CN106825876A - The welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material - Google Patents
The welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material Download PDFInfo
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- CN106825876A CN106825876A CN201710176311.7A CN201710176311A CN106825876A CN 106825876 A CN106825876 A CN 106825876A CN 201710176311 A CN201710176311 A CN 201710176311A CN 106825876 A CN106825876 A CN 106825876A
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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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
- B23K9/232—Arc welding or cutting taking account of the properties of the materials to be welded of different metals
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material, from the medicine core vapour shield welding wire welding of a diameter of Φ 1.2mm；The unfavorable factor that groove 20mm in region to be welded, removal surface scale, water and iron rust etc. are likely to result in weld defect is removed using abrasive machine before welding；In welding process, rational welding condition, including electric current, voltage, speed of welding and shield gas flow rate are selected, wherein for the test plate (panel) of 8mm≤δ thicknesss of slab≤16mm, can use the double V-groove with root face, 30 ° ± 5 of bevel angle.Welding method of the invention is simple, easy to operate, changes the pattern of groove, using internal groove structural shape, is easy to carbon arc air gouging, production efficiency is increased substantially, and cost is greatly lowered, 3 times of improving productivity, 3 times of cost of labor reduction, greatlys save production cost, creates considerable value.
Description
Technical field
The present invention relates to CO2 gas shielded arc welding technical fields, specially a kind of CO2 gases of large diameter pipeline foreign material
Protect the welding method of weldering.
Background technology
Currently, in petroleum chemical industry, due to its particularity, high temperature, heavy caliber, pressure are high, and designing institute calculates in pipeline
When considering cost the problems such as, it may appear that the welding of foreign material (Q235B+304) selection, because there is weldability in material,
Same material welding property excellent, welding dissimilar materials are poor, increase the difficulty of welding.Most of manufacturers are still using most former
The SMAW of beginning, although SMAW has no problem in welding quality, because pipe diameter is big, its low production efficiency
Under, hand labor high cost, welding material use quantity is big, production management high cost, is delayed delivery date, it is impossible to meet use requirement.
Such as use submerged-arc welding, although submerged-arc welding overall efficiency is high, function admirable, but because its weld heat input is larger,
HOT CRACK FOR WELDING P is also easy to produce in welding process, such as finds not in time, there is potential safety hazard to the use of product, currently without reasonable
Welding condition, and due to Q235B and the performance of 304 materials, cause appearance of weld unsightly, the de- slag difficulty of bottoming welding
Larger, flux restoring is not easy, and causes to waste, and increases production cost.
The content of the invention
It is an object of the invention to provide a kind of welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material,
To solve the problems, such as to be proposed in above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material, from the medicine core vapour of a diameter of Φ 1.2mm
Shield welding wire is welded；
Groove 20mm in region to be welded, removal surface scale, water and iron rust etc. are removed using abrasive machine before welding and is likely to result in weldering
Connect the unfavorable factor of defect；
In welding process, rational welding condition, including electric current, voltage, speed of welding and shield gas flow rate are selected, its
In test plate (panel) for 8mm≤δ thicknesss of slab≤16mm, can use the double V-groove with root face, 30 ° ± 5 of bevel angle；
During welding, using low current fast welding, weld heat input, weld heat input=electric current x voltages ÷ welderings can be efficiently controlled
Speed is connect, by the adjustment to main three welding parameters, the appearance of fire check in welding process can be effectively controlled, wherein
The electric current of welding（A）It is 160 ~ 200, voltage（V）It is 30 ~ 33, speed of welding（mm/s）It is 4.5 ~ 6.7, gas flow（L/min）
It is 20, gage of wire（mm）It is φ 1.2, electrode extension（mm）It is 10 ~ 15；
