CN106346171A - High-nitrogen steel pressure welding device and method for welding high-nitrogen steel by using same - Google Patents
High-nitrogen steel pressure welding device and method for welding high-nitrogen steel by using same Download PDFInfo
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- CN106346171A CN106346171A CN201610976054.0A CN201610976054A CN106346171A CN 106346171 A CN106346171 A CN 106346171A CN 201610976054 A CN201610976054 A CN 201610976054A CN 106346171 A CN106346171 A CN 106346171A
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Optics & Photonics (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a high-nitrogen steel pressure welding device and a method for welding high-nitrogen steel by using the same. The device comprises an airtight welding booth, a gas mixing chamber and a vacuum pump, wherein the airtight welding booth is respectively communicated with the gas mixing chamber and the vacuum pump through gas pipelines and is internally provided with a bracket, a welding source, a welding wire rack, a wire feeding mechanism and a welding torch; the upper side of the bracket is provided with a cooling plate; the lower side of the wire feeding mechanism is connected with a welding wire sleeve; the welding source is respectively connected with the welding wire sleeve and the bracket by virtue of electrode wires; the cooling plate is internally provided with a cold source; a welding base metal is placed on the cooling plate; raw gases are input into the airtight welding booth after being mixed in the gas mixing chamber; positions of the welding wires and the welding torch are regulated, and the welding source is turned on, so that welding is performed. By virtue of controlling the composition of system protection gases, the total system pressure and cooling parameters, the content of nitrogen in welding seams of high-nitrogen steel can be fixed, and the mechanical properties of welding seams of the high-nitrogen steel are improved; by virtue of utilizing the high-nitrogen steel pressure welding device to perform high-nitrogen steel pressure welding, the content of nitrogen in welding seams can be at least 95% of that of the base metal.
Description
Technical field
The invention belongs to Welding Metallurgy technical field is and in particular to a kind of pressurization welder being suitable for high nitrogen steel and use
The method that this device welds high nitrogen steel.
Background technology
High nitrogen steel refers to that the actual nitrogen content in steel has exceeded (0.1mpa) at ambient pressure and prepared the pole that material can reach
The steel of limit value, it is the new engineering material growing up with metallurgical technology progress in the last few years.According to nitrogen in austenite
Content in rustless steel, can by nitrogenous austenitic stainless steel be divided into control nitrogen type ([n]=0.05%～0.10%), middle nitrogen type ([n]=
0.10%～0.40%) and high nitrogen type ([n] ＞ 0.40%), as long as and the nitrogen content in ferrite and martensitic stain less steel is more than
0.08% just can be referred to as high nitrogen steel.In high nitrogen steel [n] as interstitial atom, by with other alloying elements (mn, cr, mo, v,
Nb, ti) synergism so that high-nitrogen austenitic stainless steel has excellent comprehensive mechanical property, such as high intensity, high tenacity,
High creep resistance, high wearability and good decay resistance.
Being widely used in of high nitrogen steel is heavily dependent on its welding characteristic, welds in the development and application of high nitrogen steel
The research of connection technology has more important meaning.Show that suitable Laser Welding Condition can avoid high nitrogen despite result of study
The loss of steel weld metal zone nitrogen and nitrogen pore, but its weld metal zone tissue, Performance Characteristics under Laser Welding Condition are still a weight
The problem wanted, needs to be studied further.For other welding process, weld metal zone nitrogen loss problem is still difficult to
Overcome, also need to consider the problems such as mass defects such as weld crack and nitride separate out simultaneously.At present, it is suitable for the normal of high nitrogen steel
Rule welding process is all carried out in atmospheric conditions, by increasing nitrogen ratio in welding protection gas, permissible to a certain extent
Play molten bath nitrogen fixation, but its effect inconspicuous, particularly weld seam nitrogen content is improved to mother metal nitrogen content more than 90%
Very difficult.Prior art discloses a kind of method, consumable electrode nitrogen protection welding gun is positioned over weld seam side, non-melt pole nitrogen
Gas shielded welding gun is positioned over weld seam opposite side, and during welding, consumable electrode nitrogen protection welding gun is moved with dorsal part welding gun simultaneously, and is leaning on
Nearly consumable electrode nitrogen protection welding gun side is passed through nitrogen, realizes molten bath fixed nitrogen purpose with this；The method remains in condition of normal pressure
Lower enforcement welding, and weld seam nitrogen content is low.It is thus desirable to the new device of research and development is used for high nitrogen steel welding, realize improving high nitrogen steel
The target of weld strength, makes weld seam items mechanical property maintain an equal level with mother metal.
