CN101352785A - Method for welding pressing sleeve of large-sized hydraulic press - Google Patents
Method for welding pressing sleeve of large-sized hydraulic press Download PDFInfo
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- CN101352785A CN101352785A CNA2007100939823A CN200710093982A CN101352785A CN 101352785 A CN101352785 A CN 101352785A CN A2007100939823 A CNA2007100939823 A CN A2007100939823A CN 200710093982 A CN200710093982 A CN 200710093982A CN 101352785 A CN101352785 A CN 101352785A
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Abstract
The invention discloses a method for welding a pressing sleeve of a large oil press. The following steps are adopted to carry out welding: step one, processing the groove of a welding line; step two, assembling; connecting and fixing a forgeable piece by a connection board; step three, pre-heating; heating the area of the welding line; step four, adopting gas shielded welding to carry out backing weld; step five, manually welding; step six, removing the connection board; step seven, welding; a common submerged arc welding machine matched with an ultra-long current contact nozzle carries out welding based on the manual welding; carries out welding continuously until the groove is fully welded; step eight, welding and post heating; step nine, coping the welding line; step ten, inspecting; step eleven, processing the profile; step twelve, heat processing. The method carry out welding on the jointing welding line of the annular line of the deep groove of a material of 20MnMoNb, which leads a single-surface welding back-shaping technique to be successfully applied to the butt welding of the annular line of the deep groove.
Description
Technical field
The present invention relates to a kind of welding method, be specifically related to a kind of welding method of pressing sleeve of large-sized hydraulic press.
Background technology
Gland is the crucial stressed member of hydraulic press.The forging assembly welding that it is 20MnMoNb that the employed gland of the 165MN hydraulic press of developing at present the biggest in the world adopts six materials forms, and as shown in Figure 1, in order to process and convenient welding, each forging is all done circular, comprises two ends spindle nose and four cylindrical shells altogether.Six forging are grown up 16.88 meters by five weld seam assembly weldings, and the circular abutment that diameter is 1.67 meters, postwelding are reprocessed into square gland.This gland blank weighs 186 tons, and bevel for welding reaches 385mm deeply.Its overall dimensions, single-piece groove depth heavy, that adopted all are maximum in present this series products.
Because the forging material is 20MnMoNb, must be preheated to 200～250 ℃ high temperature in welding process, therefore, the welder can't weld and carry out operations such as carbon arc air gouging back chipping in forging inside, then can't remove liner as the method that employing adds the cushions, so can only adopt single welding negative shape technology.And existing single welding negative shape technology generally adopts stick electrode or argon arc TIG welding, because groove is too dark, can't operate.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of welding method of pressing sleeve of large-sized hydraulic press, and this method can be that the deep groove circumferential weld of 20MnMoNb carries out the butt weld welding to material.
For solving the problems of the technologies described above, the technical solution of the welding method of pressing sleeve of large-sized hydraulic press of the present invention is: carry out according to the following steps:
The first step is at commissure processing U type groove; The groove angle is 6～24 °, and the groove bottom is the circular arc transition, and arc radius is 6～8mm, and groove root height is 0～1mm, and groove minimum clearance is 0～2mm;
Second step, assembling; Making needs the forging of butt welding to align by inside and outside footpath, and adopts connecting plate to fix; Fixed form adopts welding, during welding welding gun is preheated to 200～250 ℃;
The 3rd step, preheating; Heat in the butt welded seam district, and heating-up temperature is 200～250 ℃;
The 4th step, backing welding; Adopt gas to protect weldering and carry out backing welding; Adopt the electric peculiar gas shiled electric welding machine Power Wave 455M/STT source of welding current of U.S. Lincoln, gas adopts argon-rich gas, and promptly composition is 75%Ar and 25%CO
2Gas, under the STT pattern, weld;
The 5th step, manual welding; On the basis of back welding, carry out manual welding, weld 2～3 layers;
In the 6th step, remove connecting plate;
The 7th step, welding; Adopt common submerged arc welding machine to join the overlength ignition tip, on the basis of manual welding, weld, continuous sequence, the full groove of weldering;
The 8th step, the welding after heat.
The technique effect that the present invention can reach is: can realize to material being that the deep groove circumferential weld of 20MnMoNb carries out the butt weld welding, make single welding negative shape technology can be successfully applied to the butt welding of deep groove circumferential weld.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the schematic diagram of gland;
Fig. 2 is the schematic diagram of weld groove;
Fig. 3 is the coordinate diagram of time and temperature in the heat treatment process;
Fig. 4 is the flow chart of the welding method of pressing sleeve of large-sized hydraulic press of the present invention.