During welding, torch neck keeps 9 ~ 12 mm, welding gun to form 15 ° ~ 25 ° with workpiece vertical direction with workpiece, and welding terminates
When, the supply of delayed stopping CO2 gases；
During welding, arc portion position is received in weld seam, by the way of multiple spot welding, carry out arc crater and fill up, it is to avoid the outward appearance that arc crater is caused
It is unqualified, the appearance of solidification cracking；Weld reinforcement is effectively controlled in below 1.5mm, and appearance of weld is attractive in appearance, and connectivity is good；
When wind speed is less than -20 DEG C more than 2m/s, relative humidity more than 90%, sleet environment, weldment temperature, then forbid welding.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, welding method of the invention is simple, easy to operate, changes the pattern of groove, using internal groove structural shape, is easy to carbon arc
Gouge, production efficiency is increased substantially, and cost is greatly lowered, 3 times of improving productivity, 3 times of cost of labor reduction, is saved significantly
About production cost, creates considerable value；
2nd, using typical stainless steel welded method, low current rapid welding controls the heat input of welding, so as to ensure in welding
During be not in fire check；Traditional welding parameter can select larger parameter, ignore heat input, so as to cause fire check；
3rd, using Ultra-low carbon wlding, carbon is mainly considered（C）It is the main alloy element in steel, when phosphorus content increases, steel
Intensity, hardness significantly improve, and plasticity reduction；In welding process, carbon plays certain deoxidation, makees in high arc temperature
There is chemical combination with oxygen with lower, generate carbon monoxide and carbon dioxide, arc region and molten bath surrounding air are excluded, prevent
The harmful effect that oxygen only in air, nitrogen pernicious gas are produced to molten bath, reduces the content of oxygen and nitrogen in weld metal；If carbon containing
Amount is too high, and reduction acutely, can cause larger splashing and stomata.
Brief description of the drawings
Fig. 1 is groove schematic diagram of the invention；
Fig. 2 is to report schematic diagram using the tension test after present invention welding.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment 1
Fig. 1 is referred to, the present invention provides a kind of technical scheme：A kind of CO2 gas shielded arc weldings of large diameter pipeline foreign material
Welding method, from the medicine core vapour shield welding wire welding of a diameter of Φ 1.2mm；
Groove 20mm in region to be welded, removal surface scale, water and iron rust etc. are removed using abrasive machine before welding and is likely to result in weldering
Connect the unfavorable factor of defect；
In welding process, rational welding condition, including electric current, voltage, speed of welding and shield gas flow rate are selected, its
In test plate (panel) for 8mm≤δ thicknesss of slab≤16mm, can use the double V-groove with root face, 25 ° of bevel angle；
During welding, using low current fast welding, weld heat input, weld heat input=electric current x voltages ÷ welderings can be efficiently controlled
Speed is connect, by the adjustment to main three welding parameters, the appearance of fire check in welding process can be effectively controlled, wherein
The electric current of welding（A）It is 160, voltage（V）It is 30, speed of welding（mm/s）It is 4.5, gas flow（L/min）It is 20, welding wire is straight
Footpath（mm）It is φ 1.2, electrode extension（mm）It is 10；
During welding, torch neck keeps 15 ° of 9 mm, welding gun and workpiece vertical direction formation with workpiece, delayed to stop at the end of welding
The only supply of CO2 gases；
During welding, arc portion position is received in weld seam, by the way of multiple spot welding, carry out arc crater and fill up, it is to avoid the outward appearance that arc crater is caused
It is unqualified, the appearance of solidification cracking；Weld reinforcement is effectively controlled in below 1.5mm, and appearance of weld is attractive in appearance, and connectivity is good；
When wind speed is less than -20 DEG C more than 2m/s, relative humidity more than 90%, sleet environment, weldment temperature, then forbid welding.
CO2 gas shielded arc weldings of the invention are reduced to original 2 instead of SMAW, submerged-arc welding, welding material cost
Again, industry problem for a long time is solved, and is successfully carried out CO2 gas shielded arc weldings and apply to product, operation uses good.
