CN104741745A - Submerged arc welding process for marine engineering structure under low-temperature environment service - Google Patents
Submerged arc welding process for marine engineering structure under low-temperature environment service Download PDFInfo
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- CN104741745A CN104741745A CN201510201322.7A CN201510201322A CN104741745A CN 104741745 A CN104741745 A CN 104741745A CN 201510201322 A CN201510201322 A CN 201510201322A CN 104741745 A CN104741745 A CN 104741745A
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- welding
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- wlding
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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
- B23K9/18—Submerged-arc welding
-
- 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
- B23K9/0061—Underwater arc welding
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
Abstract
The invention provides a submerged arc welding process for a marine engineering structure under low-temperature environment service. The method comprises the following steps: (I) determining a welding way for a base material; (II) determining the joint type of the base material; (III) selecting a welding material; (IV) determining welding parameters; (V) performing welding control. The welding process of an EH36-Z35 steel plate/tube of which the thickness is 40-88 millimeters under low temperature environment service is implemented. Meanwhile, the welding process of a DH36-Z35 steel plate/tube of which the thickness is 45 110 millimeters under low temperature environment service is implemented. By adopting the process, a large amount of labor force and electric power are saved while a thermal treatment process is replaced, the equipment investment is reduced, the working period is shortened, and the degradation of the mechanical property of a welding joint caused by thermal treatment faults is avoided.
Description
Technical field
The present invention relates to welding technology field, particularly relate to the submerged welding process under the military service of a kind of offshore engineering structure low temperature environment.
Background technology
Along with offshore engineering structure progressively moves towards deep water and low-temperature region, engineering project main structure steel design wall thickness is increasing, and service temperature is also more and more lower.Fill wlding deposited metal amount during the welding of slab, ultra-thick plate large, weld interval is long, and hot input total amount is high, and during component welding, weld seam constraint (restraint) degree is high, welding residual stress large, and post-weld stress and distortion are greatly; In welding welding process, easily produce fire check and cold crack.At present both at home and abroad offshore engineering structure generally to more than 40 or the structure welding of 50mm require to adopt heat treatment or CTOD technique (CTOD, namely Crack Tip Opening Displacement, refers to crack tip opening displacement; CTOD test is the effective ways of a kind of evaluating material and welding point break resistance; CTOD technique refers to the welding procedure with CTOD test evaluation).Offshore engineering structure scale is large, the long construction period of heat-treating, human and material resources cost is high, and therefore, the welding procedure (CTOD technique) that the offshore engineering structure under being on active service to low temperature environment uses crack tip opening displacement method to evaluate becomes reasonable selection.
Summary of the invention
The submerged welding process of post weld heat treatment can be exempted under the object of the present invention is to provide a kind of offshore engineering structure low temperature environment to be on active service, the CTOD welding procedure of thickness at the GB712EH36-Z35 steel plate/pipe of 40 to 88mm can be realized to the lower welding of being on active service of offshore engineering structure low temperature environment, minimumly can meet-25 DEG C of low temperature military services; Also can realize the CTOD welding procedure of thickness at the GB712DH36-Z35 steel plate/pipe of 45 to 100mm, minimumly can meet-15 DEG C of low temperature and be on active service.
The present invention solves its technical problem by the following technical programs:
Submerged welding process under offshore engineering structure low temperature environment military service of the present invention, is characterized in that, comprise the following steps: (one) determines the welding manner to mother metal; (2) joint categories of mother metal is determined; (3) wlding is selected; (4) welding parameter is determined; (5) welding controls.
