A method for calculating carbon emissions of welding operation in shipbuilding stage considering energy and material consumption

Abstract

The present application relates to the technical field of welding test methods, in particular to a ship manufacturing stage welding operation carbon emission calculation method considering energy and material consumption, comprising: step S1: welding operation classification and data acquisition preparation; step S2: welding process data acquisition; step S3: unit length weld consumption data calculation; step S4: unit length weld carbon emission calculation; and step S5: total carbon emission calculation. Through real-time acquisition of welding electric energy, welding wire and gas data and establishment of a unit length weld carbon emission model, the problem of accurate accounting of CO2 welding operation carbon emission in ship manufacturing is solved.

Description

Technical Field

[0001] This invention relates to the field of welding testing methods, specifically to a method for calculating carbon emissions from welding operations during the shipbuilding stage, taking into account energy and material consumption. Background Technology

[0002] Against the backdrop of global efforts to address climate change and achieve carbon neutrality, welding, as an indispensable joining technology in industrial manufacturing, accounts for a significant portion of the workload in sectors such as shipbuilding, automobile manufacturing, and rail transportation. Its carbon emission accounting has become a key focus for the low-carbon transformation of the manufacturing industry. Although advanced welding technologies such as laser welding and friction stir welding are constantly emerging, their widespread application in shipbuilding remains limited due to high equipment costs and constraints on operating conditions. Therefore, many shipbuilding companies still widely use traditional carbon dioxide gas shielded welding, making research into carbon emission accounting methods for this process an urgent practical need.

[0003] Data acquisition for CO2 gas shielded welding operations faces challenges such as difficulty in synchronously acquiring multi-source data, complex and diverse process conditions, and lack of calculation for weld length per unit length. Specifically, this process involves the consumption of multiple energy sources and materials, including electricity, welding wire, and shielding gas. Both direct carbon emissions (such as shielding gas emissions) and indirect carbon emissions (such as electricity production and welding wire manufacturing) must be considered simultaneously, making the synchronous and accurate acquisition of data from all three sources highly challenging. Furthermore, in actual workshop manufacturing, different joint types (such as fillet welding and butt welding) and welding positions (flat welding, vertical welding, and overhead welding) are required due to varying design requirements and construction environments. These differences result in significant variations in current, voltage, and welding wire consumption rates. Overhead and vertical welding also require consideration of the issue of molten metal dripping due to an uneven weld pool, necessitating a reduction in welding speed. These process differences must be considered separately in carbon emission calculations.

[0004] Existing technologies have significant shortcomings in calculating carbon emissions from welding. On the one hand, existing technologies such as the "General Rules for Quantifying the Carbon Footprint of Ship Products" (T / CANSI 173—2025) and the "Requirements for Carbon Footprint Accounting and Reporting of Shipbuilding and Repair Enterprises" (DB 3309 / T 113—2024) mainly focus on the entire life cycle of ship products or the overall carbon footprint of enterprises, without establishing a specific accounting system for the CO2 gas shielded welding process, thus failing to reflect the refined characteristics of energy and material consumption during welding. On the other hand, existing patents such as CN116117363B (Energy Consumption Detection Method for Laser Welding Process) only address energy consumption detection in laser welding, CN115841081B (Optimization Method for Welding Process Parameters Based on Welding Quality, Cost, and Carbon Emissions) do not involve real-time data acquisition and carbon emission calculation per unit length of weld, and application number CN202511561656.5 (Carbon Emission Calculation Method and System for Laser Welding System for Aluminum Alloys in Automobiles) focus on laser welding of aluminum alloys in automobiles, none of which involve CO2 welding processes in shipbuilding. Existing technologies mostly rely on empirical formulas or statistical methods to estimate carbon emissions, lacking real-time data acquisition capabilities, making it difficult to accurately reflect the differences in carbon emissions under different welding process parameters.

