CN110977099A - Steel structure truss pipe column butt joint method - Google Patents
Steel structure truss pipe column butt joint method Download PDFInfo
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- CN110977099A CN110977099A CN201911315829.XA CN201911315829A CN110977099A CN 110977099 A CN110977099 A CN 110977099A CN 201911315829 A CN201911315829 A CN 201911315829A CN 110977099 A CN110977099 A CN 110977099A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to the technical field of pipe column butt joint, and discloses a steel structure truss pipe column butt joint method which comprises a pre-welding preparation and a welding process, wherein the pre-welding preparation comprises the preparation of equipment and tools, the selection of welding environment and welding rod and the selection of power polarity, the steel structure truss pipe column butt joint method is a crucial ring in the whole welding process by positioning welding, the formation of welding crater cracks can be effectively reduced by the positioning welding process, the performance of a component joint can be effectively improved, the cost is reduced, the welding quality is improved, dirt and the like on a welding piece is cleaned during the assembly, so that the butt joint of pipelines can be ensured to be avoided as far as possible, the welding quality of the pipelines can be simply ensured, the welding quality is improved, the lowest temperature of the pipelines made of various materials during the welding is limited, and the welding effect of the pipelines can not be influenced by the temperature during the welding, the quality of the pipeline during welding is ensured.
Description
Technical Field
The invention relates to the technical field of pipe column butt joint, in particular to a steel structure truss pipe column butt joint method.
Background
The pipeline connection means that the prefabricated pipe sections are connected into a complete system according to the requirements of design drawings. In construction, different connection methods should be selected according to the material of the used pipe. The common steel pipes are connected by threads, flanges, welding, socket joint, pipeline adhesion and the like, but the existing butt joint mode cannot perform good butt joint welding on the pipelines, so that the service life of the pipelines is shortened.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the steel structure truss pipe column butt joint method which has the advantages of being capable of accurately and precisely butt-jointing and welding pipelines and the like, and solves the problems.
(II) technical scheme
In order to achieve the above purpose, the invention provides the following technical scheme: the steel structure truss pipe column butt joint method comprises pre-welding preparation and a welding process, wherein the pre-welding preparation comprises S1, equipment and tool preparation; s2, selecting welding environment, electrode selection and power polarity, wherein the preparation of S1.1 equipment in the preparation of S1 equipment and tools comprises the following steps: an inverter welding machine or a silicon rectifier welding machine, preheating and heat treatment equipment and a high-temperature drying box; s1.2, preparing a tool as follows: the welding seam cleaning tools such as the angle grinder, the hammer, the wire brush and the like, S2, the selection of welding environment and welding rod and the selection of power polarity are specifically as follows: the welding environment temperature can ensure that the enough temperature and the welder operating skill required by the weldment during welding are not influenced, the welding rod adopts an alkaline welding rod, the alkaline welding rod needs to be dried before welding, a direct current reverse polarity connection method must be adopted for improving the stability of welding arc combustion and reducing the generation of splashing and air holes, and the S3 welding process comprises the following steps: s3.1, processing a pipeline groove; s3.2, grouping; s3.3, positioning and welding; s3.4, preheating; and S3.5, horizontally rotating and welding.
