A preheating method for a laser welding machine

Abstract

This invention relates to a preheating method for a laser welding machine, comprising the following steps: Step 1: Establishing a laser welding machine preheating management platform, s1: Collecting the required preheating time for different welding materials, storing the time in a database, and establishing a data exchange platform where users can upload data on the optimal preheating time and temperature at any time; s2: Building a data network where different users share data. During the preheating process, the system automatically matches the optimal preheating time and temperature by inputting the name of the corresponding welding material. This laser welding machine preheating method uses data interconnection to store welding preheating methods, verifies the collected data to derive the optimal preheating time and temperature scheme, and can automatically allocate the optimal scheme according to the needs of different users, eliminating the need for users to practice, reducing the difficulty of the welding preheating process, and allowing ordinary employees to quickly complete the preheating work before welding according to the equipment instructions.

Description

Technical Field

[0001] This invention relates to the field of laser welding machine technology, specifically to a preheating method for a laser welding machine. Background Technology

[0002] Laser welding is a highly efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important applications of laser material processing technology. Laser welding can be achieved using continuous or pulsed laser beams. The principle of laser welding can be divided into heat conduction welding and laser deep penetration welding.

[0003] Preheating before welding is a process of appropriately heating the workpiece, both locally and as a whole, before welding. Its purpose is to reduce the cooling rate of the weld joint, avoid the formation of hardened structures, and reduce welding stress and deformation. It is an effective method to prevent welding cracks. However, traditional laser welding machine preheating methods have poor temperature control and only preheat for a specified time. This results in different welding materials not meeting the preheating requirements even when preheated for the same time. The preheating effect is poor, the system lacks intelligence, and it requires personnel with a thorough understanding of various welding materials to implement, making it difficult to promote. Therefore, a preheating method for laser welding machines is proposed to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a preheating method for laser welding machines. This method features intelligent interconnection and the ability to achieve optimal welding preheating based on different welding materials. It solves the problems of traditional laser welding machine preheating methods, which suffer from poor temperature control, only preheating for a specified time, resulting in different welding materials failing to meet preheating requirements even with the same preheating time, poor preheating effect, poor intelligence, and the need for personnel with thorough knowledge of various welding materials to implement the method, making it difficult to promote.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a preheating method for a laser welding machine, comprising the following preheating methods:

[0006] Step 1: Establish a laser welding machine preheating management platform

[0007] s1: Collect the preheating time required for different welding materials, record the time in the database, and establish a data exchange platform so that users can upload the optimal preheating time and temperature data at any time;

[0008] s2: Establish a data network so that different users can share data through the data network. During the preheating process, enter the name of the corresponding welding material and the system will automatically match the optimal preheating time and temperature.

[0009] S3: Establish a backend data verification laboratory to determine the corresponding temperature and time for user-uploaded data, find the best solution, select the best option for different data of the same material, and upload the best experimental data to the database for subsequent uploads of different data of the same material, and continuously update and maintain the backend database.

[0010] Step 2: Preheat by category

[0011] S1: Preheating methods are divided into: solder delivery pipe preheating and soldering area preheating;

[0012] s2: Solder delivery tube preheating: The solder delivery tube is preheated using heating methods such as oxy-acetylene torch heating, resistance heating, and induction heating;

[0013] S3: Preheating of the welding area: Heating the welding area and surrounding metal to 40 to 150 degrees Celsius. This temperature is affected by the welding material. This process will automatically upload the data to the remote network terminal.

[0014] Furthermore, the laser welding machine preheating management platform includes a user terminal, a database, and a backend maintenance terminal. The user terminal provides users with the optimal welding preheating method and collects user data into the database. The database records the optimal welding time and temperature for different welding materials and updates it in real time. The backend maintenance terminal will conduct experimental verification of the uploaded data and continuously improve the database content by uploading time data.

[0015] Furthermore, when establishing the database in step one, it is necessary to first build a user front-end. Users input the preheating material on the front-end operation interface, and the system will assign the user the optimal heating temperature and preheating time. At the same time, users can also add custom preheating materials to update the database.

[0016] Furthermore, the user interface will be intelligently controlled with the preheating equipment via power supply, using a microcontroller to control the opening and closing of the circuit. The user terminal will collect the user's preheating time, and the user can also report the welding quality to the terminal. Through continuous data accumulation, the optimal welding time and temperature for the corresponding material can be achieved.

[0017] Furthermore, after establishing the data network in step one, the user terminal will be divided into offline mode and online mode. In offline mode, the user chooses not to connect to the network, and the user terminal will use existing data to recommend preheating time and temperature for the welding material input by the user. The user can adjust it according to their own experience.

[0018] Furthermore, in the online mode, the user's time will be updated, the optimal welding preheating time and temperature will be transmitted to the user and stored, and customer-defined data will be uploaded. The uploaded data will be used to update the database after being verified by experiments.

[0019] Furthermore, during the preheating of the solder delivery tube, the temperature of resistance heating and induction heating is easier to control than that of soldering torch heating, and the preheating method needs to be changed according to the actual situation.

