CN105081527B - A kind of vertical docking automatic soldering technique method of thin plate in 5%Ni steel - Google Patents
A kind of vertical docking automatic soldering technique method of thin plate in 5%Ni steel Download PDFInfo
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- CN105081527B CN105081527B CN201510319242.1A CN201510319242A CN105081527B CN 105081527 B CN105081527 B CN 105081527B CN 201510319242 A CN201510319242 A CN 201510319242A CN 105081527 B CN105081527 B CN 105081527B
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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
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
Abstract
The present invention relates to the vertical docking automatic soldering technique method of thin plate in 5%Ni steel, comprise the following steps：Thin plate is unilateral in a, two blocks of 5%Ni steel for needing welding opens correspondence groove, and leaves root face height；B, two pieces need stand butt-welded 5%Ni steel in thin plate group to point be welded timing formed Y type grooves, the additional contravariant shape code plate of Y type groove reverse side；C, using welding robot; use flux-cored arc welding; " rectangle " track swing welding is carried out in Y type groove welding beads; and do not stopped in the middle part of each welding bead; welding manner is DC pulse weldering, two-sided welding shaping; the welding of thin plate front is needed to carry out back root cleaning treatment after finishing in steel, and reverse side welding is then carried out again；Do not preheated before thin plate weldering in d, 5%Ni steel, each welding bead interlayer temperature control is below 150 DEG C.Can ensure that in the 5%Ni steel under vertical docking location that each weld seam of thin plate positive and negative full penetration, each bead thickness under Full-automatic welding be suitable, positive and negative appearance of weld is good, and then reach efficient welding purpose.
Description
Technical field
The present invention relates to the technical field of welding procedure, the vertical docking automatic welding of thin plate in specifically a kind of 5%Ni steel
Connect process.
Background technology
Mostly based on manual electric arc welding, the source of welding current is AC power, is applied for the domestic welding about low-temperature steels such as 5%Ni
According to thickness of slab and joint form during weldering, welded using multi-pass welding, string(er) bead, small specification.By welding material and weld heat input
Limitation, 5%Ni steel had not been met carries out the correlative study of automatic welding under vertical docking location using domestic flux-cored wire
Report.And traditional manual welding, it is not only cumbersome, simultaneously because artificial operation, exists uneven, steady in product quality
The shortcoming of qualitative difference, but also there are some potential safety hazards.
Under normal circumstances, the mode of metal transfer of the Ni fundamental mode flux-cored wires under direct current weldering pattern is generally spray transfer,
Weld metal viscosity is big when being welded under vertical docking location, be difficult to be sprawled to groove both sides and heap situation high in weld seam middle part is very dashed forward
Go out, trace it to its cause because the spray transfer critical electric current value under direct current weldering pattern is bigger than normal, cause heat input excessive；Add
The weld metal viscosity that Ni fundamental mode flux-cored wires are formed in itself is big, and the droplet metal under vertical docking location does not overcome gravity work
With and lower time or middle part heap it is high, finally cause molten bath it is uncontrollable, even if swing welding cannot also significantly improve.Also there is weldering simultaneously
Connect cannot penetration, appearance of weld is good, and the problem of splashing is also easy to produce in welding process.
The content of the invention
It is an object of the invention to provide a kind of vertical docking automatic soldering technique method of thin plate in improved 5%Ni steel, it
Can overcome in the prior art cannot automatic welding, inefficiency, while welding cannot penetration, not good some of appearance of weld are not
Foot.
To achieve these goals, the technical scheme is that：The vertical docking automatic welding work of thin plate in a kind of 5%Ni steel
Process, it is characterised in that：Described process comprises the following steps：A, two pieces need welding 5%Ni steel in thin plate list
While opening correspondence groove, and leave root face height；B, two pieces need to found butt-welded 5%Ni steel in thin plate group to point be welded timing
Retention gap, forms Y type grooves, and correspondence root gap, the additional contravariant shape code plate of the reverse side of thin plate in 5%Ni steel；C, adopt
With welding robot, using flux-cored arc welding, " rectangle " track swing welding is carried out in Y type groove welding beads, and
Do not stopped in the middle part of each welding bead, welding manner is DC pulse weldering, two-sided welding shaping, front welding needs to carry out instead after finishing
Face back chipping treatment, then carries out reverse side welding again；Do not preheated before thin plate weldering in d, 5%Ni steel, each welding bead interlayer temperature control exists
Less than 150 DEG C.