Content of the invention
The invention provides a kind of pressurization welding method being suitable for high nitrogen steel and supporting welder, can effectively hinder
Only the nitrogen loss in welding pool in high nitrogen steel welding process is it is ensured that high nitrogen steel weld seam comprehensive mechanical property is suitable with mother metal；Can
It is applied to high nitrogen steel and the welding process of the higher metal material of other elemental gas contents, applicable tig weldering, mig weldering, Laser Welding
Etc. all types of fusion welding processes；And pressurization welding manner proposed by the present invention can be used for reference for other industry and use.
The purpose of the present invention is achieved through the following technical solutions:
A kind of high nitrogen steel pressurization device for welding, including airtight welding booth, gas mixer chamber, vacuum pump；Airtight welding booth is respectively
Connected with gas mixer chamber, vacuum pump by gas pipeline；Described airtight welding interior be provided with support, the source of welding current, welding wire frame,
Wire feeder, welding gun；It is provided with coldplate above described support；It is connected to welding wire sleeve below described wire feeder；Described welding wire set
Cylinder end is connected to welding gun；The described source of welding current is connected with welding wire sleeve, support respectively by electrode wires；Arrange in described coldplate
Low-temperature receiver.
In the present invention, connection refers to there is gas or liquid conveying between two parts, typically passes through pipeline communication, such as
Gas mixer chamber is connected with airtight welding booth, and the gas of gas mixer chamber can be delivered to airtight welding booth；Connect and there is not gas
Liquid material conveys, and mainly provides electric energy by electrode wires；Gas pipeline, waterway pipe, electrode wires connected mode unrestricted,
Can weld and can also flange connect.
In technique scheme, welding wire leaves on welding wire frame, is passed by wire feeder, to welding wire sleeve, from weldering
Silk braid cylinder protrudes into welding gun, to high nitrogen steel welding position, is subjected to；To be able to be welded by arranging dolly on support
Guide frame and wire feeder are arranged on dolly, welding wire position are regulated and controled it is also possible to be arranged linear actuator to substitute dolly in fact
Existing welding wire walks, and can also realize welding wire by track operation and walk, preferably dolly, and one is to prepare conveniently, and two is low cost, and three
It is that maintenance is easy, more mainly dolly enables multi-party Bit Shift by universal wheel, meet diverse location welding demand.
In technique scheme, coldplate is mother metal fixed-site, realizes the efficient cooling to mother metal, is critical piece,
Realize the quick cooling in weld seam molten bath, suppress escaped quantity from molten bath for the nitrogen, and then play nitrogen fixation；Can be in cooling
In plate, low-temperature receiver is set, thus playing cooling effect, circulation waterway, the setting water body turnover of side wall can be set inside coldplate
Mouthful, realize efficiently cooling down during mother metal welding by the use of water-cooled as low-temperature receiver, preferably water body import exports lower section it is ensured that cooling down in water body
It is full of cooling water in plate cavity, realize the efficient cooling to mother metal；In order to improve heat exchange effect, the preferably cooling of metal material
Plate, such as copper coin；Welding booth opens up corresponding water pipe hole simultaneously.
In technique scheme, airtight welding booth can be welded by such as 10 millimeters steel plates of steel plate, and space is concrete
Size depends on the size of welder system；On the gas pipeline that airtight welding booth is connected with gas mixer chamber and airtight welding
It is respectively provided with valve on the gas pipeline that room is connected with vacuum pump, adjusted in confined space by the difference in flow of two valves and mix
The system gross pressure of gas；Pressure detector and watch window can be set, on the one hand realize precise control pressure, on the other hand
Real Time Observation welding booth situation.
In technique scheme, gas mixer chamber is the mixing place of multipath gas, and its gas outlet is provided with flow controller,
The mixed gas of output after mixing are adjusted；In gas mixing chamber interior, gas drying block can be set it is ensured that gaseous mixture
The drying property of body, beneficial to welding effect lifting, dried pieces can realize the equal of mixed gas by absorbent cotton and the permeable granule of silica gel
Even mixing and drying.