Submerged welding process under aforesaid offshore engineering structure low temperature environment military service, is characterized in that,
Describedly determine that welding manner comprises manual electric arc welding+submerged-arc welding or Surface Tension Transition melting pole gas shielded arc welding+submerged-arc welding;
Described joint categories comprises X-type groove, K type groove, double V-groove or monolateral double V-groove;
It is manual arc weld material is AWS A5.1E7016 that described wlding is selected, the Conarc 52 of this AWS A5.1E7016 wlding to be diameter that Lincoln produces be 3.2mm, or the diameter that refreshing steel is produced is the LB-52U of 3.2mm; Surface Tension Transition melting pole gas shielded arc welding (be called for short STT weldering) back cover wlding is AWS A5.18ER70S-G, the JM-58 welding wire of this AWS A5.18ER70S-G wlding to be diameter that Lincoln produces be 1.2mm; It is AWS A5.23F8A8-ENi1K-Ni1 that capping wlding is filled in submerged-arc welding, and this AWS A5.23F8A8-ENi1K-Ni 1 wlding is the diameter that Lincoln produces is the PREMIERWELD of 4.0mm
tMni1K welding wire; Solder flux is 8500, and it is the corresponding PREMIER WELD of Lincoln's manufacturer production
tMthe supporting solder flux of Ni 1K welding wire;
Describedly determine that welding parameter comprises: preheat temperature is 110 DEG C, and interlayer temperature is 110 to 200 DEG C; When the diameter that manual electric arc welding adopts Lincoln to produce is Conarc 52 welding rod of 3.2mm, electric current 80 to 100A, voltage 20 to 22V; When the diameter that manual electric arc welding adopts refreshing steel to produce is the LB-52U welding rod of 3.2mm, electric current 90 to 110A, voltage 20 to 22V; When the diameter that Surface Tension Transition melting pole gas shielded arc welding (STT weldering) adopts Lincoln to produce is the JM-58 welding wire of 1.2mm, electric current 150 to 170A, voltage 18 to 20V; The diameter that submerged-arc welding adopts Lincoln to produce is the PREMIER WELD of 4.0mm
tMduring Ni1K welding wire, electric current 400 to 600A, voltage 27 to 34V;
Described welding control is: first from front back cover in welding process, when positive plane tie completes the welding of 1/3, or when joint occurs obviously to be out of shape, upset joint or direct direction overleaf start back chipping, till removing root defect completely; Then welding from the back side, until sealing run completes welding, has finally continued the remaining welding of positive plane tie.If find in whole welding process obvious distortion all can first welding piece just at the back side of solder side.
Submerged welding process under aforesaid offshore engineering structure low temperature environment military service, it is characterized in that, described mother metal is the offshore engineering structure of being on active service in marine environment, this offshore engineering structure is included in the GB712EH36-Z35 model steel that the thickness of being on active service in-25 DEG C or more temperature environments is 40 to 88mm, and the thickness of being on active service in-15 DEG C or more temperature environments is at the steel of the GB712DH36-Z35 model of 45 to 110mm.
The be on active service beneficial effect of lower submerged welding process of offshore engineering structure low temperature environment of the present invention is: the post weld heat treatment work can exempting slab/tubular construction under low temperature environment, reduces human and material resources cost, shortening construction period.
Detailed description of the invention
Embodiment:
1, mother metal is selected: domestic ocean engineering common steel GB712-2011EH36-Z35 (thickness 80mm), GB712-2011DH36-Z35 (thickness 90mm/100mm).
2, wlding: selected a kind of SAW consumable material, Lincoln Jinzhou welding wire for submerged-arc welding PREMIER WELD
tMni1K (4.0mm), Lincoln's submerged arc welding flux 8500; Select suitable back cover wlding, Lincoln's uranami welding electrode Conarc52 (3.2mm), refreshing steel uranami welding electrode LB-52U (3.2mm), and STT welding wire JM-58 (1.2mm).
3, joint design: choose X-type and K type groove according to AWS D1.1/D1.1M (American National welding for steel structure specification) and DNV-OS-C401 (Norway's offshore structure assembling and testing standard) standard; Groove gap is unified is 2-4mm, root face 1-2mm; Wherein X-type bevel angle 60 °, K type bevel angle 45 °.
4, welding method: manual electric arc welding+submerged-arc welding (SMAW+SAW), Surface Tension Transition melting pole gas shielded arc welding+submerged-arc welding (GMAW (STT)+SAW).
5, welding position: 3G/1G (SMAW, GMAW), 1G (SAW).
6, welding parameter: preheat temperature is 110 DEG C, manual welding Conarc 52 welding rod electric current 80-100A, voltage 20-22V, heat input 1.8-2.5KJ/mm; LB-52U welding rod electric current 90-110A, voltage 20-22V, heat input 0.9-2.0KJ/mm; STT welds JM-58 welding wire electric current 150-170A, voltage 18-20V, heat input 1.3-1.5KJ/mm; Submerged-arc welding PREMIER WELD
tMni1K first fills electric current 400-450A, voltage 27-29V, heat input 1.2-2.0KJ/mm, all the other roads primary current 400-600A, voltage 27-34V, heat input 1.5-3.0KJ/mm.
7, welding controls: blanking cutting mother metal the groove face of steel plate of having polished, and at least 25mm should by polish or other proper method be cleaned out on welding region both sides simultaneously.