[0005] In summary, existing technologies generally lack specific carbon emission calculation methods for CO2 gas shielded welding operations during the shipbuilding stage, particularly in terms of the relevance of the calculation targets, real-time data acquisition, consideration of welding process differences, calculation methods per unit length of weld, and flexibility in the application of carbon factors. Developing a carbon emission calculation method for CO2 gas shielded welding that can integrate multi-source data acquisition, consider process differences, and support calculations per unit length of weld is of great significance for shipbuilding enterprises to achieve precise carbon management and meet the "dual carbon" requirements of the International Maritime Organization (IMO) and domestic regulations. Summary of the Invention

[0006] To address the aforementioned issues, a method for calculating carbon emissions from welding operations during the shipbuilding phase that considers energy and material consumption is provided. By collecting welding electrical energy, welding wire, and gas data in real time and establishing a carbon emission model per unit length of weld, the problem of accurate carbon emission calculation for CO2 welding operations in shipbuilding is solved.

[0007] To address the problems of existing technologies, this invention provides a method for calculating carbon emissions from welding operations during the shipbuilding stage, taking into account energy and material consumption, comprising the following steps:

[0008] Step S1: Welding operation classification and data acquisition preparation,

[0009] Based on the needs of shipbuilding, CO2 gas shielded welding operations are classified and data acquisition equipment is installed.

[0010] Step S2: Welding process data acquisition.

[0011] Experimental data were collected for different welding methods to obtain data on energy and material consumption during the welding process;

[0012] Step S3: Calculate the data consumption per unit length of weld.

[0013] The collected data is processed to calculate the energy and material consumption per unit length of weld under different welding methods;

[0014] Step S4: Calculation of carbon emissions per unit length of weld.

[0015] Based on the energy and material consumption per unit length of weld and the corresponding carbon emission factor, calculate the carbon emission per unit length of weld under different welding methods.

[0016] Step S5: Calculate total carbon emissions.

[0017] Calculate the total carbon emissions from CO2 gas shielded welding operations based on the length of each weld seam in the product design.

[0018] In some examples of the present invention, in step S1, the carbon dioxide gas shielded welding operation in the shipbuilding process is divided into six welding methods according to the joint type and welding position: fillet flat welding, fillet vertical welding, fillet overhead welding, butt flat welding, butt vertical welding, and butt overhead welding.

[0019] In some examples of the present invention, the data acquisition device includes:

[0020] Install current measuring equipment and voltage measuring equipment at the output end of the carbon dioxide gas shielded welding machine cable in the production workshop;

[0021] Install welding wire measuring equipment on the wire feeding device;

[0022] Install an airflow meter between the carbon dioxide delivery pipeline and the welding torch.

[0023] The data acquisition device is used to acquire data on power consumption, welding wire consumption, and carbon dioxide gas consumption during the welding process.

[0024] In some examples of the present invention, step S2 includes:

[0025] Step S2.1: Collect power consumption data.

[0026] By installing current and voltage measuring devices at the output end of the welding machine cable, the current during the welding process is measured. ),Voltage( ),time( ) and correction factor ( ), combined with the welding machine's correction factor ( According to the formula Calculate the electrical energy consumption during the welding process ( ).

[0027] In some examples of the present invention, step S2 includes:

[0028] Step S2.2: Welding wire consumption data collection.

[0029] The wire feeding speed is monitored by a wire measuring device installed on the wire feeding device. ), combined with welding time ( ), cross-sectional area of ​​welding wire ( ) and the density of the welding wire ( According to the formula Calculate the weight of welding wire consumed during the welding process ( ).

[0030] In some examples of the present invention, step S2 includes:

[0031] Step S2.3: Collect carbon dioxide gas consumption data.

[0032] The flow rate of carbon dioxide gas was measured by installing a flow meter between the carbon dioxide delivery pipeline and the welding torch. ), combined with welding time ( ) and flow meter cross-sectional area ( According to the formula Calculate the volume of carbon dioxide gas consumed during the welding process ( ).

[0033] In some examples of the present invention, step S2 includes:

[0034] Step S2.4: Record the weld length.

[0035] While collecting the above data, the weld length for each welding operation was recorded. ).

[0036] In some examples of the present invention, in step S3, the process of step S2 is repeated to obtain multiple sets of energy and material consumption data and corresponding weld lengths under different welding methods. The obtained electrical energy consumption ( ), weight of welding wire consumed ( ) and the volume of carbon dioxide gas ( Take the average value for each, and divide by the corresponding weld length. The electrical energy, welding wire, and carbon dioxide gas consumed per unit length of weld under different joint types and welding positions were obtained.

