Shielding gas flow monitoring method and system for sheet metal welding equipment

Abstract

The invention discloses a shielding gas flow monitoring method and system for sheet metal welding equipment, relates to the field of sheet metal welding, and solves the problems that in the current sheet metal welding process, flow change is difficult to accurately reflect and an effective abnormal monitoring mode is lacked in shielding gas flow monitoring. The method comprises the steps that the standard shielding gas flow and the required shielding gas volume of a to-be-welded part are calculated according to welding parameters; analyzing the volume of the residual shielding gas in the high-pressure gas cylinder used by the to-be-welded part, and judging whether the residual shielding gas in the high-pressure gas cylinder used by the to-be-welded part is enough for welding or not; in the welding process, the shielding gas flow of the to-be-welded part is monitored in real time, and the real-time state of the shielding gas flow of the to-be-welded part in the welding process is analyzed; intelligent treatment is conducted on the shielding gas flow of the to-be-welded part in different abnormal states; and analyzing the stability of the flow of the shielding gas of the adjusted to-be-welded part. According to the invention, the flow of the shielding gas for the sheet metal welding equipment can be accurately and effectively monitored.

Description

Technical Field

[0001] The present invention belongs to the technical field of sheet metal welding, and in particular relates to a shielding gas flow monitoring method and system for sheet metal welding equipment. Background Art

[0002] During sheet metal welding, the use of shielding gas is crucial to ensuring welding quality. Appropriate shielding gas flow can effectively prevent adverse reactions such as oxidation and nitriding in the welding area, ensuring that the weld is well-formed and meets the strength standards. However, existing sheet metal welding equipment has many shortcomings in shielding gas flow monitoring. On the one hand, traditional monitoring methods are often not accurate enough to accurately reflect flow changes in real time, which may lead to insufficient or excessive shielding gas supply during the welding process, affecting welding quality and even causing material waste. On the other hand, there is a lack of an effective flow abnormality alarm mechanism. Once the shielding gas flow is abnormal, it cannot be fed back to the operator in time for processing, which may lead to welding defects and increase the defective rate of products. To this end, the present invention provides a shielding gas flow monitoring method and system for sheet metal welding equipment. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention aims to provide a shielding gas flow monitoring method and system for sheet metal welding equipment.

[0004] The technical problems to be solved by the present invention are: How to achieve accurate and effective monitoring of the shielding air flow rate for sheet metal welding equipment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for monitoring shielding gas flow for sheet metal welding equipment is as follows: Step S1, calculating the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded according to the welding parameters; Step S2, analyzing the remaining shielding gas volume in the high-pressure gas cylinder used for the welded part to determine whether the remaining shielding gas in the high-pressure gas cylinder used for the welded part is sufficient for welding; Step S3, monitoring the shielding gas flow rate of the workpiece to be welded in real time during the welding process, and analyzing the real-time status of the shielding gas flow rate of the workpiece to be welded during the welding process; Step S4, intelligently processing the shielding gas flow of the workpiece to be welded in different abnormal states according to the signal; Step S5: analyzing the stability of the shielding gas flow rate of the workpiece to be welded after adjustment.

[0006] Preferably, step S1 includes the following sub-steps: Step S11, obtaining welding parameters of the workpiece to be welded; Step S12, calculating the standard shielding gas flow rate Qb of the workpiece to be welded by the formula Qb=k1×I, where k1 is the weight coefficient and I is the welding current; Step S13, calculating the required shielding gas volume V of the workpiece to be welded by the formula V=Qb×t, where t is the welding time.

[0007] Preferably, the welding parameters are the welding current and welding time of the workpieces to be welded.

[0008] Preferably, step S2 includes the following sub-steps: Step S21, obtaining the current pressure in the main supply bottle, and calculating the remaining shielding gas volume Vs in the main supply bottle using the formula Vs=Vz×(Pd / Pc), where Vz is the volume of the main supply bottle, Pd is the current pressure in the main supply bottle, and Pc is the initial pressure in the main supply bottle; Step S22: If the remaining shielding gas volume in the main supply bottle is greater than or equal to the shielding gas volume required by the workpiece to be welded, no operation is performed; Step S23: if the remaining shielding gas volume in the main supply bottle is less than the shielding gas volume required by the workpiece to be welded, a backup supply signal is generated; Step S24: If a backup supply signal is generated, the backup gas cylinder is connected to the main supply cylinder gas circuit.

