CN101058139A - Welding technology for broken and waste core rod - Google Patents
Welding technology for broken and waste core rod Download PDFInfo
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- CN101058139A CN101058139A CN 200710057509 CN200710057509A CN101058139A CN 101058139 A CN101058139 A CN 101058139A CN 200710057509 CN200710057509 CN 200710057509 CN 200710057509 A CN200710057509 A CN 200710057509A CN 101058139 A CN101058139 A CN 101058139A
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Abstract
The invention relates to a broken core bar welding process that comprises the thread processing and extension, preheating and welding bar selection, heat treatment after the welding, rotary cooling and grinding. In the process of preheating and welding bar selection, it welds continuously at one time to maintain the temperature between layers. In after welding heat treatment, it is cooled gradually using heat insulating material covering the welding spot under working environment lower than 5deg.C. It uses broken core bar to weld into qualified core bar blank, after lathe processing to reach the durability of the imported ones. If there isn't any crack occur, it means that the welding has reached expectation. It reduces the imported core bar blank with reduced capital and improved productivity.
Description
Technical field
The present invention relates to the welding procedure of the utilization again, particularly a kind of broken and waste core rod of broken and waste core rod in the steel pipe's production.
Background technology
Plug is one of main warp tool of tube rolling factory retained mandrel tandem rolling tube machine, needs import as the employed plug of Φ 250MPM tandem rolling tube machine always, and is worth expensive.Rationally using plug, is one of important process that reduces production costs the service life of fully improving plug.
The grade of steel of plug material is X35CrMOVo5 H13, its chemical composition: (%)
C：0.30——0.38 Mn：0.60Max
Si：0.70——1.20 Cr：4.50——5.50
V：0.80——1.20 Mo：1.00———1.50
S：0.008Max S+P：0.02max
By calculating carbon equivalent C
EBe 1.88%, be higher than far away? 0.6%, the solderability extreme difference.
The working environment of plug: the plug after the graphite spraying, table is blown over borax in penetrating in advance, temperature is about in 1000～1200 ℃ the hollow billet, rolling through the roll-force that 7 frame height of tandem mill are different, roll-force reaches as high as 700 tons, rolling time 6～16 seconds, violent friction takes place in plug and hollow billet inwall simultaneously, maximum plug restraint power is 300 tons, with the plug appearance temperature of crossing up to 700 ℃ about, on the cooling stations rotating disc, cool off with 10 atmospheric cooling waters, temperature is reduced to 100 ± 20 ℃, drop into then and recycle, rhythm of production was from 27～51 seconds, and every plug is 214～408 seconds by rolling once more blanking time, and plug is exactly at this high temperature, high pressure repeatedly, suddenly cold and hot, the state of high frequency time is worked down.
Because plug vibrations or extension rod discount fatigue crack cause plug extension rod discount disconnected in the rolling process, plug can't disassemble after entering winding arbor extraction press, be forced to cut off, cause that six Φ, 291 pass plugs 9---10 meters long waste core rods can't use, these plugs of scrapping are very big wastes, for the plug that will scrap utilizes again, be a difficult problem of being badly in need of solution.
