CN108608093A - A kind of vertical docking automatic soldering method of two phase stainless steel - Google Patents
A kind of vertical docking automatic soldering method of two phase stainless steel Download PDFInfo
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- CN108608093A CN108608093A CN201810385023.7A CN201810385023A CN108608093A CN 108608093 A CN108608093 A CN 108608093A CN 201810385023 A CN201810385023 A CN 201810385023A CN 108608093 A CN108608093 A CN 108608093A
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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
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- B23K9/095—Monitoring or automatic control of welding parameters
-
- 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
Abstract
The present invention discloses a kind of vertical docking automatic soldering method of two phase stainless steel, includes the following steps：Step S10, two blocks of two-phase stainless steel plates to be docked are provided, open up single side V-butt in the docking location of two blocks of two-phase stainless steel plates, the angle of groove is 55 ° 65 °, and the gap of groove is 4 12mm, and liner is arranged in the back side of groove；Step S20, by CO2Welding gun is fixed on wig-wag, and wig-wag drives CO when automatic welding2Welding gun just carries out swing welding from groove in face of groove, and prime coat, filled layer and capping layer are sequentially formed in groove.It can improve two-phase stainless steel plate and found the welding efficiency of butt weld and can effectively improve the welding quality of groove.CO can only be used by changing vertical be docked in traditional welding of two phase stainless steel2The technology of semiautomatic welding reduces soldered polishing work when welding, improves welding efficiency.
Description
Technical field
The present invention relates to shipbuilding technical field more particularly to a kind of vertical docking automatic soldering methods of two phase stainless steel.
Background technology
Chemical tanker belongs to one of high-tech, ship type of high added value, and construction is increasingly extensive, this ship type usually requires to adopt
It is manufactured with two phase stainless steel.Two phase stainless steel has the characteristics of austenite and ferritic stainless steel concurrently, has good corrosion resistant
Corrosion energy and abrasion resistance properties, but it requires extremely harshness to the heat input of welding.If heat input is too big when welding, weld seam heat
Zone of influence range increases, and metallographic structure also tends to coarse grains, disorder, causes embrittlement, is mainly shown as the plasticity of welding point
Index declines.If thermal weld stress is too small, causes hardened structure and be also easy to produce crackle, it is equally unfavorable to the impact flexibility of HAZ.It is logical
Often, the heat input value of two phase stainless steel opposition welding needs to control in 0.5-2.5kj/mm on chemical tanker.Stainless steel chemicals
Ship is when assembling and overlapping stage construction, there are the vertical welding to position of many two phase stainless steels, the vertical contraposition of traditional carrying stage
What the welding set used is all Large Heat Input Welding, and thermal weld stress is in 10kj/mm or more, therefore for double on chemical tanker
Phase stainless steel can only use semi-automatic CO2Protective gas is welded.But during the welding process due to the number of plies of welding
It is more, semi-automation CO is used in actual work progress2Protective gas welds, and welding efficiency is relatively low；In addition, semi-automatic CO2Gas
Body protection weldering belongs to manual operations, more demanding for technical ability, the sense of responsibility of welder itself, and the roads welding Shi Ceng number need to arrange conjunction
It manages, weld defect can carry out down welding together after must removing in the welding process, and stability of the welding quality is relatively poor.
Invention content
It is an object of the present invention to：A kind of vertical docking automatic soldering method of two phase stainless steel is provided, can be improved double
Phase stainless steel plate founds the welding efficiency of butt weld.
It is another object of the present invention to：A kind of vertical docking automatic soldering method of two phase stainless steel, this method energy are provided
Enough effectively improve the welding quality of groove.