Preferably, in the indoor setting gas blender of airtight welding, such as fan, increase all mixed degree of mixed gas.
High nitrogen steel disclosed by the invention pressurization device for welding composition rationally, during for welding high nitrogen steel, the weld seam that obtains
Middle nitrogen content is high, good mechanical property, therefore the invention also discloses above-mentioned high nitrogen steel pressurization device for welding is in welding high nitrogen steel
In application.
Such as, the present invention high nitrogen steel pressurize device for welding include one by 10 millimeters of steel plates be welded airtight
Welding booth is made in space, and the concrete size in space depends on the size of welder system；Confined space setting air inlet, venthole, pressure
Monitoring holes and observation window；Venthole is connected with vacuum pump；Air inlet connects gas flow controller by stainless-steel pipe, so
It is connected with gas mixer chamber more afterwards, the gas mixing interior laying absorbent cotton and permeable granule of silica gel, realize the uniform of mixed gas
Mix and be dried；Gas mixer chamber bottom is connected with unstrpped gas air feed bottle, such as three road gases, respectively nitrogen, argon
With carbon dioxide or oxygen；In confined space, the system gross pressure of mixed gas is adjusted manually by the difference in flow of entrance and exit
Section；Welding process is implemented in confined space, includes welding base metal, welding gun, welding wire, automatic wire feeder, welding machine electric power respectively
And equipment supporter；In welding process, welding base metal is fixed on setting circulation waterway inside one piece of water-cooled copper plate surface, copper coin, interior
Portion leads to cooling water and realizes cooling to mother metal, and water-cooled copper plate cooling water is intake from bottom, and upper port water outlet is it is ensured that in copper coin cavity
Full of cooling water, realize the efficient cooling to mother metal.
The present invention further discloses being pressurizeed the method that device for welding welds high nitrogen steel using above-mentioned high nitrogen steel, including with
Lower step:
(1) welding base metal is placed on coldplate；
(2) unstrpped gas inputs airtight welding interior after gas mixer chamber mixing；
(3) adjust welding wire and welding torch position, open the source of welding current, welded.
In technique scheme, in step (1), circulating water is set inside coldplate, and circulating water intake is in outlet
The efficient cooling to mother metal, it is ensured that being full of cooling water in coldplate cavity, is realized in lower section；Preferred cycle water turnover water temperature difference controls
Within 10 DEG C, circulating water flow is 5l/min, realizes the quick cooling in weld seam molten bath, suppresses effusion from molten bath for the nitrogen
Amount, and then play nitrogen fixation.
In technique scheme, in step (2), unstrpped gas is nitrogen, argon and oxidizing gas, and oxidizing gas are
Oxygen or carbon dioxide；In mixed gas, oxidizing gas volume fraction be 2%～5%, nitrogen volume fraction be 5～
15%, remaining is argon；It is indoor that preferred feedstock gas inputs airtight welding after gas mixer chamber mixing more after drying, it is to avoid
Contain moisture in gas and cause welding process uncontrollable, reduce impurity.In the gas composition that the present invention limits simultaneously, 2%～5%
Oxidizing gas contribute to playing the effect of surfactant, intercept nitrogen and escape from molten bath interface, greatly improve weld seam
Nitrogen content, especially realizes weld seam nitrogen content first and reaches mother metal nitrogen content more than 95%, achieves unexpected technology effect
Really.And oxidizing gas are used cooperatively with nitrogen, amount in nitrogen gas dissolved in weld seam molten bath, the opposing party are on the one hand significantly greatly increased
Face avoids impurity to produce, and prevents the decline of Weld Performance.
In technique scheme, in step (2), airtight welding gas pressure inside is 1atm～5atm, increases system total
Pressure is notable for welding pool nitrogen fixation effect；Particularly the present invention limits nitrogen partial pressure, beneficial to dissolving in molten bath for the nitrogen,
By limiting system total pressure, the balance nitrogen content in molten bath can be effectively improved, be weld seam fixed nitrogen lay a good foundation.
In technique scheme, in step (2), before input mixed gas, first use the airtight welding booth of argon purge, such as
First open vacuum pump, evacuation, by indoor for airtight welding vacuum degree control in below 0.01mpa, close vacuum pump；To airtight weldering
Connect indoor infeed high-purity argon gas, repeat this process 3 times, reach cleaning confined space, drive the purpose of air, reduce in the air its
The impact to nitrogen partial pressure for its composition, is conducive to keeping the fairness of welding process simultaneously, also avoids impurity to produce.