When using, groove of the present invention uses Y type grooves, is leaving appropriate gap and root face, the additional contravariant shape code plate of reverse side
Groove welding bead in so that welding gun carries out " rectangle " track swing welding during each welding bead welding of positive and negative, and in each weldering
Road middle part does not stop, and each weld seam of thin plate positive and negative is complete under Full-automatic welding in can ensure that the 5%Ni steel under vertical docking location
It is few that penetration, each bead thickness are suitable, positive and negative appearance of weld is good, welding process is splashed, equal without mechanics properties testing is undermined
Meet related request；Welding efficiency can be effectively improved again simultaneously, and then reaches efficient welding purpose.
Brief description of the drawings
Fig. 1 is slope type schematic diagram in one embodiment of the invention.
Fig. 2 is welding bead arrangement and back gouging schematic diagram in one embodiment of the invention.
Fig. 3 is torch swinging track schematic diagram in one embodiment of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Each label is expressed as follows in each accompanying drawing：It is 1 front backing run, 2 filling of groove front welding beads, 3 front final pass, 4 anti-
Thin plate in face welding bead, 5 contravariant shape code plates, 65%Ni steel.
The vertical docking automatic soldering technique method of thin plate, its area with prior art in a kind of 5%Ni steel of the present invention
It is not：Described process comprises the following steps：A, two pieces need welding 5%Ni steel in thin plate it is unilateral open correspondence slope
Mouthful, and leave root face height；B, two pieces need to found butt-welded 5%Ni steel in thin plate group to point be welded timing retention gap,
Form Y type grooves, and correspondence root gap, the additional contravariant shape code plate of the reverse side of thin plate in 5%Ni steel；C, using welding robot
People, using flux-cored arc welding, " rectangle " track swing welding is carried out in Y type groove welding beads, and in each welding bead
Portion does not stop, and welding manner is DC pulse weldering, two-sided welding shaping, and the welding of thin plate front needs to carry out reverse side after finishing in steel
Back chipping treatment, then carries out reverse side welding again；Do not preheated before thin plate weldering in d, 5%Ni steel, each welding bead interlayer temperature control is 150
Below DEG C.
In a steps, in the steel plate of 10-20mm scopes, the unilateral processing of steel plate leaves thin plate dinger thickness degree in described 5%Ni steel
The root face height of 1.5-2.5mm；The unilateral angular range for opening correspondence groove is 25-35 °.In the mode for more optimizing, thin plate in steel
Unilateral processing leaves the root face height of 1.8-2.2mm, and the unilateral angular range for opening correspondence groove is 28-32 °.In b step, Y types
Bevel angle scope is 50-70 °, and wherein the suitable groove scope of the 5%Ni steel plates in 10-15mm thickness ranges is 50-
60 °, and the suitable groove scope of 5%Ni steel plates in 16-20mm thickness ranges is 60-70 °, is kept when spot welding is assembled before weldering
The gap length of 2-3.5mm；In step c, during welding, dry extension of electrode is maintained between 13-15mm, and welding wire is in each welding bead
Heart position simultaneously ensures alignment, and welding wire termination is apart from striking point 2-3mm." rectangle " track swing is applied in described Y type groove welding beads
Weldering refers to that, from backing run to final pass, in the case where ensureing that torch swinging length is constant in each welding bead, corresponding adjustment is put
Dynamic amplitude and the rectangular path welding method of both sides residence time.
In step c, after each welding bead welding in front is finished, unload contravariant shape code plate and carry out back root cleaning treatment, reverse side
Back chipping treatment forming width is 11-12mm, depth is 3-4mm circular grooves, and the circular groove position is relative with gap
Should, welding gun continues to carry out " rectangle " track pendulum in the reverse side welding bead of circular groove formation immediately after the completion of back root cleaning treatment
Dynamic welding, weld width is 17-18mm after the completion of reverse side pass weld, and reinforcement is 3-4mm.