To reach this purpose, the present invention uses following technical scheme：
A kind of vertical docking automatic soldering method of two phase stainless steel is provided, is included the following steps：
Step S10, two blocks of two-phase stainless steel plates to be docked are provided, in the docking location of two blocks of two-phase stainless steel plates
Single side V-butt is opened up, the angle of the groove is 55 ° -65 °, and the gap of the groove is 4-12mm, in the back of the body of the groove
Face setting liner；
Step S20, by CO2Welding gun is fixed on wig-wag, and when automatic welding, the wig-wag drove the CO2Welding gun from
The groove just carries out swing welding in face of the groove, and sequentially form in the groove prime coat, filled layer and
Capping layer.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, in the step
It is specifically included in S20：
Step S21, it is welding current 150-160A, weldingvoltage 22- in the welding condition for welding the prime coat
24V, speed of welding 100-110mm/min；
Step S22, it is 160-180A, weldingvoltage to weld the welding condition of the filled layer be welding current
23-25V, speed of welding 115-125mm/min；
Step S23, it is welding current 160-170A, weldingvoltage 23- in the welding condition for welding the capping layer
25V, speed of welding 108-127mm/min.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, the CO2Weldering
The width direction of rifle groove described in the driving lower edge of the wig-wag is swung.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, the groove tool
There are the first groove side and the second groove side being oppositely arranged, the CO2Welding gun is successively in first groove side, described
It is swung between the centre position of groove and second groove side；
Or, the CO2Welding gun is successively on second groove side, the centre position of the groove and first slope
Mouth is swung between side.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, the CO2Weldering
Rifle is 0.4-0.5s, the CO in first groove side residence time2Welding gun is stopped in first groove side
Time is 0.4-0.5s, the CO2Welding gun is 0.1-0.2s in the centre position residence time of the groove.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, in the step
In S20, the CO2By the way of multi-layer welding, multilayer welding is formed in the groove when to the groove welding for welding gun
The height of channel layer, each welding bead layer is respectively less than 6mm.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, in the step
In S21, the CO2Welding gun is 70 beats/min in the hunting frequency for welding the prime coat；
And/or in the step S22, the CO2Welding gun the hunting frequency for welding the filled layer be 40-50 times/
Minute；
And/or in the step S23, the CO2Welding gun the hunting frequency for welding the capping layer be 40-50 times/
Minute.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, two pieces described double
The thickness of phase stainless steel plate is 9-36mm.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, the liner is
Ceramic substrate or copper lining.
As a kind of preferred technical solution of the vertical docking automatic soldering method of the two phase stainless steel, in the step
After S20, further includes step S30, cleaning, clear up the welding residue of the circumference of the liner and the capping layer, and by the lid
The surface of face layer polishes smooth.
Beneficial effects of the present invention are：Automatic welding rate is to weigh a shipbuilding enterprise production in shipbuilding industry
The important indicator of ability drives CO in the vertical docking automatic soldering method of two phase stainless steel of the present invention by wig-wag2
Welding gun can realize chemical tanker in the automatic welding for assembling or carrying two-phase stainless steel plate abutment joint in phase process.Change
Vertical be docked in traditional welding of two phase stainless steel can only use CO2The technology of semiautomatic welding, when greatly reducing welding
Soldered polishing work, largely improves work efficiency, while ensure that welding quality.In the present solution, the weldering being layered
The method of connecing can be convenient for the temperature of control prime coat, filled layer and capping layer, further increase welding quality.
Description of the drawings
Below according to drawings and examples, invention is further described in detail.
Fig. 1 is the structural schematic diagram of groove described in embodiment.
Fig. 2 is that liner described in embodiment pastes schematic diagram.
Fig. 3 is the welding process schematic diagram of the groove.
Fig. 4 is the welding bead distribution map after the completion of the groove welding.