Embodiment 2
A kind of welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material, from the medicine core vapour of a diameter of Φ 1.2mm
Shield welding wire is welded；
Groove 20mm in region to be welded, removal surface scale, water and iron rust etc. are removed using abrasive machine before welding and is likely to result in weldering
Connect the unfavorable factor of defect；
In welding process, rational welding condition, including electric current, voltage, speed of welding and shield gas flow rate are selected, its
In test plate (panel) for 8mm≤δ thicknesss of slab≤16mm, can use the double V-groove with root face, 35 ° of bevel angle；
During welding, using low current fast welding, weld heat input, weld heat input=electric current x voltages ÷ welderings can be efficiently controlled
Speed is connect, by the adjustment to main three welding parameters, the appearance of fire check in welding process can be effectively controlled, wherein
The electric current of welding（A）It is 200, voltage（V）It is 33, speed of welding（mm/s）It is 6.7, gas flow（L/min）It is 20, welding wire is straight
Footpath（mm）It is φ 1.2, electrode extension（mm）It is 15；
During welding, torch neck keeps 25 ° of 12 mm, welding gun and workpiece vertical direction formation with workpiece, delayed at the end of welding
Stop the supply of CO2 gases；
During welding, arc portion position is received in weld seam, by the way of multiple spot welding, carry out arc crater and fill up, it is to avoid the outward appearance that arc crater is caused
It is unqualified, the appearance of solidification cracking；Weld reinforcement is effectively controlled in below 1.5mm, and appearance of weld is attractive in appearance, and connectivity is good；
When wind speed is less than -20 DEG C more than 2m/s, relative humidity more than 90%, sleet environment, weldment temperature, then forbid welding.
Embodiment 3
A kind of welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material, from the medicine core vapour of a diameter of Φ 1.2mm
Shield welding wire is welded；
Groove 20mm in region to be welded, removal surface scale, water and iron rust etc. are removed using abrasive machine before welding and is likely to result in weldering
Connect the unfavorable factor of defect；
In welding process, rational welding condition, including electric current, voltage, speed of welding and shield gas flow rate are selected, its
In test plate (panel) for 8mm≤δ thicknesss of slab≤16mm, can use the double V-groove with root face, 35 ° of bevel angle；
During welding, using low current fast welding, weld heat input, weld heat input=electric current x voltages ÷ welderings can be efficiently controlled
Speed is connect, by the adjustment to main three welding parameters, the appearance of fire check in welding process can be effectively controlled, wherein
The electric current of welding（A）It is 180, voltage（V）It is 32, speed of welding（mm/s）It is 5, gas flow（L/min）It is 20, gage of wire
（mm）It is φ 1.2, electrode extension（mm）It is 12；
During welding, torch neck keeps 20 ° of 9 ~ 12 mm, welding gun and workpiece vertical direction formation with workpiece, stagnant at the end of welding
Stop the supply of CO2 gases afterwards；
During welding, arc portion position is received in weld seam, by the way of multiple spot welding, carry out arc crater and fill up, it is to avoid the outward appearance that arc crater is caused
It is unqualified, the appearance of solidification cracking；Weld reinforcement is effectively controlled in below 1.5mm, and appearance of weld is attractive in appearance, and connectivity is good；
When wind speed is less than -20 DEG C more than 2m/s, relative humidity more than 90%, sleet environment, weldment temperature, then forbid welding.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, it is possible to understand that
These embodiments can be carried out with various changes, modification, replacement without departing from the principles and spirit of the present invention and become
Type, the scope of the present invention be defined by the appended.
