CN106180981A - The CO of super large caliber steel pipe2gas protection welding process - Google Patents
The CO of super large caliber steel pipe2gas protection welding process Download PDFInfo
- Publication number
- CN106180981A CN106180981A CN201610643456.9A CN201610643456A CN106180981A CN 106180981 A CN106180981 A CN 106180981A CN 201610643456 A CN201610643456 A CN 201610643456A CN 106180981 A CN106180981 A CN 106180981A
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- China
- Prior art keywords
- welding
- weld
- steel pipe
- preheating
- super large
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- 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
-
- 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
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
A kind of CO of super large caliber steel pipe2Gas protection welding process, comprises the steps: 1. to weld front preparation: by clean for the eliminating impurities in the range of all plan faces of weld and groove both sides each 50～100mm；2. tack welding: first preheat the steel pipe of welding, during tack welding centered by weld, is preheating in the range of steel tube head at least 150mm；And welding position should be away from end of welding bead 30 40mm, its length is at more than 50mm, and spacing is 130 160mm；3. weld preheating: first steel pipe seam is preheated, preheating temperature 100～150 DEG C, then carry out the temperature measuring of weld seam；4. the selection of welding parameter includes: gage of wire, arc voltage, speed of welding, the elongation of welding wire, current polarity, gas flow, post weld heat treatment parameter；5. steel-pipe welding: weld preheating, employing symmetrical welding；Welding direction by centre to both sides welding；Post weld heat treatment.The present invention is simple to operate, be completely embedded, and can reduce the generation of welding deformation and weld crack.
Description
Technical field
The present invention relates to the welding method of a kind of steel pipe, particularly to the CO of a kind of super large caliber steel pipe2Gas shielded arc welding
Connect technique.
Background technology
Long 12m, the above steel pipe of external diameter 3.22m weld at the scene, and the quality of its weld seam can be by environment, steel pipe docking port
The discrepancy in elevation and the restriction of displacement.At present, generally use manual metal-arc welding and submerged-arc welding, but both welding methods have following defects that
1, higher due to temperature, steel pipe is easy thermal expansion in welding process, causes occurring that after last docking uneven thermal expansion deforms,
Often such that steel pipe does not docks.2, longer due to steel pipe, deadweight is relatively big, there will be the most reciprocity discrepancy in elevation in welding process,
Thus cause weld cracking, even more so that pipe deformation., there is top overhead welding in 3, steel pipe seam circular arc docking, technical staff is very
The most complete difficult pipe end butt welding that completes works, as improper in controlled in welding process, easily causes docking port stress occur
Concentration causes nozzle distortion, the defective situation of crank detection test.
Summary of the invention
In order to solve problems of the prior art, the present invention provides the CO2 gas shield of a kind of super large caliber steel pipe
Welding procedure, this technological operation is simple, be completely embedded, and can reduce the generation of welding deformation and weld crack.
As above conceiving, the technical solution used in the present invention is as follows: the CO of a kind of super large caliber steel pipe2Gas shielded welding work
Skill, it is characterised in that: comprise the steps:
1. prepare before weldering: by clean for the eliminating impurities in the range of all plan faces of weld and groove both sides each 50～100mm；
2. tack welding: first preheat the steel pipe of welding, during tack welding centered by weld, away from steel tube head
Preheat in the range of at least 150mm；And welding position should be away from end of welding bead 30-40mm, its length in more than 50mm, spacing is
130-160mm；
3. weld preheating: before formal welding, first steel pipe seam is preheated, preheating temperature 100～150 DEG C, then
Carry out the temperature measuring of weld seam；
4. the selection of welding parameter includes: gage of wire, arc voltage, speed of welding, the elongation of welding wire, electric current pole
Property, gas flow, post weld heat treatment parameter；
5. steel-pipe welding: weld preheating, employing symmetrical welding；Welding direction by centre to both sides welding；Post weld heat treatment.
Above-mentioned tack welding uses carbon-dioxide arc welding.
The welding position thickness of above-mentioned tack welding is less than 1/2nd of formal weld bead height, less than 8mm.
Above-mentioned weld preheating uses the mode of electric heater to heat.
The temperature measuring width of above-mentioned weld seam is each 3 times of steel plate thickness scopes in weld seam both sides, and >=100mm, away from weld seam
Symmetrical measurement at each 50mm of centrage, every weld measurement point >=3 are right.
The present invention can improve the welding quality of super large caliber steel pipe, it is ensured that fastener for connection is firm, steel-pipe welding is indeformable.And
And method rationally, processing ease, construction operation difficulty can be reduced, improve efficiency of construction.
Accompanying drawing explanation
Fig. 1 is the groove type figure at pipe fitting two ends；
Fig. 2 is steel pipe circular seam welding sequence schematic diagram.
