CN111940955A - Correction method for large-scale steel structure welding platform - Google Patents
Correction method for large-scale steel structure welding platform Download PDFInfo
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- CN111940955A CN111940955A CN202010819940.9A CN202010819940A CN111940955A CN 111940955 A CN111940955 A CN 111940955A CN 202010819940 A CN202010819940 A CN 202010819940A CN 111940955 A CN111940955 A CN 111940955A
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Abstract
The invention discloses a correction method of a large-scale steel structure welding platform, relates to the technical field of steel structure welding, and aims to solve the problem that normal cutting and blanking are easily affected if correction is not timely performed after welding deformation occurs in the conventional large-scale steel structure welding platform. Step 1: a bed-jig for flame straightening of a thin steel plate built by H-shaped steel is used as a base station, and the upper surface of the bed-jig is flat to bear the steel plate to be straightened; step 2, optimizing the plate seam arrangement: dividing the member into a plurality of small parts and member segments, and dispersing welding deformation on each part to ensure that the arrangement of welding seams of each part is symmetrical to or close to a section neutral axis of the member segment; for each main welding line, the size of a welding leg is selected to be 6-8 mm, the welding line is within 2000mm, excessive concentration and cross arrangement of the welding line are avoided, a wide and long steel plate is adopted, and the number of the welding lines is reduced; and step 3: assembling and welding, and assembling the components without the forcing of assembling stress; before welding, the components are fixed by clamping with a jig.
Description
Technical Field
The invention relates to the technical field of steel structure welding, in particular to a correction method of a large-scale steel structure welding platform.
Background
The steel structure building is one of the main building types in the current society and has wide application. Therefore the preparation of steel member is then especially important, directly influences the quality of steel construction, and large-scale steel member adopts the welding mode to constitute such as large-scale fossil fragments now more, welds nevertheless can appear following problem in the high efficiency in using: 1) after welding, a heat affected zone is formed near a welding seam due to the action of high temperature, and the heated zone of steel can deform to a corresponding degree after natural cooling to change the shape of a steel structure, so that the steel structure needing to be installed and used in a matched mode cannot be installed in a matched mode; 2) the welding seam can be cracked when the steel structure is deformed greatly, the welding structure has continuity, and once a local crack is generated, the local crack can be easily expanded to the whole body, so that the repair is labor-consuming. The H-shaped steel is mainly applied to the current steel structure building, the specification of the currently produced H-shaped steel is complete, particularly the H-shaped steel with larger specification is easy to generate lateral bending when being cooled, the lateral bending caused by the influence of cooling stress on the steel is not easy to eliminate after the H-shaped steel is cut to length, and the steel needs to be corrected in order to ensure the processing precision of the steel.
After welding deformation occurs in the existing large-scale steel structure welding platform, if correction is not timely carried out, normal cutting and blanking are easily affected; therefore, the existing requirements are not met, and a correction method of the large-scale steel structure welding platform is provided for the requirements.
Disclosure of Invention
The invention aims to provide a correction method of a large-scale steel structure welding platform, which aims to solve the problem that the normal cutting and blanking are easily affected if the existing large-scale steel structure welding platform is not corrected in time after welding deformation in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a correction method for a large steel structure welding platform comprises the following steps:
step 1: a bed-jig for flame straightening of a thin steel plate built by H-shaped steel is used as a base station, and the upper surface of the bed-jig is flat to bear the steel plate to be straightened;
step 2, optimizing the plate seam arrangement: dividing the member into a plurality of small parts and member segments, and dispersing welding deformation on each part to ensure that the arrangement of welding seams of each part is symmetrical to or close to a section neutral axis of the member segment; for each main welding line, the size of a welding leg is selected to be 6-8 mm, the welding line is within 2000mm, excessive concentration and cross arrangement of the welding line are avoided, a wide and long steel plate is adopted, and the number of the welding lines is reduced;
and step 3: assembling and welding, and assembling the components without the forcing of assembling stress; before welding, the component is fixed by clamping the tire clamp, so that the rigidity of the component is increased, and the welding deformation is reduced;
and 4, step 4: placing the steel plate equipment part on the upper surface of a thin steel plate flame straightening base erected by channel steel and fixing the upper surface;
and 5: placing the channel steel at a position flush with the edge of the steel plate;
step 6: a plurality of wedges are matched with a plurality of steel plate clips to be uniform at intervals of 400mm, a flange plate at one side of the channel steel is aligned with the edge of the steel plate, and the wedges are driven into the notches of the steel plate to clamp and fix the channel steel and the steel plate;
and 7: after the fixation, the welding area is thoroughly cleaned by acetone solution and dried;
and 8: controlling deformation during welding: by using argon + CO2Welding by mixed gas shielded arc welding, selecting welding parameters, CO2The flow of the welding wire is 10L/min-25L/min, the welding current depends on the wire feeding speed, the wire feeding speed is 18m/h-36m/h, the welding current is 160A-200A, the arc voltage is reduced, the welding speed and the current density are increased, the direct current reverse polarity is changed into the direct current positive polarity, and the intermittent welding is adopted; firstly welding short welding seams and then welding long welding seams, and adopting sectional back welding to sequentially carry out from inside to outside;
and step 9: and (3) correcting deformation after welding: and (5) straightening the steel structure by adopting a flame straightening method.