(1) according to joint design group to groove, ensure the gap of 2-4mm.
(2) preheat temperature at least 110 DEG C, interlayer temperature controls below 200 DEG C.
(3) welding sequence: for distinguishing the welding of double groove both sides, butt joint divides A and B two sides.
A () first starts back cover welding to A face;
B () fills capping with submerged-arc welding again, note parameter to turn down, prevent from burning when first is filled; When being soldered to about 1/3 of A plane tie throat depth, steel plate entirety produces distortion, and overturning steel plate is to B face;
C () uses the back bead of carbon arc air gouging back welding, polished and confirm to remove all defect completely by abrasive machine;
D () then welds from B face, when B face has welded about 2/3, again overturn joint;
E complete and capping is filled in remaining A face by (), overturning steel plate is to B face;
F () completes filling and the cover welding of B face residue joint.
8, welding cleaning: before every new welding bead of one deck starts, first carries out interlayer cleaning and starts welding again time if necessary.
9, Welding Testing: postwelding first carries out appearance test, carries out magnetic powder inspection and ultrasonic examination after welding completes 48 hours.
(1) machined: according to AWS D1.1/D1.1M standard processing traditional performance testpieces, specifically comprise stretchings, bending, impact, macroscopic view and hardness, full weld seam tension test part; Simultaneously for the testpieces (due to testpieces thickness >=80mm, choose B × B sample) of CTOD sample according to BS7448PART 2 and DNV-OS-C401 standard processing B × B.
(2) performance test:
A () carries out corresponding performance test according to AWS D1.1/D1.1M, BS7448PART 2, DNV-OS-C401.Wherein by-40 DEG C, impulse member is got to GB712-2011EH36-Z35 material, according to-20 DEG C, impulse member is got to GB712-2011DH36-Z35.
B () gets the CTOD of-25 DEG C to GB712-2011EH36-Z35, weld metal zone CTOD minimum of a value 0.9830mm, heat affected area minimum of a value 0.1965mm; GB712-2011DH36-Z35 is got to the CTOD of-15 DEG C, weld metal zone minimum of a value is 0.7153mm, and heat affected area minimum of a value is 0.9342mm; GB712-2011DH36-Z35 is got to the CTOD weld metal zone minimum of a value 0.1944mm of-10 DEG C, heat affected area minimum of a value 0.7139mm; GB712-2011DH36-Z35 is got to the CTOD weld metal zone minimum of a value 1.7598mm of 0 DEG C, heat affected area minimum of a value 0.3843mm (note: all values gets the minimum of a value of test.If only get 3 samples according to the test of DNV-OS-C401 standard, then 3 samples all must be qualified; If there is a specimen test defective, allows to increase to 6 samples and wherein only have a failure, remain 5 be qualified).
C () CTOD value is as shown in table 1 below in detail:
In table 1:
W represents weld seam;
W1 represents the CTOD sample got at position while welding, is numbered W1;
W2 represents the CTOD sample got at position while welding, is numbered W2;
W3 represents the CTOD sample got at position while welding, is numbered W3;
W4 represents the CTOD sample got at position while welding, is numbered W4;
W5 represents the CTOD sample got at position while welding, is numbered W5;
W6 represents the CTOD sample got at position while welding, is numbered W6;
H represents heat affected area;
H1 represents the CTOD sample got in position, heat affected area, is numbered H1;
H2 represents the CTOD sample got in position, heat affected area, is numbered H2;
H3 represents the CTOD sample got in position, heat affected area, is numbered H3;
H4 represents the CTOD sample got in position, heat affected area, is numbered H4;
H5 represents the CTOD sample got in position, heat affected area, is numbered H5;
H6 represents the CTOD sample got in position, heat affected area, is numbered H6.
Give the CTOD result of the test of this technique at four kinds of temperature in table 1, Biao Zhong test bit unit is mm.As follows about result of the test illustration: for last column data, the welding piece that EH36-Z35 material is corresponding samples at-25 DEG C carries out CTOD (crack tip opening displacement) test, the CTOD value of weld metal zone sample 1 is 1.6064mm, and the CTOD value of heat affected area sample 5 is 1.7973mm.From table, data can find following rule, and CTOD value reduces with test temperature and declines, and heat affected area CTOD value is overall lower than weld seam CTOD value, affects larger by weld seam CTOD value.