Detailed description of the invention
A kind of CO of super large caliber steel pipe2Gas protection welding process, thickness of steel pipe 22mm, outer diameter of steel pipes 3220mm, long
Degree 12m: comprise the following steps.
(1) prepare before weldering
Oxide skin, rust, greasy dirt and other foreign material in the range of all plan faces of weld and groove both sides each 50～100mm should be clear
Except clean, each layer of welding bead also should be cleared up after being soldered in time, can weld after passed examination again.
(2) tack welding
Tack welding uses carbon dioxide gas arc welding.First the steel pipe of welding is preheated, should be with weldering during tack welding
Centered by meeting place, should preheat in the range of steel tube head at least 150mm, welding position should be away from end of welding bead 35mm, its
Length should be at more than 50mm, and spacing is 150mm, thickness no more than 1/2nd of formal weld bead height, the thickest no more than
8mm。
(3) weld preheating
Before formal welding, first preheating steel pipe seam, preheating temperature 100～150 DEG C, weld preheating uses electricity to add
The mode of hot device heats, and the surface thermometer using supervisor to agree to measures temperature, and measuring width is each 3 times of weld seam both sides
Steel plate thickness scope, and not less than 100mm, at symmetrical measurement at each 50mm of axis of a weld, every weld measurement point should not
Right less than 3.
(4) selection of welding parameter includes: gage of wire, arc voltage, speed of welding, the elongation of welding wire, electric current pole
Property, gas flow, post weld heat treatment parameter
(5) selection of welding parameter
The first, the selection of gage of wire: for avoiding seam organization thick, impacts toughness and declines, it is necessary to use little rule
Model welds.The steel-pipe welding of this engineering selects the welding wire of 2.0mm, selects the mode of fine droplets transition to weld.
The second, arc voltage: optimal arc voltage is relevant with factors such as the size of electric current, positions.During the welding of steel pipe
The arc voltage selected is 40V.
3rd, speed of welding: speed of welding is too high, can destroy gas shield effect, and appearance of weld is bad, and weld seam is cooled
Hurry up, cause reducing plastic property of weld bead, toughness.Speed of welding is too low easily makes arc burn, forms thick seam organization.Speed of welding is selected
Use 20m/h.
4th, the elongation of welding wire: splash for reducing, make electrode extension less as far as possible, but with the increasing of welding current
Greatly, its extension elongation should suitably increase.20mm is selected during welding.
5th, current polarity: carbon dioxide gas arc welding mainly uses DC reverse connection method.
6th, gas flow: gas flow directly affects gas shield effect.18L/min is selected during steel-pipe welding.
7th, post weld heat treatment parameter: for reducing welding residual stress, reduce the hydrogen content in weld seam, improve weld seam
Metal structure and performance, answer butt welded seam to carry out heat treatment at postwelding.Heat treatment temperature is: 600 DEG C～640 DEG C, and constant temperature time is 2
Hour.
(6) steel-pipe welding
The first, weld preheating: before welding, first preheats, and constant temperature welded after 30 minutes.
The second, welding: for preventing welding deformation, use six people's symmetrical weldings, welding direction by centre to both sides welding.?
In welding during mouth, ground floor to the second layer must use little specification to weld, because its welding is affect welding deformation main
Reason.After the welding second layer terminates, the back side uses carbon arc air gouging back chipping, and back chipping must carry out mechanical beating by butt welded seam after terminating
Mill, the carburizing on trimming surface, expose metallic luster, prevent surface carbonation from effectively causing crackle.Collar extension point two-layer is soldered,
After the remainder of mouth in weldering again.When welding the second layer, welding direction should be in opposite direction with ground floor, by that analogy.Every layer
Welding point should stagger 15mm～20mm.
3rd, post weld heat treatment: welding point should carry out post weld heat treatment at postwelding within 12 hours.
4th, weld seam shortcoming processes and repair welding: the internal shortcoming of weld seam should use emery wheel or carbon arc air gouging method to remove, and repaiies
Wear into the groove beneficially welded.Should check before soldering, as lacked for crackle, then magnetic powder or permeating method should be used to detect,
Confirm that crackle has eliminated, can soldering.Tube wall surface pit depth is more than the 10% of thickness of slab or more than 2mm, should carry out soldering,
Before soldering, reconditioning pit is answered to be beneficial to welding, as preheated and after-baking.After soldering, should polish at soldering, check for splitting
Stricture of vagina.High-strength steel also should be carried out magnetic powder or Liquid penetrant testing, do not allow to there is crackle.