[0037] In some examples of the present invention, in step S4, the carbon emissions per unit length of weld under different welding methods are calculated based on the composition of the welding materials used for welding, the power composition of the power grid area, and the concentration of carbon dioxide shielding gas. ), carbon emissions ( The formula for calculating ) is:

[0038] , ,

[0039] in, This refers to the carbon emissions per unit length of weld. This refers to the carbon emissions corresponding to electricity. This represents the carbon emissions corresponding to the welding wire. This represents the carbon emissions corresponding to carbon dioxide gas. This refers to the weld length.

[0040] In some examples of the present invention, in step S5, the carbon emissions per unit length of weld under six different welding methods obtained in step S4 are ( ) and the length of each CO2 gas shielded weld in the product design ( Multiply by the carbon emissions of all welds, and then add up the carbon emissions of all welds to obtain the total carbon dioxide emissions directly and indirectly caused by the gas shielded welding operation. The calculation formula is as follows:

[0041] .

[0042] The advantages of this invention compared to the prior art are:

[0043] This invention achieves real-time synchronous data acquisition of three consumption sources: electrical energy, welding wire, and shielding gas. This is achieved by adding current and voltage measuring devices to the output end of the welding machine cable, welding wire measuring devices to the wire feeding device, and a gas flow meter between the carbon dioxide delivery pipeline and the welding torch. By introducing correction coefficients to account for factors such as the welding machine's service life and the construction environment, the calculation accuracy is improved. A carbon emission calculation model based on the unit length of the weld seam is established, enabling refined calculations for six welding methods, accurately reflecting the energy and material consumption of carbon dioxide gas shielded welding. This model can be used for carbon emission accounting of existing ships as well as carbon emission prediction for ships not yet built, providing crucial support for low-carbon optimization during the ship design phase. Because it collects energy and material consumption data, the evaluation results are unaffected by different brands and models of welding machines and welding materials, exhibiting good universality. Furthermore, the carbon emission factor selection is flexible, employing both life-cycle carbon factors and manufacturing-stage carbon factors to meet the application needs of different evaluation perspectives. By subdividing welding operations into six types and calculating them separately, enterprises can accurately grasp the carbon emission characteristics of different welding processes, providing data support for welding process optimization, carbon emission target decomposition, and emission reduction measure formulation, thereby achieving refined management of welding operations. Attached Figure Description

[0044] Figure 1 This is a flowchart of a method for calculating carbon emissions from welding operations during the shipbuilding stage, taking into account energy and material consumption, according to the present invention.

[0045] Figure 2 This is a schematic diagram of equipment connections in a method for calculating carbon emissions from welding operations during the shipbuilding stage that considers energy and material consumption, according to the present invention.

[0046] Figure 3 This is a schematic diagram of six operation types designed according to the present invention, which considers energy and material consumption in the calculation of carbon emissions from welding operations during the shipbuilding stage.

[0047] The numbers on the map are: Detailed Implementation

[0048] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0049] Reference Figure 1 and Figure 2 The method shown here for calculating carbon emissions from welding operations during the shipbuilding phase, taking into account energy and material consumption, includes the following steps:

[0050] Step S1: Welding operation classification and data acquisition preparation,

[0051] Based on the needs of shipbuilding, CO2 gas shielded welding operations are classified and data acquisition equipment is installed.

[0052] Step S2: Welding process data acquisition.

[0053] Experimental data were collected for different welding methods to obtain data on energy and material consumption during the welding process;

[0054] Step S3: Calculate the data consumption per unit length of weld.

[0055] The collected data is processed to calculate the energy and material consumption per unit length of weld under different welding methods;

[0056] Step S4: Calculation of carbon emissions per unit length of weld.

[0057] Based on the energy and material consumption per unit length of weld and the corresponding carbon emission factor, calculate the carbon emission per unit length of weld under different welding methods.

[0058] Step S5: Calculate total carbon emissions.

[0059] Calculate the total carbon emissions from CO2 gas shielded welding operations based on the length of each weld seam in the product design.

[0060] In some examples of the present invention, in step S1, the carbon dioxide gas shielded welding operation in the shipbuilding process is divided into six welding methods according to the joint type and welding position: fillet flat welding, fillet vertical welding, fillet overhead welding, butt flat welding, butt vertical welding, and butt overhead welding.