Summary of the invention
For solving the technical barrier that broken and waste core rod can't use, the purpose of this invention is to provide a kind of welding procedure of broken and waste core rod,
For achieving the above object, technical solution of the present invention provides a kind of welding procedure of broken and waste core rod, may further comprise the steps:
1. machining screw reaches to twist and connects
At first the disconnected mandrel-retracting machine of back segment is processed and be with the inclined to one side ladder lock post that is threaded, on the disconnected plug of leading portion, process the screwed hole that matches with the post that is threaded with inclined to one side ladder lock, and leaving escape, joint processes the bevel for welding of U type between disconnected plug of back segment and the disconnected plug of leading portion;
With the plug screw-on machine the disconnected plug of back segment and the disconnected plug of leading portion are carried out power and twist and connect, and make two sections disconnected plug root gaps 8---between the 10mm, can reach the root of disconnected plug, make the plug blank to guarantee welding rod;
2. weld preheating and selection welding rod weld
Hang on the rotary stand with overhead traveling crane twisting the plug blank connect, carry out weld preheating, bevel for welding both sides 300mm is heated to 300 ~ 350 ℃ temperature, at the uniform velocity heating, to guarantee heat penetration, it is inhomogeneous to prevent to heat too fast formation inner and outer temperatures;
Select to be fit to the welding rod of this material of welding, to carrying out the welding rod oven dry, prevent the generation of weld bond weld defect before the welding;
3. post weld heat treatment
Postwelding carries out temper to the plug blank, and temperature is greater than 350 ℃, is less than or equal to 550 ℃, is used for eliminating welding stress;
4. rotation cooling and reconditioning
On rotary stand, the plug blank is rotated cooling voluntarily, prevent the flexural deformation of plug blank; After treating the cooling of plug blank, with artificial method reconditioning, the weldering meat reconditioning that will be higher than mandrel surface with abrasive machine is put in order, and seamlessly transits with the plug body, is convenient to the machined into of back operation.
In 2. weld preheating and selecting in the step that welding rod welds of above-mentioned steps, selected welding rod is the welding rod of UTP68HH model, when welding, once welded uninterrupted, with the temperature between the maintenance weld layer.
3. in the post weld heat treatment, when operating ambient temperature is lower than 5 ℃, carry out slow cooling in above-mentioned steps with insulation material parcel weld bond.
Effect of the present invention is: adopt this technology that six disconnected useless plugs are welded into four qualified plug blanks altogether, become the finished product plug of two Φ 217.9 and two Φ 230.1 through machine tooling.And put into production use simultaneously with the import plug, all meet or exceed the service life of the import plug that uses together the same period its service life.Check that to the back of rolling off the production line weld bond is intact, defectives such as crackle do not occur, reached the set goal.By 85 yuans/Kg of 2005 plug blank import purchasing prices in the end of the year (containing tax), four plugs weigh 20488 kilograms altogether, can calculate economic benefit and be: 85 * 20488=1741480 unit.
Description of drawings
Fig. 1 connects schematic configuration diagram for plug;
Fig. 2 is processing process figure.
Among the figure:
1, the disconnected plug 2 of back segment, the disconnected plug 3 of leading portion, inclined to one side ladder lock screw thread
4, escape 5, U type bevel for welding
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated the welding procedure of broken and waste core rod of the present invention.
Broken and waste core rod structure after soldering is as shown in Figure 1, for guaranteeing no longer to take place aborning disconnected plug accident, and minimizing welding job amount, reduce rehabilitation cost, guarantee the straight degree of plug, the post 3 that at first the disconnected inclined to one side ladder lock of plug 1 machining band of back segment is threaded processes the screwed hole that matches with the post 3 that is threaded with inclined to one side ladder lock on the disconnected plug 2 of leading portion, and leaving escape 4, joint processes the bevel for welding 5 of U type between disconnected plug 1 of back segment and the disconnected plug 2 of leading portion.The benefit of U type groove is to save welding material, reduces welder's labour intensity.
With the plug screw-on machine the disconnected plug 1 of back segment and the disconnected plug 2 of leading portion are carried out power again and twist and connect, and guarantee that two sections root gaps are 8---between the 10mm, can reach the root of disconnected plug, reach the purpose of firm welding to guarantee welding rod.
The welding procedure of broken and waste core rod of the present invention may further comprise the steps as shown in Figure 2:
1. machining screw reaches to twist and connects
Post 3 at first is threaded the disconnected inclined to one side ladder lock of plug 1 machining band of back segment, on the disconnected plug 2 of leading portion, process the screwed hole that matches with the post 3 that is threaded with inclined to one side ladder lock, and leaving escape 4, joint processes the bevel for welding 5 of U type between disconnected plug 1 of back segment and the disconnected plug 2 of leading portion.With the plug screw-on machine the disconnected plug 1 of back segment and the disconnected plug 2 of leading portion are carried out power and twist and connect, and guarantee that two sections root gaps are 8---between the 10mm, can reach the root of disconnected plug, make the plug blank to guarantee welding rod.