In step c, during welding, welding bead is successively superimposed, and bottom is backing run, and middle part is filler pass, and top is capping
Welding bead, needs to carry out scarfing cinder treatment between welding bead；Reverse side welding bead welding also carries out removing surface after finishing.
Backing run wobble length is 1.5mm, amplitude of oscillation size is 2.5mm, the both sides residence time is 0.25s, welding electricity
Flow for 115-125A, weldingvoltage be 16.2-17.5V, speed of welding be 0.32m/min；
Filler pass wobble length is 1.5mm, amplitude of oscillation size is 4.5mm, the both sides residence time is 0.25s, welding electricity
Flow for 125-140A, weldingvoltage be 16.2-17.5V, speed of welding be 0.35m/min；
Final pass wobble length is 2mm, amplitude of oscillation size is 5.5mm, the both sides residence time is 0.2s, and welding current is
130-140A, weldingvoltage are 16.2-17.5V, speed of welding is 0.5m/min；
Reverse side welding bead wobble length 1.5mm, amplitude of oscillation size are 5mm, the both sides residence time is 0.25s, and welding current is
130-140A, weldingvoltage are 16.2-17.5V, speed of welding is 0.45m/min；
Ф 1.2mm flux-cored wires are selected in each welding bead welding above, and with 98%Ar+2%O2Gaseous mixture is protective gas, gas
Flow is 18-19L/min.
During welding, using DC pulse weldering and existing Ni fundamental modes (Ni-Cr-Mo systems alloy) flux-cored wire, model TMS-
5T is welding material, 98%Ar+2%O2Gaseous mixture is protective gas.DC pulse weldering is sharp i.e. on the basis of original DC mode
Cause that deep molten interaction with solidification is carried out with the different heat input rates of pulse shaping, critical current is finally less than with overall average electric current
In the case of value (being changed into the current value of spray transfer from drop-wise transition), the controllable spray transfer in molten bath is obtained.Pulse Width Control transition
Technology has the advantages that to improve thermal weld stress and spray transfer, it can be ensured that the Ni fundamental mode flux-cored wire molten drops in the case of vertical docking
While metal can effectively overcome gravity, be sprawled to groove both sides and depth, deposition efficiency can be improved again.In addition and Pulse Width Control
The 98%Ar+2%O that transitional technology matches2Mixing gas shielded advantage is a small amount of oxygen to be added in argon gas, due to O2It is table
Face active element, can reduce the surface tension of liquid metal, reduce the critical current of generation spray transfer, refine molten drop chi
It is very little, improve melt-extracted steel fibre.In addition, because gaseous mixture has certain oxidisability, therefore can stabilization and control arc cathode spot
The position of point, can so avoid making because cathode protection is travelling electric arc produce wave, the droplet transfer is unstable, gas shield is acted on
The problems such as destroyed and appearance of weld is irregular and generates undercut, incomplete fusion.
Corresponding Liquid penetrant testing of making to weld seam does not find excessive defect with ray detection, and CB3958/-2004/ is met respectively
II grade with the evaluation requirement of II grade of CB/T3558-2011B；Welding point tensile strength is 576MPa, during -115 DEG C of test temperature,
Weld impingement work(is 117J, and melt run ballistic work is 311J, and the outer 2mm ballistic works of melt run are 292J, the outer 5mm ballistic works of melt run
It is 301J, welding point bending property is good, face is curved, carry on the back curved D=4t, and 180 ° any defect do not occur.Amplify after corrosion test
800 times of joint weldings for observing macrocorrosion sample and heat affected area surface do not find macroscopic crackle, incomplete fusion etc.
Defect.
Embodiment 1
As shown in figure 1, thin plate is vertical in a kind of 5%Ni steel docks automatic soldering technique method, thin plate in described 5%Ni steel
Thickness is 15mm：
1) 30 ° of the unilateral bevel of test plate (panel), leaves the root face height of 1.5-2.5mm；
2) the test plate (panel) group to point timing that is welded leaves the gap length of 2-3.5mm；
3) the additional contravariant shape code plate of reverse side, to ensure gap length.