In figure：
1, two-phase stainless steel plate；2, groove；3, prime coat；4, it pads；41, groove；5, filled layer；51, the first filled layer；
52, the second filled layer；6, wig-wag；7、CO2Welding gun；71, welding wire；8, capping layer；81, the first capping layer；82, the second capping
Layer.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
As shown in figures 1-4, in this present embodiment, the vertical docking automatic welding side of a kind of two phase stainless steel of the present invention
Method, this approach includes the following steps, step S10, provide two blocks of two-phase stainless steel plates 1 to be docked, two pieces of two-phases not
The docking location of rust steel plate 1 opens up single side V-butt 2, and the angle [alpha] of the groove 2 is 55 ° -65 °, the gap H of the groove 2
For 4-12mm, in the back side of the groove 2, setting pads 4；
Step S20, by CO2Welding gun 7 is fixed on wig-wag 6, and when automatic welding, the wig-wag 6 drove the CO2Welding gun
7 just carry out swing welding from the groove 2 in face of the groove 2, and prime coat 3, filling are sequentially formed in the groove 2
Layer 5 and capping layer 8.Automatic welding rate is to weigh the important finger of a shipbuilding enterprise production capacity in shipbuilding industry
Mark, in the vertical docking automatic soldering method of two phase stainless steel of the present invention, by wig-wag 6 to CO2Welding gun 7 is controlled
System can realize chemical tanker in the automatic welding for assembling or carrying 1 abutment joint of two-phase stainless steel plate in phase process.It changes
Vertical be docked in traditional welding of two phase stainless steel can only use CO2The technology of semiautomatic welding greatly reduces weldering when welding
Seam polishing work, improves working efficiency, while ensure that welding quality.By using this method in specific work progress
The groove 2 that soldering diphasic stainless steel plate 1 is formed is realized the automatic welding that the vertical docking of two phase stainless steel is realized, is effectively improved
The automatic welding rate of shipyard, and virtually improve the competitiveness of shipyard.In the present solution, the welding method of layering can
Convenient for the temperature of control prime coat 3, filled layer 5 and capping layer 8, welding quality is further increased.Specifically, CO2On welding gun 7
Welding wire 71 is set, makes CO under the control of wig-wag 62The swing of welding gun 7, to drive the swing of welding wire 71.In the present solution,
Utilize CO2Gas shielded arc welding makes groove 2 have smaller stomata, is further ensured that welding quality.
Wherein, it is specifically included in the step S20：
Step S21, it is welding current 150-160A, weldingvoltage 22- in the welding condition for welding the prime coat 3
24V, speed of welding 100-110mm/min, heat input range 1.8-2.3kJ/mm,
Step S22, it is 1.6-2.4A, weldingvoltage to weld the welding condition of the filled layer 5 be welding current
23-25V, speed of welding 115-125mm/min, heat input range 1.6-2.4kJ/mm；
Step S23, it is welding current 160-170A, weldingvoltage 23- in the welding condition for welding the capping layer 8
25V, speed of welding 108-127mm/min, heat input range 1.6-2.4kJ/mm.
By the characteristic of two phase stainless steel itself it is found that the austenite in two phase stainless steel and ferritic content substantially close to
In balance, the sensibility of welding cold cracking and fire check is all smaller, the mechanical property and corrosion resistance of two phase stainless steel plumb joint
Can depend on welding point keep Phase Proportion appropriate.Two phase stainless steel is 100% ferrite at high temperature, if heat input
Too small, heat affected area cooling velocity is fast, and austenite has little time excessive ferrite is precipitated and will excessively be remained behind under greenhouse；
If heat input is excessive, cooling velocity is too slow, although enough austenites can be obtained, can also cause the ferrite of heat affected area
Crystal grain is grown up and the precipitation of the equal poisonous metal phases of σ, causes connector brittle.Due to two phase stainless steel have more than characteristic,
It needs strictly to control welding condition when welding the two-phase stainless steel plate 1, so that weld heat input is to institute
The balance for stating the duplex structure of two-phase stainless steel plate 1 is preferably controlled.By the step S21, the step S22,
Control to the welding current of welding procedure, weldingvoltage and speed of welding respectively in the step S23, can realize pair
The size of heat input is controlled, and the prime coat 3 of groove 2, the plasticity index of filled layer 5 and capping layer 8 and impact are improved
Toughness.