Preferably, the straightening of the steel structure by the flame straightening method in the step 9 specifically comprises:
step 9-1: performing at least one time of first heating correction on a part which generates bending deformation in the welding structure, wherein the heating mode of the first heating correction is triangular heating or strip heating;
step 9-2: planning a heating correction position and a correction point number according to the total length of the welding structure, performing subsection simultaneous heating correction, controlling the temperature of flame heating, and adopting a method of heating while spraying water for cooling in the operation process;
step 9-3: the second heating correction mode is vertically staggered correction, and the heating correction times in the second heating correction treatment process are at least one time;
step 9-4: the deformed part of the steel structure is shrunk and corrected to be smooth, and the welded steel structure is corrected to be finished.
Preferably, in the step 9-2, the flame heating temperature is controlled to be 700-900 ℃, and the heating time of each adjusting and repairing point is controlled to be 7-10 s.
Preferably, the planning of the heating correction position and the number of correction points in the step 9-2 specifically includes: and (3) defining a heating and adjusting point area on the welding line of the adjusting and correcting sample plate, controlling the diameter of the heating and adjusting point to be 10-15 mm, controlling the distance between the heating and adjusting points to be 20-50 mm, controlling the length of adjusting and correcting flame of a baking gun to be 50-60 mm, and performing point heating on the defined heating area on the welding line by using the tip of the adjusting and correcting flame.
Preferably, the welding speed in the step 8 is 18m/h-36m/h, the purity of argon is more than 99.99%, and the pressure is 0.2-0.4 MPa.
Preferably, after the first heating correction in the step 9-1 is completed, the deflection of the part generating bending deformation is between 16 and 20 mm.
Preferably, after the second heating and straightening treatment process in the step 9-3 is completed, the bending degree of the welded structure is 16-20mm, the side bending degree is 2-3 mm, and the torsion degree is 2-3 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention reduces and reduces welding deformation by effectively fixing the steel structure and arranging the plate seam before welding, quickly solves the problem of welding deformation, obviously releases the welding residual stress of the steel structure by setting reasonable flame adjusting and repairing parameters, corrects the welding deformation, improves the success rate of flame adjusting and repairing, avoids the problem of secondary deformation existing in the traditional mechanical adjusting and repairing, improves the working efficiency by adopting a method of heating and spraying water for cooling, actually saves half of the correcting time compared with other correcting methods, greatly reduces the heating point and the heating range, is convenient and quick to implement, can realize the correcting operation of larger H-shaped steel, and ensures the product quality and the precision.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
A correction method for a large steel structure welding platform comprises the following steps:
step 1: a bed-jig for flame straightening of a thin steel plate built by H-shaped steel is used as a base station, and the upper surface of the bed-jig is flat to bear the steel plate to be straightened;
step 2, optimizing the plate seam arrangement: dividing the member into a plurality of small parts and member segments, and dispersing welding deformation on each part to ensure that the arrangement of welding seams of each part is symmetrical to or close to a section neutral axis of the member segment; for each main welding line, the size of a welding leg is selected to be 6-8 mm, the welding line is within 2000mm, excessive concentration and cross arrangement of the welding line are avoided, a wide and long steel plate is adopted, and the number of the welding lines is reduced;
and step 3: assembling and welding, and assembling the components without the forcing of assembling stress; before welding, the component is fixed by clamping the tire clamp, so that the rigidity of the component is increased, and the welding deformation is reduced;
and 4, step 4: placing the steel plate equipment part on the upper surface of a thin steel plate flame straightening base erected by channel steel and fixing the upper surface;
and 5: placing the channel steel at a position flush with the edge of the steel plate;
step 6: a plurality of wedges are matched with a plurality of steel plate clips to be uniform at intervals of 400mm, a flange plate at one side of the channel steel is aligned with the edge of the steel plate, and the wedges are driven into the notches of the steel plate to clamp and fix the channel steel and the steel plate;
and 7: after the fixation, the welding area is thoroughly cleaned by acetone solution and dried;
