A construction machine vibration roller welding system and welding method

Abstract

The present application relates to a kind of engineering machinery vibration roller welding system and welding method, belong to welding equipment technical field, including plasma arc welding system (i.e. controlled pulse perforation plasma arc welding), carbon dioxide gas shielded welding (abbreviation two protection welding) system, visual detection system, electric signal acquisition and control system, PLC control cabinet, roller device;Controlled pulse perforation plasma arc welding, by adjusting pulse parameter, can guarantee the high penetration of arc under the premise, effectively reduce heat input, improve welding speed, guarantee welding quality.Inert gas used in carbon dioxide gas shielded welding process helps to reduce the generation of slag and pore, improve welding quality, at the same time, compared with other welding methods, two protection welding protective gas is easy to obtain, can reduce production cost.

Description

Technical Field

[0001] This invention relates to a welding system and welding method for vibrating rollers in engineering machinery, belonging to the technical field of welding equipment. Background Technology

[0002] With the development of society, pipeline transportation has become the fifth largest transportation industry. Pipeline transportation refers to a mode of transportation that uses pipelines as the means of transport. Based on the distance traveled, it can be divided into long-distance pipeline transportation and short-distance pipeline transportation. Long-distance pipeline transportation has been widely used in fields such as oil and gas, while short-distance pipeline transportation often plays an important role in fields such as ores and building materials. As of August 2015, the total length of onshore oil and gas pipelines in China reached 120,000 kilometers. With the continuous increase in social demand for pipeline transportation, how to efficiently and effectively produce transportation pipelines has become an urgent problem to be solved.

[0003] For pipes manufactured with medium and heavy plates, traditional welding methods such as submerged arc welding (SAW) offer high welding efficiency, but the pre-weld preparation process is complex, and post-weld heat treatment is required due to the excessive heat input, resulting in high time and labor costs. While tungsten inert gas (TIG) welding produces high-quality welds, it requires beveling for thick plates and multi-layer, multi-pass welding, leading to low efficiency. High-energy beam welding, such as laser welding and electron beam welding, suffers from poor weld joint quality due to excessively high energy density and heat input. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for welding vibrating rollers for engineering machinery. This method effectively solves the problems of low production efficiency and poor joint quality in the welding process of medium and heavy plate pipes.

[0005] Controlled pulsed perforation arc welding, by adjusting pulse parameters, can effectively reduce heat input, increase welding speed, and ensure weld quality while maintaining high arc penetration. The inert gas used in CO2 gas shielded welding helps reduce slag and porosity, improving weld quality. Furthermore, compared to other welding methods, CO2 gas shielded welding has readily available shielding gas, reducing production costs.

[0006] The technical solution of the present invention is as follows:

[0007] A vibrating roller welding system for engineering machinery includes a plasma arc welding system (i.e., controlled pulsed through-hole plasma arc welding), a carbon dioxide gas shielded welding system (referred to as MIG welding), a vision inspection system, an electrical signal acquisition and control system, a PLC control cabinet, and a roller device.

[0008] The plasma arc welding system includes a plasma arc welding power source, a plasma arc welding torch, a water chiller, and an argon cylinder; the PLC control cabinet is connected to the plasma arc welding power source and the plasma arc welding torch respectively;

[0009] The carbon dioxide gas shielded welding system includes a MIG welding power source, an MIG welding torch, a wire feeder, and a carbon dioxide cylinder; the wire feeder is used for feeding wire during the weld filling process.

[0010] The visual inspection system includes a connected CCD camera and an industrial control computer, which monitor and acquire weld images in real time during the welding process; the CCD camera is located on the side of the plasma arc welding torch, and the industrial control computer is used to acquire image data from the CCD camera.

[0011] The aforementioned electrical signal acquisition and control system includes an electromagnetic relay, a Hall current sensor, a tail flame voltage sensor, and a data acquisition card. Signal acquisition refers to the input of analog signals, which is used to collect and store welding current and welding voltage in real time during the welding process.

[0012] The PLC control cabinet includes a programmable logic controller, an analog expansion module, a control display screen, and motion, current, and wire feeding control programs, which are used to control the arc starting and ending of the welding torch, three-dimensional mechanical motion, wire feeding speed, and roller speed.