The gap length that test plate (panel) processing root face height mismachining tolerance keeps 2-3mm when being assembled no more than spot welding before 1mm, weldering is simultaneously
The additional contravariant shape code plate of test plate (panel) reverse side is relied on to be maintained.Test plate (panel) group to point is welded to match somebody with somebody and is also completed with Ni fundamental modes welding wire, before weldering
The gap length of 2-3mm is kept when spot welding is assembled and is relied on the additional contravariant shape code plate of test plate (panel) reverse side and is maintained.
Shown in Fig. 2 and Fig. 3, including the specific welding step of the test plate (panel)：
1) weld when, dry extension of electrode is maintained between 13-15mm, welding wire be in each welding bead center and ensure it is right
Standard, welding wire termination is apart from striking point 2-3mm；
2) such that welding gun carries out " rectangle " track swing welding during each welding bead welding along welding bead, and in each welding bead
Portion does not stop；
3) each welding bead welding more than is matched somebody with somebody from production domesticization Ni fundamental mode (Ni-Cr-Mo systems alloy) Ф 1.2mm flux-cored wires
98%Ar+2%O2Gaseous mixture is protective gas, throughput is 18-19L/min.Do not preheated before steel plate weldering, each welding bead interlayer temperature
Control below 150 DEG C, need to carry out scarfing cinder treatment between welding bead.
4) welding process neutrality banjo fixing butt jointing at welding bead arrangement and each technological parameter as shown in Figures 2 and 3, each welding bead work
Skill parameter is as shown in the table.
During robot welding, operating personnel call the prior program for writing or write new journey by teaching
Sequence, subscription procedure setting is carried out after the completion of programming debugging, and the operation of welding robot is controlled by starter.
Each welding bead in 5%Ni steel test plate (panel) grooves under vertical docking location, ensured by the gap assembling of test plate (panel) before weldering,
Advance reversible deformation control, with reference to DC pulse weldering, 98%Ar+2%O2The Rational choice of each technological parameter under mixing gas shielded, most
Ensure to be carried out under scarfing cinder disposition between two-sided welding, back root cleaning, welding bead eventually, it is welding line joint root full penetration, positive and negative
Each welding bead shaping in face is excellent, and automatic welding simplifies workflow, effectively increases low-temperature steel welding quality and production efficiency.
The DC pulse weldering of use causes that deep molten interaction with solidification is carried out using the different heat input rates of pulse shaping, most
Eventually with overall average electric current less than in the case of critical electric current value (being changed into the current value of spray transfer from drop-wise transition), obtaining molten bath can
The spray transfer of control.Selected 98%Ar+2%O2O in mixing gas shielded2With surface active element, liquid gold can be reduced
The surface tension of category, reduces the critical current of generation spray transfer, refines droplet size, improves melt-extracted steel fibre.Institute
The welding procedure of use drops down under substantially slowing down liquid metals of the Ni fundamental modes wlding under spray transfer form, the phenomenon such as excessive；
Promote it more efficiently to be sprawled to welding bead both sides and depth, realize the Fast Filling of deposited metal while ensuring that welding connects
Head quality.It is few that each weld seam full penetration, each bead thickness are suitable, positive and negative appearance of weld is good, welding process is splashed, and nothing is undermined
Mechanics properties testing meets related request.So that middle thin plate 5%Ni steel uses production domesticization Ni fundamental mode medicines under vertical docking location
Core welding wire carries out automatic welding and popularization and application are possibly realized.
Embodiment 2
A kind of vertical docking automatic soldering technique method of thin plate in 5%Ni steel, lamella thickness is in described 5%Ni steel
13mm：
1) 28 ° of the unilateral bevel of test plate (panel), leaves the root face height of 1.8mm；
2) the test plate (panel) group to point timing that is welded leaves the gap length of 2.8mm；
3) the additional contravariant shape code plate of reverse side, to ensure gap length.