and 8: controlling deformation during welding: by using argon + CO2Welding by mixed gas shielded arc welding, selecting welding parameters, CO2The flow of the welding wire is 10L/min-25L/min, the welding current depends on the wire feeding speed, the wire feeding speed is 18m/h-36m/h, the welding current is 160A-200A, the arc voltage is reduced, the welding speed and the current density are increased, the direct current reverse polarity is changed into the direct current positive polarity, and the intermittent welding is adopted; firstly welding short welding seams and then welding long welding seams, and adopting sectional back welding to sequentially carry out from inside to outside;
and step 9: and (3) correcting deformation after welding: and (5) straightening the steel structure by adopting a flame straightening method.
Further, the step 9 of straightening the steel structure by adopting a flame straightening method specifically comprises the following steps:
step 9-1: performing at least one time of first heating correction on a part which generates bending deformation in the welding structure, wherein the heating mode of the first heating correction is triangular heating or strip heating;
step 9-2: planning a heating correction position and a correction point number according to the total length of the welding structure, performing subsection simultaneous heating correction, controlling the temperature of flame heating, and adopting a method of heating while spraying water for cooling in the operation process;
step 9-3: the second heating correction mode is vertically staggered correction, and the heating correction times in the second heating correction treatment process are at least one time;
step 9-4: the deformed part of the steel structure is shrunk and corrected to be smooth, and the welded steel structure is corrected to be finished.
Further, in the step 9-2, the flame heating temperature is specifically controlled to be 700-900 ℃, and the heating time of each adjusting and repairing point is controlled to be 7-10 s.
Further, the planning of the heating correction position and the number of correction points in step 9-2 specifically includes: and (3) defining a heating and adjusting point area on the welding line of the adjusting and correcting sample plate, controlling the diameter of the heating and adjusting point to be 10-15 mm, controlling the distance between the heating and adjusting points to be 20-50 mm, controlling the length of adjusting and correcting flame of a baking gun to be 50-60 mm, and performing point heating on the defined heating area on the welding line by using the tip of the adjusting and correcting flame.
Further, in the step 8, the welding speed is 18m/h-36m/h, the purity of argon is more than 99.99%, and the pressure is 0.2-0.4 MPa.
Further, after the first heating correction in step 9-1 is completed, the deflection of the portion where the bending deformation is generated is between 16 and 20 mm.
Further, after the second heating and correcting treatment process in the step 9-3 is completed, the bending degree of the welded structure is 16-20mm, the side bending degree is 2-3 mm, and the torsion degree is 2-3 mm.
Example 2
A correction method for a large steel structure welding platform comprises the following steps:
step 1: a bed-jig for flame straightening of a thin steel plate built by H-shaped steel is used as a base station, and the upper surface of the bed-jig is flat to bear the steel plate to be straightened;
step 2, optimizing the plate seam arrangement: dividing the member into a plurality of small parts and member segments, and dispersing welding deformation on each part to ensure that the arrangement of welding seams of each part is symmetrical to or close to a section neutral axis of the member segment; for each main welding line, the size of a welding leg is selected to be 6-8 mm, the welding line is within 2000mm, excessive concentration and cross arrangement of the welding line are avoided, a wide and long steel plate is adopted, and the number of the welding lines is reduced;
and step 3: assembling and welding, and assembling the components without the forcing of assembling stress; before welding, the component is fixed by clamping the tire clamp, so that the rigidity of the component is increased, and the welding deformation is reduced;
and 4, step 4: placing the steel plate equipment part on the upper surface of a thin steel plate flame straightening base erected by channel steel and fixing the upper surface;
and 5: placing the channel steel at a position flush with the edge of the steel plate;
step 6: a plurality of wedges are matched with a plurality of steel plate clips to be uniform at intervals of 400mm, a flange plate at one side of the channel steel is aligned with the edge of the steel plate, and the wedges are driven into the notches of the steel plate to clamp and fix the channel steel and the steel plate;
and 7: after the fixation, the welding area is thoroughly cleaned by acetone solution and dried;
and 8: controlling deformation during welding: by using argon + CO2Welding by mixed gas shielded arc welding, selecting welding parameters, CO2The flow of the welding wire is 10L/min-25L/min, the welding current depends on the wire feeding speed, the wire feeding speed is 18m/h-36m/h, the welding current is 160A-200A, the arc voltage is reduced, the welding speed and the current density are increased, the direct current reverse polarity is changed into the direct current positive polarity, and the intermittent welding is adopted; firstly welding short welding seams and then welding long welding seams, and adopting sectional back welding to sequentially carry out from inside to outside;
and step 9: and (3) correcting deformation after welding: and (5) straightening the steel structure by adopting a flame straightening method.