In technique scheme, in step (3), welding current 180～280a, speed of welding 130～220mm/min；This
The welding condition scope that invention is suitable for is wide, is suitable for traditional tig and mig welding process, beneficial to industrialization promotion.
In the present invention, it is filled with confined space by the nitrogen mixing by a certain percentage, argon and oxidizing gas (as oxygen
Gas or carbon dioxide) mixed gas that form, wherein oxygen or carbon dioxide volume fraction are 2%～5%, nitrogen volume fraction is
5～15%, remaining is argon.By controlling the valve openings degre of confined space entrance and exit, mixed gas turnover stream in system
Amount forms difference, and then changes the total system pressure in confined space, can form malleation or negative pressure in confined space, and pressure becomes
Change scope 1atm～5atm.In order to promote being uniformly distributed of mixed gas in space, spatially side increases gas stirring device,
Increase all mixed degree of mixed gas, pass through pressure gauge detecting system stagnation pressure situation of change simultaneously.Mixed gas enter confined space
Before, three road gases feed laying absorbent cotton and Silicagel dehydration agent in gas mixing tower, mixing column respectively from special gas cylinder, real
The uniform mixing of existing mixed gas and drying, export quality of connection flow controller, precise control mixed gas stream in mixing column
Amount.
The method according to the invention, such as, in welding process, welding base metal is fixed on one piece of copper coin surface, in copper coin
Portion arranges tank, and entrance enters cooling water from below, exports from top and discharges, form recirculated water cooling, cooling water passes in and out water temperature difference
Control within 10 DEG C, realize the quick cooling in weld seam molten bath, suppress escaped quantity from molten bath for the nitrogen, and then play fixed nitrogen
Effect.
The device for welding present invention firstly discloses a kind of high nitrogen steel is pressurizeed, by arranging gas mixer chamber mixed material gas
Body, realizes uniform mixing and the drying of mixed gas, exports quality of connection flow controller, precise control gaseous mixture in mixing column
Body flow, for welding protection；Realize the quick cooling in weld seam molten bath by coldplate, suppress effusion from molten bath for the nitrogen
Amount, and then play nitrogen fixation, weld seam nitrogen content can reach more than the 95% of mother metal；Achieve unexpected technique effect.
The present invention passes through to control welding protection gas composition, gross pressure and cooling parameter can reach fixing high nitrogen steel weldering
Nitrogen content in seam, improves high nitrogen steel weld joint mechanical performance.Through system test, high nitrogen steel welding is carried out using the inventive method,
Weld seam nitrogen content can reach more than the 95% of mother metal, and weld seam comprehensive mechanical property is maintained an equal level with mother metal, and application effect is notable.
High nitrogen steel pressurization device for welding composition disclosed by the invention rationally, is provided with pressure gauge, observation window, can beneficial to operation
The lifting of control property；The indoor setting support of welding is beneficial to each component placement and takes, and setting dolly walks beneficial to welding wire, arranges recirculated water
Road is substantially improved weld seam cooling effect, realizes nitrogen fixation；And carry out after high nitrogen steel welding using this device, weldquality
Good, nitrogen content is high, and mechanical performance is excellent.
Brief description
Fig. 1 is the structural representation of embodiment one high nitrogen steel pressurization device for welding；
Wherein: airtight welding booth 1, gas mixer chamber 2, vacuum pump 3, valve 4, valve 5, support 6, the source of welding current 7, welding wire frame 8,
Wire feeder 9, dolly 10, coldplate 11, welding wire sleeve 12, welding gun 13, electrode wires 14, water body import 15, water body outlet 16, gas
Body agitator 17, pressure detector 18, gas drying block 19, flow controller 20, welding wire 21, mother metal 22.
Specific embodiment
The present invention, by mixed gas protected, dramatically increases the dissolving nitrogen content in welding fluid molten bath, compacting welding high nitrogen steel
Basis, realize the combination of pressurization metallurgical technology and welding procedure, thus improving the target of high nitrogen steel weld strength；Using
The inventive method implements high nitrogen steel welding, and weld seam nitrogen content can reach more than the 95% of mother metal, and every mechanical property and mother metal are held
Flat, achieve unexpected technique effect.