[0061] In some examples of the present invention, the data acquisition device includes:

[0062] Install current measuring equipment and voltage measuring equipment at the output end of the carbon dioxide gas shielded welding machine cable in the production workshop;

[0063] Install welding wire measuring equipment on the wire feeding device;

[0064] Install an airflow meter between the carbon dioxide delivery pipeline and the welding torch.

[0065] The data acquisition device is used to acquire data on power consumption, welding wire consumption, and carbon dioxide gas consumption during the welding process.

[0066] Specifically, ship sections require extensive CO2 gas shielded welding during production. Based on the hull structure design and construction process requirements, welding operations are categorized into the following six types according to joint type and welding location (see...). Figure 3 ):

[0067] 1. Fillet weld: Used for the connection between the outer plating and ribs of a ship. The welding torch is perpendicular to the surface of the workpiece, and the welding position is a flat weld.

[0068] 2. Corner joint vertical welding: Used for the connection of vertical structures of ship hulls. The weld is vertical and the fluidity of the molten pool needs to be controlled during welding.

[0069] 3. Overhead fillet welding: Used for the connection of the bottom structure of the hull. The weld is in an upward view position, and it is necessary to prevent molten droplets from falling during welding.

[0070] 4. Butt welding: Used for butt connection of the main body of the ship hull, where two steel plates are butt-jointed, and the welding position is the flat welding position.

[0071] 5. Butt welding: Used for butt joints of vertical steel plates, the weld is vertical, and the welding parameters need to be specially adjusted.

[0072] 6. Butt welding overhead: Used for butt joints of bottom steel plates. The weld is in an overhead position, making welding more difficult.

[0073] Specifically, current and voltage measuring devices are installed at the output end of the CO2 gas shielded welding machine cable in the production workshop. The current measuring device uses a Hall current sensor with a measurement range of 0-600A and an accuracy of ±1%. The voltage measuring device uses a voltage transformer with a measurement range of 0-50V and an accuracy of ±0.5%. A welding wire measuring device is installed on the wire feeding device, using an optical encoder to measure the wire output speed with a measurement range of 0-20m / min and an accuracy of ±1%. A vortex flow meter is installed between the CO2 delivery pipeline and the welding torch, with a measurement range of 5-30L / min and an accuracy of ±1.5%.

[0074] In some examples of the present invention, step S2 includes:

[0075] Step S2.1: Collect power consumption data.

[0076] By installing current and voltage measuring devices at the output end of the welding machine cable, the current during the welding process is measured. ),Voltage( ),time( ) and correction factor ( ), combined with the welding machine's correction factor ( According to the formula Calculate the electrical energy consumption during the welding process ( ).

[0077] In some examples of the present invention, step S2 includes:

[0078] Step S2.2: Welding wire consumption data collection.

[0079] The wire feeding speed is monitored by a wire measuring device installed on the wire feeding device. ), combined with welding time ( ), cross-sectional area of ​​welding wire ( ) and the density of the welding wire ( According to the formula Calculate the weight of welding wire consumed during the welding process ( ).

[0080] In some examples of the present invention, step S2 includes:

[0081] Step S2.3: Collect carbon dioxide gas consumption data.

[0082] The flow rate of carbon dioxide gas was measured by installing a flow meter between the carbon dioxide delivery pipeline and the welding torch. ), combined with welding time ( ) and flow meter cross-sectional area ( According to the formula Calculate the volume of carbon dioxide gas consumed during the welding process ( ).

[0083] In some examples of the present invention, step S2 includes:

[0084] Step S2.4: Record the weld length.

[0085] While collecting the above data, the weld length for each welding operation was recorded. ).

[0086] Specifically, experimental data were collected for each of the six welding methods mentioned above. Taking fillet weld as an example, a 12mm thick low-carbon steel plate was selected as the base material, the welding wire diameter was 1.2mm, the welding wire type was H08Mn2SiA, the shielding gas was 99.9% pure carbon dioxide gas, and the gas flow rate was set to 15L / min. The welding process parameters were set as follows: current 280A, voltage 29V, and welding speed 35cm / min.

