CN114535939B - Method for manufacturing longitudinal submerged arc welded pipe - Google Patents
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- CN114535939B CN114535939B CN202210288335.2A CN202210288335A CN114535939B CN 114535939 B CN114535939 B CN 114535939B CN 202210288335 A CN202210288335 A CN 202210288335A CN 114535939 B CN114535939 B CN 114535939B
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Abstract
The invention provides a method for manufacturing a longitudinal submerged arc welded pipe, which is characterized in that the position of a groove of a welded pipe is rotated to 6 o 'clock position from 12 o' clock position by adjusting the position of the welded pipe during prewelding, nine groups of rollers of a seaming machine are correspondingly rotated by 180 degrees, wherein the No. 9 roller is rotated to 6 o 'clock position from 12 o' clock position, and the seaming rollers of the seaming machine apply driving force to act on the circumference of the steel pipe and the vicinity of the groove and perform prewelding treatment. The prewelding device is changed from the 12 o 'clock position outside the welded pipe to the 6 o' clock position inside the welded pipe. Therefore, the problems that the existing welded pipe is firstly tracked and then prewelded after coming out of the row rollers of the joint closing machine, the welded pipe is prewelded after being slotted in different degrees, the misalignment and the welding beading are easily generated, the welding beading influences the tracking of the inner welding cutter wheel and the like are solved. In addition, the submerged-arc welding of the welded pipe adopts the mode that the submerged-arc automatic welding is firstly carried out for external submerged-arc welding and then is carried out for internal submerged-arc welding, so that the internal welding quality is improved, the repair of internal welding seams is reduced, the qualification rate is greatly improved, and the repair cost is also reduced.
Description
Technical Field
The invention belongs to the technical field of welded pipe manufacturing methods, and particularly relates to a manufacturing method of a longitudinal submerged arc welded pipe.
Background
The welded pipe, also called welded steel pipe, is a steel pipe made of steel plate or strip steel by cold forming and welding, and is widely used in various industries.
When the longitudinal submerged arc welded pipe is jointed and automatically welded in the manufacturing process, prewelding treatment is firstly carried out on an outer groove at the position of 12 points of the longitudinal submerged arc welded pipe, then inner submerged arc automatic welding is carried out, and finally outer submerged arc automatic welding is carried out.
The longitudinal submerged arc welded pipe uses the seaming and automatic welding mode, the welded pipe needs to be tracked and prewelded after coming out of the row rollers of the seaming machine, so that the condition that the formed seam is not prewelded under the condition of reliable control in the seaming machine can be caused, thus the prewelding after slotting is easy to form, the misalignment and the welding beading are easy to generate, and the welding beading can influence the tracking of an inner welding cutter wheel and the like. In addition, because the inner submerged arc welding is firstly carried out and then the outer submerged arc welding is carried out, the inner submerged arc welding is carried out on the basis of the prewelding which is gas shielded welding, the penetration depth is shallow, deposited metal is less, the risk of burning through exists when the heat input quantity of the inner submerged arc welding is larger, the defect risk of the inner submerged arc welding is increased due to the small heat input quantity, and the problems that the repair of the inner welding defect is influenced by space, and the repair difficulty and the repair cost are increased are solved.
Disclosure of Invention
The invention aims to provide a method for manufacturing a longitudinal submerged arc welded pipe, and aims to solve the problems that when a formed seam is not prewelded under the condition of reliable control in a seaming machine, prewelding after slotting is easy to form, misalignment and welding beading are generated, and the tracking of an inner welding cutter wheel can be influenced by the welding beading, in addition, because the outer submerged arc welding is carried out after the inner submerged arc welding is carried out, the risk of burning through exists when the heat input quantity of the inner submerged arc welding is large, the defect risk of the inner submerged arc welding is increased due to small heat input quantity, the defect repair of the inner welding is influenced by space, and the repair difficulty and the repair cost are increased.
