An HLF elbow automatic welding device and welding process thereof

Abstract

The present invention discloses an HLF elbow automatic welding device and a welding process thereof, which belongs to the field of welding technology. The device includes a support plate, a first lifting column, a second lifting column, a welding assembly, a grinding assembly, and a fixing assembly. The first lifting column and the second lifting column are installed on the support plate, a first lifting block is installed on one side of the first lifting column, and a fixing assembly is installed on one side of the first lifting block. The fixing assembly can fix the elbow so that the elbow will not fall from the fixing assembly during rotation. The present invention is scientific and reasonable, safe and convenient to use, a second lifting block and a third lifting block are installed on one side of the second lifting column, and a grinding assembly is installed on one side of the second lifting block. The grinding assembly can grind the welded elbow after the elbow is welded, and a welding assembly is installed on one side of the third lifting block.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, in particular to an HLF elbow automatic welding device and a welding process thereof. Background Art

[0002] In a piping system, an elbow is a pipe fitting that changes the direction of the pipe. When connecting elbows, welding is a common method. In order to improve the welding quality, the ends are beveled to ensure a better fit of the elbow during welding.

[0003] However, the irregularity of the elbow itself makes it difficult to fix the elbow during welding. At the same time, due to the irregularity of the elbow, it is difficult to weld it into shape in one go. Only one side of the elbow can be welded first, and then the elbow can be turned over to complete the welding. Therefore, in order to solve the above problems, a new welding device is needed to automatically weld the elbow. Summary of the Invention

[0004] The object of the present invention is to provide an HLF elbow automatic welding device and a welding process thereof to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An HLF elbow automatic welding device, which includes a support plate, a first lifting column, a second lifting column, a welding assembly, a grinding assembly, and a fixing assembly. The first lifting column and the second lifting column are installed on the support plate, a first lifting block is installed on one side of the first lifting column, and a fixing assembly is installed on one side of the first lifting block. The fixing assembly can fix the elbow so that the elbow will not fall from the fixing assembly during rotation. A second lifting block and a third lifting block are installed on one side of the second lifting column, and a grinding assembly is installed on one side of the second lifting block. The grinding assembly can grind the welded elbow after welding. A welding assembly is installed on one side of the third lifting block. The welding assembly can adjust the angle of the welding gun. When the elbow rotates, the welding gun can follow the movement of the weld seam.

[0007] The fixing assembly includes a fixing tube, a return spring, a strut, and an airbag. An airbag is installed inside the fixing tube. The expansion of the airbag can push the strut out of the fixing tube, so that the strut is stuck in the inside of the elbow and fixes the position of the elbow. An electromagnetic valve is installed at one end of the airbag. After completing the fixation of the elbow, the electromagnetic valve releases the gas in the airbag to complete the reset of the strut. A second micro pump is installed at the other end of the airbag. The second micro pump can inflate the airbag to expand the airbag. A strut is installed on both sides of the airbag. The strut can be stretched open by the airbag to fix the elbow. The strut is connected to the fixing tube through a return spring. The return spring can restore the strut to its original position after the airbag deflates. The fixing tube is installed on one side of the first rotating shaft. A second motor is installed at one end of the first rotating shaft. The second motor can drive the first rotating shaft to rotate. The rotation of the first rotating shaft causes the elbow to rotate, so that the welding gun can weld without leaving any dead angles. One end of the first rotating shaft is fixed through a hole opened on the mounting plate.

[0008] The welding assembly includes a welding gun, an adjusting rod, and a support rod. The support rod can support the entire welding assembly. The support rod is connected to the adjusting rod through a second rotating shaft. Second rotating shafts are installed at both ends of the adjusting rod. The second rotating shaft can adjust the angle of the adjusting rod and the welding gun by rotation, so that the welding gun can move conveniently following the rotation of the elbow. A third motor is installed at one end of the second rotating shaft, and the third motor drives the rotating shaft to rotate. The adjusting rod is connected to the welding gun through the second rotating shaft.

