems, the laser waveform design controller comprising: connected to the laser energy controller and the laser welding subsystem, respectively; The laser welding method includes: obtaining a laser welding parameter input by a user, wherein the laser welding parameter includes a laser type parameter and a laser waveform parameter, and the laser waveform parameter includes a plurality of laser curve parameters, each laser the curve parameters include a laser duration parameter, and a laser energy parameter at the start and end of the duration; generating a laser waveform run list according to a plurality of laser curve parameters; and transmit the laser waveform execution list to the laser waveform design controller, and control the laser waveform design controller to generate a laser waveform matching the laser welding parameters, and then send it to the laser welding subsystem, so that the laser welding subsystem is the element to be welded to proceed with laser welding; includes Using the above technical method, in the laser welding process, first, according to the laser welding parameters input by the user, the duration parameters of a plurality of laser curves and the laser energy parameters of the starting and ending times of the duration are obtained, Discretize the continuous waveform of the curve, then queue the discretized parameters according to the sequence of time, encapsulate the queue, and send it to the laser waveform design controller, The energy waveform can be changed according to a numerical value in the laser waveform execution list, making the laser waveform output from the laser welding subsystem editable, to meet the high-precision welding requirement.

The above content is the core idea of the present invention, and in conjunction with the drawings in the embodiments of the present invention below, the technical solutions in the embodiments of the present invention will be clearly and completely described. Based on the embodiments in the present invention, all other embodiments obtained under the premise that ordinary technicians in the relevant field do not do creative work all fall within the protection scope of the present invention.

1 is a flow schematic diagram of a laser welding method provided in an embodiment of the present invention, FIG. 2 is a structural schematic diagram of a laser welding system provided in an embodiment of the present invention, and the laser welding method provided in an embodiment of the present invention is It can be applied to the laser welding system provided in the embodiment of the present invention, and as shown in FIG. 2, the laser welding system provided in the embodiment of the present invention is a laser energy controller 11, a laser waveform design controller 12 ) and at least one set of laser welding subsystem 13 , wherein the laser waveform design controller 12 is connected with the laser energy controller 11 and the laser welding subsystem 13 , respectively. As shown in Fig. 1, the laser welding method provided in the embodiment of the present invention includes the following steps:

Step S110, the laser welding parameters input by the user are acquired.

Illustratively, since the elements to be welded are different, the laser energy required for welding is also different, and in the laser welding process, the user rationally selects different laser types and laser waveforms according to the circumstances of the elements to be welded. Accordingly, the step of acquiring the laser welding parameters input by the user may specifically be the step of acquiring the laser type parameter and the laser waveform parameter input by the user.

Specifically, the laser type parameter may include a continuous laser parameter and a pulsed laser parameter, and when the element to be welded is relatively thin, welding may be performed using a continuous laser mode, where compared to the pulsed laser mode, the continuous laser mode power is Since it is relatively low and the energy is relatively small, it can be used to weld relatively thin elements to be welded; When the element to be welded is relatively thick, it can be welded using the pulsed laser mode, and the energy and measuring range of the pulsed laser waveform are large, but several times that of a continuous laser, which can be used to weld a relatively thick element to be welded. can

Additionally, the laser waveform parameter may include a plurality of laser curve parameters, each laser curve parameter including a laser duration parameter, and a laser energy parameter at a start time and an end time of the duration.

Illustratively, FIG. 3 is a structural schematic diagram of a laser waveform provided in an embodiment of the present invention, and as shown in FIG. 3 , the laser waveform 20 is a plurality of laser curves 21, 22, 23, 24, 25 , 26, 27 and 28), wherein the laser curve 21 includes a duration T1, and laser energy parameters P0, P1 at the start and end of the duration; Likewise, the laser curve 22 includes a duration T2 and laser energy parameters P1 and P2 at the start and end of the duration; ....; The laser curve 28 includes a duration T8 and laser energy parameters P1 and P0 at the start and end of the duration.

Step S120, a laser waveform execution list is generated according to a plurality of the laser curve parameters.