[0013] The roller assembly includes a support base and a transmission device. The tubular weldment is placed on the support base, and the transmission device is used to rotate the tubular weldment.

[0014] Preferably, the electrical signal acquisition and control system includes a Siemens Sirius 3RT102 electromagnetic relay, an ACS712ELC-30A Hall current sensor, a Honeywell HVC 500 exhaust voltage sensor, and an ADAM-6100 data acquisition card.

[0015] Preferably, the plasma arc welding system and the MIG / MAG welding system further include a three-dimensional motion system, which is used to control the movement of the welding torch in the X, Y, and Z directions. By moving the torch in the X, Y, and Z directions, it can adapt to different welding scenarios and welding requirements.

[0016] Preferably, the surface of the support base is arc-shaped, and the transmission device includes 8 small wheels. Four small wheels are set at each end of the tubular weldment, and four at the front and four at the back to stably support the welded pipe. Each small wheel is connected to the motor through a connecting rod in the middle. The motor drives the small wheel to rotate, thereby driving the welded pipe to rotate.

[0017] In a further optimized design, the eight small wheels move independently. The front and rear small wheels can move relative to each other, allowing for fine-tuning and positioning correction before welding to ensure that the welded pipe axis is parallel to the small wheel axis. This prevents the welded pipe from rotating and shifting during welding, thus improving the system's efficiency and reliability.

[0018] A method for welding vibrating rollers for engineering machinery includes the following steps:

[0019] (1) The workpiece to be welded is assembled by opening a Y-shaped bevel and placed on the support base.

[0020] (2) The plasma welding torch extends into the inside of the pipe workpiece and is located below the inside of the workpiece. The welding torch is perpendicular to the workpiece and vertically downward. The MIG welding torch is located above the outside of the pipe workpiece. The welding torch is also perpendicular to the workpiece and vertically downward.

[0021] (3) Before welding begins, call the three-dimensional motion, current, wire feeding and winding, arc starting and ending programs in the PLC control cabinet, and set the corresponding welding parameters in the PLC control system through the control display screen.

[0022] (4) Using DC welding, the advantages of plasma arc welding's large penetration and low heat input are utilized to perform root pass welding on the blunt edge of the Y-shaped groove, followed by MIG welding to fill the groove from the outside.

[0023] Preferably, in step (1), the two pipes to be welded are each beveled, and the bevels of the two pipes form a Y-shaped bevel. They are then assembled together by spot welding before welding.

[0024] Preferably, in step (1), the bevel retains a 6-10mm blunt edge, the angle between the bevel inclined surface and the vertical surface is 30°, and before welding, the oxides at the bevel and the welding position need to be ground off with a grinding wheel and the oil, dust and other impurities should be wiped off with alcohol to prevent them from affecting the quality of the weld.

[0025] Preferably, in step (2), the copper nozzle of the plasma welding gun is 7-8 mm away from the surface of the workpiece; the MIG welding wire extends 13-15 mm and enters the center of the bevel, and starts an arc 2-3 mm away from the workpiece.

[0026] Preferably, in step (3), the plasma arc welding speed is 1-2 mm / s, the copper nozzle diameter is 3.2 mm, the tungsten electrode indentation is 1.2-3.0 mm, the tungsten electrode diameter is 4 mm, the DC pulse current base value is 180-240 A, the peak current is 200-260 A, the ion gas flow rate is 3-4 L / min, and the shielding gas flow rate is 10-15 L / min; the welding speed is the linear speed of the roller rotation.

[0027] Preferably, in step (3), the welding speed of the MIG welding is 1-2 mm / s, the welding current is 130A-180A, the voltage is 20-25V, the carbon dioxide flow rate is 10-15L / min, the welding wire diameter is 1.2mm, and the wire feeding speed is 800-1000mm / min; the welding speed is the linear speed of the roller rotation.

[0028] Preferably, in step (4), the plasma welding torch starts arc welding at point A of the workpiece to begin the root pass welding. At the same time, the roller rotates to drive the workpiece to rotate. When the workpiece rotates 180 degrees and point A is below the MIG welding torch, the MIG welding torch starts arc welding. When the roller rotates 360 degrees and point A is below the plasma welding torch again, the plasma welding torch stops welding, and the roller continues to rotate until the MIG welding torch finishes welding.