S3.1, the pipeline groove machining specifically comprises the following steps: the form and the size of the groove of the pipeline are required to be carried out according to the specification of a design file, the groove is processed by adopting a mechanical processing method or a thermal processing method such as oxyacetylene (propane) cutting, oxide skin slag on the surface of the groove and a surface layer influencing the quality of a joint are removed after the groove is processed by adopting the thermal processing method, and the uneven part is polished to be flat, and S3.2, the group is specifically as follows: weld before the assembly, should clear away totally with groove and the inside and outside surface oil, dirt, burr etc. that are not less than 10mm within range, the inner wall should flush when the pipe butt joint is organized, can avoid the wrong limit as far as (inner wall wrong limit volume should not exceed 10% of pipe wall thickness and be not more than 2mm), S3.3, tack welding specifically do: after the assembly is finished, the positioning welding is carried out, the length and the number of welding seams of the positioning welding are different according to the difference of pipe diameters, the positioning welding is immediately checked, if defects exist, the defects are immediately removed and repositioned, and the S3.4 preheating specifically comprises the following steps: preheating before welding meets the specification of a design document, generally preheating temperature is not lower than 200 ℃, preheating width is not less than 3 times of the thickness of a weldment and not less than 50mm on each side by taking the center of a welding seam as a reference, a temperature measurement mode can adopt a contact type thermometer or a temperature measurement pen, a preheating method can adopt point heating in principle, when the condition is not met, a flame heating method can be adopted, and S3.5, horizontal rotation welding specifically comprises the following steps: the sequence of welding is a bottom layer, a filling layer and a cover layer,
a, priming layer: striking an arc on the surface of the groove, then striking the arc to a welding position, welding along the welding seam after the truncated edge is melted through, observing the size and the breakdown condition of a molten pool in the welding process between about 3 and 2 points (according to clock points), welding by adopting an arc breaking method, completely removing slag after bottoming is finished, and particularly strictly cleaning a bonding line of the welding seam and the groove;
b, filling layer: according to specific conditions, single welding or multiple welding can be adopted, continuous arc welding is adopted, a welding rod angle with a larger current and a correct angle are allowed to be selected when filling welding is carried out, a strip conveying method can adopt crescent or zigzag swing, the amplitude is increased layer by layer, attention is paid to slightly staying at two sides of a broken opening, if multiple welding is needed, attention is paid to the overlapping amount (overlapping 1/3 or 2/3) between adjacent welding beads to avoid slag inclusion caused by grooves generated between the welding beads, and after filling, slag is cleaned and polished completely;
c, covering the surface layer: the current used is slightly smaller, the shape and size of the molten pool are kept uniform, the included angle between the welding rod and the welding direction is kept about 75 degrees, the welding rod is stopped slightly when swinging to the edge of the crevasse, so as to avoid undercut, and the method for jointing the cover layer comprises the following steps: when the welding rod is changed and the arc is closed, slightly filling molten drop molten iron, quickly changing the welding rod, striking an arc at about 10mm in front of an arc pit, then withdrawing the arc to 2/3 of the arc pit, and then normally welding after the arc pit is filled up.
Preferably, the drying temperature is 350-400 ℃, the heat preservation time is 1-2 h, the welding rods are required to be horizontally placed in layers during drying, the welding rods with the diameter of 3.2mm cannot exceed 5 layers at most, the welding rods with the diameter of 4mm cannot exceed 3 layers at most, the repeated drying times cannot exceed 3 times, and the welding rods are required to be taken at any time.
Preferably, the welding rod used in the welding process must be placed in a heat-preserving barrel, and the welding power source and the polarity application alkaline welding rod must be selected from direct current welding power sources.
Preferably, the lowest allowable ambient temperature during welding is specifically: carbon steel: -20 ℃, low alloy steel, ordinary low alloy steel: -10 ℃, medium and high alloy steel: 0 ℃ is used.
Preferably, the position of the pipe diameter larger than 100mm is not less than 3, the length of the positioning welding line is 5-10mm when the pipe diameter is not more than 100mm, and the length of the positioning welding line is larger than 15mm when the pipe diameter is larger than 100 mm.
(III) advantageous effects
Compared with the prior art, the invention provides a steel structure truss pipe column butt joint method, which has the following beneficial effects:
1. according to the steel structure truss pipe column butt joint method, the positioning welding is an important ring in the whole welding process, the formation of welding arc crater cracks can be effectively reduced through the positioning welding process, the performance of a component joint can be effectively improved, the cost is reduced, and the welding quality is improved.
2. According to the steel structure truss pipe column butt joint method, dirt and the like on a weldment are removed completely during assembly, so that the butt joint of pipelines can be prevented from being staggered as much as possible, the pipeline welding quality can be simply guaranteed, and the welding quality is improved.