Illustratively, a laser waveform execution list is generated according to a laser curve parameter included in the laser welding parameter input by the user, but the laser waveform execution list may be understood to include a plurality of viewpoint-energy correspondence data, and a plurality of viewpoints -Energy-corresponding data forms a laser waveform execution list in the order of time.

Illustratively, FIG. 4 is a schematic diagram of a principle of generating a laser waveform execution list provided in an embodiment of the present invention, and FIG. 4 will be described using only one segment of a laser curve in the laser waveform shown in FIG. 3 as an example. Then, as shown in Fig. 4, according to the time sequence, a plurality of points (M1, M2, .....) are selected from each segment function, and a time value and an energy value corresponding to each point are obtained. In this way, a viewpoint-energy lattice is obtained, and the viewpoint-energy lattice is encapsulated according to the chronological order to form a laser waveform execution list.

Step S130, sending the laser waveform execution list to the laser waveform design controller, and controlling the laser waveform design controller to generate a laser waveform matching the laser welding parameters, and then transmit it to the laser welding subsystem , causing the laser welding subsystem to laser weld the element to be welded.

Illustratively, the laser waveform execution list is sent to the laser waveform design controller, and the laser waveform design controller generates a laser waveform matching the laser welding parameter input by the user according to the laser waveform execution list, and laser welding the laser waveform Only when transmitted to the subsystem, the laser welding subsystem emits a laser according to the laser waveform, so that the laser welding of the element to be welded can be performed.

To summarize the above description, the laser welding method provided in the embodiment of the present invention is, first, according to the laser welding parameters input by the user, the duration parameters of a plurality of laser curves, and the laser at the start and end times of the duration. Acquire the energy parameter, discretize the continuous waveform of the laser curve, then queue the discretized parameter in the sequence of time, encapsulate the queue, and send it to the laser waveform design controller, the laser energy waveform is the laser waveform It can be changed according to the numerical value in the action list, realizing the editing of the laser waveform output from the laser welding subsystem, to meet the high-precision welding demand.

5 is a flow schematic diagram of another laser welding method provided in the embodiment of the present invention, and as shown in FIG. 5 , the laser welding method provided in the embodiment of the present invention includes the following steps:

Step S210, the laser welding parameters input by the user are obtained.

In step S220, an intersection energy value and an intersection time value of any two adjacent laser curve intersection points are obtained from the laser waveform parameters.

In step S230, a difference value between energy values of two adjacent intersection points and a time difference value between two adjacent intersection point time values are calculated.

In step S240, a laser waveform execution list is generated according to the energy difference value and the time difference value.

Optionally, if both the energy difference value and the time difference value are non-zero, divide the time difference value into a plurality of time segments according to a minimum resolution of the laser waveform design controller;

storing different energy values corresponding to different time segments in the form of a piece-wise function to generate a laser waveform execution list;

When the energy difference value or the time difference value is 0, the intersection energy value and the intersection time value are directly stored to generate a laser waveform execution list.

In step S250, the laser waveform execution list is transmitted to the laser waveform design controller, and the laser waveform design controller generates a laser waveform matching the laser welding parameters, and then controls it to be transmitted to the laser welding subsystem , causing the laser welding subsystem to laser weld the element to be welded.

Illustratively, according to the laser welding parameters input by the user, the laser curve can be abstracted as a section-by-section function, and the section-by-section function is described as two typical function types below:

와 같이 기록할 수 있고, 이후 각 세그먼트 함수를 시간 순서에 따라 n으로 표기하되, n=0, 1, 2◎이다. 레이저 곡선이 직선인 경우, 기울기(k)에 따라 레이저 곡선에 대해 큐잉 처리를 진행한다. 에너지 차이값 또는 시간 차이값이 0(즉 k=0 또는 존재하지 않음)인 경우, 이때의 레이저 곡선은 수평방향에서 변하지 않거나 수직 상승하므로, 교점 에너지값 및 교점 시간값을 직접 저장하여, 레이저 파형 실행 리스트를 생성하고; 상기 에너지 차이값 및 상기 시간 차이값이 모두 0이 아닌(즉 0<k<∞ 경우, 레이저 에너지 제어기의 최소 해상도에 따라, 시간 차이값을 다수의 시간 세그먼트로 분할하고, 상이한 시간 세그먼트에 대응되는 상이한 에너지값을 구간별 함수의 형식으로 저장하여, 레이저 파형 실행 리스트를 생성한다. 레이저 곡선이 직선이 아닌 경우, 마찬가지로 레이저 에너지 제어기의 최소 해상도에 따라, 시간 차이값을 다수의 시간 세그먼트로 분할하고, 상이한 시간 세그먼트에 대응되는 상이한 에너지값을 구간별 함수의 형식으로 저장하여, 레이저 파형 실행 리스트를 생성한다. When a user adjusts laser welding parameters according to the condition of the element to be welded, the above two functions are frequently used. Within different independent variable ranges, the intersection energy value and intersection time value between the function and the function

It can be written as , and then, each segment function is denoted by n according to the time sequence, but n=0, 1, 2◎. When the laser curve is a straight line, the queuing process is performed on the laser curve according to the slope (k). When the energy difference value or the time difference value is 0 (that is, k=0 or does not exist), the laser curve at this time does not change in the horizontal direction or rises vertically, so the intersection energy value and the intersection time value are directly stored, and the laser waveform create an action list; When both the energy difference value and the time difference value are non-zero (that is, when 0<k<∞, the time difference value is divided into a plurality of time segments according to the minimum resolution of the laser energy controller, and corresponding to different time segments By storing the different energy values in the form of a section-by-section function, the laser waveform run list is generated.If the laser curve is not a straight line, the time difference value is also divided into multiple time segments according to the minimum resolution of the laser energy controller; , by storing different energy values corresponding to different time segments in the form of a function for each section, a laser waveform execution list is generated.

It should be explained that, according to the minimum resolution of the laser energy controller, dividing the time difference value into a plurality of time segments may be dividing or unequalizing the time difference value into a plurality of time segments, an embodiment of the present invention is not limited thereto; In addition, each time segment may have the minimum resolution or an integer multiple of the minimum resolution according to the precision requirement, but the embodiment of the present invention is not limited thereto.

What should be further explained is that, in the process of abstracting the laser curve as a function for each section, considering the actual situation, segmentation can be performed using a more complex function. do not explain

In this method, by designing the software code in the laser energy controller, the design for an arbitrary waveform can be implemented, and it includes the following functions:

Open list Open_list(), the function creates an energy control container, stores the laser welding parameters entered by the user, and enters the relevant parameters for laser welding immediately after opening for convenient next use. have.

Energy setting write_data(), the corresponding function mainly controls the laser welding energy, and the user can input the energy at any point in time to control the laser light emission energy.

Time setting write_times(), the function controls the laser light emission time.

Close_list() to close the list After the reception of the laser welding parameters entered by the user is completed, the laser welding parameters cannot be re-entered into the laser energy controller unless the list is opened again.

List execution Execute_list(), after abstracting the laser curve into a section-by-section function and setting the section-by-section function, the laser energy controller controls the laser waveform design controller to process the data in list(), and the laser waveform design controller After generating a laser waveform matching the laser welding parameters, the control is transmitted to the laser welding subsystem, so that the laser welding subsystem proceeds with laser welding on the element to be welded.

In practice, by calculating the minimum resolution of the laser energy controller, different energies are differentiated to realize a continuous increase in energy. In the whole process, the laser waveform design controller integrates the control parameters received from the laser energy controller, forms a laser waveform that matches the laser welding parameters, forms a laser energy curve required by the user, and welds, so that the high precision required to achieve the process effect.