2. weld preheating and selection welding rod weld
With twisting the length connect is that 15.3 meters plug blank hangs on the rotary stand with overhead traveling crane, carries out weld preheating.Bevel for welding both sides 300mm is heated to 300 ~ 350 ℃, and firing rate can not be too fast, evenly heating, and to guarantee heat penetration, it is inhomogeneous to prevent to heat too fast formation inner and outer temperatures.
Select to be fit to the welding rod of this material of welding, the welding rod trade mark of selection is the welding rod of UTP68HH model.The welding rod oven dry is carried out in the requirement of by specification before the welding, can not use the welding rod that makes moist, and prevents the generation of weld bond weld defect.
Will once weld after welding beginning, uninterrupted as far as possible (can be welded in turn by two welders) is to guarantee the temperature between weld layer.Simultaneously, guarantee that weld defects such as pore, slag inclusion, incomplete fusion cannot appear in welding quality.Preferably be chosen in environment temperature as far as possible than welding higher season.
3. post weld heat treatment
Postwelding carries out temper to the plug blank, and temperature is greater than 350 ℃, also can not be higher than 550 ℃, is used for eliminating welding stress.When operating ambient temperature is lower than 5 ℃, uses insulation material parcel weld bond and carry out slow cooling.
4. rotation cooling and reconditioning
On rotary stand, the plug blank is rotated cooling voluntarily, prevent the flexural deformation of plug blank.After treating the cooling of plug blank, with artificial method reconditioning.The weldering meat reconditioning that will be higher than mandrel surface with abrasive machine is put in order, and seamlessly transits with the plug body, is convenient to the machined into of back operation.
Claims (3)
1, a kind of welding procedure of broken and waste core rod may further comprise the steps:
1. machining screw reaches to twist and connects
Post (3) at first is threaded the disconnected inclined to one side ladder lock of plug (1) machining band of back segment, on the disconnected plug (2) of leading portion, process the screwed hole that matches with the post (3) that is threaded with inclined to one side ladder lock, and leaving escape (4), joint processes the bevel for welding (5) of (U) type between disconnected plug (1) of back segment and the disconnected plug (2) of leading portion;
With the plug screw-on machine the disconnected plug (1) of back segment and the disconnected plug (2) of leading portion are carried out power and twist and connect, and make two sections disconnected plug root gaps between 8-10mm, can reach the root of disconnected plug to guarantee welding rod, making plug blank;
2. weld preheating and selection welding rod weld
Hang on the rotary stand with overhead traveling crane twisting the plug blank connect, carry out weld preheating, bevel for welding both sides 300mm is heated to 300 ~ 350 ℃ temperature, at the uniform velocity heating, to guarantee heat penetration, it is inhomogeneous to prevent to heat too fast formation inner and outer temperatures;
Select to be fit to the welding rod of this material of welding, to carrying out the welding rod oven dry, prevent the generation of weld bond weld defect before the welding;
3. post weld heat treatment
Postwelding carries out temper to the plug blank, and temperature is greater than 350 ℃, is less than or equal to 550 ℃, is used for eliminating welding stress;
4. rotation cooling and reconditioning
On rotary stand, the plug blank is rotated cooling voluntarily, prevent the flexural deformation of plug blank; After treating the cooling of plug blank, with artificial method reconditioning, the weldering meat reconditioning that will be higher than mandrel surface with abrasive machine is put in order, and seamlessly transits with the plug body, is convenient to the machined into of back operation.
2, welding procedure according to claim 1, it is characterized in that: in 2. weld preheating and selecting in the step that welding rod welds of step, selected welding rod is the welding rod of UTP68HH model, has once welded uninterruptedly when welding, to keep the temperature between weld layer.