[0009] The grinding assembly includes a connecting rod, which can support the grinding assembly, and a pin is installed at one end of the connecting rod, and the connecting rod is connected to the opening and closing plate through the pin, and the opening and closing plate can be separated into two parts to wrap the welded elbow welding point. An opening and closing annular groove is installed at one end of the opening and closing plate, and the opening and closing annular groove can be divided into two parts. A hole is opened on the outer edge of the opening and closing annular groove so that the first motor and the frosting ring contact at the opening of the opening and closing annular groove. The first motor is installed above the opening and closing plate, and the first motor contacts the frosting ring at the opening of the opening and closing annular groove. The rotation of the first motor drives the frosting ring to perform circular motion in the opening and closing annular groove, so that the frosting ring grinds the elbow, and a frosting ring is installed inside the opening and closing annular groove. The frosting ring rotates in the closed opening and closing annular groove to grind the elbow.

[0010] A welding wire holder is installed on the top surface of the support plate, a sleeve is installed on the upper end of the welding wire holder, and a welding wire coil is installed on the outer side of the sleeve.

[0011] The top surface of the support plate is installed with a slide rail. When the first lifting column needs to move, it can move in the slide rail to adjust the distance from the welding gun. The bottom surface of the support column plate is installed with a support column.

[0012] Step 1: Degrease, decontaminate and remove the oxide film on the welding edge of the elbow;

[0013] Step 2: Place the elbow to be welded on the welding device;

[0014] Step 3: Weld and polish the two elbows;

[0015] Step 4: Non-destructive testing of welds;

[0016] Step 5: Check the dimensions of the weld seam.

[0017] Step 6: Heat treatment of finished welding product.

[0018] In the step 1, the surface of the elbow to be welded needs to be polished with a paper grinding wheel and a wire brush for 10 minutes to obtain a flat surface to be welded, and then an acidic solution is used, the acidic solution is chromic acid, and the pH value of chromic acid is 2, to remove the oxide scale and rust of the elbow;

[0019] When placing the elbows in step 2, ensure that the central axes of the elbows are in the same plane;

[0020] In the step 3, the elbows to be welded are merged and polished by driving the first lifting block to move, and then welding and polishing are performed. The time for welding one elbow is 45 seconds, and the time for polishing is 1 minute.

[0021] In the step 4, the non-destructive testing of the weld adopts a spectral inspection method to detect the weld and the material of the base material;

[0022] The dimensional inspection of the weld in step 5 is mainly carried out using a weld inspection ruler to inspect the size of the weld. The difference between the maximum width and the minimum width of the weld within any 50mm weld length is less than or equal to 4mm. The height of the weld protruding from the interface is the residual height. Within the length range of any 25mm weld, if the weld surface is uneven, the difference between the maximum and minimum values ​​of the residual height is less than or equal to 2mm.

[0023] In step six, the heat treatment of the finished welded product is performed to enhance the strength and hardness of the finished product by heating the finished product. The finished welded product is first heated to 1000° C. and maintained for 10 minutes, then cooled to room temperature in air, and finally aged at 500° C.

[0024] The cleaning range of the elbow in step 1 includes 20 mm of the inner and outer walls of the groove.

[0025] The parameters for welding in step 3 are: tungsten electrode model and diameter: 3.2 mm cerium tungsten electrode WCe-20; welding wire model and diameter: 1.2 mm CHM-316L; welding gun nozzle diameter: 2.5 mm; shielding gas: 99.999% argon; gas flow: 20-25 (L / min) on the front side; welding current polarity: DC positive connection; welding current: 140-150 (A); wire feeding speed: 27-33 (cm / min).

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The irregular shape of the elbow itself requires that after one side of the elbow is welded, the other side needs to be flipped before welding can continue. The welding device of the present invention can directly complete the welding of the elbow at one time. There is no need to flip the elbow, but the elbow itself rotates, which improves efficiency.

[0028] 2. The welding assembly of the present invention can adjust the angle. During the process of elbow welding and rotation, the position of the welding point of the elbow is moving. The welding gun can move along with the position of the welding point during the process of elbow welding, so that the welding will not be interrupted due to the movement of the elbow, saving time.

