CN115846816A - CO (carbon monoxide) 2 Method for welding single-side V-shaped horizontal annular weld joint by automatic welding - Google Patents
CO (carbon monoxide) 2 Method for welding single-side V-shaped horizontal annular weld joint by automatic welding Download PDFInfo
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- CN115846816A CN115846816A CN202211339627.0A CN202211339627A CN115846816A CN 115846816 A CN115846816 A CN 115846816A CN 202211339627 A CN202211339627 A CN 202211339627A CN 115846816 A CN115846816 A CN 115846816A
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Abstract
The invention discloses CO 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint is generally applied to the welding task of an inner side or an outer reinforcing ring plate of a circular steel pipe; the invention realizes the application of the linear automatic welding method to the circular weld joint welding task, has the advantages of high mechanical welding degree, simple and convenient welding operation, excellent welding quality, high welding qualification rate, high production efficiency and the like, obviously reduces the labor intensity of welder operation, realizes the automatic welding of the circular weld joint by carbon dioxide, and replaces the technical innovation of manual welding.
Description
Technical Field
The invention relates to the technical field of ocean engineering petroleum, in particular to CO 2 A method for automatically welding a single-side V-shaped horizontal annular weld joint.
Background
In the manufacturing project of building steel structures in offshore oil production engineering of offshore oil in oceans, steel pipes are generally adopted as product components. In order to further enhance the strength requirement of the steel pipe, a large number of reinforcing ring plates are arranged on the inner sides or the outer sides of the block upright posts, the conduit legs and part of tie bars, a single-side V-shaped groove is adopted in construction design to be connected with a main structure, and the reinforcing ring plates exist in the inner reinforcing ring part of the middle part of the steel pipe or the outer reinforcing ring part of the connection of the upright steel pipe and the section steel block structure in a horizontal annular welding seam mode. In general, in the groove weld or fillet weld of the single-side V-shaped horizontal position circular weld, a manual arc welding or carbon dioxide welding method of manual welding operation is adopted, and the problems of high labor intensity, low production efficiency and unstable welding quality exist.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for carrying out CO treatment on a single-side V-shaped horizontal position annular welding line 2 A method for automatic welding.
In order to solve the technical problem, the invention provides CO 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint comprises the following steps:
s1: manufacturing a welding device: selecting a CO only with two straight walking wheels at the rear end 2 The automatic welding trolley is characterized in that a rapid positioning guide wheel device capable of turning inwards and outwards is installed at the bottom of the front end of the trolley, the front end of the trolley is connected with a positioning front guide fulcrum wheel with an adjustable angle, the rear end of the trolley is connected with a positioning rear guide fulcrum wheel with an adjustable angle, and the middle part of the trolley is provided with a welding gun 360-degree steering device;
s2: placing the welding device on a weldment, adjusting the contact angles of the positioning front guide fulcrum wheel and the positioning rear guide fulcrum wheel with the weldment, and adjusting the welding height and the welding angle of a welding gun;
s3: after the adjustment is proper, the walking button is started, the welding device is enabled to run for a circle around the horizontal position annular welding line, influence factors of the walking process are improved, and the welding device is ensured to meet the uniform walking condition;
s4: starting a welding button of a welding device to perform welding operation;
s5: and after welding, closing the welding button and the walking button.
According to a preferred embodiment of the invention, in step S1, the front positioning guide fulcrum wheel is arranged at an angle of 44-46 degrees with respect to the front end of the trolley.
According to a preferred embodiment of the invention, in step S1, the rear positioning guide fulcrum wheel is arranged at an angle of 64 ° to 66 ° with respect to the rear end of the trolley.
According to a preferred embodiment of the present invention, in step S1, if the welding gun cannot satisfy the welding angle condition according to the welding requirement, an extension plate with a long connecting hole is additionally installed, so that the welding gun extends outward by 59mm to 61mm.
According to a preferred embodiment of the invention, before the step S2, an electric tool is used to install a wind brush or a grinding wheel, and the edge of the groove of the weldment is cleaned and polished within 25mm to expose the metallic luster, so as to ensure that no oil stains, cutting oxides and foreign matters influencing the welding quality exist around the weld joint.