The CO2The width direction of the groove 2 described in the driving lower edge of the wig-wag 6 of welding gun 7 is swung.Utilize wig-wag
6 driving CO2Welding gun 7 so that CO2Welding wire 71 on welding gun 7 is accurately welding groove 2.Since capping layer 8 is positioned at close
The front of groove 2, and close to open end of the groove 2 far from the liner 4, when the capping layer 8 to groove 2 welds, CO2
Welding gun 7 drives welding wire 71 to be swung along the width direction of groove 2, and welding wire 71 is made to be leaned on respectively to the two-phase stainless steel plate 1 of 2 both sides of groove
Closely, welding wire 71 is dropped onto in groove 2 and is accumulated to the edge placement of the two-phase stainless steel plate 1, and capping layer 8 is close to the opening
Edge placement of the upper end at end towards the two-phase stainless steel plate 1 extends, and forms the edge placement with 1 surface of two-phase stainless steel plate
The extension of contact ensure that the adhesive strength of capping layer 8 and the surface of two-phase stainless steel plate 1.
Specifically, the groove 2 has the first groove side and the second groove side being oppositely arranged, the CO2Welding gun 7
It is swung between the first groove side, the centre position of the groove and second groove side successively.In the present embodiment
In, first groove side refers to groove 2 adjacent to the position of one of two-phase stainless steel plate 1, second groove side
While referring to groove 2 adjacent to the position of another block of two-phase stainless steel plate 1.As the CO2Welding gun 7 is to the prime coat 3, described
When filled layer 5 and the capping layer 8 weld, the CO2Welding gun 7 is when welding the groove 2 using the side of multi-layer welding
Formula, forms multilayer welding channel layer in the groove 2, and the height of each welding bead layer is respectively less than 6mm.It, can by this design
Control the temperature of welding bead layer, it is ensured that welding quality.Wherein, it may include several welderings in prime coat 3, filled layer 5 and capping layer 8
Channel layer, in Specific construction, can by the number of the welding bead layer in prime coat 3, filled layer 5 or capping layer 8 be one, two, three
It is a or more.
As a kind of preferred scheme of the vertical docking automatic soldering method of the two phase stainless steel, the CO2Welding gun 7 is in institute
It is 0.4-0.5s, the CO to state the first groove side residence time2Welding gun 7 is in second groove side residence time
0.4-0.5s, the CO2Welding gun 7 is 0.1-0.2s in the centre position residence time of the groove 2.Due to the weldering of groove 2
Channel layer and the adhesive strength of two blocks of two phase stainless steels require higher, to ensure the knot of the docking of two blocks of two-phase stainless steel plates 1
Structure intensity, by by CO2Welding gun 7 is disposed as 0.4-0.5s in the first groove side and the second groove side residence time,
It enables to fall more in welding wire 71 amount of the groove 2 close to 1 side of two-phase stainless steel plate, improves welding bead layer and two phase stainless steel
The adhesive strength of plate 1.CO2Welding gun 7 is in the first groove side and the second groove side residence time and CO2Welding gun 7 is in groove 2
Centre position residence time it is identical, in specific welding process, filled layer 5 forms the first filled layer 51 in the groove 2
And the second filled layer 52 contacted with 51 face of the first filled layer, capping layer 8 formed in the groove 2 first capping layer 81 with
And the second capping layer 82 contacted with the face, the presence of groove 2 of the prime coat 3 due to padding 4 and the back side, only in groove 2
One layer of prime coat 3 of interior formation.It is worth noting that, the centre position of groove 2 of the present invention refers to 2 face of groove at the back side
The position of groove 2.Preferably, it the first filled layer 51, the second filled layer 52, the first capping layer 81, the second capping layer 82 and beats
Bottom 3 plays that a welding position is set and only welding position is set not exactly the same, avoids the accumulation of weak point in each layer.Prime coat 3 and filled layer 5
Interface, filled layer 5 and the interface of capping layer 8, the interface of the first filled layer 51 and the second filled layer 52 and the first lid
Line between face layer 81 and the interface of the second capping layer 82 is non-rectilinear, and above-mentioned interface is not fully in always
On line.
