CN107052535A - Two kinds of different austenite stainless steel welding methods - Google Patents
Two kinds of different austenite stainless steel welding methods Download PDFInfo
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- CN107052535A CN107052535A CN201710155787.2A CN201710155787A CN107052535A CN 107052535 A CN107052535 A CN 107052535A CN 201710155787 A CN201710155787 A CN 201710155787A CN 107052535 A CN107052535 A CN 107052535A
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- welding
- stainless steel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Abstract
The present invention relates to two kinds of different austenite stainless steel welding methods, comprise the following steps：1) welding preparation：Wlding is selected, i.e., from the small wlding of phosphorus content；Confirm the selection of welding condition, i.e. bottoming electric current, filling electric current and capping electric current；2) weld：Backing welding is welded using TIG, and welding gimmick uses the welding gimmick of single face welding and double face shaping；Using TIG weldering fillings to 5mm, optional larger welding current；Filling and cosmetic welding are welded using SMAW, using small welding current；Each interlayer temperature control is within 50 DEG C.The present invention uses above-mentioned welding method, by rationally controlling in phosphorus content, welding sequence, the accurate selection of welding parameter and welding process rationally to control heat input according to the phosphorus content of wlding to selection wlding, so as to ensure two kinds of different austenitic stainless steels, i.e. welding procedure can be realized smoothly between ultra-low carbon austenitic stainless steel and the austenitic stainless steel of general phosphorus content, and weld seam indices especially corrosion among crystalline grains meet standard requirement.
Description
Technical field
The invention belongs to welding field, and in particular to two kinds of different austenite stainless steel welding methods.
Background technology
In field gulf second phase WWER unit Nuclear Power Stations, the material of localized equipments and the material of the Russian side scope of supply it
Between Welding Problems, the welding particularly between stainless steel is always the welding technique of the Russian side concern, and middle side uses substantially now
The 00Cr19Ni10 materials of Ultra-low carbon, and the Russian side uses the general phosphorus content stainless steel of the Т titaniferous of 08 Х, 18 Н 10, the Russian side
Emphasizing the intercrystalline corrosion of two kinds of stainless steel welded rear weld seams, to meet the Russian side standard more difficult.
In the selection of wlding, because field gulf second phase WWER unit Nuclear Power Plant Projects center level equipment and pipeline welding, the Russian side
Specify and use the Russian side wlding, therefore using in the case of the Russian side wlding, the intercrystalline corrosion which kind of technique to ensure weld seam using meets Russia
Square standard is most important.
The content of the invention
For problems of the prior art, the present invention provides the welding method of two kinds of different austenitic stainless steels, protects
The welding procedure of the different austenitic stainless steels of two kinds of card can smoothly realize that weld seam meets welding standard requirement.
To achieve the above objectives, the technical solution adopted by the present invention is：Two kinds of different austenitic stainless steel welding sides are provided
Method, comprises the following steps：
1) welding preparation：Select wlding, welding point pattern, confirm welding condition；Wlding is small from phosphorus content
Wlding；
Joint geometry is docked from double V-groove；
Technological parameter includes bottoming electric current, filling electric current and capping electric current.
2) weld：Use all-position welding, the mode that both sides are welded upwards from bottommost respectively, including backing welding, filling
Weldering and cosmetic welding；
Backing welding is welded using TIG, using low current, and welding gimmick uses the welding gimmick of single face welding and double face shaping；
Using TIG weldering fillings to 5mm, back side argon gas is protected to 5mm, it is possible to increase welding current；Filling, cosmetic welding are used
SMAW is welded, using small welding current；
Each interlayer temperature control is within 50 DEG C.
Further, step 1) in, the wlding includes welding wire and welding rod, and welding wire phosphorus content is less than 0.030%, and welding rod contains
Carbon amounts is less than 0.050%.
Further, step 1) in, the backing welding electric current is 90~100A；Filling to 5mmTIG weldering electric current be 140~
150A；Filling, cosmetic welding electric current are 90~100A.
Further, step 2) in, after backing welding is soldered, using natural cooling, it is less than 50 with tempilstick test interlayer temperature
℃。
Further, step 2) in, during filling weldering, backside gas, which is protected to deposited metal thickness, is more than 5mm.
The advantageous effects of the present invention are：
The present invention is by selecting wlding, the accurate selection of welding parameter, is closed in welding process according to the phosphorus content of wlding
Reason control heat input, weld seam uses single face welding and double face shaping technology and back-protective, makes intercrystalline corrosion and the indices of weld seam
Standard requirement is reached, so as to ensure the quality of welding.
Brief description of the drawings
Fig. 1 is welding groove welding bead structural representation of the present invention；
Fig. 2 is to rush argon protection schematic diagram.
In figure：
1- first layer welding bead 2- second layers welding bead 3, the 4th layer of welding bead 6 of 4- third layer welding beads 5-, 7- layer 5 welding beads
8th, 9- layer 6s welding bead 10,11- layer 7 welding bead 12- foam seal 13- argon gas flexible pipe 14- adhesive tape 15- Ar inlets
16- argon gas exports
Embodiment
Below in conjunction with the accompanying drawings, the embodiment to the present invention is described in further detail.