Embodiment one
Referring to accompanying drawing 1, a kind of high nitrogen steel pressurization device for welding, including airtight welding booth 1, gas mixer chamber 2, vacuum pump 3；Close
Close welding booth to connect with gas mixer chamber, vacuum pump by gas pipeline respectively, airtight welding booth is connected with gas mixer chamber
Valve 4,5 is respectively provided with the gas pipeline that on gas pipeline and airtight welding booth is connected with vacuum pump；Airtight welding is indoor
It is provided with support 6, the source of welding current 7, welding wire frame 8, wire feeder 9；Dolly 10 is arranged on support；Welding wire frame and wire feeder are arranged on
On dolly；It is provided with coldplate 11 above support；It is connected to welding wire sleeve 12 below wire feeder；Welding wire sleeve ends are connected to welding gun
13；The source of welding current is connected with welding wire sleeve, support respectively by electrode wires 14；Coldplate is water-cooled copper plate, internal setting circulation
Water route is low-temperature receiver, and wall setting water body in side is imported and exported, and water body import 15 is below water body outlet 16；Airtight welding booth is provided with gas and stirs
Mix device 17, be fan, pressure detector 18, be pressure gauge；Gas mixing interior is provided with gas drying block 19, by absorbent cotton and silicon
The permeable granule of glue forms, and realizes uniform mixing and the drying of mixed gas；Gas mixer chamber outlet is provided with flow controller 20, arrow
Head represents that three road gases enter gas mixer chamber；During use, welding wire 21 is extracted out from welding wire frame, enters welding wire set through wire feeder
Cylinder, then emerge from welding gun, welding is placed on the mother metal 22 on water-cooled copper plate.
Embodiment two
A kind of high nitrogen steel pressurization device for welding, including airtight welding booth, gas mixer chamber, vacuum pump；Airtight welding booth is respectively
Connected with gas mixer chamber, vacuum pump by gas pipeline, on the gas pipeline that airtight welding booth is connected with gas mixer chamber with
And it is respectively provided with valve on the gas pipeline that connects with vacuum pump of airtight welding booth；Airtight welding interior is provided with support, welding electricity
Source, welding wire frame, wire feeder；Dolly is arranged on support；Welding wire frame and wire feeder are arranged on dolly；It is provided with cold above support
But plate；It is connected to welding wire sleeve below wire feeder；Welding wire sleeve ends are connected to welding gun；The source of welding current pass through electrode wires respectively with weldering
Silk braid cylinder, support connect；Coldplate is water-cooled copper plate, and internal setting circulation waterway is low-temperature receiver, and wall setting water body in side is imported and exported, and enters
Mouth is below water body outlet；Airtight welding booth is provided with gas blender, pressure detector, watch window；Gas mixing interior sets
There is gas drying block, be made up of absorbent cotton and the permeable granule of silica gel, realize uniform mixing and the drying of mixed gas；Gas mixing
Room outlet is provided with flow controller.
Embodiment three
A kind of high nitrogen steel pressurization device for welding, including airtight welding booth, gas mixer chamber, vacuum pump；Airtight welding booth is respectively
Connected with gas mixer chamber, vacuum pump by gas pipeline, on the gas pipeline that airtight welding booth is connected with gas mixer chamber with
And it is respectively provided with valve on the gas pipeline that connects with vacuum pump of airtight welding booth；Airtight welding interior is provided with support, welding electricity
Source, welding wire frame, wire feeder；Dolly is arranged on support；Welding wire frame and wire feeder are arranged on dolly；It is provided with cold above support
But plate；It is connected to welding wire sleeve below wire feeder；Welding wire sleeve ends are connected to welding gun；The source of welding current pass through electrode wires respectively with weldering
Silk braid cylinder, support connect；Coldplate is hollow copper coin, and internal setting dry ice lumps are low-temperature receiver；Airtight welding booth is provided with Gas Stirring
Device, pressure detector, watch window；Gas mixing interior is provided with gas drying block, is made up of absorbent cotton and the permeable granule of silica gel,
Realize uniform mixing and the drying of mixed gas；Gas mixer chamber outlet is provided with flow controller.