Optionally, the laser type parameter includes a continuous laser parameter and a pulsed laser parameter, and since the welding thicknesses of different elements to be welded are different, welding must be performed using different powers. In the welding process, different laser welding waveforms have different welding effects, specifically as follows:

1. In continuous laser mode, the waveform design specifically includes the following welding situations:

a) Periodic continuous laser waveform

As shown in Fig. 6, the laser wave energy can be designed as shown in the figure, where the period of the laser energy wave is T=T1+T2+T3+...+Tn. Since the waveform energy of different points can be changed, control of the laser waveform within a single point can be implemented. In fact, in the process of designing the laser wave energy, the cycle can be designed according to the actual process demand, and both the wave shape and the number of segments can be freely designed. In addition, according to the needs of the actual process, different laser waveforms are designed and edited to realize a relatively desirable welding effect. For some welding objects, when the single waveform welding effect is not perfect, the welding may be repeated n times to form a periodic welding waveform, the characteristics of which are as follows:

Ti=T, Ti1=Tj1, Ti2=Tj2,..., Tin=Tjn (i, j, n=0, 1, 2....)

b) aperiodic continuous laser waveform

As shown in Fig. 7, each laser energy waveform is all different and can be freely designed, and its features are as follows:

Ti≠T, Ti1≠Tj1, Ti2≠Tj2,..., Tin=Tjn (i, j, n=0, 1, 2....)

c) Periodic laser square wave waveform

As shown in Fig. 8, the period and duty ratio can also be freely designed, so as to implement welding with a periodic square wave for different elements to be welded, where each square wave period is the same and the duty ratio is the same, Features are as follows:

Ti=T, Ti1=Tj1, Ti2=Tj2,...(i, j=0, 1, 2....)

d) aperiodic laser square wave waveform

As shown in FIG. 9 , the period and duty ratio can also be freely designed, so that welding is performed with aperiodic square waves for different elements to be welded, where the cycles of each square wave do not all match and the duty ratio is the same It does not, and its features are as follows:

Ti≠T, Ti1≠Tj1, Ti2≠Tj2,...(i, j=0, 1, 2....)

e) sinusoidal laser waveform

As shown in FIG. 10 , all waveforms similar to y=Asin(wt+p)+B may be edited and designed.

2. In pulse laser mode, the waveform design specifically includes the following welding situations.

In pulsed laser welding mode and continuous laser welding mode, the biggest difference of laser energy waveform is:

1. The energy measurement range is different, the pulse waveform has a large energy and measurement range, but several times that of a continuous laser; and

2. The pulse laser energy waveform must be manually input to the laser energy controller in advance, and then is triggered to automatically perform welding; There are two.

In the pulsed laser mode, the design of the different waveforms is consistent with that of the continuous laser, so it will not be repeated here any further.

Regardless of whether it is a continuous laser or a pulsed laser, in the entire waveform design process, the laser welding parameters input by the user are first received, and multiple laser curves are extracted from the laser welding parameters, and then the continuous waveforms of the laser curves are discretized. to obtain the time-energy point value of , then, according to the time sequence, queuing and encapsulating a plurality of discretized time-energy point values to obtain a laser waveform encapsulation list, and finally passing it to the laser waveform design controller collectively; , control the laser waveform design controller to generate a laser waveform matching the laser welding parameters and use it to proceed welding on the element to be welded, so as to ensure the adjustment of the laser waveform of laser welding, and meet the high-precision welding requirements; In addition, by adjusting the laser type, it is ensured that different laser welding modes can be used effectively for different to-be-welded elements, so that the welding effect is excellent.

11 is a structural schematic diagram of another laser welding system provided in an embodiment of the present invention, and FIG. 12 is a flow schematic diagram of another laser welding method provided in an embodiment of the present invention, as shown in FIG. 11 , the present invention The laser welding system provided in the embodiment of may include multiple sets of laser welding subsystems 13 , each set of laser welding subsystems 13 including one laser machine 131 , Here, the laser device 131 is connected to the laser energy controller 11; 12 , the laser welding method provided in the embodiment of the present invention may include the following steps:

In step S310, an energy normalization process is performed for the plurality of laser devices.

Step S320, the laser welding parameters input by the user are acquired.

The step of acquiring the laser welding parameter input by the user may specifically be the step of acquiring the laser type parameter and the laser waveform parameter input by the user. Specifically, the laser type parameter may include a continuous laser parameter and a pulsed laser parameter, and the laser waveform parameter may include a plurality of laser curve parameters, wherein each laser curve parameter includes a laser duration parameter, and a duration of Include the laser energy parameters at the start and end points.