Wherein, in the step S21, the CO2Welding gun 7 is 70 beats/min in the hunting frequency for welding the prime coat 3
Clock.In the step S22, the CO2Welding gun 7 is 40-50 beats/min in the hunting frequency for welding the filled layer 5.Institute
It states in step S23, the CO2Welding gun 7 is 40-50 beats/min in the hunting frequency for welding the capping layer 8.
In this present embodiment, the thickness of two blocks of two-phase stainless steel plates 1 is 9-36mm.Specifically, prime coat 3, filling
The thickness of layer 5 and capping layer 8 is arranged as required in practice of construction, when the single welding bead of the welding in corresponding welding bead layer
When the height of layer is less than the thickness of prime coat 3, filled layer 5 or capping layer 8, prime coat 3, filled layer 5 or capping layer 8 is needed to carry out
The welding of multiple welding bead layers, so that the corresponding thickness etc. total to all welding bead layers in prime coat 3, filled layer 5 or capping layer 8
In the thickness of corresponding prime coat 3, filled layer 5 or capping layer 8 setting.But corresponding prime coat 3, filled layer 5 or
The welding of each layer of welding bead layer of capping layer 8 is all that substep carries out, i.e., by corresponding prime coat 3, filled layer 5 or capping layer
After the completion of first welding bead layer welding in 8, CO2Welding gun 7 is moved along the length direction of groove 2, in 2 length direction of groove
On in the neighbouring position of the welding bead layer carry out welding next time, after the completion of welding bead layer welding at this, CO2Welding gun 7 returns again
It returns the welding bead layer of last welding and continues to weld next layer of welding bead layer on the surface of the welding bead layer, thicken the strong of the welding bead layer
Degree, and so on, until the thickness that the summation of each layer welding bead layer meets the corresponding prime coat 3, filled layer 5 or capping layer 8 is wanted
It asks.It, can be in butt welding channel layer by the welding of switching in turn on 2 length direction of groove between the welding bead layer on different location
Temperature cool down, and take full advantage of CO2Welding gun 7 also improves the rate of welding while improving welding effect.
Preferably, the liner 4 is ceramic substrate or copper lining.Liner 4 is ceramic substrate in the present embodiment.
Further, liner 4 is arranged fluted 41 close to the side of groove 2, and the width of groove 41 is more than 2 back side of groove
The width in gap.By the way that groove 41 is arranged on liner 4, it can be that welding wire 71 provides weld seam overflow volume and heat conduction space, have
It prevents to effect and generates bubble in commissure, improve the quality of weld seam.Preferably, groove 41 is to be directed away from 2 side of groove
Recessed arcuate structure.
After the step S20, the vertical docking automatic soldering method of the two phase stainless steel further includes S30, after welding treatment,
The welding residue of the circumference of the liner 4 and the capping layer 8 is cleared up, and the surface of the capping layer 8 is polished smooth.Specifically
, the flush of capping layer 8 side surface and two blocks of two-phase stainless steel plates 1 can be made by polishing, keeps good aesthetics.
In description herein, it is to be understood that term " first ", " second " are only used for being distinguish in description,
Without particular meaning.
It is to be understood that above-mentioned specific implementation mode is only that presently preferred embodiments of the present invention and institute's application technology are former
Reason, in technical scope disclosed in this invention, variation that any one skilled in the art is readily apparent that or
It replaces, should all cover within the scope of the present invention.
Claims (10)
1. a kind of vertical docking automatic soldering method of two phase stainless steel, which is characterized in that include the following steps：
Step S10, two blocks of two-phase stainless steel plates to be docked are provided, opened up in the docking location of two blocks of two-phase stainless steel plates
The angle of single side V-butt, the groove is 55 ° -65 °, and the gap of the groove is 4-12mm, is set in the back side of the groove
Set liner；
Step S20, by CO2Welding gun is fixed on wig-wag, and when automatic welding, the wig-wag drove the CO2Welding gun is from described
Groove just carries out swing welding in face of the groove, and prime coat, filled layer and capping are sequentially formed in the groove
Layer.
