CN105364427A - Preparation method of straight-seam high-frequency welded tube - Google Patents
Preparation method of straight-seam high-frequency welded tube Download PDFInfo
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- CN105364427A CN105364427A CN201510948048.XA CN201510948048A CN105364427A CN 105364427 A CN105364427 A CN 105364427A CN 201510948048 A CN201510948048 A CN 201510948048A CN 105364427 A CN105364427 A CN 105364427A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a preparation method of a straight-seam high-frequency welded tube. The preparation method comprises the following steps: 1, forming a hot rolled plate; 2, conducting extrusion; 3, conducting welding; 4, conducting cooling treatment; 5, conducting normalizing treatment; 6, conducting inspection and confirming that a weld joint of a tube body is free of crack and burr defects, making marks, and warehousing the tube. According to the preparation method of the straight-seam high-frequency welded tube, through the reasonable extrusion allowance design and a high frequency welding process, the prepared straight-seam high-frequency welded tube can have an excellent weld structure, overall performance of the welded tube is excellent, welding quality is high, and efficiency is high.
Description
Technical field
The present invention relates to steel pipe preparing technical field, particularly relate to a kind of preparation method of straight seam high frequency welding pipe.
Background technology
Welded still pipe utilizes steel plate or steel belt molding to be welded, and its level of production is the mark of welded still pipe technological progress and product quality level.Compared with seamless steel pipe, the advantage of welded still pipe is: dimensional accuracy is higher, surface quality is better, lumber recovery is higher, overall energy consumes less, be suitable for producing in enormous quantities, cost, also lower than seamless steel pipe, has stronger competitiveness and good development prospect.
The prior welding mode of welded still pipe adopts the vacuum tube source of welding current to weld, there is the shortcoming of weldquality difference in this welding manner, as more in weld seam inner burr, longer, usually needs internally outer welding bead to carry out processing and shaping again, reduce welding efficiency, also affect the total quality of welded tube.
The high-frequency induction welding technique adopting the High Frequency Solid State source of welding current to carry out is the new and effective welding method that development in recent years is got up, it is compared with vacuum tube welding machine, possess the features such as more effective, safer, tubulation quality is higher radio-frequency power supply, be widely used in steel pipe manufacture, the application especially in industrial gas oil more and more widely.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of preparation method of straight seam high frequency welding pipe, and the High Frequency Solid State source of welding current can be utilized to weld out high-quality vertical masonry joint Q460E steel pipe.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the preparation method providing a kind of straight seam high frequency welding pipe, comprises the steps:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, carries out slitting after being unreeled by hot-rolled coil by high-frequency welding surplus, obtains single welded pipe blank;
(2) extrude: with extruder, the blank after shearing in step (1) is squeezed into pipe;
(3) weld: utilize the High Frequency Solid State source of welding current materials in the tube after extruding in step (2) to be welded at seam crossing under certain welding condition, make it to become welding body;
(4) cooling processing: rolled off the production line by the body after welding in step (3), is placed in body quickly cooling device butt welded seam and carries out pressure cooling;
(5) normalized treatment: normalized treatment is carried out in the ratio-frequency welding adapter heating after cooling processing in step (4);
(6) body commissure flawless, veining defect is checked, mark warehouse-in.
In a preferred embodiment of the present invention, in described step (1), described high-frequency welding surplus is 5 ~ 5.5mm.
In a preferred embodiment of the present invention, in described step (3), described welding condition is: speed of welding 16 ~ 20m/min, weld seam amount of compression 4.8 ~ 5.3mm, bonding power 500 ~ 600kW, electric current 12 ~ 15A.
In a preferred embodiment of the present invention, in described step (3), the described method of cooling of forcing is: the body outside the 5cm of butt welded seam both sides carries out water-cooled cooling, makes weld seam be cooled to 450 ~ 500 DEG C with the speed of 50 ~ 80 DEG C/min, then Air flow to 300 DEG C, is carrying out water-cooled completely.
In a preferred embodiment of the present invention, in described step (4), the method for described normalized treatment is: be first heated to 1000 ~ 1300 DEG C, then cool to room temperature with the furnace.
The invention has the beneficial effects as follows: the preparation method of a kind of straight seam high frequency welding pipe of the present invention, designed and high-frequency induction welding technique by rational extruding allowance, make prepared vertical masonry joint high-frequency welding pipe have excellent seam organization, welded tube overall performance is excellent, welding quality is high, and efficiency is fast.