[0009] Preferably, step S3 includes the following sub-steps: Step S31, collecting the shielding gas flow rate at fixed time intervals, and recording the time point of collecting the shielding gas flow rate as a time node; Step S32: Subtract the standard shielding gas flow rate from the shielding gas flow rate collected at the current time node to obtain a shielding gas flow rate deviation. If the shielding gas flow rate deviation falls within the deviation interval, no operation is performed; if the shielding gas flow rate deviation does not fall within the deviation interval, proceed to the next step. Step S33, collecting the shielding gas flow rate of the workpiece to be welded at multiple time nodes, counting the number of time nodes at which the shielding gas flow rate is greater than the standard shielding gas flow rate, and recording the number of corresponding time nodes as the number of time nodes exceeding the standard; Step S34, similarly, count the number of time nodes where the shielding gas flow rate is equal to the standard shielding gas flow rate among multiple time nodes, and record the number of corresponding time nodes as the normal flow rate number; count the number of time nodes where the shielding gas flow rate is less than the standard shielding gas flow rate among multiple time nodes, and record the number of corresponding time nodes as the non-standard time node number; record the number of time nodes that exceed the standard and the number of time nodes that do not meet the standard as the abnormal flow rate number.

[0010] Preferably, the step S3 further includes the following sub-steps: Step S35, collecting the shielding gas flow rate at the input end and the shielding gas flow rate at the output end of the gas pipeline at the current time node, and subtracting the shielding gas flow rate at the output end of the gas pipeline corresponding to the shielding gas flow rate at the input end of the gas pipeline at the current time node to obtain the loss flow rate; If the loss flow rate does not fall within the loss range, a loss abnormality signal is generated; if the loss flow rate falls within the loss range, the process proceeds to the next step; Step S36, comparing the number of abnormal flow rates with the number of normal flow rates. If the number of abnormal flow rates is smaller than the number of normal flow rates, and the number of abnormal flow rates is smaller than a first threshold, it indicates that the shielding gas flow state of the workpiece to be welded is abnormal at a specific moment, and a transient abnormality signal is generated. Step S37: If the number of abnormal traffic flows is less than the number of normal traffic flows, and the number of abnormal traffic flows is greater than or equal to the first threshold, a continuous abnormality signal is generated; Step S38: If the number of abnormal traffic flows is greater than or equal to the number of normal traffic flows is greater than or equal to the first threshold, a continuous abnormality signal is generated.

[0011] Preferably, step S4 includes the following sub-steps: Step S41: If a loss abnormality signal is generated, the gas pipeline is inspected; Step S42: If an instantaneous abnormal signal is generated, the shielding gas flow rate to the workpiece to be welded is continuously monitored; Step S43: If a continuous abnormal signal is generated, the number of time nodes exceeding the standard is subtracted from the number of time nodes failing to meet the standard to obtain the quantity difference; Step S44, when the quantity difference is greater than zero, adjusting the pressure in the main supply bottle; Step S45: When the quantity difference is less than zero, the pressure in the main supply bottle is monitored.

[0012] Preferably, step S5 includes the following sub-steps: Step S51, monitoring and analyzing the adjusted shielding gas flow rate again; If the shielding gas flow deviation does not fall within the deviation range, it means that the shielding gas flow of the workpiece to be welded is still in an abnormal state after adjustment, and an emergency stop signal is generated; Step S52: If the shielding gas flow deviation falls within the deviation range, it means that the shielding gas flow of the workpiece to be welded is in a normal state after adjustment, and then proceed to the next step; Step S53, performing a stability analysis on the shielding gas flow rate of the workpiece to be welded; Step S54: if the first stable signal is generated, no operation is performed; If the second stable signal or the third stable signal is generated, the stability of the shielding gas flow rate to the workpiece to be welded is continuously monitored.