3. According to the steel structure truss pipe column butt joint method, the lowest temperature of the pipeline made of materials is limited during welding, so that the welding effect of the pipeline cannot be influenced due to the temperature during welding, the conditions such as damage to the pipeline cannot be caused during welding, and the quality of the pipeline during welding is guaranteed.
4. According to the steel structure truss pipe column butt joint method, oxide skin slag on the surface of the groove and a surface layer influencing the quality of a joint are removed after the groove is processed through a hot processing method, and the uneven part is polished to be smooth, so that the groove can be butted more accurately when in butt joint, and the welding effect after the butt joint is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The steel structure truss pipe column butt joint method comprises pre-welding preparation and a welding process, wherein the pre-welding preparation comprises S1, equipment and tool preparation; s2, selecting welding environment, welding rod and power polarity, wherein in the preparation of the S1 equipment and tool, S1.1, the preparation of the equipment is as follows: contravariant welding machine or silicon rectifier welding machine, preheat and equipment for heat treatment and high temperature stoving case, S1.2, the preparation of instrument do: the welding seam cleaning tools such as the angle grinder, the hammer, the wire brush and the like, S2, the selection of welding environment and welding rod and the selection of power polarity are specifically as follows: the welding environment temperature is capable of ensuring that enough temperature and welder operation skill required by a weldment during welding are not affected, the welding rod adopts an alkaline welding rod, the alkaline welding rod is dried before welding, the drying temperature is 350-400 ℃, the heat preservation time is 1-2 h, the welding rod needs to be horizontally placed in layers during drying, the welding rod with the diameter of 3.2mm cannot exceed 5 layers at most, the welding rod with the diameter of 4mm cannot exceed 3 layers at most, the repeated drying frequency cannot exceed 3 times, and the welding rod needs to be taken at any time, the welding rod used during welding needs to be placed in a heat preservation barrel, a direct current welding power supply needs to be selected for the welding power supply and the polarity application alkaline welding rod, and a direct current reverse polarity connection method needs to be adopted in order to improve the stability of welding arc combustion and reduce the generation of splashing and air holes, and the welding process comprises the following steps: s3.1, processing a pipeline groove; s3.2, grouping; s3.3, positioning and welding; s3.4, preheating; s3.5, horizontally rotating and welding, wherein the lowest allowable environment temperature during welding is specifically as follows:
carbon steel: -20 ℃;
low alloy steel, ordinary low alloy steel: -10 ℃;
medium and high alloy steel: 0 deg.C
And the step S3.1 of processing the pipeline groove specifically comprises the following steps: the form and the size of the groove of the pipeline are required to be carried out according to the specification of a design file, the groove is processed by adopting a mechanical processing method or a thermal processing method such as oxyacetylene (propane) cutting, oxide skin slag on the surface of the groove and a surface layer influencing the quality of a joint are removed after the groove is processed by adopting the thermal processing method, and the uneven part is polished to be flat, and S3.2, the group is specifically as follows: weld before the assembly, should clear away totally with groove and the inside and outside surface oil, dirt, burr etc. that are not less than 10mm within range, the inner wall should flush when the pipe butt joint is organized, can avoid the wrong limit as far as (inner wall wrong limit volume should not exceed 10% of pipe wall thickness and be not more than 2mm), S3.3, tack welding specifically do: after the assembly is finished, performing tack welding, wherein the length and the number of tack welds are different according to the difference of pipe diameters, the position of the pipe diameter larger than 100mm is not less than 3, the length of the tack weld is 5-10mm when the pipe diameter is not more than 100mm, the length of the tack weld is larger than 15mm when the pipe diameter is larger than 100mm, immediately checking after the tack welding, and immediately clearing and repositioning if a defect exists, wherein S3.4 preheating specifically comprises the following steps: preheating before welding meets the specification of a design document, generally, the preheating temperature is not lower than 200 ℃, the preheating width is not less than 3 times of the thickness of a weldment and not less than 50mm on each side by taking the center of a welding seam as a reference, a contact type thermometer or a temperature measuring pen can be adopted as a temperature measuring mode, point heating is preferably adopted as a preheating method in principle, when the condition is not met, a flame heating method can be adopted, and S3.5 horizontal rotation welding specifically comprises the following steps: the sequence of welding is a bottom layer, a filling layer and a cover layer,