Further, the step 9 of straightening the steel structure by adopting a flame straightening method specifically comprises the following steps:
step 9-1: performing at least one time of first heating correction on a part which generates bending deformation in the welding structure, wherein the heating mode of the first heating correction is triangular heating or strip heating;
step 9-2: planning a heating correction position and a correction point number according to the total length of the welding structure, performing subsection simultaneous heating correction, controlling the temperature of flame heating, and adopting a method of heating while spraying water for cooling in the operation process;
step 9-3: the second heating correction mode is vertically staggered correction, and the heating correction times in the second heating correction treatment process are at least one time;
step 9-4: the deformed part of the steel structure is shrunk and corrected to be smooth, and the welded steel structure is corrected to be finished.
Further, in the step 9-2, the flame heating temperature is specifically controlled to be 700-900 ℃, and the heating time of each adjusting and repairing point is controlled to be 7-10 s.
Further, the planning of the heating correction position and the number of correction points in step 9-2 specifically includes: and (3) defining a heating and adjusting point area on the welding line of the adjusting and correcting sample plate, controlling the diameter of the heating and adjusting point to be 10-15 mm, controlling the distance between the heating and adjusting points to be 20-48 mm, controlling the length of adjusting and correcting flame of a baking gun to be 50-60 mm, and performing point heating on the defined heating area on the welding line by using the tip of the adjusting and correcting flame.
Further, in the step 8, the welding speed is 18m/h-36m/h, the purity of argon is more than 99.99%, and the pressure is 0.2-0.4 MPa.
Further, after the first heating correction in step 9-1 is completed, the deflection of the portion where the bending deformation is generated is between 16 and 20 mm.
Further, after the second heating and correcting treatment process in the step 9-3 is finished, the bending degree of the welding structure is 16-20mm, the side bending degree is 2-3 mm, and the torsion degree is 2-3 mm;
further, in step 9-1, before the first heat treatment for correcting the portion where the bending deformation occurs, the method further includes: marking a part of the welding structure, which generates bending deformation;
further, in step 9-3, before performing the second heat treatment process on the portion of the welded structure where the distortion occurs, the method further includes: identifying a part of the welding structure where torsional deformation occurs;
further, the repair flame in step 9-2 is an oxyacetylene flame.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. A correction method for a large-scale steel structure welding platform is characterized by comprising the following steps: the method comprises the following steps:
step 1: a bed-jig for flame straightening of a thin steel plate built by H-shaped steel is used as a base station, and the upper surface of the bed-jig is flat to bear the steel plate to be straightened;
step 2, optimizing the plate seam arrangement: dividing the member into a plurality of small parts and member segments, and dispersing welding deformation on each part to ensure that the arrangement of welding seams of each part is symmetrical to or close to a section neutral axis of the member segment; for each main welding line, the size of a welding leg is selected to be 6-8 mm, the welding line is within 2000mm, excessive concentration and cross arrangement of the welding line are avoided, a wide and long steel plate is adopted, and the number of the welding lines is reduced;
and step 3: assembling and welding, and assembling the components without the forcing of assembling stress; before welding, the component is fixed by clamping the tire clamp, so that the rigidity of the component is increased, and the welding deformation is reduced;
and 4, step 4: placing the steel plate equipment part on the upper surface of a thin steel plate flame straightening base erected by channel steel and fixing the upper surface;
and 5: placing the channel steel at a position flush with the edge of the steel plate;
step 6: a plurality of wedges are matched with a plurality of steel plate clips to be uniform at intervals of 400mm, a flange plate at one side of the channel steel is aligned with the edge of the steel plate, and the wedges are driven into the notches of the steel plate to clamp and fix the channel steel and the steel plate;
and 7: after the fixation, the welding area is thoroughly cleaned by acetone solution and dried;
and 8: controlling deformation during welding: by using argon + CO2Welding by mixed gas shielded arc welding, selecting welding parameters, CO2The flow of the welding wire is 10L/min-25L/min, the welding current depends on the wire feeding speed, the wire feeding speed is 18m/h-36m/h, the welding current is 160A-200A, the arc voltage is reduced, the welding speed and the current density are increased, the direct current reverse polarity is changed into the direct current positive polarity, and the intermittent welding is adopted; firstly welding short welding seams and then welding long welding seams, and adopting sectional back welding to sequentially carry out from inside to outside;
and step 9: and (3) correcting deformation after welding: and (5) straightening the steel structure by adopting a flame straightening method.