The welding method of the different austenitic stainless steels of the present invention provide two kinds, pay close attention to ferrite content measure and
Corrosion among crystalline grains result of the test meets the requirement of the Russian side standard, gives up the Russian side to Sino-Russian stainless steel welded rear corrosion among crystalline grains energy
The no query for meeting the requirement of the Russian side standard, is that the relevant device production domesticization and installing engineering of the Russian side WWER unit constructions of nuclear power station are established
Basis is determined.
Mainly pass through three kinds of methods for ferritic measurement：Method of magnetic, Delong figures are calculated and WRC schemes to calculate.Wherein
Method of magnetic is the method for Russian standard accreditation, the result is that 2.06, the requirement for meeting the 2-8 of standard is in lower limit, theoretical
On it is stronger for anti intercrystalline corrosion ability, but heat resistanceheat resistant crackle tendency is weaker.DeLong figures calculated value be 8.3 and 11.7, RCC-M and
ASME required values are general in 5-12, and its result is more satisfactory, it can be seen that both mother metals are welded, and its ferritic content is in mark
Within the scope of standard, its intercrystalline corrosion tendency is weaker.
Weld seam anti intercrystalline corrosion crackle tendency is mainly investigated in Huey test, and ferrite experiment above proves its iron element
Body content is within standard claimed range, and its intercrystalline corrosion tendency is smaller in theory.According to the А in Г О С Т 6032-89
(time being incubated in the solution of boiling should be (24.00 ± 0.25) h to М methods.In order to show intercrystalline corrosion, it is incubated in the solution
After end, by sample (press Г О С Т 14019) bending (90 ± 3) ° welding point without sensing heating), Г О С Т
А М y methods and NB/T20004-2011B methods in 6032-03 are carried out after sensitized treatment, and four groups of experiments of two methods are not sent out
Existing intergranular corrosion cracks tendency, even if having carried out sensitized treatment, from the angle of experiment also demonstrate its anti intercrystalline corrosion ability compared with
By force, i.e., the describing property of welding of two kinds materials has no problem completely in terms of anti intercrystalline corrosion.Thus, the present invention by using
Rational welding technology measure, improves the microscopic structure of weld seam, obtains good corrosion resistance welding point.
The welding method that the present invention is used is as follows：
(1) wlding and protective gas selection：
The wlding of the Russian side provides that the phosphorus content requirement≤0.06% of welding wire, the phosphorus content of welding rod is wanted in its professional standard
≤ 0.10% is asked, but in the welding of austenitic stainless steel, passes through analysis, it is believed that phosphorus content is larger in standard, should select carbon containing
The small wlding of amount, and then wlding is rechecked, it is determined that being less than 0.030% from welding wire phosphorus content, 0.029% is actually selected,
Welding rod phosphorus content is less than 0.050%, actually selects 0.049%.Protective gas：From the argon gas of purity 99.99%.
(2) joint geometry：
From double V-groove docking, groove face must assure that bright and clean smooth, and surface state must is fulfilled for welding procedure and phase
The nondestructive testing requirement answered, welding groove surface and both sides of the edge with acetone with mother metal adjacent domain 20mm width ranges, being wiped
Wipe cleaning, anhydrous, oxide-free, without greasy dirt and other objectionable impurities.
(3) welding condition is confirmed：
Backing welding electric current：90~100A, using single face welding and double face shaping technology；Fill TIG weldering electric currents：140~150A；Fill out
Fill, cosmetic welding electric current：90~100A, back side argon gas, which is protected to deposited metal thickness, is more than 5mm, and interlayer temperature is less than 50 DEG C.
(4) welding preparation：Welding wire uses acetone wiped clean before；Welding rod is dried according to specification；Welding equipment is adopted
With inverter type welder, various instrument are within the assay approval phase on welding machine.Prepare tempilstick to determine interlayer temperature.
(5) group pair before welding：The corresponding specification that misalignment should be met, should be evenly distributed to each by misalignment (especially interior misalignment)
Direction.Guarantee group is 60 degree or so in 1-2mm, bevel angle R in 1-3mm, backing welding floor height L2 to gap L 1, as shown in Figure 1.
(6) preshoot argon is welded：For stainless steel pipes, first with foam seal 12 by group to good two tubes
Two ends are blocked, and argon gas flexible pipe 13 is put in from one end, and group is sealed to gap location water-soluble adhesive tape 14.Argon gas enters from Ar inlet 15
Enter, discharged from argon gas export 16, as shown in Figure 2.Rush argon gas 20 minutes in advance, argon flow amount 16L/min.
(7) weld：Using all-position welding, the mode that both sides are welded upwards from bottommost respectively, backing welding is welded using TIG,
Weld the welding gimmick that gimmick uses single face welding and double face shaping；It is soldered after first, using natural cooling, uses tempilstick test layer
Between temperature be less than 50 DEG C；Filling is welded to 5mm using TIG, and now because the carbon content of welding wire is smaller, electric current can be larger, the back of the body
Continue gas shield to deposited metal thickness and be more than 5mm in face；Filling, cosmetic welding use SMAW, because the phosphorus content of welding rod is higher,
Therefore welding current uses low current.