a, priming layer: striking an arc on the surface of the groove, then striking the arc to a welding position, welding along the welding seam after the truncated edge is melted through, observing the size and the breakdown condition of a molten pool in the welding process between about 3 and 2 points (according to clock points), welding by adopting an arc breaking method, completely removing slag after bottoming is finished, and particularly strictly cleaning a bonding line of the welding seam and the groove;
b, filling layer: according to specific conditions, single welding or multiple welding can be adopted, continuous arc welding is adopted, a welding rod angle with a larger current and a correct angle are allowed to be selected when filling welding is carried out, a strip conveying method can adopt crescent or zigzag swing, the amplitude is increased layer by layer, attention is paid to slightly staying at two sides of a broken opening, if multiple welding is needed, attention is paid to the overlapping amount (overlapping 1/3 or 2/3) between adjacent welding beads to avoid slag inclusion caused by grooves generated between the welding beads, and after filling, slag is cleaned and polished completely;
c, covering the surface layer: the current used is slightly smaller, the shape and size of the molten pool are kept uniform, the included angle between the welding rod and the welding direction is kept about 75 degrees, the welding rod is stopped slightly when swinging to the edge of the crevasse, so as to avoid undercut, and the method for jointing the cover layer comprises the following steps: when the welding rod is changed and the arc is closed, slightly filling molten drop molten iron, quickly changing the welding rod, striking an arc at about 10mm in front of an arc pit, then withdrawing the arc to 2/3 of the arc pit, and then normally welding after the arc pit is filled up.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The steel structure truss pipe column butt joint method comprises the following steps: the preparation and welding process before welding is characterized in that: the pre-weld preparation comprises the following steps: s1, preparing equipment and tools; and S2, selecting welding environment, welding rod and power polarity.
2. The steel structure truss pipe column butting method according to claim 1, wherein the method comprises the following steps: the S1 equipment and tools include the following steps:
s1.1, preparing equipment, namely an inverter welding machine or a silicon rectifier welding machine, preheating and heat treatment equipment and a high-temperature drying box;
s1.2, preparing tools, and cleaning the welding seams of an angle grinder, a hammer, a steel wire brush and the like.
3. The steel structure truss pipe column butting method according to claim 1, wherein the method comprises the following steps: s2 the welding environment, the electrode selection and the power polarity selection are specifically as follows: the welding environment temperature can ensure that enough temperature and welder operation skill required by welding of a weldment are not affected, the welding rods adopt alkaline welding rods, the alkaline welding rods need to be dried before welding, the drying temperature is 350-400 ℃, the heat preservation time is 1-2 hours, the welding rods need to be horizontally placed in layers during drying, the welding rods with the diameter of 3.2mm cannot exceed 5 layers at most, the welding rods with the diameter of 4mm cannot exceed 3 layers at most, the repeated drying times cannot exceed 3 times, the welding rods need to be taken at any time, the welding rods used during welding need to be placed in a heat preservation barrel, a direct current welding power supply and a polarity application alkaline welding rod need to be selected, and a direct current reverse polarity connection method needs to be adopted in order to improve the stability of welding arc combustion and reduce the generation of splashing and air holes.
4. The steel structure truss pipe column butting method according to claim 1, wherein the method comprises the following steps: the S3 welding process comprises the following steps: s3.1, processing a pipeline groove; s3.2, grouping; s3.3, positioning and welding; s3.4, preheating; s3.5, horizontally rotating and welding; meanwhile, the lowest allowable environment temperature during welding is specifically as follows:
carbon steel: -20 ℃;
low alloy steel, ordinary low alloy steel: -10 ℃;
medium and high alloy steel: 0 ℃ is used.