In order to realize the purpose, the invention adopts the technical scheme that: the method for manufacturing the longitudinal submerged arc welded pipe comprises the following steps:
s1: primarily forming a welded pipe, namely milling edges of a steel plate, pre-bending and forming to form an open cylinder;
s2: the method comprises the following steps of (1) seam-welding and prewelding welded pipes, adjusting the positions of the welded pipes by using an initially formed open-tubular welded pipe, enabling the groove positions of the welded pipes to rotate from 12 o 'clock positions to 6 o' clock positions, placing the welded pipes into seam-welding row rollers of a seam-welding machine, applying main force to the seam-welding row rollers of the seam-welding machine and acting on the circumference of a steel pipe and the vicinity of the groove, enabling two grooves of the steel pipe located at the 6 o 'clock positions to be closed to be in a staggered edge-free and slotted state, and prewelding the welded pipes at the 6 o' clock positions in the welded pipes by using a prewelding device;
s3: the submerged-arc welding of the welded pipe adopts automatic submerged-arc welding to firstly carry out external submerged-arc welding and then carry out internal submerged-arc welding;
s4: and (3) finishing the welded pipe, cold expanding the whole pipe length, correcting, rounding and performing a hydrostatic test when needed, and trimming the end of the pipe after the pipe end is flat-headed, so as to finally prepare the finished welded pipe.
In one possible implementation, the welding heat input is reduced by 10% to 20% when performing submerged arc welding, and is increased by 10% to 20% when performing submerged arc welding to increase the molten metal solidification time at the weld.
In one possible implementation, the submerged arc automatic welding uses high toughness submerged arc welding to sinter the flux and the welding wire, while tracking the weld quality in real time using a laser weld automatic tracking device.
In a possible implementation mode, the groove position of the welded pipe is rotated by 180 degrees, the groove position of the welded pipe is rotated to 6 o 'clock position, the whole seaming machine is rotated by 180 degrees, the 9# seaming row roller is rotated to 6 o' clock position, the prewelding device is rotated by 180 degrees, and prewelding is carried out by changing the 12 o 'clock position outside the welded pipe to the 6 o' clock position inside the welded pipe.
The method for manufacturing the longitudinal submerged arc welded pipe has the advantages that: compared with the prior art, the method for manufacturing the longitudinal submerged arc welded pipe has the advantages that the prewelding is not carried out before the welded pipe leaves the joint closing row roller, namely, the whole welded pipe is under the constraint of the joint closing row roller, and the joint closing position is always kept to be closed without a seam and finished in a staggered state. Therefore, the problem that the formed seam is not prewelded under the condition of reliable and controlled in the seaming machine due to the fact that the existing welded pipe is tracked firstly and prewelded secondly after coming out of the row rollers of the seaming machine is solved. The problem that the tracking of the inner welding cutter wheel is influenced by the formation of welding beading due to the fact that the welded pipe is prewelded after being slotted is avoided. Meanwhile, the process of firstly carrying out the outer submerged arc welding and then carrying out the inner submerged arc welding is adopted, so that the inner welding is carried out on the basis of the outer welding, the heat input amount of the inner welding can be improved, and the defects can be obviously reduced. Because the internal welding environmental condition is relatively poor compared with the external welding, the defects are easy to generate, and the repair environmental condition inside the welded pipe is relatively poor compared with the external welding. Therefore, the repair of the inner welding line is reduced, the qualification rate is greatly improved, and the repair cost is also reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a longitudinal submerged arc welded pipe manufacturing method according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the method for manufacturing the longitudinal submerged arc welded pipe according to the present invention will now be described. The manufacturing method of the longitudinal submerged arc welded pipe comprises the following steps:
s1: preliminarily forming a welded pipe, namely milling edges of a steel plate, pre-bending and forming to form an open cylinder;
s2: the method comprises the steps of welded pipe joint closing prewelding, adjusting the position of a welded pipe by an opening cylindrical welded pipe which is preliminarily formed, rotating the groove position of the welded pipe by 180 degrees to 6 o ' clock positions, integrally rotating a joint closing machine by 180 degrees, rotating a 9# roller to 6 o ' clock positions, placing the opening cylindrical welded pipe in a joint closing row roller of the joint closing machine, applying driving force to the joint closing row roller of the joint closing machine and acting on the circumference of the steel pipe and the vicinity of the groove, enabling two grooves of the steel pipe which are positioned at the 6 o ' clock positions to be closed to be in a staggered edge-free and slotted state, rotating a prewelding device by 180 degrees, and changing the 12 o ' clock position outside the welded pipe to the 6 o ' clock position inside the welded pipe to preweld;
s3: the method comprises the following steps of (1) welding pipe submerged-arc welding, namely performing external submerged-arc welding firstly by adopting submerged-arc automatic welding, and then performing internal submerged-arc welding;
s4: and (3) finishing the welded pipe, cold expanding the whole pipe length, correcting, rounding and performing a hydrostatic test when needed, and trimming the end of the pipe after the pipe end is flat-headed, so as to finally prepare the finished welded pipe.