[0013] Preferably, the stability analysis process in step S53 is as follows: Step S531, collecting the shielding gas flow rates of the parts to be welded at different time nodes, subtracting the shielding gas flow rates of the parts to be welded at adjacent time nodes and taking the absolute value to obtain the amplitude change value; Step S532: If the amplitude change value is greater than or equal to the amplitude threshold, an unstable signal is generated; if the amplitude change value is less than the amplitude threshold, the process proceeds to the next step; Step S533, calculating the mean of the shielding gas flow rate of the workpiece to be welded at different time points and recording it as the mean flow rate, taking the mean flow rate as the midpoint of the interval, and extending fixed values to the left and right sides of the midpoint of the interval to construct a flow fluctuation interval; Step S534, counting the number of time nodes when the shielding gas flow rate of the workpiece to be welded falls within the flow fluctuation range, and recording the corresponding time node number as the normal time node number; Similarly, the number of time nodes at which the shielding gas flow rate of the workpiece to be welded does not fall within the flow fluctuation range is counted, and the corresponding time node number is recorded as the abnormal time node number; Step S535: If the number of normal time nodes is greater than or equal to the stability threshold, and the number of abnormal time nodes is less than the stability threshold, a first stable signal is generated; if the number of normal time nodes is less than the stability threshold, and the number of abnormal time nodes is less than the stability threshold, a second stable signal is generated; if the number of abnormal time nodes is greater than or equal to the stability threshold, a third stable signal is generated; wherein, the stability of the first stable signal is stronger than the stability of the second stable signal, and the stability of the second stable signal is stronger than the stability of the third stable signal.

[0014] The present invention also adopts the following technical solution: a shielding gas flow monitoring system for sheet metal welding equipment, comprising: A data acquisition module is used to calculate the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded based on the welding parameters; The capacity analysis module is used to analyze the remaining shielding gas volume in the high-pressure gas cylinder used for the welded parts, and determine whether the remaining shielding gas in the high-pressure gas cylinder used for the welded parts is sufficient for welding; A real-time monitoring module is used to monitor the shielding gas flow rate of the workpiece to be welded in real time during the welding process and analyze the real-time status of the shielding gas flow rate of the workpiece to be welded during the welding process; Intelligent processing module, used to intelligently process the shielding gas flow of the welded parts in different abnormal states according to the signal; The stability analysis module is used to analyze the stability of the shielding gas flow of the workpiece to be welded after adjustment.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention calculates the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded based on the welding parameters, and then analyzes the remaining shielding gas volume in the high-pressure gas cylinder used for the workpiece to be welded to determine whether the remaining shielding gas in the high-pressure gas cylinder used for the workpiece to be welded is sufficient for welding; 2. The present invention monitors the shielding gas flow of the workpiece to be welded in real time during the welding process, analyzes the real-time status of the shielding gas flow of the workpiece to be welded during the welding process, and intelligently processes the shielding gas flow of the workpiece to be welded in different abnormal states based on the signal. Finally, the stability of the shielding gas flow of the workpiece to be welded after adjustment is analyzed. The present invention realizes accurate and effective monitoring of the shielding gas flow of sheet metal welding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0017] Figure 1 is a flow chart of the method of the present invention; Figure 2 Schematic diagram of the structure of the high-pressure gas cylinder in the present invention; Figure 3 Schematic diagram of the structure of the gas pipeline in the present invention; Figure 4 This is a block diagram of the overall system of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1-Figure 3 As shown, the technical solution provided by the present invention is: a shielding gas flow monitoring method for sheet metal welding equipment. In this embodiment, the product welded by the sheet metal welding equipment is recorded as the workpiece to be welded. The method is specifically as follows: Step S1, calculating the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded according to the welding parameters; In this embodiment, the calculation process in step S1 is as follows: Step S11, obtaining welding parameters of the workpiece to be welded; Specifically, welding parameters include the welding current and welding time of the workpiece to be welded. The welding parameters are determined according to the production plan and the complexity of the welding task. For welding large workpieces, a longer welding time is required, while for welding small workpieces, a shorter welding time is required. Different welding currents are required for different electrode diameters. Step S12, calculating the standard shielding gas flow rate Qb of the workpiece to be welded by the formula Qb=k1×I, where k1 is the weight coefficient and I is the welding current; What needs to be explained specifically is that the greater the welding current, the higher the heat generated during welding, the larger the volume of the molten pool, and the shielding gas flow rate needs to be increased; Step S13, calculating the required shielding gas volume V of the workpiece to be welded by the formula V=Qb×t, where t is the welding time.

