CN104209659A - Method for achieving vacuum in composite blank assembly welding process - Google Patents

Method for achieving vacuum in composite blank assembly welding process Download PDF

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Publication number
CN104209659A
CN104209659A CN201310211969.9A CN201310211969A CN104209659A CN 104209659 A CN104209659 A CN 104209659A CN 201310211969 A CN201310211969 A CN 201310211969A CN 104209659 A CN104209659 A CN 104209659A
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China
Prior art keywords
vacuum
welding
slab
welded
plate blanks
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CN201310211969.9A
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CN104209659B (en
Inventor
袁向前
焦四海
张爱文
鲁志政
白岩
王治宇
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/18Sheet panels

Abstract

The invention provides a method for achieving vacuum in the composite blank assembly welding process. The method includes the following steps that firstly, plates are prepared, namely, two plate blanks are taken, oxide scales on the surfaces of the plate blanks are completely removed, chamfers are machined in the peripheries of the combined surfaces of the plate blanks, and then grooves are formed; secondly, earlier-stage closed sealing is conducted, namely, the grooves of the two plate blanks are welded for at least three layers; thirdly, vacuumization is carried out, namely, a mechanical vacuum pump enters the position between the two plate blanks from a connecting hole reserved in a welding joint to conduct vacuumization, the vacuum degree is below 10 Pa after extraction, and then a molecular vacuum pump is used for continuous vacuumization until the vacuum degree is below 0.01 Pa; fourthly, two-step welding control is conducted under the vacuum condition. Vacuum between the two assembled plate blanks can be guaranteed, oxygen molecules adsorbed to the combined surface of the plate blanks are fewer, and then the composite quality of combined interfaces after composite rolling is improved.