Claims (1)
1. a kind of welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material, it is characterised in that：From a diameter of Φ
The medicine core vapour shield welding wire welding of 1.2mm；
Groove 20mm in region to be welded, removal surface scale, water and iron rust etc. are removed using abrasive machine before welding and is likely to result in weldering
Connect the unfavorable factor of defect；
In welding process, rational welding condition, including electric current, voltage, speed of welding and shield gas flow rate are selected, its
In test plate (panel) for 8mm≤δ thicknesss of slab≤16mm, can use the double V-groove with root face, 30 ° ± 5 of bevel angle；
During welding, using low current fast welding, weld heat input, weld heat input=electric current x voltages ÷ welderings can be efficiently controlled
Speed is connect, by the adjustment to main three welding parameters, the appearance of fire check in welding process can be effectively controlled, wherein
The electric current of welding（A）It is 160 ~ 200, voltage（V）It is 30 ~ 33, speed of welding（mm/s）It is 4.5 ~ 6.7, gas flow（L/min）
It is 20, gage of wire（mm）It is φ 1.2, electrode extension（mm）It is 10 ~ 15；
During welding, torch neck keeps 9 ~ 12 mm, welding gun to form 15 ° ~ 25 ° with workpiece vertical direction with workpiece, and welding terminates
When, the supply of delayed stopping CO2 gases；
During welding, arc portion position is received in weld seam, by the way of multiple spot welding, carry out arc crater and fill up, it is to avoid the outward appearance that arc crater is caused
It is unqualified, the appearance of solidification cracking；Weld reinforcement is effectively controlled in below 1.5mm, and appearance of weld is attractive in appearance, and connectivity is good；
When wind speed is less than -20 DEG C more than 2m/s, relative humidity more than 90%, sleet environment, weldment temperature, then forbid welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710176311.7A CN106825876A (en) | 2017-03-23 | 2017-03-23 | The welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710176311.7A CN106825876A (en) | 2017-03-23 | 2017-03-23 | The welding method of the CO2 gas shielded arc weldings of large diameter pipeline foreign material |
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| CN106825876A true CN106825876A (en) | 2017-06-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161473A (en) * | 1974-11-27 | 1976-05-28 | Nippon Kokan Kk | Kosokukonoritsugasushiirudoaakuyosetsunyoru atsunikuteionyokochoryokukokanno seizoho |
| CN101508050A (en) * | 2009-02-20 | 2009-08-19 | 中冶实久建设有限公司南京分公司 | CO2 gas shielded welding method |
| CN104625352A (en) * | 2015-01-05 | 2015-05-20 | 云南昆钢新型复合材料开发有限公司 | Abrasion resistant steel and low-carbon steel dissimilar metal consumable electrode gas shielded welding technology |
| CN105108283A (en) * | 2015-08-10 | 2015-12-02 | 安徽富煌钢构股份有限公司 | Method for welding dissimilar steel plate of 45 steel and ZG275-485 steel |
| CN105562889A (en) * | 2015-12-25 | 2016-05-11 | 沪东重机有限公司 | Different-steel-grade welding process for stainless steel and weather-resistant steel and application of different-steel-grade welding process |
-
2017
- 2017-03-23 CN CN201710176311.7A patent/CN106825876A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161473A (en) * | 1974-11-27 | 1976-05-28 | Nippon Kokan Kk | Kosokukonoritsugasushiirudoaakuyosetsunyoru atsunikuteionyokochoryokukokanno seizoho |
| CN101508050A (en) * | 2009-02-20 | 2009-08-19 | 中冶实久建设有限公司南京分公司 | CO2 gas shielded welding method |
| CN104625352A (en) * | 2015-01-05 | 2015-05-20 | 云南昆钢新型复合材料开发有限公司 | Abrasion resistant steel and low-carbon steel dissimilar metal consumable electrode gas shielded welding technology |
| CN105108283A (en) * | 2015-08-10 | 2015-12-02 | 安徽富煌钢构股份有限公司 | Method for welding dissimilar steel plate of 45 steel and ZG275-485 steel |
| CN105562889A (en) * | 2015-12-25 | 2016-05-11 | 沪东重机有限公司 | Different-steel-grade welding process for stainless steel and weather-resistant steel and application of different-steel-grade welding process |
Non-Patent Citations (2)
| Title |
|---|
| 孙树叶等: "Q690E与Q345E异种钢焊接力学性能的研究", 《热加工工艺》 * |
| 许骥等: "船用20钢与316L不锈钢的一种钢管焊接工艺", 《船海工程》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170613 |
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