3, welding procedure according to claim 1 is characterized in that: 3. in the post weld heat treatment, when operating ambient temperature is lower than 5 ℃, carry out slow cooling with insulation material parcel weld bond in step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710057509XA CN100463768C (en) | 2007-05-31 | 2007-05-31 | Welding technology for broken and waste core rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710057509XA CN100463768C (en) | 2007-05-31 | 2007-05-31 | Welding technology for broken and waste core rod |
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| Publication Number | Publication Date |
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| CN101058139A true CN101058139A (en) | 2007-10-24 |
| CN100463768C CN100463768C (en) | 2009-02-25 |
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| CNB200710057509XA Active CN100463768C (en) | 2007-05-31 | 2007-05-31 | Welding technology for broken and waste core rod |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000892A (en) * | 2010-11-10 | 2011-04-06 | 强胜精密机械(苏州)有限公司 | Threaded hole machining tool and method for machining threaded hole |
| CN102817898A (en) * | 2012-08-30 | 2012-12-12 | 广东明阳风电产业集团有限公司 | Threaded hole and thread welding repair process |
| CN103753103A (en) * | 2013-12-23 | 2014-04-30 | 贵州盘江矿山机械有限公司 | Broken shaft repairing method |
| CN103846610A (en) * | 2012-12-05 | 2014-06-11 | 江苏南山冶金机械制造有限公司 | Core rod isometric restoration process |
| CN104646910A (en) * | 2014-06-14 | 2015-05-27 | 卢丽 | Pressing roller shaft journal abrasion repairing method |
| CN104801922A (en) * | 2014-01-26 | 2015-07-29 | 宝山钢铁股份有限公司 | Method for repairing fractured roller way spindle nose |
| CN110549068A (en) * | 2018-06-04 | 2019-12-10 | 天津高纳赛维科技有限公司 | Process method for equal-diameter repair of seamless steel tube core rod |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06182546A (en) * | 1992-12-16 | 1994-07-05 | Sumitomo Metal Ind Ltd | Welding of mandrel bar |
| JP2671757B2 (en) * | 1993-06-15 | 1997-10-29 | 住友金属工業株式会社 | Mandrel bar manufacturing method for seamless pipe manufacturing |
| US5839644A (en) * | 1994-04-08 | 1998-11-24 | Windle; John W. L. | Method of coupling and forming copper fittings with solder therein |
| CN2251448Y (en) * | 1996-04-22 | 1997-04-09 | 宝山钢铁(集团)公司 | Combined all floating long core rod |
-
2007
- 2007-05-31 CN CNB200710057509XA patent/CN100463768C/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000892A (en) * | 2010-11-10 | 2011-04-06 | 强胜精密机械(苏州)有限公司 | Threaded hole machining tool and method for machining threaded hole |
| CN102817898A (en) * | 2012-08-30 | 2012-12-12 | 广东明阳风电产业集团有限公司 | Threaded hole and thread welding repair process |
| CN102817898B (en) * | 2012-08-30 | 2015-11-11 | 广东明阳风电产业集团有限公司 | A kind of screw thread welding repair technology |
| CN103846610A (en) * | 2012-12-05 | 2014-06-11 | 江苏南山冶金机械制造有限公司 | Core rod isometric restoration process |
| CN103846610B (en) * | 2012-12-05 | 2016-09-07 | 江苏南山冶金机械制造有限公司 | The isometrical renovation technique of plug |
| CN103753103A (en) * | 2013-12-23 | 2014-04-30 | 贵州盘江矿山机械有限公司 | Broken shaft repairing method |
| CN104801922A (en) * | 2014-01-26 | 2015-07-29 | 宝山钢铁股份有限公司 | Method for repairing fractured roller way spindle nose |
| CN104646910A (en) * | 2014-06-14 | 2015-05-27 | 卢丽 | Pressing roller shaft journal abrasion repairing method |
| CN110549068A (en) * | 2018-06-04 | 2019-12-10 | 天津高纳赛维科技有限公司 | Process method for equal-diameter repair of seamless steel tube core rod |
| CN110549068B (en) * | 2018-06-04 | 2021-09-24 | 天津高纳赛维科技有限公司 | Process method for equal-diameter repair of seamless steel tube core rod |
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| Publication number | Publication date |
|---|---|
| CN100463768C (en) | 2009-02-25 |
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Effective date of registration: 20190628 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Steel Pipe Group Co., Ltd. |