Detailed description of the invention
Below preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
The embodiment of the present invention comprises:
Embodiment 1
Present invention is disclosed a kind of preparation method of straight seam high frequency welding pipe, the material of this welded still pipe is Q460E mild steel, and its specification is: diameter 30mm, wall thickness 8mm, and concrete steps are:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, carries out slitting after being unreeled by hot-rolled coil by the specification of high-frequency welding surplus 5 ~ 5.5mm, obtains single welded pipe blank;
(2) extrude: adopt template adjustment size rolls, correct roll location, with extruder, the blank after middle for step (1) shearing is squeezed into pipe, obtains good pipe shape;
(3) weld: utilize the High Frequency Solid State source of welding current materials in the tube after extruding in step (2) to be welded at seam crossing, make it to become straight seam welding body; Described welding condition is: speed of welding 20m/min, weld seam amount of compression 5.3mm, bonding power 600kW, electric current 15A;
(4) cooling processing: the body after welding in step (3) is rolled off the production line, be placed in body quickly cooling device butt welded seam and carry out pressure cooling, the method of concrete cooling is: the described method of cooling of forcing is: the body outside the 5cm of butt welded seam both sides carries out water-cooled cooling, weld seam is made to be cooled to 450 ~ 500 DEG C with the speed of 50 ~ 80 DEG C/min, then Air flow to 300 DEG C, is carrying out water-cooled completely;
(5) normalized treatment: the ratio-frequency welding adapter after cooling processing in step (4) is continued to be heated to 1300 DEG C, then cools to room temperature with the furnace, carry out normalized treatment, to improve the low-temperature flexibility of welded still pipe, prevent welded pipe from occurring rift defect;
(6) body commissure flawless, veining defect is checked, mark warehouse-in.
Embodiment 2
Present invention is disclosed a kind of preparation method of straight seam high frequency welding pipe, the material of this welded still pipe is Q460E mild steel, and its specification is: diameter 35mm, wall thickness 6mm, and concrete steps are:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, carries out slitting after being unreeled by hot-rolled coil by the specification of high-frequency welding surplus 5 ~ 5.5mm, obtains single welded pipe blank;
(2) extrude: adopt template adjustment size rolls, correct roll location, with extruder, the blank after middle for step (1) shearing is squeezed into pipe, obtains good pipe shape;
(3) weld: utilize the High Frequency Solid State source of welding current materials in the tube after extruding in step (2) to be welded at seam crossing, make it to become straight seam welding body; Described welding condition is: speed of welding 16m/min, weld seam amount of compression 4.8mm, bonding power 500kW, electric current 12A;
(4) cooling processing: the body after welding in step (3) is rolled off the production line, be placed in body quickly cooling device butt welded seam and carry out pressure cooling, the method of concrete cooling is: the body of butt welded seam both sides carries out water-cooled cooling, makes weld seam be cooled to 500 DEG C with the speed of 50 DEG C/min;
(5) normalized treatment: the ratio-frequency welding adapter after cooling processing in step (4) is continued to be heated to 1000 DEG C, then cools to room temperature with the furnace, carry out normalized treatment, to improve the low-temperature flexibility of welded still pipe, prevent welded pipe from occurring rift defect;
(6) body commissure flawless, veining defect is checked, mark warehouse-in.
Body prepared by said method has fine ferrite and the pearlite seam organization of function admirable.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a preparation method for straight seam high frequency welding pipe, is characterized in that, comprises the steps:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, carries out slitting after being unreeled by hot-rolled coil by high-frequency welding surplus, obtains single welded pipe blank;
(2) extrude: with extruder, the blank after shearing in step (1) is squeezed into pipe;
(3) weld: utilize the High Frequency Solid State source of welding current materials in the tube after extruding in step (2) to be welded at seam crossing under certain welding condition, make it to become welding body;
(4) cooling processing: rolled off the production line by the body after welding in step (3), is placed in body quickly cooling device butt welded seam and carries out pressure cooling;
(5) normalized treatment: normalized treatment is carried out in the ratio-frequency welding adapter heating after cooling processing in step (4);
(6) body commissure flawless, veining defect is checked, mark warehouse-in.
2. the preparation method of vertical masonry joint ratio-frequency welding adapter according to claim 1, it is characterized in that, in described step (1), described high-frequency welding surplus is 5 ~ 5.5mm.