[0029] This solution utilizes two welding guns at different positions and with different welding methods. This welding method can improve production efficiency and welding quality, reduce production steps and costs, and expand application scenarios. For weld formation, it can optimize the weld shape, minimize heat input, and reduce the heat-affected zone. For internal structure, it can refine the grain structure to achieve uniformity and reduce the generation of defects. In addition, the simultaneous application of two welding methods greatly broadens the welding process window and effectively solves the shortcomings of narrow welding parameter window and small adjustability margin. This allows the welding method to flexibly meet the needs of workpieces of various sizes and different welding scenarios.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. This invention combines plasma arc welding with carbon dioxide gas shielded welding, which leverages the advantages of plasma arc welding, such as large penetration depth, low heat input, and high efficiency, while also leveraging the advantages of carbon dioxide gas shielded welding, such as flexible welding, high weld quality, and low cost. This optimizes the production process, improves equipment utilization, and reduces scrap rate, which is of great significance for improving production efficiency, shortening delivery cycle, improving product quality, and reducing production costs.

[0032] 2. The welding method of the present invention utilizes a combination of two welding methods. After plasma arc welding is completed, the rollers rotate the welded portion of the pipe workpiece to the MIG / MAG welding position. At this time, the workpiece can still maintain a temperature of 200-300°C, which is equivalent to preheating the workpiece before welding. This plays an important role in reducing welding stress, increasing the ductility of the weld metal, and reducing welding deformation. At the same time, MIG / MAG welding is performed on the weld after plasma arc welding, which is equivalent to post-weld heat treatment. This is of great significance for eliminating hydrogen embrittlement, improving grain structure, adjusting microstructure properties, and improving the strength and toughness of the weld joint.

[0033] 3. This invention employs an automated welding method with a fixed welding torch and rollers controlling workpiece movement. This enables a continuous and efficient welding process without manual intervention, improving production efficiency. It ensures the consistency and stability of the welding process, unaffected by the welder's skill level, reducing the incidence of welding defects and improving welding quality and product consistency. It can be programmed and adjusted according to different welding requirements and workpiece sizes, offering high flexibility and adaptability. It is suitable for various welding processes and materials, meeting the production needs of different workpieces. The control system has data recording and traceability functions, recording welding process parameters and results, which is helpful for welding quality control and production management.

[0034] 4. The welding method of the present invention is simple to design and operate, convenient to use, and significantly improves welding quality and production efficiency. It has good economic benefits and social value, and has great application prospects in the welding production of medium and heavy plate pipes. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the welding method and equipment assembly of the present invention;

[0036] Figure 2 This is a schematic diagram of the bevel of the present invention;

[0037] Figure 1 In the diagram: 01 is the plasma arc welding torch, 02 is the MIG / MAG welding torch, 03 is the roller device, 04 is the industrial CCD camera, 05 is the industrial computer, 06 is the MIG / MAG welding power supply, 07 is the carbon dioxide cylinder, 08 is the wire feeder, 09 is the PLC control cabinet, 10 is the argon cylinder, 11 is the water chiller, and 12 is the plasma arc welding power supply.

[0038] Figure 3 This is a schematic diagram of plasma undercoating.

[0039] Figure 4 This is a schematic diagram of MIG welding.

[0040] Figure 5 This is a schematic diagram of the welding process. Detailed Implementation

[0041] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0042] Example 1:

[0043] like Figure 1 As shown, this embodiment provides a vibrating roller welding system for engineering machinery, including a plasma arc welding system (i.e., controlled pulse perforation plasma arc welding), a carbon dioxide gas shielded welding system (referred to as MIG welding), a vision inspection system, an electrical signal acquisition and control system, a PLC control cabinet, and a roller device.

[0044] The plasma arc welding system includes a plasma arc welding power source, a plasma arc welding torch, a water chiller, and an argon cylinder; the PLC control cabinet is connected to the plasma arc welding power source and the plasma arc welding torch respectively.

[0045] The carbon dioxide gas shielded welding system includes a MIG welding power source, an MIG welding torch, a wire feeder, and a carbon dioxide cylinder; the wire feeder is used to feed wire during the weld filling process.