Claims (5)
1. the CO of a super large caliber steel pipe2Gas protection welding process, it is characterised in that: comprise the steps:
1. prepare before weldering: by clean for the eliminating impurities in the range of all plan faces of weld and groove both sides each 50～100mm；
2. tack welding: first preheat the steel pipe of welding, during tack welding centered by weld, away from steel tube head at least
Preheat in the range of 150mm；And welding position should be away from end of welding bead 30-40mm, its length is at more than 50mm, and spacing is 130-
160mm；
3. weld preheating: before formal welding, first steel pipe seam is preheated, preheating temperature 100～150 DEG C, then carry out
The temperature measuring of weld seam；
4. the selection of welding parameter includes: gage of wire, arc voltage, speed of welding, the elongation of welding wire, current polarity, gas
Body flow, post weld heat treatment parameter；
5. steel-pipe welding: weld preheating, employing symmetrical welding；Welding direction by centre to both sides welding；Post weld heat treatment.
The CO of super large caliber steel pipe the most according to claim 12Gas protection welding process, it is characterised in that: above-mentioned location
Weldering uses carbon-dioxide arc welding.
The CO of super large caliber steel pipe the most according to claim 12Gas protection welding process, it is characterised in that: above-mentioned location
The welding position thickness of weldering is less than 1/2nd of formal weld bead height, less than 8mm.
The CO of super large caliber steel pipe the most according to claim 12Gas protection welding process, it is characterised in that: before above-mentioned weldering
Preheating uses the mode of electric heater to heat.
The CO of super large caliber steel pipe the most according to claim 12Gas protection welding process, it is characterised in that: above-mentioned weld seam
Temperature measuring width be each 3 times of steel plate thickness scopes in weld seam both sides, and >=100mm, right at each 50mm of axis of a weld
Claiming to measure, every weld measurement point >=3 are right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643456.9A CN106180981A (en) | 2016-08-05 | 2016-08-05 | The CO of super large caliber steel pipe2gas protection welding process |
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|---|---|---|---|
| CN201610643456.9A CN106180981A (en) | 2016-08-05 | 2016-08-05 | The CO of super large caliber steel pipe2gas protection welding process |
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| CN106180981A true CN106180981A (en) | 2016-12-07 |
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| CN201610643456.9A Pending CN106180981A (en) | 2016-08-05 | 2016-08-05 | The CO of super large caliber steel pipe2gas protection welding process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735758A (en) * | 2017-01-03 | 2017-05-31 | 苏州长风航空电子有限公司 | A kind of two-way argon arc welding method for preventing from welding deformation |
| CN106895252A (en) * | 2017-03-10 | 2017-06-27 | 广州增立钢管结构股份有限公司 | A kind of steel pipe and its manufacture method with blocking magnetic conduction construction |
| CN107511566A (en) * | 2017-10-24 | 2017-12-26 | 徐州市华圆机械厂 | A kind of welding method for being heat-treated destressing |
| CN108907417A (en) * | 2018-07-20 | 2018-11-30 | 四川汇源钢建装配建筑有限公司 | A kind of steel plate interconnection method and welding steel |
| CN109332854A (en) * | 2018-11-30 | 2019-02-15 | 国家电网有限公司 | Technique suitable for penstock automatic welding high-intensitive in water-conveyance tunnel |
| CN110508954A (en) * | 2019-08-16 | 2019-11-29 | 江苏海力风电设备科技股份有限公司 | A kind of wind power foundation thin plate submerged-arc welding process |
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| CN101301699A (en) * | 2007-11-23 | 2008-11-12 | 鞍钢建设集团有限公司 | Large caliber aluminium alloy pipeline non-pad tungsten electrode argon arc single face welding and double face shaping method |
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| EP0205828A1 (en) * | 1985-06-10 | 1986-12-30 | Hoesch Aktiengesellschaft | Method and use of a steel for manufacturing steel pipes with a high resistance to acid gases |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735758A (en) * | 2017-01-03 | 2017-05-31 | 苏州长风航空电子有限公司 | A kind of two-way argon arc welding method for preventing from welding deformation |
| CN106895252A (en) * | 2017-03-10 | 2017-06-27 | 广州增立钢管结构股份有限公司 | A kind of steel pipe and its manufacture method with blocking magnetic conduction construction |
| CN107511566A (en) * | 2017-10-24 | 2017-12-26 | 徐州市华圆机械厂 | A kind of welding method for being heat-treated destressing |
| CN108907417A (en) * | 2018-07-20 | 2018-11-30 | 四川汇源钢建装配建筑有限公司 | A kind of steel plate interconnection method and welding steel |
| CN109332854A (en) * | 2018-11-30 | 2019-02-15 | 国家电网有限公司 | Technique suitable for penstock automatic welding high-intensitive in water-conveyance tunnel |
| CN110508954A (en) * | 2019-08-16 | 2019-11-29 | 江苏海力风电设备科技股份有限公司 | A kind of wind power foundation thin plate submerged-arc welding process |
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Application publication date: 20161207 |
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