[0020] Step S2, analyzing the remaining shielding gas volume in the high-pressure gas cylinder used for the welded part to determine whether the remaining shielding gas in the high-pressure gas cylinder used for the welded part is sufficient for welding; Specifically, the shielding gas used for the welded parts is stored in high-pressure gas cylinders, the currently used high-pressure gas cylinder is recorded as the main supply cylinder, and the other high-pressure gas cylinders are recorded as spare cylinders; In this embodiment, the analysis process of step S2 is as follows: Step S21, obtaining the current pressure in the main supply bottle, and calculating the remaining shielding gas volume Vs in the main supply bottle using the formula Vs=Vz×(Pd / Pc), where Vz is the volume of the main supply bottle, Pd is the current pressure in the main supply bottle, and Pc is the initial pressure in the main supply bottle; Specifically, the current pressure in the main supply bottle can be obtained from the pressure gauge of the main supply bottle. The initial pressure in the main supply bottle is the pressure when the main supply bottle is filled with shielding gas. During the welding process, the volume of the remaining shielding gas in the main supply bottle decreases as the current pressure in the main supply bottle decreases. Step S22: If the remaining shielding gas volume in the main supply bottle is greater than or equal to the shielding gas volume required by the workpiece to be welded, no operation is performed; Step S23: if the remaining shielding gas volume in the main supply bottle is less than the shielding gas volume required by the workpiece to be welded, a backup supply signal is generated; Step S24: If a backup supply signal is generated, the backup gas cylinder is connected to the main supply cylinder gas circuit; Carry out welding work after ensuring that the remaining shielding gas in the main supply cylinder or spare cylinder is sufficient for welding.

[0021] Step S3, monitoring the shielding gas flow rate of the workpiece to be welded in real time during the welding process, and analyzing the real-time status of the shielding gas flow rate of the workpiece to be welded during the welding process; In this embodiment, the monitoring and analysis process of step S3 is as follows: Step S31, collecting the shielding gas flow rate at fixed time intervals, and recording the time point of collecting the shielding gas flow rate as a time node; Specifically, the flow rate of the protective gas can be collected through a flow sensor; Step S32: Subtract the standard shielding gas flow rate from the shielding gas flow rate collected at the current time node to obtain a shielding gas flow rate deviation. If the shielding gas flow rate deviation falls within the deviation interval, it indicates that the shielding gas flow rate deviation is within the allowable range, and no operation is performed; if the shielding gas flow rate deviation does not fall within the deviation interval, it indicates that the shielding gas flow rate deviation is not within the allowable range, and the process proceeds to the next step. Specifically, if the shielding gas flow deviation at the current time node does not fall within the deviation range, further analysis is required to determine whether the shielding gas flow of the workpiece to be welded is abnormal in a transient or continuous manner. Step S33, collecting the shielding gas flow rate of the workpiece to be welded at multiple time nodes, counting the number of time nodes at which the shielding gas flow rate is greater than the standard shielding gas flow rate, and recording the number of corresponding time nodes as the number of time nodes exceeding the standard; In step S34, similarly, the number of time nodes at which the shielding gas flow rate is equal to the standard shielding gas flow rate is counted among the multiple time nodes, and the number of corresponding time nodes is recorded as the normal flow rate number; the number of time nodes at which the shielding gas flow rate is less than the standard shielding gas flow rate is counted among the multiple time nodes, and the number of corresponding time nodes is recorded as the non-standard time node number; the number of time nodes at which the standard is exceeded and the number of time nodes at which the standard is not reached are recorded as the abnormal flow rate number; Step S35: collecting the shielding gas flow rate at the input end and the shielding gas flow rate at the output end of the gas pipeline at the current time node, and subtracting the shielding gas flow rate at the output end of the gas pipeline corresponding to the input end at the current time node to obtain the loss flow rate. If the loss flow rate does not fall within the loss range, a loss abnormality signal is generated. If the loss flow rate falls within the loss range, proceeding to the next step; The gas pipeline is used to transport the protective gas, the input end of the gas pipeline is used to receive the protective gas in the main supply cylinder and the spare gas cylinder, and the output end of the gas pipeline is used to output the protective gas; Step S36, comparing the number of abnormal flow rates with the number of normal flow rates. If the number of abnormal flow rates is smaller than the number of normal flow rates, and the number of abnormal flow rates is smaller than a first threshold, it indicates that the shielding gas flow state of the workpiece to be welded is abnormal at a specific moment, and a transient abnormality signal is generated. Step S37: If the number of abnormal traffic flows is less than the number of normal traffic flows, and the number of abnormal traffic flows is greater than or equal to the first threshold, a continuous abnormality signal is generated; Step S38: If the number of abnormal traffic flows is greater than or equal to the number of normal traffic flows is greater than or equal to the first threshold, a continuous abnormality signal is generated.