[0087] Welding was initiated, and the current changes during the welding process were monitored in real time using a current measuring device, with an average current value of 285A recorded. The voltage changes during the welding process were also monitored in real time using a voltage measuring device, with an average voltage value of 28.5V recorded. The welding time was recorded as 180 seconds using a timer. Simultaneously, the wire feed rate was monitored using a wire measuring device, with an average feed rate of 9.5 m / min recorded. The carbon dioxide gas flow rate was measured using a gas flow meter, with an average gas flow rate of 15.2 L / min recorded. After welding, the weld length was measured to be 105 cm.

[0088] Considering the service life and resistance characteristics of the welding machine, which has been in use for 5 years, its correction factor was determined after testing. A value of 1.05 indicates that the energy loss due to the internal resistance of the welding machine is approximately 5%.

[0089] Following the above method, multiple repeated experiments were conducted on corner joint flat welding, collecting a total of 10 sets of valid data. Simultaneously, the same number of experiments were also conducted on corner joint vertical welding, corner joint overhead welding, butt joint flat welding, butt joint vertical welding, and butt joint overhead welding, with 10 sets of valid data collected for each welding method, for a total of 60 sets of experimental data.

[0090] In some examples of the present invention, in step S3, the process of step S2 is repeated to obtain multiple sets of energy and material consumption data and corresponding weld lengths under different welding methods. The obtained electrical energy consumption ( ), weight of welding wire consumed ( ) and the volume of carbon dioxide gas ( Take the average value for each, and divide by the corresponding weld length. The electrical energy, welding wire, and carbon dioxide gas consumed per unit length of weld under different joint types and welding positions were obtained.

[0091] Specifically, the 60 sets of collected data were processed and calculated. Taking fillet welds as an example, the calculation process is as follows:

[0092] Electricity consumption calculation: E=εUIt=1.05×28.5V×285A×180s=1.05×28.5×285×180÷3600=427.3Wh

[0093] Calculation of welding wire consumption: The welding wire diameter is 1.2mm, and the cross-sectional area S = π × (1.2 / 2)² = 1.131mm² = 1.131 × 10⁻⁶. -6 m², welding wire density ρ is 7.85 g / cm³ = 7850 kg / m³. m = νtSρ = (9.5 / 60) × 180 × 1.131 × 10 -6 ×7850=0.253kg=253g

[0094] Carbon dioxide gas consumption calculation: V=νtS, gas flow meter inner diameter is 10mm, cross-sectional area S=π×(10 / 2)²=78.54mm²=78.54×10 -6 m². V=(15.2 / 60)×180×78.54×10 -6 =0.00358m³=3.58L

[0095] The above calculations were performed on 10 sets of data for corner fillet welds, and then the average value was taken to obtain the average consumption per unit length of weld for corner fillet welds:

[0096] Energy consumption per unit length: 427.3Wh ÷ 1.05m = 407Wh / m

[0097] Welding wire consumption per unit length: 253g ÷ 1.05m = 241g / m

[0098] Gas consumption per unit length: 3.58L ÷ 1.05m = 3.41L / m

[0099] Using the same method, the weld consumption per unit length was calculated for the other five welding methods, and the results are as follows:

[0100] • Fillet joint vertical welding: Energy consumption per unit length 485Wh / m, welding wire consumption per unit length 287g / m, gas consumption per unit length 4.06L / m

[0101] • Overhead fillet welding: Energy consumption per unit length 523Wh / m, welding wire consumption per unit length 309g / m, gas consumption per unit length 4.38L / m

[0102] • Butt welding: Energy consumption per unit length is 392Wh / m, welding wire consumption per unit length is 232g / m, and gas consumption per unit length is 3.28L / m.

[0103] • Butt welding: Energy consumption per unit length is 468Wh / m, welding wire consumption per unit length is 277g / m, and gas consumption per unit length is 3.92L / m.

[0104] • Butt welding (overhead): Energy consumption per unit length: 511Wh / m; Welding wire consumption per unit length: 302g / m; Gas consumption per unit length: 4.28L / m

[0105] In some examples of the present invention, in step S4, the carbon emissions per unit length of weld under different welding methods are calculated based on the composition of the welding materials used for welding, the power composition of the power grid area, and the concentration of carbon dioxide shielding gas. ), carbon emissions ( The formula for calculating ) is:

[0106] , ,

[0107] in, Carbon emissions per unit length of weld. This refers to the carbon emissions corresponding to electricity. This represents the carbon emissions corresponding to the welding wire. This represents the carbon emissions corresponding to carbon dioxide gas. This refers to the weld length.