[0029] 3. Because the elbow itself needs to rotate, the fixing tool that can clamp the elbow and rotate it is easy to block a part of the interface that needs to be welded when fixing the elbow, thereby blocking the continuity of the welding. The present invention can achieve fixation inside the elbow, thereby solving the problem of the fixing device blocking the welding port and ensuring the continuity of the welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a HLF elbow automatic welding device according to the present invention;

[0031] Figure 2 This is a schematic structural diagram of a side view of an HLF elbow automatic welding device of the present invention;

[0032] Figure 3 This is a schematic structural diagram of a fixing assembly of an HLF elbow automated welding device according to the present invention;

[0033] Figure 4 This is a schematic structural diagram of a grinding assembly of an HLF elbow automated welding device according to the present invention;

[0034] Figure 5 This is a schematic diagram of the second rotating shaft and third motor structure of an HLF elbow automated welding device of the present invention;

[0035] Figure 6The figure is a flow chart of an HLF elbow automated welding process according to the present invention.

[0036] Numbers in the figure: 1. Support plate; 2. Support column; 3. First lifting block; 4. Mounting plate; 5. First rotating axis; 6. Elbow; 7. First lifting column; 8. Second lifting block; 9. Connecting rod; 10. Pin; 11. Opening and closing plate; 12. Second lifting column; 13. Third lifting block; 14. Adjusting rod; 15. Third motor; 16. Second motor; 17. Support rod; 18. Second rotating axis; 19. Welding gun; 20. Slide rail; 21. Fixed tube; 22. Return spring; 23. Support; 24. Airbag; 25. Solenoid valve; 26. Second micro pump; 27. Wire bracket; 28. Wire roll; 29. ​​Sleeve; 30. Opening and closing annular groove; 31. First motor; 32. Frosting ring. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0038] Example 1:

[0039] like Figures 1 to 6 As shown, an HLF elbow automated welding device and the device includes a support plate 1, a first lifting column 7, a second lifting column 12, a welding assembly, a grinding assembly, and a fixing assembly. The support plate 1 is equipped with a first lifting column 7 and a second lifting column 12. A first lifting block 3 is installed on one side of the first lifting column 7. A fixing assembly is installed on one side of the first lifting block 3. The fixing assembly can fix the elbow 6 so that the elbow 6 will not fall from the fixing assembly during the rotation process. A second lifting block 8 and a third lifting block 13 are installed on one side of the second lifting block 8. A grinding assembly is installed on one side of the second lifting block 8. The grinding assembly can grind the welded elbow 6 after the elbow 6 is welded. A welding assembly is installed on one side of the third lifting block 13. The welding assembly can adjust the angle of the welding gun. When the elbow rotates, the welding gun 19 can move with the movement of the weld seam. When welding is required, the first lifting block 3 on the first lifting column 7 is moved so that the elbows 6 to be welded are merged together, and then welding is performed using the welding assembly. After welding is completed, the workpiece is polished using a grinding machine.

