CN105643123A - Q325A steel pipe tailor-welding process - Google Patents
Q325A steel pipe tailor-welding process Download PDFInfo
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- CN105643123A CN105643123A CN201410721585.6A CN201410721585A CN105643123A CN 105643123 A CN105643123 A CN 105643123A CN 201410721585 A CN201410721585 A CN 201410721585A CN 105643123 A CN105643123 A CN 105643123A
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Abstract
The invention discloses a Q325A steel pipe tailor-welding process. The welding process is characterized by comprising the following steps: (1) the preparation is performed; (2) the welding sequence and the welding process parameters are obtained; (3) preheated steel pipes are welded; and (4) the heat preservation is performed on the steel pipes by insulation cottons after welding; and the steel pipes are put in an insulation box for insulation slow cooling for 10-12 hours. The Q325A steel pipe tailor-welding process improves the welding quality and the product quality and prolongs the service life through strict process parameter control.
Description
Technical field
The invention belongs to weldprocedure field, specifically the steel pipe butt welding process of a kind of Q325A.
Background technology
Q325A steel pipe butt welding process, its welding distortion is theoretical it will be seen that the principal element affecting welding distortion size is: weld size is more big, and deposited metal is more many, is out of shape more big; When weld size is equal, weld seam heat input is more big, and the distortion caused is also more big; When welding greatly enhances weld seam, segmentation is less than straight-through weldering distortion; Though weld seam arranges asymmetric or symmetrical arrangement but asymmetric welding, the deviation of weld seam position is more serious, is out of shape more big; Component rigidity is more little, is out of shape more big, therefore the extremely difficult control of welding distortion. The primary deformable of welding has that flexure (just curved), side are curved, angular distortion and distortion distortion etc. For this rectangular pipe, main distortion is transverse contraction, and rectangular cross-section size is affected, and every limit needs indentation preset clearance about 90%; After weld seam transverse contraction, perpendicular plate inward at both ends bends, and makes component form waist drum shape; Owing to weld seam section is big, input heat is many, bigger longitudinal direction must be caused to shrink, make component form deflection deformation at length direction; To the distortion distortion caused because of unreasonable welding, correct very difficult, sometimes have to cut open and reweld or one integral piece is scrapped.
Summary of the invention
It is an object of the invention to for Shortcomings part in above-mentioned technology, the present invention provides the steel pipe butt welding process of a kind of Q325A, can improve welding quality, it is to increase product quality, extends work-ing life.
The technical scheme realizing the object of the invention is as follows:
The steel pipe butt welding process of a kind of Q325A, it is characterised in that, its weldprocedure comprises the following steps:
(1) preparation work: in situ temperature lower than 5 DEG C, higher than 35 DEG C, can not can not remove the zone of oxidation within the scope of welding wire surface and bevel for welding and each 25mm in both sides thereof, greasy dirt, moisture, corrosion impurity before weldering;
(2) welding sequence and welding condition: execute tack welding, welding position is evenly distributed on pipe body both sides, welding bead length 10-15mm, spot welding place must not have crackle, arc crater, gas hole defect, preheating before welding, carrying out even preheating with oxy-acetylene grilled gun in the 80-100mm welding region of pipe body one end, warm contact type thermometric indicator measures Heating temperature, is heated to 240-260 DEG C;
(3) preheated steel pipe welds: the rotating speed 25rad/min that during welding first weld seam, workpiece rotates, and weld interval, both sides swung welding gun, ensures that butt weld both sides coordinate; Weld face medicine skin, welding slag are removed in polishing; Workpiece rotational frequency 18rad/min during welding second weld seam, it may also be useful to after grilled gun heats, detection interlayer temperature, ensures that temperature is welded in 240-260 DEG C of interval;The starting point of second weld seam should stagger on 50mm-60mm with first welding line joint position; When welding the 3rd road weld seam, rotating speed is 15rad/min, it may also be useful to after grilled gun heats, detection interlayer temperature, ensures that temperature is welded in 240-260 DEG C of interval, and the starting point of the 3rd road weld seam should stagger on 50mm-60mm with second welding line joint position;
(4) steel pipe is incubated by insulating cotton after having welded, and puts into insulation can, carries out the insulation slow cooling of 10-12 hour.