[0108] Specifically, the corresponding carbon emission factor is selected based on the composition of the welding materials used, the power composition of the power grid area, and the concentration of carbon dioxide shielding gas. The average carbon emission factor of the power grid in the area where the company is located is 0.581 kgCO2 / kWh, the carbon emission factor of the welding wire H08Mn2SiA is 2.5 kgCO2 / kg welding wire, the carbon emission factor of the carbon dioxide shielding gas is 1.96 kgCO2 / kgCO2, and the density of carbon dioxide gas is 1.977 kg / m³. Therefore, the gaseous carbon emission factor is 1.96 × 1.977 = 3.87 kgCO2 / m³.

[0109] Taking fillet weld as an example, calculate the carbon emissions per unit length of weld:

[0110] Carbon emissions from electricity: 0.407 kWh / m³ × 0.581 kg CO₂ / kWh = 0.236 kg CO₂ / m³

[0111] Carbon emissions from welding wire: 0.241 kg / m × 2.5 kg CO2 / kg = 0.603 kg CO2 / m

[0112] Gaseous carbon emissions: 0.00341 m³ / m × 3.87 kg CO₂ / m³ = 0.013 kg CO₂ / m³

[0113] Total carbon emissions per unit length of weld:

[0114] E(CO2)=(0.236+0.603+0.013)kgCO2 / m=0.852kgCO2 / m

[0115] Using the same method, the carbon emissions per unit length of weld were calculated for the other five welding methods:

[0116] • Fillet weld: E(CO2) = (0.485 × 0.581 + 0.287 × 2.5 + 0.00406 × 3.87) = 1.016 kg CO2 / m

[0117] • Overhead fillet welding: E(CO2) = (0.523 × 0.581 + 0.309 × 2.5 + 0.00438 × 3.87) = 1.096 kg CO2 / m

[0118] • Butt weld: E(CO2) = (0.392 × 0.581 + 0.232 × 2.5 + 0.00328 × 3.87) = 0.819 kg CO2 / m

[0119] • Butt welding: E(CO2) = (0.468 × 0.581 + 0.277 × 2.5 + 0.00392 × 3.87) = 0.980 kg CO2 / m

[0120] • Butt welding (overhead): E(CO2) = (0.511 × 0.581 + 0.302 × 2.5 + 0.00428 × 3.87) = 1.072 kg CO2 / m

[0121] In some examples of the present invention, in step S5, the carbon emissions per unit length of weld under six different welding methods obtained in step S4 are ( ) and the length of each CO2 gas shielded weld in the product design ( Multiply by the carbon emissions of all welds, and then add up the carbon emissions of all welds to obtain the total carbon dioxide emissions directly and indirectly caused by the gas shielded welding operation. The calculation formula is as follows:

[0122] .

[0123] Specifically, the welding drawings for the ship sections show that the lengths of various welds are as follows: fillet flat welds: 85m; fillet vertical welds: 62m; fillet overhead welds: 28m; butt flat welds: 73m; butt vertical welds: 45m; and butt overhead welds: 31m.

[0124] Multiply the carbon emissions per unit length of weld by the corresponding weld length, and then sum the carbon emissions of all welds:

[0125] Corner joint flat weld:

[0126] Fillet joint vertical welding: 1.016 kg CO2 / m × 62 m = 62.99 kg CO2

[0127] Overhead fillet welding: 1.096 kg CO2 / m × 28 m = 30.69 kg CO2

[0128] Butt welding: 0.819 kg CO2 / m × 73 m = 59.79 kg CO2

[0129] Vertical butt welding: 0.980 kg CO2 / m × 45 m = 44.10 kg CO2

[0130] Overhead butt welding: 1.072 kg CO2 / m × 31 m = 33.23 kg CO2

[0131] Total carbon emissions from ship sections:

[0132]

[0133] Based on the above calculations, the total carbon emissions generated by the carbon dioxide gas shielded welding operation of this ship section are 303.22 kg CO2.