The gap length that test plate (panel) processing root face height mismachining tolerance keeps 2.8mm when being assembled no more than spot welding before 1mm, weldering is simultaneously
The additional contravariant shape code plate of test plate (panel) reverse side is relied on to be maintained.Test plate (panel) group to point is welded to match somebody with somebody and is also completed with Ni fundamental modes welding wire, before weldering
The gap length of 2.5mm is kept when spot welding is assembled and is relied on the additional contravariant shape code plate of test plate (panel) reverse side and is maintained.
The specific welding step of thin plate in the steel：
1) weld when, dry extension of electrode is maintained between 13-15mm, welding wire be in each welding bead center and ensure it is right
Standard, welding wire termination is apart from striking point 3mm；
2) such that welding gun carries out " rectangle " track swing welding during each welding bead welding along welding bead, and in each welding bead
Portion does not stop；
3) each welding bead welding more than is matched somebody with somebody from production domesticization Ni fundamental mode (Ni-Cr-Mo systems alloy) Ф 1.2mm flux-cored wires
98%Ar+2%O2Gaseous mixture is protective gas, throughput is 18-19L/min.Do not preheated before steel plate weldering, each welding bead interlayer temperature
Control below 150 DEG C, need to carry out scarfing cinder treatment between welding bead.
The vertical docking automatic soldering technique method of thin plate, has the following advantages in 5%Ni steel of the present invention：1) used
DC pulse weldering causes that deep molten interaction with solidification is carried out using the different heat input rates of pulse shaping, finally with overall average electric current
In the case of critical electric current value (being changed into the current value of spray transfer from drop-wise transition), the controllable spray transfer in molten bath is obtained.
2) 98%Ar+2%O selected by2O in mixing gas shielded2With surface active element, the surface of liquid metal can be reduced
Power, reduces the critical current of generation spray transfer, refines droplet size, improves melt-extracted steel fibre.3) weldering for being used
Dropped down under connecing technique and substantially slowing down liquid metals of the Ni fundamental modes wlding under spray transfer form, the phenomenon such as excessive；Promote it more
Plus effectively sprawl to welding bead both sides and depth, the Fast Filling of deposited metal is realized while ensuring that quality of weld joint.
4) it is few that each weld seam full penetration, each bead thickness are suitable, positive and negative appearance of weld is good, welding process is splashed, and nothing undermines mechanics
Performance detection meets related request.5) thin plate uses production domesticization Ni fundamental mode medicine cores under vertical docking location in causing 5%Ni steel
Welding wire carries out automatic welding and is possibly realized.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Present invention specific implementation is confined to above-mentioned these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, some simple deduction or replace can also be made, the present invention should be all considered as belonging to
Protection domain.
Claims (4)
1. thin plate is vertical in a kind of 5%Ni steel docks automatic soldering technique method, it is characterised in that：Described process is included such as
Lower step：Thin plate is unilateral in a, two blocks of 5%Ni steel for needing welding opens correspondence groove, and leaves root face height, described 5%Ni
In the steel plate of 10-20mm scopes, the unilateral processing of thin plate leaves the root face height of 1.8-2.2mm to thin plate dinger thickness degree in steel in steel, single
While the angular range for opening correspondence groove is 28-32 °；B, two pieces need to found butt-welded 5%Ni steel in thin plate group to point be welded and match somebody with somebody
When retention gap, formed Y type grooves, and correspondence root gap, the additional contravariant shape code plate of the reverse side of thin plate in 5%Ni steel；C, adopt
With welding robot, using flux-cored arc welding, " rectangle " track swing welding in Y type groove welding beads, and each
Welding bead middle part does not stop, and welding manner is DC pulse weldering, two-sided welding shaping, and front welding needs to carry out reverse side clear after finishing
Root treatment, then carries out reverse side welding again, wherein, after each welding bead welding in front is finished, unload contravariant shape code plate and carry out anti-
Face back chipping treatment, back root cleaning treatment forming width is 11-12mm, depth is 3-4mm circular grooves, the circular groove
Position is corresponding with gap, and welding gun continues to enter in the reverse side welding bead of circular groove formation immediately after the completion of back root cleaning treatment
Row " rectangle " track swing welding；During welding, it is welding to use Ni fundamental mode Ni-Cr-Mo systems alloys flux-cored wire, model TMS-5T
Material, 98%Ar+2%O2Gaseous mixture is protective gas；Do not preheated before thin plate weldering in d, 5%Ni steel, each welding bead interlayer temperature control exists
Less than 150 DEG C.