[0040] The fixing assembly includes a fixing tube 21, a return spring 22, a strut 23, and an airbag 24. The fixing tube 21 is internally installed with an airbag 24. The expansion of the airbag 24 can push the strut 23 out of the fixing tube 21, so that the strut 23 is stuck in the inside of the elbow 6 and fixes the position of the elbow 6. An electromagnetic valve 25 is installed at one end of the airbag 24. After completing the fixation of the elbow 6, the electromagnetic valve 25 releases the gas in the airbag 24 to complete the reset of the strut 23. The other end of the airbag 24 is installed with a second micro pump 26. The second micro pump 26 can inflate the airbag 24 to expand the airbag 24. Struts 23 are installed on both sides of the airbag 24. The strut 23 can be stretched open by the airbag 24 to fix the elbow 6. The strut 23 is connected to the fixing tube 21 through the return spring 22. The return spring 22 can restore the strut 23 to its original position after the airbag 24 deflates. The fixing tube 21 is installed at one end of the first rotating shaft 5 On the other hand, a second motor 16 is installed at one end of the first rotating shaft 5, and the second motor 16 can drive the first rotating shaft 5 to rotate. The rotation of the first rotating shaft 5 causes the elbow 6 to rotate, so that the welding gun 19 can weld without leaving a dead angle. One end of the first rotating shaft 5 is fixed through the hole opened on the mounting plate 4. When the elbow 6 needs to be polished, the elbow 6 needs to be fixed first, and the elbow 6 is put on the outside of the fixed tube 21. Then, the second micro pump 26 inflates the airbag 24. The airbag 24 expands and pushes the support 23 out. The support 23 clamps the inside of the elbow 6 and fixes the position of the elbow 6, so that the elbow 6 will not move or fall during the rotation process. Then, when rotation is required during the welding process, the second motor 16 needs to be driven to drive the rotating shaft 5 to rotate. The rotation of the rotating shaft 5 can drive the fixed tube 21 fixed on the rotating shaft 5 to rotate together. The elbow 6 is put on the outside of the fixed tube 21, and the elbow 6 is rotated together with the fixed tube 21.

[0041] The welding assembly includes a welding gun 19, an adjusting rod 14, and a support rod 17. The support rod 17 can support the entire welding assembly. The support rod 17 is connected to the adjusting rod 14 through a second rotating shaft 18. Second rotating shafts 18 are installed at both ends of the adjusting rod 14. The second rotating shaft 18 can adjust the angle of the adjusting rod 14 and the welding gun 19 by rotation, so that the welding gun 19 can move with the rotation of the elbow 6. A third motor 15 is installed at one end of the second rotating shaft 18, and the third motor 15 drives the rotating shaft to rotate. The adjusting rod 14 is connected to the welding gun 19 through the second rotating shaft 18. When welding is required, according to the position of the welding port, the third motor 15 is driven to drive the second rotating shaft 18 to rotate. The rotation of the second rotating shaft 18 can adjust the angle of the adjusting rod 14 and the welding gun 19.

[0042] The grinding assembly includes a connecting rod 9, which can support the grinding assembly. A pin 10 is installed at one end of the connecting rod 9. The connecting rod 9 is connected to the opening and closing plate 11 through the pin 10. The opening and closing plate 11 can be separated into two parts to wrap the welding point of the welded elbow 6. An opening and closing annular groove 30 is installed at one end of the opening and closing plate 11. The opening and closing annular groove 30 can be divided into two parts. A hole is opened on the outer side of the opening and closing annular groove 30 so that the first motor 31 and the frosting ring 32 are in contact at the opening of the opening and closing annular groove 30. A first motor 31 is installed above the opening and closing plate 11. The first motor 31 and the frosting ring 32 are in contact at the opening of the opening and closing annular groove 30. The rotation of the first motor 31 drives the frosting ring 32 to open and close. The annular groove 30 makes a circular motion so that the frosted ring 32 grinds the elbow 6. A frosted ring 32 is installed inside the opening and closing annular groove 30. The frosted ring 32 can also be divided into two parts. The frosted ring 32 rotates in the closed opening and closing annular groove 30 to grind the elbow 6. When the welding joint needs to be smoothed for grinding, the opening and closing plate 11 is opened. The opening of the opening and closing plate 11 drives the opening and closing annular groove 30 and the frosted ring 32 in the opening and closing annular groove 30 to separate together, and then the frosted ring 32 is allowed to surround the welding joint of the elbow 6. Then the first motor 31 is driven. The first motor 31 drives the frosted ring 32 to make a circular motion in the opening and closing annular groove 30 to grind the welding joint of the elbow 6 surrounded by the frosted ring 32.

[0043] A welding wire holder 27 is installed on the top surface of the support plate 1 , a sleeve 29 is installed on the upper end of the welding wire holder 27 , a welding wire coil 28 is installed on the outside of the sleeve 29 , and the welding wire coil 28 can be installed on the outside of the sleeve 29 for rotation.