[0020] Furthermore, the preheating area during the welding interval preheating process is a 30mm radius area centered on the welding center point. During the preheating process, the temperature of the heating area is monitored in real time by a temperature sensor.

[0021] Furthermore, during the categorized welding process, the laser welding head also needs to be cooled to ensure that the preheating of the solder delivery pipeline and the welding area does not heat the laser welding head.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] 1. The preheating method of this laser welding machine uses data interconnection to store the welding preheating method. After verifying the collected data, the optimal preheating time and temperature scheme is obtained. The welding preheating is connected to the network, and the optimal scheme can be automatically allocated according to the needs of different users. Users do not need to practice it themselves, which reduces the difficulty of the welding preheating process and allows ordinary employees to quickly complete the preheating work before welding according to the instructions of the equipment.

[0024] 2. The preheating method of this laser welding machine, by adopting the optimal preheating time and temperature, is an effective measure to prevent cold cracks, hot cracks, and the formation of hardened structures in the heat-affected zone. When welding in a highly constrained weld joint area, rapid cooling and heating can generate shrinkage stress in the joint area, leading to cracks. Preheating the joint area before welding can reduce shrinkage stress and prevent crack formation. When welding in low-temperature areas, even low-carbon steel with a thickness exceeding 20 mm must undergo preheating treatment to prevent crack formation. Preheating can also remove oil, moisture, and other factors that affect weld quality, and promote the escape of hydrogen from the weld, thus playing a corresponding role in preventing defects such as porosity and crack formation.

[0025] 3. The preheating method of this laser welding machine involves preheating the solder delivery pipe. This preheating ensures that the heat during welding is input into the weld rather than released into the surrounding metal, thus preventing welding defects. By preheating the welding area, the temperature difference between the weld and the surrounding metal is reduced, thereby reducing the thermal stress of the weld metal and decreasing the tendency for welding cracks and deformation. In addition, preheating also helps to remove gases, especially hydrogen gas that overflows from the weld. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] A preheating method for a laser welding machine in this embodiment includes the following preheating method:

[0029] Establish a laser welding machine preheating management platform

[0030] s1: Collect the preheating time required for different welding materials, record the time in the database, and establish a data exchange platform so that users can upload the optimal preheating time and temperature data at any time;

[0031] s2: Establish a data network so that different users can share data through the data network. During the preheating process, enter the name of the corresponding welding material and the system will automatically match the optimal preheating time and temperature.

[0032] S3: Establish a backend data verification laboratory to determine the corresponding temperature and time for user-uploaded data, find the best solution, select the best option for different data of the same material, and upload the best experimental data to the database for subsequent uploads of different data of the same material, continuously updating and maintaining the backend database.

[0033] In this embodiment, the welding preheating method is stored using data interconnection. After verifying the collected data, the optimal preheating time and temperature scheme is obtained. The welding preheating is connected to the network, and the optimal scheme can be automatically allocated according to the needs of different users. Users do not need to practice it themselves, which reduces the difficulty of the welding preheating process and allows ordinary employees to quickly complete the preheating work before welding according to the instructions of the equipment.

[0034] It should be noted that interconnected data refers to the full, two-way communication data carried by the fiber optic network connecting the client and the server. It is a processed, high-value, business-usable data source and the most comprehensive and objective reference data resource for understanding the system's business operation status in real time and intuitively. By reorganizing the massive data transmitted in the network into structured data in real time, it helps operation and maintenance personnel to create behavioral baselines, detect abnormal behaviors, and perform real-time performance fault location and troubleshooting. It is the most comprehensive and high-value data resource for intuitively understanding the business operation status.

[0035] Example 2

[0036] A preheating method for a laser welding machine in this embodiment includes the following preheating method:

[0037] Preheating is carried out by category.

[0038] S1: Preheating methods are divided into: solder delivery pipe preheating and soldering area preheating;

[0039] s2: Solder delivery tube preheating: The solder delivery tube is preheated using heating methods such as oxy-acetylene torch heating, resistance heating, and induction heating;

[0040] S3: Preheating of the welding area: Heating the welding area and surrounding metal to 40 to 150 degrees Celsius. This temperature is affected by the welding material. This process will automatically upload the data to the remote network terminal.

[0041] In this embodiment, preheating the solder delivery pipe ensures that the heat during welding is input into the weld rather than released into the surrounding metal, thus preventing welding defects. Preheating the welding area reduces the temperature difference between the weld and the surrounding metal, thereby reducing the thermal stress of the weld metal and decreasing the tendency for welding cracks and deformation. In addition, preheating helps to remove gases, especially hydrogen gas that overflows from the weld.

[0042] In this embodiment, the preheating of the solder delivery tube before soldering can be achieved by methods such as oxy-acetylene torch heating, resistance heating, and induction heating. Among these methods, the temperature of resistance heating and induction heating is easier to control than that of torch heating. The purpose of preheating the solder delivery tube is to ensure that the heat during welding is input into the weld rather than discharged into the surrounding metal, so as to avoid welding defects.