According to a preferred embodiment of the present invention, before step S3, pre-weld preheating is performed according to welding process specification requirements, the pre-weld preheating temperature is not allowed to be lower than the minimum value of welding program design, the pre-weld preheating range is not smaller than 75mm, temperature measurement is performed on the reverse side of preheating during pre-weld preheating, and when a thick plate is preheated, uniform distribution of preheating temperature is required to prevent different preheating temperature differences.
According to a preferred embodiment of the invention, in step S4, a ventilation and smoke exhaust device is adopted during welding, and measures for preventing dust and toxic gas are taken.
According to a preferred embodiment of the invention, in step S4, the included angle of the weld is controlled to be 79-81 degrees, and the included angle of the weld is controlled to be 89-91 degrees.
According to a preferred embodiment of the invention, in step S4, the welding flux and the welding slag are cleaned in time to prevent the welding flux from falling off and blocking the travelling wheels of the welding trolley.
According to a preferred embodiment of the present invention, in step S4, each welding record in the welding process should be made, so as to ensure the reliability and effectiveness of the welding process.
The invention has the technical effects that:
1. the invention relates to CO 2 The method for welding the ring-shaped weld seam at the single-side V-shaped horizontal position by automatic welding only applies to the CO which travels in a straight line 2 An automatic welding trolley is additionally provided with a positioning front guide fulcrum wheel, a positioning rear guide fulcrum wheel, a rapid positioning guide wheel device and a welding gun 360-degree steering device,the automatic welding device has the advantages that guiding is achieved by taking the inner wall and the outer wall of the steel pipe as fulcrums, the welding trolley automatically takes the steel pipe as a center, the automatic welding process of the annular welding line is formed, the welding gun is always kept at an unchanged position, the automatic welding device is successfully applied to welding of the annular welding line at the horizontal position of the single-side V-shaped position, the automatic welding effect is achieved, manual welding is replaced, and the domestic technical blank is made up.
2. The invention relates to CO 2 According to the welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint, the trolley which can only be linearly welded is well applied to the unilateral V-shaped horizontal position annular groove weld joint through the method, the welding quality qualification rate is high through verification of practical application results, the welding production efficiency is high, the labor intensity of a welder is greatly reduced, the welding method is a good operation practice for automatically welding the unilateral V-shaped horizontal position annular weld joint through carbon dioxide, automatic welding is realized, and the technical innovation for manually welding the weld joint is replaced.
Drawings
FIG. 1 shows a CO according to the invention 2 The structural schematic diagram of the welding method for automatically welding the unilateral V-shaped horizontal position circular weld joint;
FIG. 2 is a partial schematic view of FIG. 1;
FIG. 3 shows a CO according to the invention 2 The structural schematic diagram of the welding device of the welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint.
Reference numerals: 1-fast positioning a guide wheel device; 2-positioning a front guide fulcrum wheel; 3-positioning a rear guide fulcrum wheel; 4-welding gun 360 degree steering device; 5-a welding gun; 6-steel pipe; 7-a reinforcement ring; 8-single-side V-shaped groove; 9-welding gun power line; and 10, trolley power lines.
Detailed Description
The present invention is further described below in conjunction with the drawings and the embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
As shown in FIGS. 1 to 3, a CO 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint comprises the following steps:
s1: welding ofManufacturing a device: selecting a CO only with two straight walking wheels at the rear end 2 The automatic welding trolley is characterized in that a rapid positioning guide wheel device 1 capable of turning inwards and outwards is installed at the bottom of the front end of the trolley, an angle-adjustable positioning front guide fulcrum wheel 2 is connected to the front end of the trolley, an angle-adjustable positioning rear guide fulcrum wheel 3 is connected to the rear end of the trolley, and a welding gun 360-degree turning device 4 is installed in the middle of the trolley;
s2: placing the welding device on a weldment, adjusting the contact angles of the positioning front guide fulcrum wheel 2 and the positioning rear guide fulcrum wheel 3 with the weldment, and adjusting the welding height and the welding angle of a welding gun 5;
s3: after the adjustment is proper, the walking button is started, the welding device is enabled to run for a circle around the horizontal position annular welding line, influence factors of the walking process are improved, and the welding device is ensured to meet the uniform walking condition;
s4: starting a welding button of a welding device to perform welding operation;
s5: and after welding, closing the welding button and the walking button.