In step S330, a laser waveform execution list is generated according to a plurality of the laser curve parameters.

Step (S340), sending the laser waveform execution list to the laser waveform design controller, and controlling the laser waveform design controller to generate a laser waveform matching the laser welding parameters, and then send it to the laser welding subsystem , causing the laser welding subsystem to laser weld the element to be welded.

Summarizing the above, by using a plurality of laser welding subsystems to perform welding on the element to be welded, it is possible to adjust all the lasers emitted by each laser welding subsystem, and to meet the high-precision and high-efficiency requirements. can satisfy; In addition, before receiving the laser welding parameters input by the user, normalization processing is performed for the energies of a plurality of laser devices to ensure that the initial energies of the laser devices match at the start of welding, so that the welding effect is excellent.

It should be explained, that the embodiment of the present invention is described by taking as an example that energy normalization processing is performed for a plurality of laser devices before receiving the laser welding parameters input by the user, and it can be understood that the laser If a plurality of laser machines are normalized before emitting, the laser machine can secure the coincidence of initial energy during welding, thereby ensuring the welding effect.

In general, in the actual welding operation process, when welding an element to be welded that requires high precision, a relatively large stress is generated due to a sudden change in energy to prevent an effect on the welding effect, the welding start and the welding end process In , it is possible to appropriately proceed with a gradient change rather than a sudden change of power, but a waveform editing must be performed, and a detailed waveform is as shown in FIG. 13 . By setting the electric power gradient change at the start and end of welding, the change in electric power is slowed, so that, during the start and end of welding, relatively large stress does not occur in the element to be welded, and excellent welding effect is ensured.

Based on the same inventive concept, an embodiment of the present invention further provides a laser welding system using the laser welding method provided in the embodiment of the present invention, as shown in FIG. 14 , in the embodiment of the present invention The provided laser welding system may include a laser energy controller (11), a laser waveform design controller (12) and at least one set of laser welding subsystems (13);

The laser energy controller 11 acquires the laser welding parameters input by the user, and generates a laser waveform execution list according to the laser welding parameters; The laser welding parameter includes a laser type parameter and a laser waveform parameter, the laser waveform parameter includes a plurality of laser curve parameters, each laser curve parameter includes a laser duration parameter, and a laser at a start time and an end time of the duration. energy parameters;

The laser waveform design controller 12 is connected to the laser energy controller 11 to receive a laser waveform execution list, and design a laser waveform according to the laser waveform execution list;

The laser welding subsystem 13 is connected to the laser waveform design controller 12 to perform laser welding on the element to be welded according to the laser waveform generated by the laser waveform design controller 12 .

Specifically, by arranging a control-card or galvanometer control device in the laser energy controller 11 to generate laser welding parameters as a laser waveform execution list, or by arranging other elements to set the laser welding parameters. A function of generating a laser waveform execution list may be implemented, but the embodiment of the present invention is not limited thereto.

In summary, the laser welding apparatus and the laser energy controller provided in the embodiment of the present invention are used in combination with the laser waveform design controller, and the laser energy controller generates a plurality of laser curves according to the laser welding parameters input by the user. Acquire the duration parameter, and the laser energy parameters of the start and end times of the duration, discretize the continuous waveform, then queue the discretized parameters in time sequence, encapsulate the queue, and then the laser waveform design controller and the laser energy waveform generates a laser waveform matching the laser welding parameters according to the numerical value in the laser waveform execution list, and the laser welding subsystem outputs an editable laser waveform to perform welding on the element to be welded Thus, high-precision welding requirements are met.

Optionally, still referring to FIG. 14 , the laser welding system provided in the embodiment of the present invention includes a plurality of sets of laser welding subsystems 13 , each set of laser welding subsystems 13 including one laser a group 131, the laser device 131 being connected to the laser energy controller 11 (not shown in the figure); The laser energy controller 11 is also used to perform energy normalization processing for a plurality of laser devices 131, for example, the laser energy controller 11 is configured to perform the energy normalization process for each laser device through a built-in powermeter (powermeter). 131), and if the initial power does not match, energy normalization processing is performed for a plurality of laser devices 131 to ensure that the laser initial energy matches at the start of welding, thereby securing excellent welding effect do.