[0046] Plasma arc welding systems and MIG / MAG welding systems also include a three-dimensional motion system. The three-dimensional motion system is used to control the movement of the welding torch in the XYZ directions. By moving the torch in the XYZ directions, it can adapt to different welding scenarios and welding requirements.

[0047] The visual inspection system includes a connected CCD camera and an industrial control computer, which monitors and acquires weld images in real time during the welding process; the CCD camera is located on the side of the plasma arc welding torch, and the industrial control computer is used to acquire image data from the CCD camera.

[0048] The aforementioned electrical signal acquisition and control system includes a Siemens Sirius 3RT102 electromagnetic relay, an ACS712ELC-30A Hall current sensor, a Honeywell HVC 500 tail flame voltage sensor, and an ADAM-6100 data acquisition card. Signal acquisition refers to the input of analog signals, which is used to collect and store welding current and welding voltage in real time during the welding process.

[0049] The PLC control cabinet includes a programmable logic controller, an analog expansion module, a control display screen, and motion, current, and wire feeding control programs, used to control the arc ignition and termination of the welding torch, three-dimensional mechanical motion, wire feeding speed, and roller speed.

[0050] The roller assembly includes a support base and a transmission device. The tubular weldment is placed on the support base, and the transmission device is used to rotate the tubular weldment.

[0051] The support base has an arc-shaped surface. The transmission device includes eight small wheels, which move independently. Four small wheels are set at each end of the tubular weldment, and four at the front and four at the back to stably support the welded pipe. Each small wheel is connected to the motor through a connecting rod in the middle. The motor drives the small wheel to rotate, which in turn drives the welded pipe to rotate.

[0052] The welding material selected in this embodiment is 304 austenitic stainless steel with a thickness of 20mm.

[0053] Example 2:

[0054] A welding method using the engineering machinery vibrating roller welding system described in Example 1 includes the following steps:

[0055] (1) For the 20mm thick workpiece to be welded, a Y-shaped bevel is adopted. The two pipes to be welded each have their own bevels, forming a Y-shaped bevel. Before welding, they are assembled together by spot welding. Figure 2 As shown, the bevel retains a 6mm blunt edge, and the angle between the bevel's inclined surface and the vertical surface is 30°. Before welding, the oxides at the bevel and welding position must be ground off with a grinding wheel, and oil, dust, and other impurities must be wiped away with alcohol to prevent affecting the weld quality. The workpieces to be welded are then butt-assembled and placed on the roller frame.

[0056] (2) The plasma welding gun extends from inside the pipe workpiece and is located below the inside of the workpiece. The welding gun is perpendicular to the workpiece and vertically downward. The copper nozzle of the plasma welding gun is 8mm away from the surface of the workpiece. The MIG welding gun is located above the outside of the pipe workpiece. The welding gun is also perpendicular to the workpiece and vertically downward. The welding wire extends 15mm and enters the center of the bevel. The arc is started 3mm away from the workpiece.

[0057] (3) Before welding begins, call the three-dimensional motion, current, wire feeding and rewinding, and arc starting and ending programs in the control system. Set the corresponding welding parameters in the PLC control system through the control display screen. The plasma arc welding speed is 2 mm / s, the copper nozzle diameter is 3.2 mm, the tungsten electrode inward shrinkage is 1.2 mm, the tungsten electrode diameter is 4 mm, the DC pulse current base value is 180 A, the peak current is 200 A, the ion gas flow rate is 3 L / min, and the shielding gas flow rate is 15 L / min. The MIG welding speed is 2 mm / s, the welding current is 150 A, the voltage is 22 V, the carbon dioxide gas flow rate is 10 L / min, the welding wire diameter is 1.2 mm, and the wire feeding speed is 850 mm / min.

[0058] (4) Using DC welding, the advantages of plasma arc welding's large penetration and low heat input are utilized to perform root pass welding on the blunt edge of the Y-shaped groove, followed by MIG welding to fill the groove from the outside.