[0044] The top surface of the support plate 1 is installed with a slide rail 20. When the first lifting column 7 needs to move, it can move in the slide rail 20 to adjust the distance from the welding gun 19. The bottom surface of the support column plate 1 is installed with a support column 2.

[0045] Example 2:

[0046] The first step is to degrease, decontaminate and remove the oxide film on the welding edge of the elbow. The surface of the elbow to be welded needs to be polished with a paper grinding wheel and a wire brush to obtain a smooth surface to be welded. Then use an acidic solution to remove the oxide scale and rust on the elbow. The cleaning range of the elbow includes 20mm on the inner and outer walls of the groove.

[0047] Step 2: Place the elbow to be welded on the welding device, making sure that the central axis of the elbow is in the same plane;

[0048] The third step is to weld and polish the two elbows together. Before polishing, you need to set the welding parameters: tungsten electrode model and diameter: 3.2mm cerium tungsten electrode WCe-20; welding wire model and diameter: 1.2mm CHM-316L; welding gun nozzle diameter: 2.5mm; shielding gas: 99.999% argon; gas flow: 20 (L / min) on the positive side; welding current polarity: DC positive connection; welding current: 140 (A); wire feeding speed: 27 (cm / min).

[0049] The fourth step is non-destructive testing of welds. Spectral inspection can be used to detect welds. The test result is the appearance of welds in the finished welded product.

[0050] The fifth step is to determine whether the finished welding product is unqualified.

[0051] Example 3:

[0052] The first step is to degrease, decontaminate and remove the oxide film on the welding edge of the elbow. The surface of the elbow to be welded needs to be polished with a paper grinding wheel and a wire brush to obtain a smooth surface to be welded. Then use an acidic solution to remove the oxide scale and rust on the elbow. The cleaning range of the elbow includes 20mm on the inner and outer walls of the groove.

[0053] Step 2: Place the elbow to be welded on the welding device, making sure that the central axis of the elbow is in the same plane;

[0054] The third step is to weld and polish the two elbows together. Before polishing, you need to set the welding parameters: tungsten electrode model and diameter: 3.2mm cerium tungsten electrode WCe-20; welding wire model and diameter: 1.2mm CHM-316L; welding gun nozzle diameter: 2.5mm; shielding gas: 99.999% argon; gas flow: 22 (L / min) on the positive side; welding current polarity: DC positive connection; welding current: 145 (A); wire feeding speed: 30 (cm / min).

[0055] The fourth step is to conduct non-destructive testing on the welds. The spectral inspection method can be used to detect the welds. The test results show that there are no welds in the finished welded product.

[0056] The fifth step is to inspect the size of the weld. The weld size is mainly inspected using a weld inspection ruler. The difference between the maximum and minimum widths of the weld within any 50mm weld length is 3mm. The height of the weld protruding from the interface is the residual height. Within the length range of any 25mm weld, when the weld surface is uneven, the difference between the maximum and minimum values ​​of the residual height is 1mm.

[0057] Step 6: Determine whether the finished welding product is qualified.

[0058] The seventh step is to heat treat the finished weld to enhance its strength and hardness. First, heat the finished weld to 1000°C and hold for 10 minutes. Then cool it to room temperature in air and finally perform aging treatment at 500°C.

[0059] Example 4:

[0060] The first step is to degrease, decontaminate and remove the oxide film on the welding edge of the elbow. The surface of the elbow to be welded needs to be polished with a paper grinding wheel and a wire brush to obtain a smooth surface to be welded. Then use an acidic solution to remove the oxide scale and rust on the elbow. The cleaning range of the elbow includes 20mm on the inner and outer walls of the groove.

[0061] Step 2: Place the elbow to be welded on the welding device, making sure that the central axis of the elbow is in the same plane;

[0062] The third step is to weld and polish the two elbows together. Before polishing, you need to set the welding parameters: tungsten electrode model and diameter: 3.2mm cerium tungsten electrode WCe-20; welding wire model and diameter: 1.2mm CHM-316L; welding gun nozzle diameter: 2.5mm; shielding gas: 99.999% argon; gas flow: 25 (L / min) on the positive side; welding current polarity: DC positive connection; welding current: 150 (A); wire feeding speed: 33 (cm / min).