[0043] In this embodiment, preheating the welding area and surrounding metal to 40 to 150 degrees Celsius can effectively prevent welding heat from being released into the surrounding metal. Since preheating reduces the temperature difference between the weld and the surrounding metal, the thermal stress of the weld metal is also reduced accordingly, thus reducing the tendency for welding cracks and deformation. In addition, preheating also helps to remove gases, especially hydrogen gas that overflows from the weld. In the welding process specification, the required preheating temperature is specified according to the welding method, welding rod, and solder delivery tube material used. The preheating temperature can be measured using a high-temperature thermometer, a portable pyrometer, or a thermocouple.

[0044] By adopting the above technical solutions, preheating is an effective measure to prevent cold cracks, hot cracks, and hardened structures in the heat-affected zone. When welding high-carbon steel, low-alloy steel, heat-resistant steel, and ordinary low-carbon steel components with high rigidity, the rapid cooling rate of the weld makes it easy for hardened structures to form in the weld and heat-affected zone, leading to cracks. Therefore, preheating is necessary for the weldment. Preheating slows down the cooling rate and prevents cracks from forming in the weld. When welding large-constraint joint areas, rapid cooling and heating can generate shrinkage stress in the joint area, causing cracks. Preheating the joint area before welding can reduce shrinkage stress and prevent cracks. When welding in low-temperature areas, even low-carbon steel with a thickness exceeding 20 mm must be preheated to prevent cracks. Preheating also removes oil, moisture, and other factors that affect weld quality, and promotes the escape of hydrogen from the weld, thus preventing defects such as porosity and cracks.

[0045] In summary, storing welding preheating methods through data interconnection allows for the automatic allocation of optimal solutions based on different user needs, reducing the complexity of the welding preheating process. This enables ordinary employees to quickly complete preheating work according to equipment instructions. Preheating the solder delivery pipe ensures that heat is input into the weld rather than released into the surrounding metal, preventing welding defects. This solves the problems of traditional laser welding machine preheating methods, such as poor temperature control, adherence to preheating times, inadequate preheating for different welding materials, poor preheating effect, low intelligence, and the need for personnel with thorough knowledge of various welding materials, hindering widespread adoption.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A preheating method for a laser welding machine, characterized in that: The following preheating methods are included: Step 1: Establish a laser welding machine preheating management platform s1: Collect the preheating time required for different welding materials, record the time in the database, and establish a data exchange platform so that users can upload the optimal preheating time and temperature data at any time; s2: Establish a data network so that different users can share data through the data network. During the preheating process, enter the name of the corresponding welding material and the system will automatically match the optimal preheating time and temperature. S3: Establish a backend data verification laboratory to determine the corresponding temperature and time for user-uploaded data, find the best solution, select the best option for different data of the same material, and upload the best experimental data to the database for subsequent uploads of different data of the same material, and continuously update and maintain the backend database. Step 2: Preheat by category S1: Preheating methods are divided into: solder delivery pipe preheating and soldering area preheating; s2: Solder delivery tube preheating: The solder delivery tube is preheated using heating methods such as oxy-acetylene torch heating, resistance heating, and induction heating; S3: Preheating of the welding area: Heating the welding area and surrounding metal to 40 to 150 degrees Celsius. This temperature is affected by the welding material. This process will automatically upload the data to the remote network terminal. The laser welding machine preheating management platform includes a user terminal, a database, and a back-end maintenance terminal. The user terminal provides users with the best welding preheating method and collects user data into the database. The database records the optimal welding time and temperature for different welding materials and updates it in real time. The back-end maintenance terminal will conduct experimental verification on the uploaded data and upload the time data to the database to continuously improve the database content. When establishing the database in step one, it is necessary to first build a user front-end. The user inputs the preheating material in the front-end operation interface, and the system will assign the user the optimal heating temperature and preheating time. At the same time, the user can also add custom preheating materials to update the database. The user interface will be intelligently controlled with the preheating equipment via power supply, and a microcontroller will be used to control the opening and closing of the circuit. The user terminal will collect the user's preheating time, and the user can also report the welding quality to the terminal. Through continuous data accumulation, the optimal welding time and temperature for the corresponding material can be achieved. After the data network is established in step one, the user terminal will be divided into offline mode and online mode. In offline mode, the user chooses not to connect to the network. The user terminal will use the existing data to recommend the preheating time and temperature of the welding material input by the user. The user can adjust it according to their own experience. In the online mode, the user's time will be updated, the optimal welding preheating time and temperature will be transmitted to the user and stored, and customer-defined data will be uploaded. The uploaded data will be used to update the database after being verified by experiments. When the solder delivery tube is preheated, the temperature of resistance heating and induction heating is easier to control than that of soldering torch heating. The preheating method needs to be changed according to the actual situation. During the preheating process of the welding zone, the preheating area is a 30mm radius area centered on the welding center point. The temperature of the heating area is monitored in real time by a temperature sensor during the preheating process. During the categorized welding process, the laser welding head also needs to be cooled to ensure that the preheating of the solder delivery pipeline and the welding area does not heat the laser welding head.