The specific embodiment
As shown in Figure 4, the welding method of pressing sleeve of large-sized hydraulic press is carried out according to the following steps:
The first step, finished edge; Adopt the machining mode, at the commissure of forging processing U type groove, divided edge structure as shown in Figure 2, groove angle D is 6～24 °, and the groove bottom is the circular arc transition, and arc radius R is 6～8mm, groove root height C is 0～1mm, and groove minimum clearance B is 0～2mm;
Second step, assembling; Forging is placed on the roller frame, adjusts roller frame, making needs the forging of butt welding to align by inside and outside footpath, and the alignment back adopts connecting plate to be connected and fixed; Fixed form adopts welding, during welding welding gun is preheated to 200～250 ℃;
The 3rd step, preheating; Use the coal gas butt welded seam to heat, heated perimeter is apart from weld seam center 800mm, and heating-up temperature is 200～250 ℃;
The 4th step, backing welding; Adopt gas to protect weldering and carry out backing welding; Adopt the electric peculiar gas shiled electric welding machine Power Wave 455M/STT source of welding current of U.S. Lincoln, gas adopts argon-rich gas (75%Ar, 25%CO
2), under the STT pattern, welding, welding wire is ER70S-6, gage of wire is 1.2mm; Adopt this welding machine control heat input and appearance of weld, can realize the single welding negative shape;
The 5th step, manual welding; Carry out manual welding on the basis of back welding, weld 2～3 layers, welding rod is selected J607 for use, and core diameter is 5mm;
In the 6th step, remove connecting plate; Adopt manual oxygen cutting machine excision connecting plate; At this moment, need fixedly connected with manual welding by above-mentioned backing welding between the forging of butt welding;
The 7th step, welding; Adopt common submerged arc welding machine to join the overlength ignition tip, on the basis of manual welding, weld, welding current I=580～620 ampere, weldingvoltage V=30～34 volt, speed of welding v=50mm/min; Continuous sequence, the full groove of weldering, welding wire is selected H08Mn2MoA for use, and solder flux is HJ250G;
The 8th step, the welding after heat; Weld seam is heated to 300～350 ℃, is incubated slow cooling after 6 hours;
The 9th step, the reconditioning weld seam; With weld seam surfaces externally and internally grinder buffing;
The tenth step, check; For guaranteeing welding quality, the gland after the welding to be detected a flaw, 100%UT (ultrasonic examination) is adopted in the commissure, and surfaces externally and internally adopts 100%MT (magnetic powder inspection).
The 11 step, the processing profile; Be processed into the gland of welding fabrication square;
The 12 step, heat treatment; Square gland is advanced the stove stress-removal; As shown in Figure 3, heat up with the speed that is not more than 60 ℃/hour, keep when temperature rises to 600 ± 20 ℃ after 6 hours, to be not more than 60 ℃/hour speed cooling, square gland can be come out of the stove when temperature was reduced to 350 ℃.
The present invention is applicable to the processing of the gland of 165MN hydraulic press, also can be applicable to the manufacturing of cylinder body.
Claims (9)
1, a kind of welding method of pressing sleeve of large-sized hydraulic press is characterized in that: adopt following steps to weld:
The first step is at commissure processing U type groove; The groove angle is 6～24 °, and the groove bottom is the circular arc transition, and arc radius is 6～8mm, and groove root height is 0～1mm, and groove minimum clearance is 0～2mm;
Second step, assembling; Making needs the forging of butt welding to align by inside and outside footpath, and adopts connecting plate to fix; Fixed form adopts welding, during welding welding gun is preheated to 200～250 ℃;
The 3rd step, preheating; Heat in the butt welded seam district, and heating-up temperature is 200～250 ℃;
The 4th step, backing welding; Adopt gas to protect weldering and carry out backing welding; Adopt the electric peculiar gas shiled electric welding machine Power Wave 455M/STT source of welding current of U.S. Lincoln, gas adopts argon-rich gas, and promptly composition is 75%Ar and 25%CO
2Gas, under the STT pattern, weld; The single welding negative shape;
The 5th step, manual welding; On the basis of back welding, carry out manual welding, weld 2～3 layers;
In the 6th step, remove connecting plate;
The 7th step, welding; Adopt common submerged arc welding machine to join the overlength ignition tip, on the basis of manual welding, weld, continuous sequence, the full groove of weldering;
The 8th step, the welding after heat.
2, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: described the 8th step is carried out following steps after finishing:
The 9th step, the reconditioning weld seam;
The tenth step, check;
The 11 step, the processing profile;
The 12 step, heat treatment.
3, the welding method of pressing sleeve of large-sized hydraulic press according to claim 2 is characterized in that:
The heat treatment method in described the 12 step is: heat up with the speed that is not more than 60 ℃/hour, keep when temperature rises to 600 ± 20 ℃ after 6 hours, to be not more than 60 ℃/hour speed cooling, when temperature is reduced to 350 ℃ gland is come out of the stove.
4, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: the welding wire that described the 4th step adopts during backing welding is ER70S-6, and gage of wire is 1.2mm; The single welding negative shape.
5, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: the welding rod that described the 5th step adopts during manual welding is J607, and core diameter is 5mm.
6, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: the welding wire that described the 7th step adopts when welding is H08Mn2MoA, and solder flux is HJ250G.
7, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: the parameter when described the 7th step welds is: welding current 580～620A, weldingvoltage 30～34V, speed of welding 50mm/min.
8, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: the heated perimeter of described the 3rd step weld metal zone is apart from weld seam center 800mm.
9, the welding method of pressing sleeve of large-sized hydraulic press according to claim 1 is characterized in that: the method for described the 8th step welding after heat is: weld seam is heated to 300～350 ℃, is incubated slow cooling after 6 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710093982A CN101352785B (en) | 2007-07-23 | 2007-07-23 | Method for welding pressing sleeve of large-sized hydraulic press |
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| CN200710093982A CN101352785B (en) | 2007-07-23 | 2007-07-23 | Method for welding pressing sleeve of large-sized hydraulic press |
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| CN101352785A true CN101352785A (en) | 2009-01-28 |
| CN101352785B CN101352785B (en) | 2010-05-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284772A (en) * | 2011-08-25 | 2011-12-21 | 哈尔滨汽轮机厂有限责任公司 | Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine |
| CN102500886A (en) * | 2011-11-11 | 2012-06-20 | 南京德邦金属装备工程有限公司 | High-strength nickel-iron-chromium alloy and chromium-nickel stainless steel plate welding method and application to preparation of polysilicon cold hydrogenation reactors |
| CN103008851A (en) * | 2012-12-14 | 2013-04-03 | 四川精控阀门制造有限公司 | All-welded ball valve body weld narrow-gap welding process and interface structure |
| CN104325230A (en) * | 2014-10-14 | 2015-02-04 | 中国十七冶集团有限公司 | Abutting welding method for box columns of large-scale factory building |
| CN107009100A (en) * | 2017-05-11 | 2017-08-04 | 山东电力建设第工程公司 | A kind of new big footpath skew T preparation method |
| CN107127430A (en) * | 2017-05-12 | 2017-09-05 | 上海森松新能源设备有限公司 | The welding method of pressure vessel composite plate |
Family Cites Families (4)
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| US6365865B1 (en) * | 1999-03-26 | 2002-04-02 | Chuohatsujo Kabushiki Kaisha | Process for welding fixture pipes to opposite ends of hollow stabilizer's suspension arm for vehicle |
| CN1325218C (en) * | 2005-04-13 | 2007-07-11 | 渤海船舶重工有限责任公司 | Double-side forming single-side butt welding method for thick-wall red copper pipe |
| CN100434222C (en) * | 2006-08-10 | 2008-11-19 | 上海人造板机器厂有限公司 | Welding process and apparatus for major diameter roller |
| CN100999052A (en) * | 2006-12-22 | 2007-07-18 | 四方机车车辆有限责任公司 | Forge welding technological method for large circle-shaped thin wall structure parts |
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2007
- 2007-07-23 CN CN200710093982A patent/CN101352785B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284772A (en) * | 2011-08-25 | 2011-12-21 | 哈尔滨汽轮机厂有限责任公司 | Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine |
| CN102284772B (en) * | 2011-08-25 | 2013-04-03 | 哈尔滨汽轮机厂有限责任公司 | Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine |
| CN102500886A (en) * | 2011-11-11 | 2012-06-20 | 南京德邦金属装备工程有限公司 | High-strength nickel-iron-chromium alloy and chromium-nickel stainless steel plate welding method and application to preparation of polysilicon cold hydrogenation reactors |
| CN103008851A (en) * | 2012-12-14 | 2013-04-03 | 四川精控阀门制造有限公司 | All-welded ball valve body weld narrow-gap welding process and interface structure |
| CN103008851B (en) * | 2012-12-14 | 2015-04-15 | 四川精控阀门制造有限公司 | All-welded ball valve body weld narrow-gap welding process and interface structure |
| CN104325230A (en) * | 2014-10-14 | 2015-02-04 | 中国十七冶集团有限公司 | Abutting welding method for box columns of large-scale factory building |
| CN107009100A (en) * | 2017-05-11 | 2017-08-04 | 山东电力建设第工程公司 | A kind of new big footpath skew T preparation method |
| CN107009100B (en) * | 2017-05-11 | 2019-10-11 | 山东电力建设第一工程公司 | A kind of novel major diameter skew T production method |
| CN107127430A (en) * | 2017-05-12 | 2017-09-05 | 上海森松新能源设备有限公司 | The welding method of pressure vessel composite plate |
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| CN101352785B (en) | 2010-05-26 |
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