The steel pipe butt welding process of a kind of Q325A of the present invention, by strict process parameter control, it is to increase welding quality, it is to increase product quality, extends work-ing life.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
A steel pipe butt welding process of Q325A, its weldprocedure comprises the following steps:
(1) preparation work: in situ temperature 25 DEG C, removes the zone of oxidation within the scope of welding wire surface and bevel for welding and each 25mm in both sides thereof, greasy dirt, moisture, corrosion impurity before weldering;
(2) welding sequence and welding condition: execute tack welding, welding position is evenly distributed on pipe body both sides, welding bead length 12mm, spot welding place must not have crackle, arc crater, gas hole defect, preheating before welding, carrying out even preheating with oxy-acetylene grilled gun in the 85mm welding region of pipe body one end, warm contact type thermometric indicator measures Heating temperature, is heated to 250 DEG C;
(3) preheated steel pipe welds: the rotating speed 25rad/min that during welding first weld seam, workpiece rotates, and weld interval, both sides swung welding gun, ensures that butt weld both sides coordinate; Weld face medicine skin, welding slag are removed in polishing; Workpiece rotational frequency 18rad/min during welding second weld seam, it may also be useful to after grilled gun heats, detection interlayer temperature, ensures that temperature is welded in 250 DEG C of intervals; The starting point of second weld seam should stagger on 55mm with first welding line joint position; When welding the 3rd road weld seam, rotating speed is 15rad/min, it may also be useful to after grilled gun heats, detection interlayer temperature, ensures that temperature is welded in 255 DEG C of intervals, and the starting point of the 3rd road weld seam should stagger on 55 with second welding line joint position;
(4) steel pipe is incubated by insulating cotton after having welded, and puts into insulation can, carries out the insulation slow cooling of 11 hours.
The steel pipe butt welding process of a kind of Q325A of the present invention, by strict process parameter control, it is to increase welding quality, it is to increase product quality, extends work-ing life.
Below the preferred embodiment of the present invention is described in detail. It is to be understood that the those of ordinary skill of this area just can make many modifications and variations according to the design of the present invention without the need to creative work. The technical scheme that all technician in the art can be obtained by logical analysis, reasoning, or a limited experiment under this invention's idea on the basis of existing technology, all should by the determined protection domain of claim book.
Claims (1)
1. the steel pipe butt welding process of a Q325A, it is characterised in that, its weldprocedure comprises the following steps:
(1) preparation work: in situ temperature lower than 5 DEG C, higher than 35 DEG C, can not can not remove the zone of oxidation within the scope of welding wire surface and bevel for welding and each 25mm in both sides thereof, greasy dirt, moisture, corrosion impurity before weldering;
(2) welding sequence and welding condition: execute tack welding, welding position is evenly distributed on pipe body both sides, welding bead length 10-15mm, spot welding place must not have crackle, arc crater, gas hole defect, preheating before welding, carrying out even preheating with oxy-acetylene grilled gun in the 80-100mm welding region of pipe body one end, warm contact type thermometric indicator measures Heating temperature, is heated to 240-260 DEG C;
(3) preheated steel pipe welds: the rotating speed 25rad/min that during welding first weld seam, workpiece rotates, and weld interval, both sides swung welding gun, ensures that butt weld both sides coordinate; Weld face medicine skin, welding slag are removed in polishing; Workpiece rotational frequency 18rad/min during welding second weld seam, it may also be useful to after grilled gun heats, detection interlayer temperature, ensures that temperature is welded in 240-260 DEG C of interval; The starting point of second weld seam should stagger on 50mm-60mm with first welding line joint position; When welding the 3rd road weld seam, rotating speed is 15rad/min, it may also be useful to after grilled gun heats, detection interlayer temperature, ensures that temperature is welded in 240-260 DEG C of interval, and the starting point of the 3rd road weld seam should stagger on 50mm-60mm with second welding line joint position;
(4) steel pipe is incubated by insulating cotton after having welded, and puts into insulation can, carries out the insulation slow cooling of 10-12 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410721585.6A CN105643123A (en) | 2014-12-03 | 2014-12-03 | Q325A steel pipe tailor-welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410721585.6A CN105643123A (en) | 2014-12-03 | 2014-12-03 | Q325A steel pipe tailor-welding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105643123A true CN105643123A (en) | 2016-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410721585.6A Pending CN105643123A (en) | 2014-12-03 | 2014-12-03 | Q325A steel pipe tailor-welding process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110883404A (en) * | 2019-12-25 | 2020-03-17 | 唐山松下产业机器有限公司 | Welding process |
| CN112342360A (en) * | 2020-09-29 | 2021-02-09 | 无锡欣鼎金属制品有限公司 | Heating method of special steel pipe |
-
2014
- 2014-12-03 CN CN201410721585.6A patent/CN105643123A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110883404A (en) * | 2019-12-25 | 2020-03-17 | 唐山松下产业机器有限公司 | Welding process |
| CN110883404B (en) * | 2019-12-25 | 2021-09-17 | 唐山松下产业机器有限公司 | Welding process |
| CN112342360A (en) * | 2020-09-29 | 2021-02-09 | 无锡欣鼎金属制品有限公司 | Heating method of special steel pipe |
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Application publication date: 20160608 |