High nitrogen steel sheet material to be welded is fixed on the coldplate plate surface of confined space, welding gun welding wire prepares to put in place；Open
Vacuum pump, evacuation, by indoor for airtight welding vacuum degree control in below 0.01mpa, close vacuum pump；Feed high-purity argon gas,
Repeat this process 3 times, reach cleaning confined space, drive the purpose of air.Later on inlet valve, mixed gas (argon+
Nitrogen+oxygen/carbon dioxide) after eliminating water is dried, confined space is fed with particular flow rate.By controlling confined space entrance
With outlet valve opening degree, make to keep certain system pressure (1atm～5atm) in confined space.After system pressure is stable,
Start high nitrogen steel welding, dolly carries universal wheel, can Bit Shift in many ways, welding process completes under automatic control.
Example IV
Using the device of embodiment one, butt welding is implemented to 20mm thickness high-nitrogen austenitic stainless steel 1cr22mn16n flat board, opens
35 degree of grooves, protect weldering using pulse melts pole, and hybrid protection gas consists of 2%o2+10%n2+ 88%ar, gas flow 25l/
Min, confined space total system pressure 2.5atm；Welding current 250～270a, welds six layers, and speed of welding 180mm/min is followed
Ring water turnover water temperature difference controls within 10 DEG C, water-cooled copper plate cooling water flow 5l/min.
Postwelding is detected using onh analyser to the nitrogen content of mother metal and weld metal, and mother metal nitrogen content is 0.70%,
Weld seam nitrogen content 0.655%, is mother metal nitrogen content 93.6%, significantly improves weld seam nitrogen content, and weld strength coefficient reaches 88%.
Embodiment five
Using the device of embodiment two, butt welding is implemented to 20mm thickness high-nitrogen austenitic stainless steel 1cr22mn16n flat board, opens
35 degree of grooves, protect weldering using pulse melts pole, and hybrid protection gas consists of 5%co2+10%n2+ 85%ar, gas flow 25l/
Min, confined space total system pressure 2atm；Welding current 250～270a, welds six layers, speed of welding 180mm/min, circulation
Water turnover water temperature difference controls within 10 DEG C, water-cooled copper plate cooling water flow 5l/min.
Postwelding is detected using onh analyser to the nitrogen content of mother metal and weld metal, and mother metal nitrogen content is 0.70%,
Weld seam nitrogen content 0.671%, is mother metal nitrogen content 95.8%, significantly improves weld seam nitrogen content.Strength of parent is 1100mpa, inspection
Survey weld strength is 980mpa, and weld strength coefficient reaches 89%.
Embodiment six
Using the device of embodiment two, butt welding is implemented to 20mm thickness high-nitrogen austenitic stainless steel 1cr22mn16n flat board, opens
35 degree of grooves, protect weldering using pulse melts pole, and hybrid protection gas consists of 2%o2+5%n2+ 93%ar, gas flow 25l/
Min, confined space total system pressure 3atm；Welding current 180～200a, speed of welding 155mm/min, recirculated water passes in and out water temperature
Difference controls within 10 DEG C, water-cooled copper plate cooling water flow 5l/min.
Postwelding is detected using onh analyser to the nitrogen content of mother metal and weld metal, and mother metal nitrogen content is 0.70%,
Weld seam nitrogen content 0.635%, is mother metal nitrogen content 90.7%, significantly improves weld seam nitrogen content, weld strength coefficient reach 85% with
On.
Embodiment seven
Using the device of embodiment two, butt welding is implemented to 20mm thickness high-nitrogen austenitic stainless steel 1cr22mn16n flat board, opens
35 degree of grooves, protect weldering using pulse melts pole, and hybrid protection gas consists of 5%co2+15%n2+ 80%ar, gas flow 25l/
Min, confined space total system pressure 4atm；Welding current 250～270a, welds six layers, speed of welding 170mm/min, circulation
Water turnover water temperature difference controls within 10 DEG C, water-cooled copper plate cooling water flow 5l/min.
Postwelding is detected using onh analyser to the nitrogen content of mother metal and weld metal, and mother metal nitrogen content is 0.70%,
Weld seam nitrogen content 0.673%, is mother metal nitrogen content 96.1%, significantly improves weld seam nitrogen content, and weld strength coefficient reaches 89%.
Embodiment eight
Using the device of embodiment two, butt welding is implemented to 20mm thickness high-nitrogen austenitic stainless steel 1cr22mn16n flat board, opens
35 degree of grooves, protect weldering using pulse melts pole, and hybrid protection gas consists of 3%o2+8%n2+ 89%ar, gas flow 25l/
Min, confined space total system pressure 1.2atm；Welding current 180～200a, speed of welding 165mm/min, recirculated water Inlet and outlet water
The temperature difference controls within 10 DEG C, water-cooled copper plate cooling water flow 5l/min.