Optionally, still referring to FIG. 14 , the laser welding subsystem 13 provided in the embodiment of the present invention includes a laser machine 131 , a welding head 132 , a measurement device 133 , and a motion control device 134 . may include The welding head 132 is positioned in the light emission path of the laser machine 131, receives the laser emitted by the laser machine 131, and performs laser welding on the element to be welded; The measuring device 133 is connected to the laser energy controller 11 (not shown in the drawing) to determine a position of a welding point of an element to be welded and a position of a focal plane of the welding head 132, the welding point transmit the position information and the focal plane position information to the laser energy controller 11; The motion control device 134 is connected to the laser energy controller 11, receives the welding point position information and the focal plane position information provided by the laser energy controller 11, and according to the welding point position information and the focal plane position information Controls the movement of the welding head 132 .

Specifically, the laser machine 131 is provided with a laser machine (CW mode and QCW mode) capable of realizing a continuous laser mode and a pulsed laser mode.

The welding head 132 is compatible with optical fiber splice, QBH and QD.

The motion control device 134 may be a three-dimensional motion stage, it has x-axis, y-axis, and z-axis 3-axis motion, and can drive the motion of the welding head 132 , through the three-dimensional motion, the entire observation field of view of welding can be implemented.

Optionally, still referring to FIG. 14 , the laser welding subsystem 13 provided in the embodiment of the present invention may further include an antioxidant device 135 , wherein the antioxidant device 135 includes the welding head 132 . ) is disposed on the position side, and antioxidation protection is carried out for the welding point.

Specifically, an inert gas such as N2 may be generally disposed in the antioxidant device 135, and after the laser waveform design controller 12 completes the laser waveform design and before laser welding, the antioxidant device ( 135) is turned on, oxidation protection is performed on the welding point through the oxidation prevention device 135, and the oxidation prevention device 135 is turned off after laser welding is completed. 15 is a microscopic effect diagram using the antioxidant provided in the embodiment of the present invention, FIG. 16 is a microscope effect diagram without the antioxidant provided in the embodiment of the present invention, and FIGS. 15 and 16 As can be seen by comparison, when the oxidation protection device 135 is used to protect the welding points from oxidation, the welding effect is excellent.

Optionally, still referring to FIG. 14 , the laser welding subsystem 13 provided in the embodiment of the present invention may further include an oscilloscope 136 , wherein the oscilloscope 136 includes a laser device 131 . ) and displays the waveform of the laser emitted by the laser device 131, the user monitors the energy waveform of the laser actually output by the laser device 131 through the oscilloscope 136, the laser device 131 is Ensure that the output laser energy waveform meets user needs.

Optionally, the laser welding subsystem provided in the embodiment of the present invention may further include a galvanometer (not shown in the drawing) for controlling the light emission of the laser device 131 .

17 to 21 are schematic diagrams of welding point-related characteristics obtained by measuring the welding point using a white light interferometer, and as shown in FIGS. 15 to 19 , a laser welding system and a laser welding method provided in an embodiment of the present invention The welding effect is good, no stress is generated, and the high-precision welding needs are met.

It should be noted that the foregoing is merely a relatively preferred embodiment of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that those skilled in the art can make various obvious changes, readjustments, interconnections and substitutions without departing from the scope of the present invention. will be. Accordingly, although the present invention has been described in relatively detail through the above embodiments, the present invention is not limited to the above embodiments, and may further include many other equivalent embodiments without departing from the scope of the present invention. and the scope of the present invention is determined by the appended claims.