2. thin plate is vertical in a kind of 5%Ni steel according to claim 1 docks automatic soldering technique method, it is characterised in that：b
In step, Y type bevel angles scope is 50-70 °, the wherein suitable groove model of the 5%Ni steel plates in 10-15mm thickness ranges
It is 50-60 ° to enclose, and the suitable groove scope of 5%Ni steel plates in 16-20mm thickness ranges is 60-70 °, spot welding assembling before weldering
When keep 2-3.5mm gap length；In step c, during welding, dry extension of electrode is maintained between 13-15mm, and welding wire is in each
Welding bead center simultaneously ensures alignment, and welding wire termination is apart from striking point 2-3mm.
3. thin plate is vertical in a kind of 5%Ni steel according to claim 1 docks automatic soldering technique method, it is characterised in that：c
In step, during welding, welding bead is successively superimposed, and bottom is backing run, and middle part is filler pass, and top is final pass, welding bead
Between need to carry out scarfing cinder treatment；Reverse side welding bead welding also carries out removing surface after finishing；Backing run wobble length be 1.5mm,
Amplitude of oscillation size is 2.5mm, the both sides residence time is 0.25s, and welding current is 115-125A, weldingvoltage is 16.2-
17.5V, speed of welding are 0.32m/min；When filler pass wobble length is 1.5mm, amplitude of oscillation size is 4.5mm, both sides stop
Between be 0.25s, welding current is that 125-140A, weldingvoltage are that 16.2-17.5V, speed of welding are 0.35m/min；Capping
Welding bead wobble length is 2mm, amplitude of oscillation size is 5.5mm, the both sides residence time is 0.2s, and welding current is 130-140A, weldering
Voltage is connect for 16.2-17.5V, speed of welding are 0.5m/min；Reverse side welding bead wobble length 1.5mm, amplitude of oscillation size are 5mm, two
The side residence time is 0.25s, and welding current is 130-140A, weldingvoltage is 16.2-17.5V, speed of welding is 0.45m/
min；Ф 1.2mm flux-cored wires are selected in each welding bead welding above, and with 98%Ar+2%O2Gaseous mixture is protective gas, throughput is
18-19L/min。
4. thin plate is vertical in a kind of 5%Ni steel according to claim 1 docks automatic soldering technique method, it is characterised in that：c
In step, " rectangle " track swing welding refers to and, from backing run to final pass, is ensureing to weld in described Y type groove welding beads
In the case that torch swinging length is constant in road, corresponding adjustment amplitude of fluctuation and the rectangular path welding side of both sides residence time
Method.
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| JPS61206572A (en) * | 1985-03-07 | 1986-09-12 | Ishikawajima Harima Heavy Ind Co Ltd | All position welding method of stainless steel |
| CN101362246A (en) * | 2008-09-23 | 2009-02-11 | 四川电子焊接设备公司 | Pulse energy control method for carbon dioxide shield-arc welding and drug-core no gas welding |
| JP2010120022A (en) * | 2008-11-17 | 2010-06-03 | Nippon Steel Corp | Fillet arc welding method of thin steel sheet |
| CN102941397A (en) * | 2012-10-09 | 2013-02-27 | 中冶南方(武汉)威仕工业炉有限公司 | Argon tungsten arc welding method for nickel-based alloy |
| CN104014914A (en) * | 2014-06-04 | 2014-09-03 | 浙江省海洋开发研究院 | Welding method for high-strength steel in hull structure |
| CN104607775A (en) * | 2015-01-21 | 2015-05-13 | 鲁西工业装备有限公司 | Automatic submerged arc welding method for nickel alloy composite board |
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