Specifically, in step S1, the positioning front guide fulcrum wheel 2 is arranged at a position which forms an angle of 44-46 degrees with the front end of the trolley.
Specifically, in the step S1, the positioning rear guide fulcrum wheel 3 is arranged at a position forming an angle of 64-66 degrees with the rear end of the trolley.
Specifically, in step S1, if the welding gun 5 cannot satisfy the welding angle condition according to the welding requirement, an extension plate with a long connecting hole is additionally installed, so that the welding gun 5 extends outward by 59mm to 61mm.
Specifically, before the step S2, an electric tool is used to install a wind brush or a grinding wheel, and the edge of the groove of the weldment is cleaned and polished within 25mm to expose metallic luster, so as to ensure that no oil stain, cutting oxide and foreign matters influencing the welding quality exist around the weld joint.
Specifically, before step S3, pre-welding preheating is performed according to the requirements of welding process specifications, the pre-welding preheating temperature is not allowed to be lower than the minimum value of welding program design, the pre-welding preheating range is not smaller than 75mm, temperature measurement is performed on the reverse side of preheating during pre-welding, when a thick plate is preheated, the preheating temperature distribution is required to be uniform, and different preheating temperature differences are prevented.
Specifically, in step S4, ventilation and smoke exhaust equipment is adopted during welding, and measures for preventing dust and toxic gas damage are taken.
Specifically, in step S4, the included angle of welding is controlled to be 79-81 degrees, and the inclination angle of welding is controlled to be 89-91 degrees.
Specifically, in step S4, the welding flux and the welding slag need to be cleaned in time, so as to prevent the welding flux from falling off and blocking the travelling wheels of the welding trolley.
Specifically, in step S4, each welding record in the welding process should be made, so as to ensure the reality, effectiveness, and accurate and reliable traceability.
As shown in fig. 1 to 3, the following devices are included: the device comprises a rapid positioning guide wheel device 1, a positioning front guide fulcrum wheel 2, a positioning rear guide fulcrum wheel 3, a welding gun 360-degree steering device 4, a welding gun 5, a steel pipe 6, a reinforcing ring 7, a single-side V-shaped groove 8, a welding gun power line 9 and a trolley power line 10.
Manufacturing a welding device:
1. selecting one CO 2 The automatic welding trolley has a magnetic adsorption function but does not have a welding swinging function, is only suitable for being applied to straight line walking welding of straight welding seams, but does not have a function of welding annular welding seams at horizontal positions;
2. manufacturing a quick positioning guide wheel device 1 which can only rotate inwards and outwards by more than 40 degrees;
3. the four wheels are uniformly distributed in the front and the back of the trolley, the front two wheels are removed, and the back two wheels are reserved. The front end of the trolley is provided with a quick positioning guide wheel device 1 which plays a role in automatic steering and walking in the welding process, and the rear two wheels form the trolley with three pivot points so as to facilitate walking and steering;
4、CO 2 the automatic welding trolley support arm is characterized in that according to the welding requirement, the welding angle condition cannot be met, the method of additionally installing an extension plate is adopted, so that the welding support arm extends outwards by about 60mm, and the extension plate is provided with a long connecting hole and can be installed and connected according to the position requirement;
5. manufacturing a positioning front guide fulcrum wheel 2 with a bearing, wherein one end of a support rod is connected with a sleeve pipe which is 50mm outside the bearing and can be tightened by a screw, an outer pipe is connected with a trolley at an angle position of 45 degrees in front of the trolley, and the support rod can be flexibly adjusted according to the requirement of the distance between pipe walls;
6. a positioning rear guide fulcrum wheel 3 with a bearing is manufactured, one end of a supporting rod is connected with a sleeve pipe which is 50mm outside the bearing and can be fastened through a screw, an outer pipe is connected with a trolley at an angle position of 25 degrees backwards behind the trolley, and the supporting rod can be flexibly adjusted according to the requirement of the distance of the pipe wall;
7. a welding gun 360-degree steering device 4 with a bearing is manufactured, is installed on a trolley and is fastened, and the upper part of the bearing sleeve is connected with a fixing clip through a support rod to form a whole. The welding gun 5 is connected with the welding gun 5 through a fixing ring arranged on the protruded bearing sleeve to be firmly fixed, and the bearing sleeve is connected with a welding gun 5 fixing and clamping device of the trolley. Therefore, the welding equipment can rotate and walk for 360 degrees when annular welding is formed, the bearing outer ring rotates, the inner ring and the welding gun 5 do not rotate, and the welding gun 5 is ensured to be fixed at a constant welding position all the time.