2. the vertical docking automatic soldering method of two phase stainless steel according to claim 1, which is characterized in that in the step
It is specifically included in S20：
Step S21, it is welding current 150-160A, weldingvoltage 22-24V in the welding condition for welding the prime coat,
Speed of welding 100-110mm/min；
Step S22, it is 160-180A, weldingvoltage 23- to weld the welding condition of the filled layer be welding current
25V, speed of welding 115-125mm/min；
Step S23, it is welding current 160-170A, weldingvoltage 23-25V in the welding condition for welding the capping layer,
Speed of welding 108-127mm/min.
3. the vertical docking automatic soldering method of two phase stainless steel according to claim 2, which is characterized in that the CO2Welding gun exists
The width direction of groove described in the driving lower edge of the wig-wag is swung.
4. the vertical docking automatic soldering method of two phase stainless steel according to claim 3, which is characterized in that the groove has
The the first groove side and the second groove side being oppositely arranged, the CO2Welding gun is successively on first groove side, the slope
It is swung between the centre position and second groove side of mouth；
Or, the CO2Welding gun is successively in second groove side, the centre position of the groove and first groove side
It is swung between side.
5. the vertical docking automatic soldering method of two phase stainless steel according to claim 4, which is characterized in that the CO2Welding gun exists
First groove side residence time is 0.4-0.5s, the CO2Welding gun is in first groove side residence time
For 0.4-0.5s, the CO2Welding gun is 0.1-0.2s in the centre position residence time of the groove.
6. the vertical docking automatic soldering method of two phase stainless steel according to claim 4, which is characterized in that in the step
In S20, the CO2By the way of multi-layer welding, multilayer welding is formed in the groove when to the groove welding for welding gun
The height of channel layer, each welding bead layer is respectively less than 6mm.
7. the vertical docking automatic soldering method of two phase stainless steel according to claim 6, which is characterized in that in the step
In S21, the CO2Welding gun is 70 beats/min in the hunting frequency for welding the prime coat；
And/or in the step S22, the CO2Welding gun is 40-50 beats/min in the hunting frequency for welding the filled layer；
And/or in the step S23, the CO2Welding gun is 40-50 beats/min in the hunting frequency for welding the capping layer.
8. according to the vertical docking automatic soldering method of claim 1-6 any one of them two phase stainless steels, which is characterized in that two pieces
The thickness of the two-phase stainless steel plate is 9-36mm.
9. according to the vertical docking automatic soldering method of claim 1-6 any one of them two phase stainless steels, which is characterized in that described
Liner is ceramic substrate or copper lining.
10. the vertical docking automatic soldering method of two phase stainless steel according to claim 9, which is characterized in that in the step
After S20, further includes step S30, cleaning, clear up the welding residue of the circumference of the liner and the capping layer, and by the lid
The surface of face layer polishes smooth.
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| CN109590577A (en) * | 2019-01-30 | 2019-04-09 | 焦作智造机电设备有限公司 | Jacket vertical masonry joint argonaut welding connects equipment and welding procedure |
| CN110626218A (en) * | 2019-09-26 | 2019-12-31 | 中铁第四勘察设计院集团有限公司 | Seamless contact rail system and connection method of contact rail system |
| CN111992860A (en) * | 2020-08-26 | 2020-11-27 | 广船国际有限公司 | Flux-cored wire deposited metal test method |
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| CN110626218B (en) * | 2019-09-26 | 2024-01-05 | 中铁第四勘察设计院集团有限公司 | Seamless contact rail system and connection method of contact rail system |
| CN111992860A (en) * | 2020-08-26 | 2020-11-27 | 广船国际有限公司 | Flux-cored wire deposited metal test method |
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Application publication date: 20181002 |