[0022] Step S4, intelligently processing the shielding gas flow of the workpiece to be welded in different abnormal states according to the signal; In this embodiment, the intelligent processing process in step S4 is as follows: Step S41: If a loss abnormality signal is generated, the gas pipeline is inspected; Step S42: If an instantaneous abnormal signal is generated, the shielding gas flow rate to the workpiece to be welded is continuously monitored; Step S43: If a continuous abnormal signal is generated, the number of time nodes exceeding the standard is subtracted from the number of time nodes failing to meet the standard to obtain the quantity difference; Step S44: When the quantity difference is greater than zero, indicating that the overall flow rate of the shielding gas to the workpiece to be welded is on the high side, the pressure in the main supply bottle is adjusted; Specifically, the pressure in the main supply bottle can be adjusted by adjusting the proportional valve. During the adjustment of the proportional valve, the shielding gas flow rate is continuously monitored in real time to see whether it gradually stabilizes within the allowable deviation range. If the flow deviation still does not fall within the deviation range, the opening of the proportional valve is further adjusted until the shielding gas flow deviation falls within the deviation range. In step S45, when the quantity difference is less than zero, indicating that the overall shielding gas flow rate of the workpiece to be welded is on a low trend, the pressure in the main supply bottle is monitored. When the current pressure in the main supply bottle drops to a second pressure threshold, a current signal is sent to the solenoid valve of the backup gas bottle to open the solenoid valve of the backup gas bottle. At the same time, the current signal is stopped from being sent to the solenoid valve of the main supply bottle to close the solenoid valve of the main supply bottle. Specifically, when the shielding gas in the high-pressure gas cylinder is exhausted, the pressure in the high-pressure gas cylinder does not drop to zero, but is maintained at a first pressure threshold. Maintaining the first pressure threshold can prevent moisture, dust, and other impurities in the air from entering the high-pressure gas cylinder, thereby avoiding corrosion or contamination of the interior of the high-pressure gas cylinder. If the backup gas cylinder is switched to supply gas only when the current pressure in the main supply cylinder drops to the first pressure threshold, the gas supply will be discontinuous. Therefore, the backup gas cylinder is switched to supply gas when the current pressure in the main supply cylinder drops to the second pressure threshold. In this embodiment, the electromagnetic valves used by the main supply cylinder and the backup gas cylinder are normally closed electromagnetic valves, and the value of the second pressure threshold is greater than the value of the first pressure threshold.