[0063] The fourth step is non-destructive testing of welds. Spectral inspection can be used to detect welds. The test result is the appearance of welds in the finished welded product.

[0064] The fifth step is to determine whether the finished welding product is unqualified.

[0065] Comparison results: Based on the comparison of the results of Example 2, Example 3 and Example 4, Table 1 is obtained:

[0066]

[0067]

[0068] From the comparison results in Table 1, it can be seen that when the gas flow rate is 22 (L / min) and the current is 145 (A), no gap will appear when welding the elbow, while gaps will appear when the gas flow rate and current are 20 (L / min) and 140 (A) respectively or when the gas flow rate and current are 25 (L / min) and 150 (A) respectively.

[0069] The reason is that when the gas flow rate and welding current during welding are too small, and other conditions are constant, the welding gun's penetration ability is too small, and a weld cannot be formed during welding, or a weld is formed but gaps appear in the weld.

[0070] When the gas flow and welding current during welding are too large, and other conditions remain constant, the welding gun's penetration ability is too large, which can easily cause the elbow to overheat during welding, causing the metal on the elbow to melt and fall off, and the weld cannot be closed and gaps to appear.

[0071] Working principle:

[0072] When the elbow needs to be polished, the elbow needs to be fixed first, and the elbow is put on the outside of the fixed tube 21. Then the second micro pump 26 is used to inflate the airbag 24. The airbag 24 expands and pushes the support 23 out. The support 23 is clamped inside the elbow to fix the position of the elbow, so that the elbow will not move or fall off during the rotation. Then, when rotation is required during the welding process, the second motor 16 needs to be driven to drive the rotating shaft 5 to rotate. The rotation of the rotating shaft 5 can drive the fixed tube 21 fixed on the rotating shaft 5 to rotate together. The elbow is covered on the outside of the fixed tube 21, and the fixed tube 21 rotates with the elbow.

[0073] When welding is required, the third motor 15 is driven to rotate the second rotating shaft 18 according to the position of the welding port. The rotation of the second rotating shaft 18 can adjust the angles of the adjusting rod 14 and the welding gun 19.

[0074] In order to make the welding joint smoother and grind the welding joint, first open the opening and closing plate 11. The opening of the opening and closing plate 11 drives the opening and closing annular groove 30 and the frosted ring 32 in the opening and closing annular groove 30 to separate together. Then close the opening and closing plate 11. The opening and closing plate 11 brings the opening and closing annular groove 30 and the frosted ring 32 to surround the welding joint of the elbow. Then drive the first motor 31. The first motor 31 drives the frosted ring 32 to make a circular motion in the opening and closing annular groove 30 to grind the welding joint of the elbow surrounded by the frosted ring 32.