[0059] like Figure 3-5 As shown, the plasma welding torch initiates the root pass welding at point A on the workpiece. Simultaneously, the roller rotates, causing the workpiece to rotate. When the workpiece has rotated 180 degrees and point A is below the MIG / MAG welding torch, the MIG / MAG welding torch initiates the arc welding. When the roller rotates 360 degrees and point A is once again below the plasma welding torch, the plasma welding torch stops welding, while the roller continues to rotate until the MIG / MAG welding is complete. The workpiece A is the starting position for the plasma root pass welding, and the arrow indicates the welding direction during the process. When A rotates to be below the MIG / MAG torch, it becomes the starting point for the MIG / MAG weld, at which point both torches weld simultaneously.

[0060] This embodiment can achieve butt welding of 20mm thick 304 austenitic stainless steel pipes. By utilizing the advantages of high energy density and low heat input of pulsed current in plasma arc welding, the welding time is greatly shortened and the welding production efficiency is improved. At the same time, by utilizing the advantages of high quality and low cost of MIG welding, welds with uniform microstructure distribution, low porosity, low residual stress and beautiful surface are obtained.

[0061] Tensile tests were conducted using the method of Example 2, and the experimental data are as follows. Table 1 shows the tensile, bending, and -20℃ impact toughness tests of the workpieces welded by the welding method of the present invention, as well as those welded by plasma arc welding and MIG welding alone. As can be seen from the table, under all three welding methods, the fracture location of the tested workpieces occurred in the base material. Among them, the yield strength, tensile strength, and 20℃ impact toughness of the plasma arc welded workpieces were 276R. p0.2 / MPa, 448R m / MPa, 129J / cm 2 The yield strength, tensile strength, and impact toughness at 20℃ of the MIG / MAG weld are 280R. p0.2 / MPa, 451R m / MPa、131J / cm 2 The welded joint obtained by the welding method of this invention can achieve a yield strength, tensile strength, and impact toughness at 20°C of 302R. p0.2 / MPa, 460R m / MPa、144J / cm 2 Compared to plasma arc welding and MIG welding, the yield strength is increased by 9.42% and 7.86%, the tensile strength is increased by 2.68% and 2.00%, and the impact toughness at 20℃ is increased by 11.63% and 9.92%.

[0062] Table 1 Tensile test data

[0063] Plasma arc welding 276 448 129 parent material MIG welding 280 451 131 parent material Combination welding 302 460 144 parent material

[0064] Example 3:

[0065] A method for welding vibrating rollers for engineering machinery is described in the basic method of Example 2, except that in step (1), the bevel retains an 8mm blunt edge; in step (2), the copper nozzle of the plasma welding gun is 7mm away from the workpiece surface; the MIG welding wire extends 13mm and enters the center of the bevel, and the arc is started 2mm away from the workpiece; in step (3), the plasma arc welding speed is 1mm / s, the copper nozzle diameter is 3.2mm, the tungsten electrode indentation is 3.0mm, the tungsten electrode diameter is 4mm, the DC pulse current base value is 200A, the peak current is 220A, the ion gas flow rate is 3L / min, and the shielding gas flow rate is 10L / min. The MIG welding speed is 1mm / s, the welding current is 130A, the voltage is 20V, the carbon dioxide gas flow rate is 10L / min, the welding wire diameter is 1.2mm, and the wire feeding speed is 800mm / min.

[0066] Example 4:

[0067] A method for welding vibrating rollers for engineering machinery is described in the basic method of Example 2, except that in step (1), a 10mm blunt edge is retained on the bevel. In step (3), the ion arc welding speed is 1.5mm / s, the copper nozzle diameter is 3.2mm, the tungsten electrode indentation is 2.0mm, the tungsten electrode diameter is 4mm, the DC pulse current base value is 220A, the peak current is 240A, the ion gas flow rate is 4L / min, and the shielding gas flow rate is 15L / min. The MIG welding speed is 1.5mm / s, the welding current is 180A, the voltage is 25V, the carbon dioxide gas flow rate is 15L / min, the welding wire diameter is 1.2mm, and the wire feeding speed is 1000mm / min.