5. The steel structure truss pipe column butting method according to claim 4, wherein the method comprises the following steps: and the step S3.1 of processing the pipeline groove specifically comprises the following steps: the form and the size of the groove of the pipeline are required to be carried out according to the requirements specified by design documents, the groove is processed by adopting a mechanical processing method or a thermal processing method such as oxyacetylene (propane) cutting, oxide skin slag on the surface of the groove and a surface layer influencing the quality of a joint are removed after the groove is processed by adopting the thermal processing method, and the uneven part is polished to be smooth.
6. The steel structure truss pipe column butting method according to claim 4, wherein the method comprises the following steps: the S3.2 group is specifically as follows: before the assembly of the welding parts, the grooves and the inner and outer side surfaces of the grooves are not less than 10mm in range, such as oil, dirt, burrs and the like, are cleaned, and the inner wall is flush when the assembly of the butt-jointed pipes is carried out, so that the edge staggering can be avoided as far as possible (the edge staggering amount of the inner wall is not more than 10% of the thickness of the pipe wall and not more than 2 mm).
7. The steel structure truss pipe column butting method according to claim 4, wherein the method comprises the following steps: the S3.3 positioning welding specifically comprises the following steps: and (3) performing tack welding after the assembly is finished, wherein the length and the number of tack welding seams of the tack welding are different according to different pipe diameters, the position of the pipe diameter of more than 100mm is not less than 3, the length of the tack welding seam is 5-10mm when the pipe diameter is not more than 100mm, the length of the tack welding seam is more than 15mm when the pipe diameter is more than 100mm, and the tack welding seam is immediately cleared and repositioned if the defect is detected after the tack welding.
8. The steel structure truss pipe column butting method according to claim 4, wherein the method comprises the following steps: the preheating of S3.4 is specifically as follows: preheating before welding is required to meet the specification of a design file, generally, the preheating temperature is not lower than 200 ℃, the preheating width is not less than 3 times of the thickness of a weldment and not less than 50mm on each side by taking the center of a welding seam as a reference, and a contact type thermometer or a temperature measuring pen can be adopted in a temperature measuring mode;
the preheating method is preferably spot heating in principle, and when the conditions are not met, the flame heating method can be adopted.
9. The steel structure truss pipe column butting method according to claim 4, wherein the method comprises the following steps: s3.5 the horizontal rotation welding specifically comprises the following steps: the welding sequence is sequentially a priming layer, a filling layer and a cover layer;
a, priming layer: striking an arc on the surface of the groove, then striking the arc to a welding starting position, welding along a welding line after the truncated edge is melted through, and welding by adopting an arc breaking method;
b, filling layer: according to specific conditions, single-pass welding or multi-pass welding and continuous arc welding can be adopted;
c, covering the surface layer: the current used is slightly smaller, so as to keep the shape and size of the molten pool uniform, the included angle between the welding rod and the welding direction should be kept about 75 degrees, and the welding rod should be stopped slightly when swinging to the edge of the crevasse.
10. The steel structure truss tubular column butting method of claim 9, wherein: the jointing method of the cover surface layer comprises the following steps: slightly filling molten drop molten iron when the welding rod is changed for arc closing, quickly changing the welding rod, striking an arc at about 10mm before an arc pit, then withdrawing the arc to 2/3 of the arc pit, and normally welding after the arc pit is filled.
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| CN113319456A (en) * | 2021-05-24 | 2021-08-31 | 中国一冶集团有限公司 | Anti-crack welding method |
| CN114799709A (en) * | 2022-06-30 | 2022-07-29 | 海门市博洋铸造有限公司 | Steel structure truss pipe column butt joint method |
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| CN113319456A (en) * | 2021-05-24 | 2021-08-31 | 中国一冶集团有限公司 | Anti-crack welding method |
| CN114799709A (en) * | 2022-06-30 | 2022-07-29 | 海门市博洋铸造有限公司 | Steel structure truss pipe column butt joint method |
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