[0075] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An HLF elbow automatic welding device, characterized by: The invention comprises a support plate (1), a first lifting column (7), a second lifting column (12), a welding assembly, a grinding assembly, and a fixing assembly. The first lifting column (7) and the second lifting column (12) are installed on the support plate (1); a first lifting block (3) is installed on one side of the first lifting column (7); a fixing assembly is installed on one side of the first lifting block (3); a second lifting block (8) and a third lifting block (13) are installed on one side of the second lifting column (12); a grinding assembly is installed on one side of the second lifting block (8); and a welding assembly is installed on one side of the third lifting block (13); The fixing assembly includes a fixing tube (21), a return spring (22), a support (23), and an airbag (24); an elbow (6) is sleeved on the outer side of the fixing tube (21); an airbag (24) is installed inside the fixing tube (21); an electromagnetic valve (25) is installed at one end of the airbag (24); a second micro pump (26) is installed at the other end of the airbag (24); supporters (23) are installed on both sides of the airbag (24); the supporters (23) are connected to the fixing tube (21) through the return spring (22); the fixing tube (21) is installed on one side of the first rotating shaft (5); a second motor (16) is installed at one end of the first rotating shaft (5); and one end of the first rotating shaft (5) is fixed through a hole provided on the mounting plate (4); The welding assembly comprises a welding gun (19), a support rod (17), and an adjusting rod (14); the support rod (17) is connected to the adjusting rod (14) via a second rotating shaft (18); the second rotating shaft (18) is installed at both ends of the adjusting rod (14); a third motor (15) is installed at one end of the second rotating shaft (18); and the adjusting rod (14) is connected to the welding gun (19) via the second rotating shaft (18); The grinding assembly comprises a connecting rod (9), one end of which is provided with a pin shaft (10), the connecting rod (9) is connected to an opening and closing plate (11) via the pin shaft (10), one end of the opening and closing plate (11) is provided with an opening and closing annular groove (30), a first motor (31) is provided above the opening and closing plate (11), and a frosting ring (32) is provided inside the opening and closing annular groove (30).

2. The HLF elbow automatic welding device according to claim 1, characterized in that: A welding wire holder (27) is installed on the top surface of the support plate (1), a sleeve (29) is installed on the upper end of the welding wire holder (27), and a welding wire coil (28) is installed on the outer side of the sleeve (29).

3. The HLF elbow automatic welding device according to claim 1, characterized in that: The top surface of the support plate (1) is installed with a slide rail (20), and the bottom surface of the support plate (1) is installed with a support column (2).

4. The welding process of the HLF elbow automatic welding device according to any one of claims 1 to 3, wherein the steps are: Step 1: Degrease, decontaminate and remove the oxide film on the welding edge of the elbow; Step 2: Place the elbow to be welded on the welding device; Step 3: Weld and polish the two elbows; Step 4: Non-destructive testing of welds; Step 5: Check the dimensions of the weld seam. Step 6: Heat treatment of finished welding product.

5. A welding process according to claim 4, characterized in that: In the step 1, the surface of the elbow to be welded needs to be polished with a paper grinding wheel and a wire brush for 10 minutes to obtain a flat surface to be welded, and then an acidic solution is used. The acidic solution is chromic acid with a pH value of 2 to remove the oxide scale and rust on the elbow; When placing the elbows in step 2, ensure that the central axes of the elbows are in the same plane; In the step 3, the elbows to be welded are merged and polished by driving the first lifting block to move, and then welding and polishing are performed. The time for welding one elbow is 45 seconds, and the time for polishing is 1 minute. In the step 4, the non-destructive testing of the weld adopts a spectral inspection method to detect the weld and the material of the base material; The dimensional inspection of the weld in step 5 is mainly carried out using a weld inspection ruler to inspect the size of the weld. The difference between the maximum width and the minimum width of the weld within any 50mm weld length is less than or equal to 4mm. The height of the weld protruding from the interface is the residual height. Within the length range of any 25mm weld, if the weld surface is uneven, the difference between the maximum and minimum values ​​of the residual height is less than or equal to 2mm. In step six, the heat treatment of the finished welded product is performed to enhance the plasticity and toughness of the finished product by heating the finished product. First, the finished welded product is heated to 1000° C. and maintained for 10 minutes. Then, it is cooled to room temperature in air and finally aged at 500° C.

6. A welding process according to claim 4, characterized in that: The cleaning range of the elbow in step 1 includes 20 mm of the inner and outer walls of the groove.

7. A welding process according to claim 4, characterized in that: The parameters for welding in step 3 are as follows: the type and diameter of the tungsten electrode: 3.2 mm cerium tungsten electrode WCe-20; the type and diameter of the welding wire: 1.2 mm CHM-316L; the diameter of the welding gun nozzle: 2.5 mm; the shielding gas: 99.999% argon; Gas flow rate: 20-25 (L / min) on the positive side; polarity of welding current: DC positive connection; welding current: 140-150 (A); wire feeding speed: 27-33 (cm / min).

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