Advantage of the present invention is as follows: 1, back welding both can use welding rod (Conarc 52 or LB-52U), efficient STT also can be used to weld (JM-58), can select back cover technique flexibly during site operation according to practice of construction situation.2, the low temperature breaking through DH36-Z35 material submerged arc technique covers temperature, minimumly can meet-15 DEG C of military services, and thickness is the highest can cover 100mm.3, break through the cladding thickness of EH36-Z35 material submerged arc technique, the highlyest meet 88mm, simultaneously minimum meet-25 DEG C of environment under be on active service.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (3)
1. the submerged welding process under the military service of offshore engineering structure low temperature environment, is characterized in that, comprise the following steps:
(1) welding manner to mother metal is determined;
(2) joint categories of mother metal is determined;
(3) wlding is selected;
(4) welding parameter is determined;
(5) welding controls.
2. the submerged welding process under offshore engineering structure low temperature environment military service according to claim 1, is characterized in that,
Describedly determine that welding manner comprises manual electric arc welding+submerged-arc welding or STT weldering+submerged-arc welding;
Described joint categories comprises X-type groove, K type groove, double V-groove or monolateral double V-groove;
It is manual arc weld material is AWS A5.1 E7016 that described wlding is selected, the Conarc 52 of this AWS A5.1E7016 wlding to be diameter that Lincoln produces be 3.2mm, or the diameter that refreshing steel is produced is the LB-52U of 3.2mm; Surface Tension Transition melting pole gas shielded arc welding (STT weldering) back cover wlding is AWS A5.18 ER70S-G, the JM-58 welding wire of this AWS A5.18 ER70S-G wlding to be diameter that Lincoln produces be 1.2mm; It is AWS A5.23 F8A8-ENi 1K-Ni1 that capping wlding is filled in submerged-arc welding, and this AWS A5.23 F8A8-ENi 1K-Ni1 wlding is the diameter that Lincoln produces is the PREMIERWELD of 4.0mm
tMni 1K welding wire; Solder flux is 8500, and it is the corresponding PREMIER WELD of Lincoln's manufacturer production
tMthe supporting solder flux of Ni 1K welding wire;
Describedly determine that welding parameter comprises: preheat temperature is 110 DEG C, and interlayer temperature is 110 to 200 DEG C; When the diameter that manual electric arc welding adopts Lincoln to produce is Conarc 52 welding rod of 3.2mm, electric current 80 to 100A, voltage 20 to 22V; When the diameter that manual electric arc welding adopts refreshing steel to produce is the LB-52U welding rod of 3.2mm, electric current 90 to 110A, voltage 20 to 22V; When the diameter that Surface Tension Transition melting pole gas shielded arc welding (STT weldering) adopts Lincoln to produce is the JM-58 welding wire of 1.2mm, electric current 150 to 170A, voltage 18 to 20V; The diameter that submerged-arc welding adopts Lincoln to produce is the PREMIER WELD of 4.0mm
tMduring Ni 1K welding wire, electric current 400 to 600A, voltage 27 to 34V;
Described welding control is: first from front back cover in welding process, when positive plane tie completes the welding of about 1/3, or when joint occurs obviously to be out of shape, upset joint or direct direction overleaf start back chipping, till removing root defect completely; Then welding from the back side, until sealing run completes welding, has finally continued the remaining welding of positive plane tie.If find in whole welding process obvious distortion all can first welding piece just at the back side of solder side.
3. the submerged welding process under offshore engineering structure low temperature environment military service according to claim 1, it is characterized in that, described mother metal is the offshore engineering structure of being on active service in marine environment, this offshore engineering structure is included in the GB712 EH36-Z35 model steel that the thickness of being on active service in-25 DEG C or more temperature environments is 40 to 88mm, and the thickness of being on active service in-15 DEG C or more temperature environments is at the steel of the GB712DH36-Z35 model of 45 to 110mm.
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| CN105127557A (en) * | 2015-09-21 | 2015-12-09 | 蓬莱巨涛海洋工程重工有限公司 | Flux-cored gas shielded welding repair process for large and thick ocean engineering steel plate in low-temperature environment |
| CN106334860A (en) * | 2015-07-17 | 2017-01-18 | 烟台中集来福士海洋工程有限公司 | Welding technique for F690-grade steel plate |
| CN113909627A (en) * | 2021-09-30 | 2022-01-11 | 北京博清科技有限公司 | Automatic welding method, device, equipment and storage medium |
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