[0023] Step S5, analyzing the stability of the shielding gas flow rate of the workpiece to be welded after adjustment; In this embodiment, the analysis process in step S5 is as follows: Step S51, repeating the operations of steps S31 and S32 for the adjusted shielding gas flow rate, i.e., monitoring and analyzing the shielding gas flow rate. If the shielding gas flow rate deviation does not fall within the deviation range, indicating that the shielding gas flow rate of the workpiece to be welded is still in an abnormal state after adjustment, an emergency stop signal is generated; Specifically, when an emergency stop signal is generated, the welding work of the workpiece to be welded is stopped; Step S52: If the shielding gas flow deviation falls within the deviation range, it means that the shielding gas flow of the workpiece to be welded is in a normal state after adjustment, and then proceed to the next step; Step S53, performing a stability analysis on the shielding gas flow rate of the workpiece to be welded; Specifically, the stability analysis process in step S53 is as follows: Step S531, collecting the shielding gas flow rates of the parts to be welded at different time nodes, subtracting the shielding gas flow rates of the parts to be welded at adjacent time nodes and taking the absolute value to obtain the amplitude change value; Step S532: if the amplitude change value is greater than or equal to the amplitude threshold, an unstable signal is generated; If the amplitude change value is less than the amplitude threshold, proceed to the next step; Step S533, calculating the mean of the shielding air flow rate of the workpiece to be welded at different time points and recording it as the mean flow rate, taking the mean flow rate as the midpoint of the interval, and extending fixed values to the left and right sides of the midpoint of the interval to construct a flow fluctuation interval; Step S534, counting the number of time nodes when the shielding gas flow rate of the workpiece to be welded falls within the flow fluctuation range, and recording the corresponding time node number as the normal time node number; Similarly, the number of time nodes at which the shielding gas flow rate of the workpiece to be welded does not fall within the flow fluctuation range is counted, and the corresponding time node number is recorded as the abnormal time node number; Step S535: If the number of normal time nodes is greater than or equal to the stability threshold, and the number of abnormal time nodes is less than the stability threshold, a first stability signal is generated; If the number of normal time nodes is less than the stability threshold, and the number of abnormal time nodes is less than the stability threshold, a second stability signal is generated; If the number of abnormal time nodes is greater than or equal to the stability threshold, a third stability signal is generated; Step S54: if the first stable signal is generated, no operation is performed; If the second stable signal or the third stable signal is generated, the stability of the protective gas flow rate of the welded workpiece is continuously monitored; wherein the stability of the first stable signal is stronger than the stability of the second stable signal, and the stability of the second stable signal is stronger than the stability of the third stable signal.

[0024] In this application, if a corresponding calculation formula appears, the above calculation formula is dimensionless and its numerical calculation is performed. The weight coefficient, proportional coefficient and other coefficients in the formula are set to a result value obtained by quantifying each parameter. Regarding the size of the weight coefficient and the proportional coefficient, as long as it does not affect the proportional relationship between the parameter and the result value, it is acceptable.

[0025] Example 2: Figure 4 As shown, based on another concept of the same invention, a shielding gas flow monitoring system for sheet metal welding equipment is now proposed, comprising: A data acquisition module is used to calculate the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded based on the welding parameters; The capacity analysis module is used to analyze the remaining shielding gas volume in the high-pressure gas cylinder used for the welded parts, and determine whether the remaining shielding gas in the high-pressure gas cylinder used for the welded parts is sufficient for welding; A real-time monitoring module is used to monitor the shielding gas flow rate of the workpiece to be welded in real time during the welding process and analyze the real-time status of the shielding gas flow rate of the workpiece to be welded during the welding process; Intelligent processing module, used to intelligently process the shielding gas flow of the welded parts in different abnormal states according to the signal; The stability analysis module is used to analyze the stability of the shielding gas flow of the workpiece to be welded after adjustment.

[0026] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A shielding gas flow monitoring method for sheet metal welding equipment, characterized in that: Shielding gas flow monitoring methods include: Step S1, calculating the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded according to the welding parameters; Step S2, analyzing the remaining shielding gas volume in the high-pressure gas cylinder used for the welded part to determine whether the remaining shielding gas in the high-pressure gas cylinder used for the welded part is sufficient for welding; Step S3, monitoring the shielding gas flow rate of the workpiece to be welded in real time during the welding process, and analyzing the real-time status of the shielding gas flow rate of the workpiece to be welded during the welding process; Step S4, intelligently processing the shielding gas flow of the workpiece to be welded in different abnormal states according to the signal; Step S5: analyzing the stability of the shielding gas flow rate of the workpiece to be welded after adjustment.