The operation method comprises the following steps:
1. introducing CO 2 The automatic welding trolley is placed on a weldment, the front supporting point is in contact with the inner wall and the outer wall at an angular position of 45 degrees, the rear supporting point is in contact with the pipe wall at an angular position of 25 degrees and is pushed to be solid, and the welding gun 5 penetrates into the welding gun 360-degree steering device 4 and is fixed firmly.
2. The welding height and the welding angle of the welding gun 5 are adjusted, and the walking button is started after the welding position is proper, so that the welding device can make a loop around the horizontal position annular welding line, the influence factors of the walking process are perfected, and the welding device is ensured to meet the uniform walking condition.
3. Start-up of CO 2 And a welding button on the automatic welding trolley, wherein the welding device starts to work when walking and welding electric arcs start to work simultaneously, and normal welding operation is carried out.
4. And adjusting the proper welding speed, controlling the welding included angle to be about 80 degrees, and controlling the welding inclination angle to be about 90 degrees.
5. The welding device has the functions of up-down, left-right adjustment, and reasonable adjustment of the angle of the welding gun 5 and the welding process parameters, and the welding device drives the welding gun 5 to automatically move along the pipe wall, so that the welding process is effectively formed.
6. The welding flux coating and the welding slag are timely cleaned in the welding process, and the problem that welding quality is affected due to the fact that welding trolley running wheels are blocked after the welding flux coating falls off and the welding trolley deviates or does not run is solved.
7. And for the single-side V-shaped horizontal annular groove weld or fillet weld applied to the thick plate, uninterrupted welding is carried out by applying a multilayer multi-pass welding process.
The process requirements are as follows:
1. before welding, an electric tool is used for installing an air brush or a grinding wheel, the edge of a groove of a weldment is cleaned and polished within 25mm to expose metallic luster, and oil stain, cutting oxides, foreign matters influencing welding quality and the like are avoided around a welding seam.
2. The method is executed according to the welding process rules officially approved by the project strictly, the preheating operation before welding is carried out according to the requirements, the proper current and voltage parameters are adjusted, and the heat input, the interlayer temperature and the like are strictly controlled.
3. The preheating temperature before welding is not allowed to be lower than the minimum value of welding program design, the preheating range before welding is not smaller than 75mm, the temperature is measured on the reverse side of the preheating during preheating before welding, and when the thick plate is preheated, the uniform distribution of the preheating temperature is required to be noticed, and the difference of the preheating temperature is prevented.
4. Welding process parameters are limited according to welding process assessment, welding technical specifications and standard requirements, welding parameters are strictly controlled not to exceed WPS-specified maximum parameter positioning welding and carbon arc gouging, and preheating is also required, wherein the preheating temperature is the same as that of formal welding.
5. The inner sides of the pipe legs and part of the lacing wires are provided with a large number of reinforcing rings 7 which are made of CO 2 The gas shielded welding is used for welding, and ventilation is poor at a plurality of positions. The ventilation and smoke exhaust equipment is adopted during welding, and a welder needs to pay attention to the measures of dust prevention and toxic gas damage prevention during welding.