Description

The implementation method of vacuum during a kind of composite billet assembly welding
Technical field
The present invention relates to thick composite plate manufacturing technology field, particularly a kind of implementation method of composite billet assembly welding process vacuum.
Background technology
The steel production enterprise of carrying out sandwich rolling process production slab both at home and abroad mostly adopts vacuum electron beam welding, slab after removing surface is put in vacuum chamber at once, under vacuum, welded closure is carried out to the faying face surrounding of two boards base, and maintains the vacuum state of two boards base intermediate surface.
Traditional welding method can be closed the surrounding of slab equally, but the more difficult maintenance of vacuum state of two boards base faying face.Because traditional welding method exposes to carry out in atmosphere, the heat input of welding process also can have heat effect to slab, when slab has uniform temperature, fresh metal after original removing surface also can accelerate, by the steel slab surface of the oxygen desorption in air at faying face, can reduce the composite quality of faying face in the operation of rolling.
Summary of the invention
The implementation method of vacuum when the object of the present invention is to provide a kind of composite billet assembly to weld, can after assembly welding terminates, realize the vacuum at pretreatment composite billet slab faying face place, and the oxygen that the slab faying face after cleaning adsorbs all dissipation is gone out, vacuum after guarantee assembly in the middle of two boards base, and the oxygen molecule that slab faying face adsorbs is lower, and then improve the composite quality of combination interface after composite rolling.
For achieving the above object, technical scheme of the present invention is:
During the welding of composite billet assembly, an implementation method for vacuum, comprises the steps:
1) slave board
Get two boards base, the iron scale of steel slab surface is cleaned out, and form groove at the surrounding chamfering of slab faying face, then the cleaning face of two boards base is positioned in air face-to-face;
2) close welding early stage to weld two boards base groove, weld at least three layers, every layer thickness 3mm-10mm, ensure the air-tightness of surrounding weld seam; Period is a reserved access aperture in weld seam;
3) extracting vacuum
Enter extracting vacuum between two boards base from the access aperture that weld seam is reserved with oil-sealed rotary pump, vacuum is drawn into below 10Pa, then use molecular pump instead and continue extracting vacuum degree to below 0.01Pa;
4) under vacuum condition, two step welding control
Carry out under under the state of molecular pump work, namely vacuum is less than 0.01Pa having welded residue welding job amount into two steps, first step welding job amount controls the 40%-60% in residue welding job amount, and welding process is continuous; After the first step has been welded, need 2-12 hours interval; Then carry out second step welding, complete residue welding job amount, weld seam is full of completely, and welding process terminates, and is closed by vacuum passage, keeps the vacuum state between slab.
Further, step 2) close early stage in welding process, a pre-buried conduit in two boards base groove, form the access aperture for vavuum pump access.
Again, step 4) vacuum to be monitored in welding process, during first step welding, fluctuation vacuum amount is 20% ~ 80%, and when proving to weld, slab faying face adsorption gas is more active when sweating heat heats, and accelerates dissipation under vacuum; During second step welding, fluctuation vacuum amount is less than 10%, proves when the first step is welded, and the dissipation of slab faying face adsorption gas exhausts, and welding completes.
Sandwich rolling process produces slab to the demand of vacuum state between two boards base:
(1) vacuum.Sandwich rolling process produces slab, needs realize and keep the vacuum state between two pieces of composite plates, and any residual gas all likely can cause complex fail.Therefore, when compound assembly, ensure that the vacuum between two boards base is less than 0.1Pa.
(2) the adsorb oxygen molecule dissipation on slab faying face surface.Slab completes to welding procedure after removing surface, and the surface after cleaning exposes in atmosphere, can adsorb certain air, need the air of absorption to try one's best dissipation.
The present invention considers above-mentioned two demands, realizes larger improvement with the vacuum of existing conventional assembly welding process.
Existing conventional assembly is welded with two kinds of methods, and a kind of is vacuum electron beam welding equipment by costliness, is placed in by slab in vacuum chamber, when vacuum chamber reaches vacuum level requirements, starts to carry out surrounding welding to slab until welding terminates.The equipment investment of the method costly, and needs to carry out extracting vacuum to whole vacuum chamber, and the time vacuumized is longer.
Second method carries out assembly in atmosphere, then carries out surrounding welding, again from reserved access device extracting vacuum after welding job completes.The method is in the whole process of welding, and slab faying face is and air contact condition always, and sweating heat has certain heat effect to slab, in longer welding process, produces certain oxidation during standby base through the slab faying face of cleaning.After enforcement composite rolling, slab faying face can produce some stains.Because these stains are combined with impact to slab, the method is also denied always.
The present invention takes assembly in air, does not need expensive vacuum electronic beam device.First implement to close welding, its welding job amount is less, and the time is also shorter, can avoid the slab faying face problem of oxidation through cleaning.Then implement extracting vacuum, because the space of extracting vacuum is only for the small space between two boards base faying face, the efficiency of extracting vacuum is also higher.The two steps welding that butt welded seam is implemented under vacuum condition again after vacuum reaches 0.01Pa control, and have both avoided welding oxidation, and make use of again the heat effect of sweating heat to slab, and facilitated the dissipation of slab cleaning rear surface absorbed air molecule.
Beneficial effect of the present invention:
By method of the present invention, can after assembly welding terminates, realize the vacuum at pretreatment composite billet slab faying face place, and the oxygen that the slab faying face after cleaning adsorbs all dissipation is gone out, vacuum after guarantee assembly in the middle of two boards base, and the oxygen molecule that slab faying face adsorbs is lower, and then improve the composite quality of combination interface after composite rolling.
Accompanying drawing explanation
Fig. 1 is the groove schematic diagram in the embodiment of the present invention.
Fig. 2 is for being faying face metallographic after existing composite billet rolling.
Fig. 3 is faying face metallographic after employing composite billet rolling of the present invention.
Detailed description of the invention
See Fig. 1, during a kind of composite billet assembly welding of the present invention, the implementation method of vacuum, comprises the steps:
1) slave board
Get two boards base 1,2, the iron scale of steel slab surface is cleaned out, and form groove 3 at the surrounding chamfering of slab faying face A, then the cleaning face of two boards base 1,2 is positioned in air face-to-face;
2) welding is closed early stage
Two boards base 1,2 groove 3 is welded, welds at least three layers, every layer thickness 3mm-10mm, ensure the air-tightness of surrounding weld seam; Period is a reserved access aperture in weld seam;
3) extracting vacuum
Enter extracting vacuum between two boards base from the access aperture that weld seam is reserved with oil-sealed rotary pump, vacuum is drawn into below 10Pa, then use molecular pump instead and continue extracting vacuum degree to below 0.01Pa;
4) under vacuum condition, two step welding control
Carry out under under the state of molecular pump work, namely vacuum is less than 0.01Pa having welded residue welding job amount into two steps, first step welding job amount controls the 40%-60% in residue welding job amount, and welding process is continuous; After the first step has been welded, need 2-12 hours interval; Then carry out second step welding, complete residue welding job amount, weld seam is full of completely, and welding process terminates, and is closed by vacuum passage, keeps the vacuum state between slab.
Further, step 2) close early stage in welding process, a pre-buried conduit 4 in two boards base 1,2 groove 3, form the access aperture for vavuum pump access.
Again, step 4) vacuum to be monitored in welding process, during first step welding, fluctuation vacuum amount is 20% ~ 80%, and when proving to weld, slab faying face adsorption gas is more active when sweating heat heats, and accelerates dissipation under vacuum; During second step welding, fluctuation vacuum amount is less than 10%, proves when the first step is welded, and the dissipation of slab faying face adsorption gas exhausts, and welding completes.
Composite billet after welding is positioned in heating furnace and is heated to 1200 DEG C, be incubated and come out of the stove after 3 hours, be rolled, cool.Carrying out sample analysis to model, as shown in Figure 2, for not implementing the faying face after composite billet rolling of the present invention, having a lot of point, the air molecule residual for the inside causes.As shown in Figure 3, for implementing the faying face after composite billet rolling of the present invention, on faying face, not there is not the point of marshalling.