3. the preparation method of vertical masonry joint ratio-frequency welding adapter according to claim 1, it is characterized in that, in described step (3), described welding condition is: speed of welding 16 ~ 20m/min, weld seam amount of compression 4.8 ~ 5.3mm, bonding power 500 ~ 600kW, electric current 12 ~ 15A.
4. the preparation method of vertical masonry joint ratio-frequency welding adapter according to claim 1, it is characterized in that, in described step (3), the described method of cooling of forcing is: the body outside the 5cm of butt welded seam both sides carries out water-cooled cooling, weld seam is made to be cooled to 450 ~ 500 DEG C with the speed of 50 ~ 80 DEG C/min, then Air flow to 300 DEG C, is carrying out water-cooled completely.
5. the preparation method of vertical masonry joint ratio-frequency welding adapter according to claim 1, it is characterized in that, in described step (4), the method for described normalized treatment is: be first heated to 1000 ~ 1300 DEG C, then cool to room temperature with the furnace.
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| CN201510948048.XA CN105364427A (en) | 2015-12-17 | 2015-12-17 | Preparation method of straight-seam high-frequency welded tube |
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| CN201510948048.XA CN105364427A (en) | 2015-12-17 | 2015-12-17 | Preparation method of straight-seam high-frequency welded tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107169167A (en) * | 2017-04-18 | 2017-09-15 | 燕山大学 | A kind of analogy method to ERW steel-pipe welding process burr form dynamic simulations |
| CN110142310A (en) * | 2019-05-31 | 2019-08-20 | 常熟市盈博钢管有限公司 | A kind of production technology of steel pipes with straight |
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| KR100651774B1 (en) * | 2005-12-26 | 2006-12-01 | 주식회사 포스코 | Method of manufacturing the electric resistance welded pipe for excellent hic resistance and low temperature toughness |
| CN101885136A (en) * | 2010-06-25 | 2010-11-17 | 无锡天龙钢管有限公司 | Production process of special steel pipe for air-conditioning compressor casing |
| CN102312075A (en) * | 2010-06-29 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Method for improving low-temperature impact toughness of weld joint of weld pipe welded in manner of high-frequency straight welding |
| CN102642123A (en) * | 2012-04-28 | 2012-08-22 | 宝山钢铁股份有限公司 | Manufacturing process of ultra-low carbon X42 steel grade high frequency straight welding tube |
| CN103266282A (en) * | 2013-05-28 | 2013-08-28 | 宝山钢铁股份有限公司 | L415MB steel grade high frequency longitudinal welded pipe and manufacturing method thereof |
| CN104842128A (en) * | 2015-06-08 | 2015-08-19 | 武汉钢铁(集团)公司 | Ultrahigh radius-thickness ratio high-frequency longitudinal-seam welded pipe manufacturing method |
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2015
- 2015-12-17 CN CN201510948048.XA patent/CN105364427A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100651774B1 (en) * | 2005-12-26 | 2006-12-01 | 주식회사 포스코 | Method of manufacturing the electric resistance welded pipe for excellent hic resistance and low temperature toughness |
| CN101885136A (en) * | 2010-06-25 | 2010-11-17 | 无锡天龙钢管有限公司 | Production process of special steel pipe for air-conditioning compressor casing |
| CN102312075A (en) * | 2010-06-29 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Method for improving low-temperature impact toughness of weld joint of weld pipe welded in manner of high-frequency straight welding |
| CN102642123A (en) * | 2012-04-28 | 2012-08-22 | 宝山钢铁股份有限公司 | Manufacturing process of ultra-low carbon X42 steel grade high frequency straight welding tube |
| CN103266282A (en) * | 2013-05-28 | 2013-08-28 | 宝山钢铁股份有限公司 | L415MB steel grade high frequency longitudinal welded pipe and manufacturing method thereof |
| CN104842128A (en) * | 2015-06-08 | 2015-08-19 | 武汉钢铁(集团)公司 | Ultrahigh radius-thickness ratio high-frequency longitudinal-seam welded pipe manufacturing method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107169167A (en) * | 2017-04-18 | 2017-09-15 | 燕山大学 | A kind of analogy method to ERW steel-pipe welding process burr form dynamic simulations |
| CN110142310A (en) * | 2019-05-31 | 2019-08-20 | 常熟市盈博钢管有限公司 | A kind of production technology of steel pipes with straight |
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