2. The method for correcting the large-scale steel structure welding platform according to claim 1, wherein the method comprises the following steps: the step 9 of straightening the steel structure by adopting a flame straightening method specifically comprises the following steps:
step 9-1: performing at least one time of first heating correction on a part which generates bending deformation in the welding structure, wherein the heating mode of the first heating correction is triangular heating or strip heating;
step 9-2: planning a heating correction position and a correction point number according to the total length of the welding structure, performing subsection simultaneous heating correction, controlling the temperature of flame heating, and adopting a method of heating while spraying water for cooling in the operation process;
step 9-3: the second heating correction mode is vertically staggered correction, and the heating correction times in the second heating correction treatment process are at least one time;
step 9-4: the deformed part of the steel structure is shrunk and corrected to be smooth, and the welded steel structure is corrected to be finished.
3. The method for correcting the large-scale steel structure welding platform according to claim 2, wherein the method comprises the following steps: and 9-2, specifically, controlling the flame heating temperature to be 700-900 ℃, and controlling the heating time of each adjusting and repairing point to be 7-10 s.
4. The method for correcting the large-scale steel structure welding platform according to claim 2, wherein the method comprises the following steps: the planning of the heating correction position and the correction point number in the step 9-2 specifically comprises the following steps: and (3) defining a heating and adjusting point area on the welding line of the adjusting and correcting sample plate, controlling the diameter of the heating and adjusting point to be 10-15 mm, controlling the distance between the heating and adjusting points to be 20-50 mm, controlling the length of adjusting and correcting flame of a baking gun to be 50-60 mm, and performing point heating on the defined heating area on the welding line by using the tip of the adjusting and correcting flame.
5. The method for correcting the large-scale steel structure welding platform according to claim 1, wherein the method comprises the following steps: in the step 8, the welding speed is 18-36 m/h, the purity of argon is more than 99.99%, and the pressure is 0.2-0.4 MPa.
6. The method for correcting the large-scale steel structure welding platform according to claim 2, wherein the method comprises the following steps: after the first heating correction in the step 9-1 is finished, the deflection of the part generating bending deformation is between 16 and 20 mm.
7. The method for correcting the large-scale steel structure welding platform according to claim 2, wherein the method comprises the following steps: and after the second heating and correcting treatment process in the step 9-3 is finished, the bending degree of the welded structure is 16-20mm, the side bending degree is 2-3 mm, and the torsion degree is 2-3 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114669955A (en) * | 2022-04-29 | 2022-06-28 | 徐州徐工挖掘机械有限公司 | Method for preventing welding deformation of tube plate structure |
| CN115365691A (en) * | 2022-08-16 | 2022-11-22 | 北京首钢建设集团有限公司 | Steel structure ski jump platform track panel forming precision control method |
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| CN115365691A (en) * | 2022-08-16 | 2022-11-22 | 北京首钢建设集团有限公司 | Steel structure ski jump platform track panel forming precision control method |
| CN115365691B (en) * | 2022-08-16 | 2023-09-15 | 北京首钢建设集团有限公司 | Method for controlling forming precision of steel structure skiing diving platform race track panel |
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Application publication date: 20201117 |