[0134] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A method for calculating carbon emissions from welding operations during the shipbuilding phase, considering energy and material consumption, characterized in that... Includes the following steps: Step S1: Welding operation classification and data acquisition preparation, Based on the needs of shipbuilding, CO2 gas shielded welding operations are classified and data acquisition equipment is installed. Step S2: Welding process data acquisition. Experimental data were collected for different welding methods to obtain data on energy and material consumption during the welding process; Step S3: Calculate the data consumption per unit length of weld. The collected data is processed to calculate the energy and material consumption per unit length of weld under different welding methods; Step S4: Calculation of carbon emissions per unit length of weld. Based on the energy and material consumption per unit length of weld and the corresponding carbon emission factor, calculate the carbon emission per unit length of weld under different welding methods. Step S5: Calculate total carbon emissions. Calculate the total carbon emissions from CO2 gas shielded welding operations based on the length of each weld seam in the product design.

2. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 1, is characterized in that... In step S1, the carbon dioxide gas shielded welding operation in the shipbuilding process is divided into six welding methods according to the joint type and welding position: fillet flat welding, fillet vertical welding, fillet overhead welding, butt flat welding, butt vertical welding, and butt overhead welding.

3. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 1, is characterized in that... Data acquisition equipment includes: Install current measuring equipment and voltage measuring equipment at the output end of the carbon dioxide gas shielded welding machine cable in the production workshop; Install welding wire measuring equipment on the wire feeding device; Install an airflow meter between the carbon dioxide delivery pipeline and the welding torch. The data acquisition device is used to acquire data on power consumption, welding wire consumption, and carbon dioxide gas consumption during the welding process.

4. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 3, is characterized in that... Step S2 includes: Step S2.1: Collect power consumption data. By installing current and voltage measuring devices at the output end of the welding machine cable, the current during the welding process is measured. ),Voltage( ),time( ) and correction factor ( ), combined with the welding machine's correction factor ( According to the formula Calculate the electrical energy consumption during the welding process ( ).

5. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 4, is characterized in that... Step S2 includes: Step S2.2: Welding wire consumption data collection. The wire feeding speed is monitored by a wire measuring device installed on the wire feeding device. ), combined with welding time ( ), cross-sectional area of ​​welding wire ( ) and the density of the welding wire ( According to the formula Calculate the weight of welding wire consumed during the welding process ( ).

6. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 5, is characterized in that... Step S2 includes: Step S2.3: Collect carbon dioxide gas consumption data. The flow rate of carbon dioxide gas was measured by installing a flow meter between the carbon dioxide delivery pipeline and the welding torch. ), combined with welding time ( ) and flow meter cross-sectional area ( According to the formula Calculate the volume of carbon dioxide gas consumed during the welding process ( ).

7. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 6, is characterized in that... Step S2 includes: Step S2.4: Record the weld length. While collecting the above data, the weld length for each welding operation was recorded. ).

8. The method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 7, is characterized in that... In step S3, the process of step S2 is repeated to obtain multiple sets of energy and material consumption data and corresponding weld lengths under different welding methods. The obtained electrical energy consumption ( ), weight of welding wire consumed ( ) and the volume of carbon dioxide gas ( Take the average value for each, and divide by the corresponding weld length. The electrical energy, welding wire, and carbon dioxide gas consumed per unit length of weld under different joint types and welding positions were obtained.

9. A method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 8, is characterized in that... In step S4, the carbon emissions per unit length of weld are calculated based on the composition of the welding materials used in welding, the power composition of the power grid area, and the concentration of carbon dioxide shielding gas under different welding methods. ), carbon emissions ( The formula for calculating ) is: , ， in, This refers to the carbon emissions per unit length of weld. This refers to the carbon emissions corresponding to electricity. This represents the carbon emissions corresponding to the welding wire. This represents the carbon emissions corresponding to carbon dioxide gas. This refers to the weld length.

10. A method for calculating carbon emissions from welding operations during shipbuilding considering energy and material consumption, as described in claim 9, is characterized in that... In step S5, the carbon emissions per unit length of weld under the six different welding methods obtained in step S4 are calculated. ) and the length of each CO2 gas shielded weld in the product design ( Multiply by the carbon emissions of all welds, and then add up the carbon emissions of all welds to obtain the total carbon dioxide emissions directly and indirectly caused by the gas shielded welding operation. The calculation formula is as follows: 。

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