Claims (3)

1. when composite billet assembly welds, an implementation method for vacuum, comprises the steps:
1) slave board
Get two boards base, the iron scale of steel slab surface is cleaned out, and form groove at the surrounding chamfering of slab faying face, then the cleaning face of two boards base is positioned in air face-to-face;
2) welding is closed early stage
Two boards base groove is welded, welds at least three layers, every layer thickness 3mm-10mm, ensure the air-tightness of surrounding weld seam; Period is a reserved access aperture in weld seam;
3) extracting vacuum
Enter extracting vacuum between two boards base from the access aperture that weld seam is reserved with oil-sealed rotary pump, vacuum is drawn into below 10Pa, then use molecular pump instead and continue extracting vacuum degree to below 0.01Pa;
4) under vacuum condition, two step welding control
Carry out under under the state of molecular pump work, namely vacuum is less than 0.01Pa having welded residue welding job amount into two steps, first step welding job amount controls the 40%-60% in residue welding job amount, and welding process is continuous; After the first step has been welded, need 2-12 hours interval; Then carry out second step welding, complete residue welding job amount, weld seam is full of completely, access aperture is closed, welding process terminates, and keeps the vacuum state between slab.
2. when composite billet assembly as claimed in claim 1 welds, the implementation method of vacuum, is characterized in that, step 2) close early stage in welding process, a pre-buried conduit in two boards base groove, form the access aperture accessed for vavuum pump.
3. the implementation method of vacuum when composite billet assembly as claimed in claim 1 welds, it is characterized in that, in step 4) welding process, vacuum is monitored, during first step welding, fluctuation vacuum amount is 20% ~ 80%, when proving to weld, slab faying face adsorption gas is more active when sweating heat heats, and accelerates dissipation under vacuum; During second step welding, fluctuation vacuum amount is less than 10%, proves when the first step is welded, and the dissipation of slab faying face adsorption gas exhausts, and welding completes.
CN201310211969.9A 2013-05-31 2013-05-31 The implementation method of vacuum during the welding of a kind of composite billet assembly Active CN104209659B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107175462A (en) * 2017-05-03 2017-09-19 河钢股份有限公司邯郸分公司 A kind of composite plate blanks preparation method for rolling composite plate
CN110819770A (en) * 2019-10-28 2020-02-21 鞍钢股份有限公司 Steel plate for large-thickness hydrogenation reactor shell and manufacturing method thereof

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JPS63140782A (en) * 1986-12-04 1988-06-13 Sumitomo Special Metals Co Ltd Production of multi-layered clad plate
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JPH10180464A (en) * 1996-12-24 1998-07-07 Sumitomo Metal Ind Ltd Manufacture of copper-stainless steel clad plate
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CN102009332A (en) * 2010-09-15 2011-04-13 北京科技大学 Method for producing super-thick plate by packrolling welding process
CN102240894A (en) * 2011-06-01 2011-11-16 河北钢铁集团有限公司 Composite manufacturing method of ultra-thick steel plate
CN102248372A (en) * 2011-06-22 2011-11-23 河南盛荣特种钢业有限公司 Method for producing single-sided composite stainless steel cold rolling base stock
CN202213277U (en) * 2011-09-07 2012-05-09 三明天尊不锈钢复合科技有限公司 Assembly of metal composite plate vacuum rolling method
CN102773254A (en) * 2012-07-26 2012-11-14 李向民 Preparation method of titanium-steel single-sided composite board
CN102873091A (en) * 2012-10-23 2013-01-16 武汉钢铁(集团)公司 Preparation method for wear-resistant steel and carbon structural steel composite plates
CN102896404A (en) * 2012-09-28 2013-01-30 河北钢铁集团有限公司 Method for preparing laminated metal composite blank
CN102990317A (en) * 2012-12-11 2013-03-27 云南昆钢新型复合材料开发有限公司 Method for vacuum assembling and non-vacuum rolling laminated metal composite material roll

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Publication number Priority date Publication date Assignee Title
JPS59153590A (en) * 1983-02-22 1984-09-01 Sumitomo Metal Ind Ltd Production of clad steel plate
JPS6188984A (en) * 1984-10-05 1986-05-07 Nippon Stainless Steel Co Ltd Manufacture of titanium clad material
JPS63140782A (en) * 1986-12-04 1988-06-13 Sumitomo Special Metals Co Ltd Production of multi-layered clad plate
JPS63306031A (en) * 1987-06-08 1988-12-14 Sumitomo Metal Ind Ltd Titanium-based metal clad steel and manufacture thereof
JPH10180464A (en) * 1996-12-24 1998-07-07 Sumitomo Metal Ind Ltd Manufacture of copper-stainless steel clad plate
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CN102009332A (en) * 2010-09-15 2011-04-13 北京科技大学 Method for producing super-thick plate by packrolling welding process
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CN102248372A (en) * 2011-06-22 2011-11-23 河南盛荣特种钢业有限公司 Method for producing single-sided composite stainless steel cold rolling base stock
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CN102773254A (en) * 2012-07-26 2012-11-14 李向民 Preparation method of titanium-steel single-sided composite board
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107175462A (en) * 2017-05-03 2017-09-19 河钢股份有限公司邯郸分公司 A kind of composite plate blanks preparation method for rolling composite plate
CN110819770A (en) * 2019-10-28 2020-02-21 鞍钢股份有限公司 Steel plate for large-thickness hydrogenation reactor shell and manufacturing method thereof

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