Below with the Т of 08 Х of Russia's mother metal, 18 Н 10 and Chinese mother metal 00Cr19Ni10 austenitic stainless steels, specification is Φ
Further illustrated exemplified by 273X20mm pipeline：
Welding position and direction are applied to the Sizing In Butt Welded Pipes of 1GT, 2GT, 5G1T, 6GT position.Weld seam is divided into 7 layers
Welding bead：First layer welding bead 1, second layer welding bead 2, third layer welding bead 3, the 4, the 4th layer of welding bead 5, layer 5 welding bead 6,7, layer 6 weldering
Road 8,9, layer 7 welding bead 10,11, as shown in Figure 1.First layer welding bead 1, backing welding；Second layer welding bead is filled out to the 4th layer of welding bead
Fill weldering；Layer 5 welding bead to layer 7 welding bead, cosmetic welding, the technological parameter of welding is shown in Table 1.Table 1
Postwelding is examined and tested：Welded by said welding method, ray inspection is carried out according to the Russian side standard after welding
Test, checked and accepted by the standard of 1 grade of weld seam；Postwelding test specimen has carried out chemical analysis, stretching, intercrystalline corrosion, impact, metallographic, ferrite
Calculating etc. is tested, and chemically constituent analysis, intercrystalline corrosion result, Metallographic Analysis is seen, Sino-Russian two countries' ultra-low carbon austenitic stainless steel
Austenitic stainless steel between the austenitic stainless steel of general phosphorus content is by rational welding procedure, and intercrystalline corrosion meets Russia
The most tight standard requirement in side.
It should be noted that two kinds of different austenitic stainless steels of the present invention refer to ultra-low carbon austenitic stainless steel with
General phosphorus content austenitic stainless steel.
Two kinds of the present invention is different, and austenite stainless steel welding method is not limited to above-mentioned embodiment, art technology
Personnel's technique according to the invention scheme draws other embodiments, also belongs to the technological innovation scope of the present invention.
Claims (5)
1. two kinds of different austenite stainless steel welding methods, comprise the following steps：
1) welding preparation：Select wlding, confirm welding condition；
Wlding is from the small wlding of phosphorus content；
Technological parameter includes bottoming electric current, filling and capping electric current, interlayer temperature；
2) weld：I.e. use all-position welding, the mode that both sides are welded upwards from bottommost respectively, including backing welding, filling weldering and
Cosmetic welding；
Backing welding is welded using TIG, and welding gimmick uses the welding gimmick of single face welding and double face shaping, using low current；
Filling is welded to 5mm using TIG, and back side argon gas is protected to 5mm, it is possible to increase welding current；
Filling, cosmetic welding are welded using SMAW, using small welding current；
Each interlayer temperature control is within 50 DEG C.
2. two kinds as claimed in claim 1 different austenite stainless steel welding methods, it is characterized in that：Step 1) in, the weldering
Material includes welding wire and welding rod, and welding wire phosphorus content is less than 0.030%, and welding rod phosphorus content is less than 0.05%.
3. two kinds as claimed in claim 1 different austenite stainless steel welding methods, it is characterized in that：Step 1) in, it is described to beat
Back welding TIG weldering electric currents are 90~100A；Filling is welded to 5mm using TIG, and back side argon gas is protected to 5mm, and filling weldering electric current is 140
~150A；Filling, cosmetic welding are welded using SMAW, and electric current is 90~100A.
4. two kinds as claimed in claim 1 different austenite stainless steel welding methods, it is characterized in that：Step 2) in, backing welding
After being soldered, using natural cooling, it is less than 50 DEG C with tempilstick test interlayer temperature.
5. two kinds as claimed in claim 1 different austenite stainless steel welding methods, it is characterized in that：Step 2) in, filling weldering
When, backside gas, which is protected to deposited metal thickness, is more than 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710155787.2A CN107052535B (en) | 2017-03-16 | 2017-03-16 | Welding method for two different austenitic stainless steels |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710155787.2A CN107052535B (en) | 2017-03-16 | 2017-03-16 | Welding method for two different austenitic stainless steels |
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| CN107052535A true CN107052535A (en) | 2017-08-18 |
| CN107052535B CN107052535B (en) | 2021-12-03 |
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| CN111015007A (en) * | 2018-10-09 | 2020-04-17 | 中国电力科学研究院有限公司 | Welding rod for stainless steel welding and welding method thereof |
| CN112059465A (en) * | 2020-09-30 | 2020-12-11 | 上海电气核电设备有限公司 | Connecting structure for reactor container and welding process |
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| CN112059465A (en) * | 2020-09-30 | 2020-12-11 | 上海电气核电设备有限公司 | Connecting structure for reactor container and welding process |
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| CN107052535B (en) | 2021-12-03 |
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