2. The shielding gas flow monitoring method for sheet metal welding equipment according to claim 1, characterized in that: The step S1 includes the following sub-steps: Step S11, obtaining welding parameters of the workpiece to be welded; Step S12, calculating the standard shielding gas flow rate of the workpiece to be welded; In step S13, the required volume of shielding gas for the workpiece to be welded is then calculated.

3. The shielding gas flow monitoring method for sheet metal welding equipment according to claim 2, characterized in that: Welding parameters are the welding current and welding time of the workpiece to be welded.

4. The shielding gas flow monitoring method for sheet metal welding equipment according to claim 3, characterized in that: The step S2 includes the following sub-steps: Step S21, obtaining the current pressure in the main supply bottle and calculating the remaining shielding gas volume in the main supply bottle; Step S22: If the remaining shielding gas volume in the main supply bottle is greater than or equal to the shielding gas volume required by the workpiece to be welded, no operation is performed; Step S23: if the remaining shielding gas volume in the main supply bottle is less than the shielding gas volume required by the workpiece to be welded, a backup supply signal is generated; Step S24: If a backup supply signal is generated, the backup gas cylinder is connected to the main supply cylinder gas circuit.

5. The shielding gas flow monitoring method for sheet metal welding equipment according to claim 1, characterized in that: The step S3 includes the following sub-steps: Step S31, collecting the shielding gas flow rate at fixed time intervals, and recording the time point of collecting the shielding gas flow rate as a time node; Step S32: subtracting the standard shielding gas flow rate from the shielding gas flow rate collected at the current time node to obtain a shielding gas flow rate deviation. If the shielding gas flow rate deviation falls within the deviation interval, no operation is performed. If the shielding gas flow deviation does not fall within the deviation range, proceed to the next step; Step S33, collecting the shielding gas flow rate of the workpiece to be welded at multiple time nodes, counting the number of time nodes at which the shielding gas flow rate is greater than the standard shielding gas flow rate, and recording the number of corresponding time nodes as the number of time nodes exceeding the standard; Step S34: Similarly, the number of time nodes at which the shielding gas flow rate is equal to the standard shielding gas flow rate is counted among the multiple time nodes, and the number of the corresponding time nodes is recorded as the normal flow rate number; Count the number of time nodes where the shielding gas flow rate is less than the standard shielding gas flow rate among multiple time nodes, and record the number of corresponding time nodes as the number of time nodes that do not meet the standard; record the number of time nodes that exceed the standard and the number of time nodes that do not meet the standard as the number of flow abnormalities.

6. The shielding gas flow monitoring method for sheet metal welding equipment according to claim 5, characterized in that: The step S3 further includes the following sub-steps: Step S35, collecting the shielding gas flow rate at the input end and the shielding gas flow rate at the output end of the gas pipeline at the current time node, and subtracting the shielding gas flow rate at the output end of the gas pipeline corresponding to the shielding gas flow rate at the input end of the gas pipeline at the current time node to obtain the loss flow rate; If the loss flow rate does not fall within the loss range, a loss abnormality signal is generated; if the loss flow rate falls within the loss range, the process proceeds to the next step; Step S36, comparing the number of abnormal flow rates with the number of normal flow rates. If the number of abnormal flow rates is smaller than the number of normal flow rates, and the number of abnormal flow rates is smaller than a first threshold, it indicates that the shielding gas flow state of the workpiece to be welded is abnormal at a specific moment, and a transient abnormality signal is generated. Step S37: If the number of abnormal traffic flows is less than the number of normal traffic flows, and the number of abnormal traffic flows is greater than or equal to the first threshold, a continuous abnormality signal is generated; Step S38: If the number of abnormal traffic flows is greater than or equal to the number of normal traffic flows is greater than or equal to the first threshold, a continuous abnormality signal is generated.