At the preliminary fashioned in-process of welded tube, the processing mode through milling the both sides limit of steel sheet obtains the groove angle and the degree of depth that needs, truncated edge size and steel sheet width, carry out the preflex processing before the steel sheet is buckled, in order to eliminate flange straight flange, bend out the circular arc to the side of steel sheet earlier, the circular arc requirement is bent to in the reuse standard, later with the steel sheet preliminary bending into open-ended tube-shape, in order to form preliminary welded tube structure, progressive cold deformation has been carried out to the whole circumference of welded tube during the shaping, make along the residual stress on welded tube wall thickness and the circumferencial direction even.
The welded pipe is produced by a seaming machine, a main frame body of the seaming machine is an annular frame which can move up and down along an upright post, nine combined seam row rollers are arranged on the circumference of the annular frame and pressed on the surface of the pipe blank, the pipe blank is closed by applying inward acting force to the seam row rollers, and rollers with different numbers are arranged on each seam row roller. Two ends of the joint closing row roller are respectively provided with a worm gear lifting mechanism, the worm gear lifting mechanisms drive the joint closing row roller to synchronously move along the radial direction of the steel pipe, the two worm gear lifting mechanisms driving the joint closing row roller are arranged on two sides of the same position of the annular frame, and the No. 1-8 rollers can swing for an angle along the annular guide rail on the annular frame.
Among the nine combined seam row rollers, the 9# row roller is a fixed roller beam and is positioned at the position of 6 o' clock. Through adjusting the welded pipe, the groove position of the welded pipe is rotated to 6 o 'clock position, namely, the groove position coincides with the 9# joint closing row roller, and the prewelding device prewelds the inner groove at the 6 o' clock position in the welded pipe, so that an operation space is provided for joint closing prewelding. The inner groove pre-welding can be carried out in the welding pipe, and the welding spot can be selected at a reasonable position, so that the pre-welding spot is scientific and reasonable, the joint quality is ensured, and the joint quality lays the foundation for the quality guarantee of the subsequent submerged arc automatic welding.
Meanwhile, in order to ensure the quality of joint closing, the joint closing row rollers on the two sides of the welded pipe can apply acting force inwards so as to ensure that the two grooves of the welded pipe are closed to be in a non-slit and staggered state for prewelding. By using the method for seaming the longitudinal submerged arc welded pipe, the welded pipe is not prewelded before leaving the seaming row roller, namely the whole welded pipe is under the constraint of the seaming row roller, and the seaming part is always kept to be closed without a seam and is finished in a staggered state. Therefore, the problem that the formed seam is not prewelded under the condition of reliable and controlled in the seaming machine due to the fact that the existing welded pipe is tracked firstly and prewelded secondly after coming out of the row rollers of the seaming machine is solved. The problem that the tracking of the inner welding cutter wheel is influenced by the formation of welding beading due to the fact that pre-welding is carried out after the welded pipe is slotted is avoided.
Before carrying out external submerged arc welding on the welded pipe, the welded pipe needs to be rotated to enable a joint area to be located at the 12 o' clock position of the welded pipe, the inner wall is cleaned, and the difference is that the welded pipe does not need to be rotated by 180 degrees and then is subjected to internal welding, but the external submerged arc welding is directly carried out for welding operation. After the completion of the outer submerged arc welding, the welded pipe was rotated again so that the joint area of the welded pipe was located at the 6 o' clock position of the welded pipe, and the welding operation was performed by the inner submerged arc welding. This is the same as the prior internal welding, which is performed by external welding after rotating 180 degrees.
Preferably, when the outer submerged arc welding and the inner submerged arc welding are carried out, high-toughness submerged arc welding sintered flux and welding wires are adopted, welding seams have high low-temperature impact toughness (-45 ℃ impact value CVN is more than or equal to 120J), and meanwhile the flux and the welding wires have good welding process performance and are suitable for multi-wire rapid welding under the condition of large heat input. For example, a sintered flux with high basicity, such as basicity of 1.8, is selected as a strong basic flux. When the welding flux and the welding wire are used, the surface of a welding seam is formed smoothly, the welding wave is fine and dense, the welding bead is uniform, surface pores and pockmarks are avoided, undercut is avoided, the welding seam is slight gray white, molten slag can automatically and completely fall off after welding, and the phenomenon of slag adhesion is avoided. Preferably, the alkalinity is controlled between 1.75 and 1.85.