Claims

1. A welding method for a vibrating roller welding system for engineering machinery, characterized in that, The welding system includes a plasma arc welding system, a MIG / MAG welding system, a vision inspection system, an electrical signal acquisition and control system, a PLC control cabinet, and a roller device; The plasma arc welding system includes a plasma arc welding power source, a plasma arc welding torch, a water chiller, and an argon cylinder; the PLC control cabinet is connected to the plasma arc welding power source and the plasma arc welding torch respectively; The MIG / MAG welding system includes an MIG / MAG welding power source, an MIG / MAG welding torch, a wire feeder, and a carbon dioxide cylinder. The visual inspection system includes a connected CCD camera and an industrial control computer. The CCD camera is located on the side of the plasma arc welding torch, and the industrial control computer is used to acquire image data from the CCD camera. The aforementioned electrical signal acquisition and control system includes an electromagnetic relay, a Hall current sensor, a tail flame voltage sensor, and a data acquisition card. The signal acquisition is an analog signal input, used to collect and store welding current and welding voltage in real time during the welding process. The PLC control cabinet includes a programmable logic controller, an analog expansion module, a control display screen, and motion, current, and wire feeding control programs, which are used to control the arc starting and ending of the welding torch, three-dimensional mechanical motion, wire feeding speed, and roller speed. The roller device includes a support base and a transmission device. The pipe workpiece is placed on the support base, and the transmission device is used to rotate the pipe workpiece. The method includes the following steps: (1) The pipe workpiece is assembled by opening a Y-shaped bevel and placed on the support base; (2) The plasma arc welding gun extends into the inside of the pipe workpiece and is located below the inside of the pipe workpiece. The plasma arc welding gun is perpendicular to the pipe workpiece and vertically downward. The MIG welding torch is positioned above and outside the pipe workpiece, and its posture is also perpendicular to the pipe workpiece, pointing vertically downwards and above the outside of the pipe workpiece. (3) Before welding begins, call the three-dimensional motion, current, wire feeding and winding, arc starting and ending programs in the PLC control cabinet, and set the corresponding welding parameters in the PLC control cabinet through the control display screen; (4) Using DC welding, plasma arc welding is used to perform root pass welding on the blunt edge of the Y-shaped groove, and then MIG welding is used to fill the groove from the outside. The plasma arc welding torch initiates the root pass welding at point A on the pipe workpiece. At the same time, the roller rotates, causing the pipe workpiece to rotate. When the pipe workpiece has rotated 180 degrees and point A is below the MIG welding torch, the MIG welding torch initiates the arc welding. When the roller rotates 360 degrees and point A is below the plasma arc welding torch again, the plasma arc welding torch stops welding, and the roller continues to rotate until the MIG welding torch finishes welding.

2. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, The plasma arc welding system and the MIG welding system also include a three-dimensional motion system, which is used to control the movement of the welding torch in the XYZ directions.

3. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, The surface of the support base is arc-shaped, and the transmission device includes 8 small wheels. Four small wheels are set at each end of the tubular welded part, and each small wheel is connected to the motor through a connecting rod in the middle; the movement of the 8 small wheels is independent of each other.

4. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, In step (1), the two pipe workpieces are each beveled, and the bevels of the two pipe workpieces form a Y-shaped bevel. They are then assembled together by spot welding before welding.

5. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, In step (1), the bevel retains a 6-10mm blunt edge, and the angle between the bevel inclined surface and the vertical surface is 30°. Before welding, the oxides at the bevel and the welding position are first ground off with a grinding wheel, and the oil stains, dust and impurities are wiped off with alcohol.

6. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, In step (2), the copper nozzle of the plasma arc welding gun is 7-8 mm away from the surface of the pipe workpiece; the MIG welding wire extends 13-15 mm and enters the center of the bevel, and starts the arc 2-3 mm away from the workpiece.

7. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, In step (3), the plasma arc welding speed is 1~2 mm / s, the copper nozzle diameter is 3.2 mm, the tungsten electrode indentation is 1.2~3.0 mm, the tungsten electrode diameter is 4 mm, the DC pulse current base value is 180~240 A, the peak current is 200~260 A, the ion gas flow rate is 3~4 L / min, and the shielding gas flow rate is 10~15 L / min; the welding speed is the linear speed of the roller rotation.

8. The welding method for the engineering machinery vibrating roller welding system according to claim 1, characterized in that, In step (3), the welding speed of the MIG welding is 1~2 mm / s, the welding current is 130A~180A, the voltage is 20~25V, the carbon dioxide gas flow rate is 10~15L / min, the welding wire diameter is 1.2mm, and the wire feeding speed is 800~1000mm / min; the welding speed is the linear speed of the roller rotation.

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