7. The method for monitoring shielding gas flow for sheet metal welding equipment according to claim 6, characterized in that: The step S4 includes the following sub-steps: Step S41: If a loss abnormality signal is generated, the gas pipeline is inspected; Step S42: If an instantaneous abnormal signal is generated, the shielding gas flow rate to the workpiece to be welded is continuously monitored; Step S43: If a continuous abnormal signal is generated, the number of time nodes exceeding the standard is subtracted from the number of time nodes failing to meet the standard to obtain the quantity difference; Step S44, when the quantity difference is greater than zero, adjusting the pressure in the main supply bottle; Step S45: When the quantity difference is less than zero, the pressure in the main supply bottle is monitored.

8. The method for monitoring shielding gas flow rate for sheet metal welding equipment according to claim 7, characterized in that: The step S5 includes the following sub-steps: Step S51, monitoring and analyzing the adjusted shielding gas flow rate again; If the shielding gas flow deviation does not fall within the deviation range, it means that the shielding gas flow of the workpiece to be welded is still in an abnormal state after adjustment, and an emergency stop signal is generated; Step S52: If the shielding gas flow deviation falls within the deviation range, it means that the shielding gas flow of the workpiece to be welded is in a normal state after adjustment, and then proceed to the next step; Step S53, performing a stability analysis on the shielding gas flow rate of the workpiece to be welded; Step S54: if the first stable signal is generated, no operation is performed; If the second stable signal or the third stable signal is generated, the stability of the shielding gas flow rate to the workpiece to be welded is continuously monitored.

9. The shielding gas flow monitoring method for sheet metal welding equipment according to claim 8, characterized in that: The stationarity analysis process in step S53 is as follows: Step S531, collecting the shielding gas flow rates of the parts to be welded at different time nodes, subtracting the shielding gas flow rates of the parts to be welded at adjacent time nodes and taking the absolute value to obtain the amplitude change value; Step S532: If the amplitude change value is greater than or equal to the amplitude threshold, an unstable signal is generated; if the amplitude change value is less than the amplitude threshold, the process proceeds to the next step; Step S533, calculating the mean of the shielding gas flow rate of the workpiece to be welded at different time points and recording it as the mean flow rate, taking the mean flow rate as the midpoint of the interval, and extending fixed values to the left and right sides of the midpoint of the interval to construct a flow fluctuation interval; Step S534, counting the number of time nodes when the shielding gas flow rate of the workpiece to be welded falls within the flow fluctuation range, and recording the corresponding time node number as the normal time node number; Similarly, the number of time nodes at which the shielding gas flow rate of the workpiece to be welded does not fall within the flow fluctuation range is counted, and the corresponding time node number is recorded as the abnormal time node number; Step S535: If the number of normal time nodes is greater than or equal to the stability threshold, and the number of abnormal time nodes is less than the stability threshold, a first stable signal is generated; if the number of normal time nodes is less than the stability threshold, and the number of abnormal time nodes is less than the stability threshold, a second stable signal is generated; if the number of abnormal time nodes is greater than or equal to the stability threshold, a third stable signal is generated; wherein, the stability of the first stable signal is stronger than the stability of the second stable signal, and the stability of the second stable signal is stronger than the stability of the third stable signal.

10. A shielding gas flow monitoring system for sheet metal welding equipment, characterized in that: In combination with a shielding gas flow monitoring method for sheet metal welding equipment according to any one of claims 1 to 9, the method comprises: A data acquisition module is used to calculate the standard shielding gas flow rate and required shielding gas volume of the workpiece to be welded based on the welding parameters; The capacity analysis module is used to analyze the remaining shielding gas volume in the high-pressure gas cylinder used for the welded parts, and determine whether the remaining shielding gas in the high-pressure gas cylinder used for the welded parts is sufficient for welding; A real-time monitoring module is used to monitor the shielding gas flow rate of the workpiece to be welded in real time during the welding process and analyze the real-time status of the shielding gas flow rate of the workpiece to be welded during the welding process; Intelligent processing module, used to intelligently process the shielding gas flow of the welded parts in different abnormal states according to the signal; The stability analysis module is used to analyze the stability of the shielding gas flow of the workpiece to be welded after adjustment.

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