Postwelding is detected using onh analyser to the nitrogen content of mother metal and weld metal, and mother metal nitrogen content is 0.70%,
Weld seam nitrogen content 0.640%, is mother metal nitrogen content 91.4%, significantly improves weld seam nitrogen content, weld strength coefficient reach 86% with
On.
Comparative example one
Carry out reel using the device of embodiment two to 8mm thickness high-nitrogen austenitic stainless steel gap is welded, using pulse melts
Pole protection weldering, hybrid protection gas consists of 10n2+ 90%ar, gas flow 20l/min, confined space total system pressure
2.5atm；Welding current 180～200a, speed of welding 155mm/min；Recirculated water turnover water temperature difference controls within 10 DEG C, water
Cold copper coin cooling water flow 5l/min.
Postwelding is detected using onh analyser to the nitrogen content of mother metal and weld metal, and mother metal nitrogen content is 0.70%,
Weld seam nitrogen content 0.574%, is mother metal nitrogen content 82%, and weld strength coefficient reaches 78%.In contrast, example can be seen that shielding gas
Be conducive to increasing the nitrogen loss of suppression welding pool using the oxidizing gas of the present invention in body.
Claims (10)
1. a kind of high nitrogen steel pressurization device for welding it is characterised in that: described high nitrogen steel pressurization device for welding includes airtight weldering
Connect room, gas mixer chamber, vacuum pump；Airtight welding booth is connected with gas mixer chamber, vacuum pump by gas pipeline respectively；Described
Airtight welding interior is provided with support, the source of welding current, welding wire frame, wire feeder, welding gun；It is provided with coldplate above described support；Institute
State and below wire feeder, be connected to welding wire sleeve；Described welding wire sleeve ends are provided with welding gun；The described source of welding current is divided by electrode wires
It is not connected with welding wire sleeve, support；Low-temperature receiver is set in described coldplate.
2. according to claim 1 high nitrogen steel pressurization device for welding it is characterised in that: on described support arrange dolly；Weldering
Guide frame and wire feeder are arranged on dolly；Setting circulation waterway inside described coldplate, wall setting water body in side is imported and exported.
3. according to claim 1 high nitrogen steel pressurization device for welding it is characterised in that: described airtight welding booth and gas mix
It is respectively provided with valve on the gas pipeline that on the gas pipeline of conjunction room connection and airtight welding booth is connected with vacuum pump；Described close
Close welding booth and be provided with gas blender, pressure detector, watch window.
4. according to claim 1 high nitrogen steel pressurization device for welding it is characterised in that: described gas mixing interior is provided with gas
Body dried pieces；Described gas mixer chamber outlet is provided with flow controller.
5. application in welding high nitrogen steel for the high nitrogen steel pressurization device for welding described in claim 1.
6. using described in claim 1 high nitrogen steel pressurize device for welding weld high nitrogen steel method it is characterised in that include with
Lower step:
(1) welding base metal is placed on coldplate；
(2) unstrpped gas inputs airtight welding interior after gas mixer chamber mixing；
(3) adjust welding wire and welding torch position, open the source of welding current, welded.
7. according to claim 6 welding high nitrogen steel method it is characterised in that: in step (1), inside coldplate arrange
Circulating water, circulating water intake is below outlet.
8. according to claim 6 welding high nitrogen steel method it is characterised in that: in step (2), unstrpped gas be nitrogen,
Argon and oxidizing gas；Described oxidizing gas are oxygen or carbon dioxide；In mixed gas, oxidizing gas body
Fraction is 2%～5%, and nitrogen volume fraction is 5～15%, and remaining is argon；Unstrpped gas warp again after gas mixer chamber mixing
Airtight welding is inputted indoor after drying.
9. according to claim 6 welding high nitrogen steel method it is characterised in that: in step (2), airtight welding indoor gas
Pressure is 1atm～5atm；Before input mixed gas, first use the airtight welding booth of argon purge.
10. according to claim 6 welding high nitrogen steel method it is characterised in that: in step (3), welding current 180～
280a, speed of welding 150～180mm/min.
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