Claims (10)

In the laser welding method applied to the laser welding system,
the laser welding system includes a laser energy controller, a laser waveform design controller and at least one set of laser welding subsystems, the laser waveform design controller is connected to the laser energy controller and the laser welding subsystem respectively;
The laser welding method comprises:
obtaining a laser welding parameter input by a user, wherein the laser welding parameter includes a laser type parameter and a laser waveform parameter, the laser waveform parameter includes a plurality of laser curve parameters, each of the laser curve parameters contains the laser duration parameter, and the laser energy parameters at the start and end of the duration;
generating a laser waveform run list according to a plurality of the laser curve parameters; and
transmit the laser waveform execution list to the laser waveform design controller, and control the laser waveform design controller to generate a laser waveform matching the laser welding parameter, and then transmit it to the laser welding subsystem, so that the laser welding sub-system causing the system to perform laser welding on the element to be welded; including,
Generating a laser waveform run list according to a plurality of the laser curve parameters comprises:
obtaining an intersection energy value and an intersection time value of any two adjacent laser curve intersection points in the laser waveform parameter;
calculating an energy difference value between two adjacent point energy values and a time difference value between two adjacent point point energy values; and
generating a laser waveform execution list according to the energy difference value and the time difference value; includes,
According to the energy difference value and the time difference value, generating a laser waveform execution list includes:
dividing the time difference value into a plurality of time segments according to the minimum resolution of the laser energy controller when both the energy difference value and the time difference value are non-zero;
generating a laser waveform execution list by storing different energy values corresponding to different time segments in the form of a function for each section; and
generating a laser waveform execution list by directly storing the intersection energy value and the intersection time value when the energy difference value or the time difference value is 0; A laser welding method comprising a. The method of claim 1,
the laser welding system includes a plurality of sets of laser welding subsystems, each set of the laser welding subsystems each including one laser machine, the laser machine being connected with the laser energy controller;
Before acquiring the laser welding parameters input by the user, the laser welding method includes:
Laser welding method, characterized in that it further comprises the step of performing an energy normalization process for the plurality of laser machines. The method of claim 1,
The laser welding method according to claim 1, wherein the laser type parameter includes a continuous laser parameter and a pulsed laser parameter. In the laser welding system for welding using the laser welding method according to any one of claims 1 to 3,
wherein the laser welding system comprises a laser energy controller, a laser waveform design controller and at least one laser welding subsystem;
the laser energy controller acquires a laser welding parameter input by a user, and generates a laser waveform execution list according to the laser welding parameter; wherein the laser welding parameter includes a laser type parameter and a laser waveform parameter, the laser waveform parameter includes a plurality of laser curve parameters, each of the laser curve parameters includes a laser duration parameter, and a start time of duration and the laser energy parameters at the end time;
the laser waveform design controller is connected to the laser energy controller to receive the laser waveform execution list, and design a laser waveform according to the laser waveform execution list;
and the laser welding subsystem is connected to the laser waveform design controller to perform laser welding on the element to be welded according to the laser waveform generated by the laser waveform design controller. 5. The method of claim 4,
the laser welding system includes a plurality of sets of laser welding subsystems, each set of the laser welding subsystems each including one laser machine, the laser machine being connected with the laser energy controller;
The laser energy controller also performs energy normalization processing for the plurality of lasers. 5. The method of claim 4,
Each set of the laser welding subsystems comprises one laser machine, one welding head, one measuring device and one motion control device,
the welding head is located in the light emission path of the laser machine;
The measuring device is connected to the laser energy controller to determine a position of a welding point of the element to be welded and a position of a focal plane of the welding head, and transmits information about the position of the welding point and the position of the focal plane to the laser energy controller and;
The motion control device is connected to the laser energy controller to receive the welding point position information and the focal plane position information provided by the laser energy controller, and according to the welding point position information and the focal plane position information, the A laser welding system, characterized in that the welding head is controlled to move. 7. The method of claim 6,
each set of said laser welding subsystems further comprising one antioxidant;
The oxidation prevention device is disposed on the welding head position side, the laser welding system, characterized in that the oxidation protection proceeds to the welding point. 7. The method of claim 6,
each set of said laser welding subsystems further comprising one oscilloscope;
The oscilloscope is connected to the laser device, the laser welding system, characterized in that for displaying the waveform of the laser emitted by the laser device. delete delete

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