6. And each welding record in the welding process is made, so that the method is real, effective, accurate and reliable in traceability.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. CO (carbon monoxide) 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint is characterized by comprising the following steps of:
s1: manufacturing a welding device: selecting a CO with two linear traveling wheels at the rear end 2 The automatic welding trolley is characterized in that a rapid positioning guide wheel device capable of turning inwards and outwards is installed at the bottom of the front end of the trolley, the front end of the trolley is connected with a positioning front guide fulcrum wheel with an adjustable angle, the rear end of the trolley is connected with a positioning rear guide fulcrum wheel with an adjustable angle, and the middle part of the trolley is provided with a welding gun 360-degree steering device;
s2: placing the welding device on a weldment, adjusting the contact angles of the positioning front guide fulcrum wheel and the positioning rear guide fulcrum wheel with the weldment, and adjusting the welding height and the welding angle of a welding gun;
s3: after the adjustment is proper, the walking button is started, the welding device is enabled to run for a circle around the horizontal position annular welding line, influence factors of the walking process are improved, and the welding device is ensured to meet the uniform walking condition;
s4: starting a welding button of a welding device to perform welding operation;
s5: and after welding, closing the welding button and the walking button.
2. CO according to claim 1 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint is characterized in that in the step S1, the positioning front guide fulcrum wheel is arranged at a position which forms an angle of 44-46 degrees with the front end of a trolley.
3. CO according to claim 1 2 The method for welding the annular welding seam at the single-side V-shaped horizontal position by automatic welding is characterized by comprising the following stepsIn the step S1, the positioning rear guide fulcrum wheel is arranged at a position forming an angle of 64-66 degrees with the rear end of the trolley.
4. CO according to claim 1 2 The method for welding the annular welding seam at the single-side V-shaped horizontal position by automatic welding is characterized in that in the step S1, if a welding gun cannot meet the welding angle condition according to the welding requirement, an extension plate with a long connecting hole is additionally arranged, so that the welding gun extends outwards by 59-61 mm.
5. CO according to claim 1 2 The method for welding the annular welding seam at the single-side V-shaped horizontal position by automatic welding is characterized in that before the step S2, an electric tool is used for installing a wind brush or a grinding wheel, the edge of the groove of the weldment is cleaned and polished within 25mm, and the metallic luster is exposed, so that no oil stain, cutting oxide and foreign matters influencing the welding quality are arranged around the welding seam.
6. CO according to claim 1 2 The method for welding the annular welding seam at the single-side V-shaped horizontal position by automatic welding is characterized in that before the step S3, pre-welding preheating work is carried out according to the requirements of welding process procedures, the pre-welding preheating temperature is not allowed to be lower than the minimum value of welding program design, the pre-welding preheating range is not smaller than 75mm, temperature measurement is carried out on the reverse side of preheating during pre-welding, when a thick plate is preheated, the uniform distribution of the preheating temperature needs to be noticed, and the difference of the preheating temperature is prevented.
7. CO according to claim 1 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint is characterized in that in the step S4, ventilation and smoke exhaust equipment is adopted during welding, and measures for preventing dust and toxic gas are taken.
8. CO according to claim 1 2 The welding method for automatically welding the unilateral V-shaped horizontal position annular weld joint is characterized in that in the step S4, the welding included angle is controlled to be 79-81 degrees, and the welding inclination angle is controlled to be 89-91 degrees.
9. CO according to claim 1 2 The method for welding the annular welding seam at the single-side V-shaped horizontal position in the automatic welding is characterized in that in the step S4, welding flux coatings and welding slag need to be cleaned in time, and the walking wheels of the welding trolley are prevented from being blocked after the welding flux coatings fall off.
10. CO according to claim 1 2 The method for welding the annular weld joint at the single-side V-shaped horizontal position by automatic welding is characterized in that in the step S4, each welding record in the welding process is required to be made, so that the method is real, effective, accurate and reliable in traceability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211339627.0A CN115846816A (en) | 2022-10-28 | 2022-10-28 | CO (carbon monoxide) 2 Method for welding single-side V-shaped horizontal annular weld joint by automatic welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211339627.0A CN115846816A (en) | 2022-10-28 | 2022-10-28 | CO (carbon monoxide) 2 Method for welding single-side V-shaped horizontal annular weld joint by automatic welding |
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| Publication Number | Publication Date |
|---|---|
| CN115846816A true CN115846816A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211339627.0A Pending CN115846816A (en) | 2022-10-28 | 2022-10-28 | CO (carbon monoxide) 2 Method for welding single-side V-shaped horizontal annular weld joint by automatic welding |
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| CN (1) | CN115846816A (en) |
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- 2022-10-28 CN CN202211339627.0A patent/CN115846816A/en active Pending
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