Meanwhile, when the outer submerged arc welding and the inner submerged arc welding are carried out, the automatic tracking device is adopted to track the quality of the welding seam in real time, and the automatic tracking device adopts a comprehensive mode of video acquisition and temperature acquisition so as to realize the supervision of the welding condition.
In addition, because the outer submerged arc welding is finished before the inner submerged arc welding, the burn-through problem caused by the inner welding is avoided. Therefore, the heat input can be properly improved by 10-20 percent, the time of the liquid metal of the welding seam is prolonged, the gas and slag are fully discharged, and the common defects of the inner welding seam, namely gas holes and slag inclusion, can be greatly reduced, thereby improving the quality of the inner welding seam, reducing the inner repair, improving the production efficiency and reducing the cost. On the basis, the heat input amount can be correspondingly reduced by 10-20% for the external submerged arc welding so as to obtain the proper internal and external welding weight.
In addition, because the outer submerged arc welding is prior to the inner submerged arc welding, the inner welding is carried out on the basis of the outer welding, and the inner welding defects can be obviously reduced. Because the internal welding environmental condition is relatively poor compared with the external welding, the defects are easy to generate, and the repair environmental condition inside the welded pipe is relatively poor compared with the external welding. Therefore, the repair of the inner welding line is reduced, the qualified rate is greatly improved, and the repair cost is also reduced.
In the operation of the above-mentioned adjustment welded tube position, rotate 180 together with the welded tube with the linking machine, it is worth noting that prewelding device at this moment arranges the inside 6 o 'clock position from the welded tube outside and prewelds, and 9 groups of row rollers all arrange in the outside of welded tube, and 9# linking row rollers have been located 6 o' clock position. Finally, the groove position of the welded pipe is under the constraint of the No. 9 seaming row roller, and meanwhile, the prewelding space is not influenced.
In addition, when the welded pipe is finished, the welded pipe is firstly subjected to full-length cold expanding to eliminate residual stress, and straightening and rounding are performed when necessary, so that the perimeter, ovality and straightness of the welded pipe reach standard requirements. And machining the pipe end, trimming the end, and trimming the welding seam of the pipe end of the welded pipe to be in a smooth state. Finally, the welded pipe is put in storage after ultrasonic detection, X-ray detection, magnetic powder detection, nondestructive detection, water pressure detection, geometric dimension, appearance quality, magnetic detection and the like are carried out on the welded pipe.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The manufacturing method of the longitudinal submerged arc welded pipe is characterized by comprising the following steps:
s1: preliminarily forming the welded pipe, namely milling edges of the steel plate, pre-bending and forming to form an open cylinder;
s2: the method comprises the following steps of (1) seam-welding and prewelding welded pipes, adjusting the positions of the welded pipes by using preliminarily formed open tubular welded pipes, rotating the groove positions of the welded pipes by 180 degrees, rotating the groove positions of the welded pipes to 6 o 'clock positions, integrally rotating a seam welding machine by 180 degrees, rotating a 9# seam-welding row roller to 6 o' clock positions, rotating a prewelding device by 180 degrees, and changing the 12 o 'clock position outside the welded pipes to the 6 o' clock position inside the welded pipes to preweld; rotating the groove position of the welded pipe from the 12 o 'clock position to the 6 o' clock position, placing the welded pipe in a joint closing row roller of a joint closing machine, applying a driving force to the joint closing row roller of the joint closing machine and acting on the circumference of the steel pipe and the vicinity of the groove, enabling the two grooves of the steel pipe positioned at the 6 o 'clock position to be closed to a state without staggered edges and seams, and carrying out prewelding treatment at the 6 o' clock position in the welded pipe by a prewelding device;
s3: the submerged-arc welding of the welded pipe adopts automatic submerged-arc welding to firstly carry out external submerged-arc welding and then carry out internal submerged-arc welding;
s4: and (3) finishing the welded pipe, cold expanding the whole pipe length, correcting, rounding and performing a hydrostatic test when needed, and trimming the end of the pipe after the pipe end is flat-headed, so as to finally prepare the finished welded pipe.
2. The method of manufacturing a longitudinal submerged arc welded pipe according to claim 1, wherein the welding heat input amount is reduced by 10% to 20% when performing the submerged arc welding, and is increased by 10% to 20% when performing the submerged arc welding to increase the molten metal solidification time at the weld.
3. The method for manufacturing a longitudinal submerged arc welded pipe according to claim 1, wherein the submerged arc automatic welding employs a high toughness submerged arc welding sintered flux and a welding wire, and simultaneously tracks the quality of the weld in real time by using a laser automatic weld tracking device.
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