CN104907674A - Welding method and device of high-nitrogen austenitic stainless steel medium plate - Google Patents
Welding method and device of high-nitrogen austenitic stainless steel medium plate Download PDFInfo
- Publication number
- CN104907674A CN104907674A CN201410092256.XA CN201410092256A CN104907674A CN 104907674 A CN104907674 A CN 104907674A CN 201410092256 A CN201410092256 A CN 201410092256A CN 104907674 A CN104907674 A CN 104907674A
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- nitrogen
- welding gun
- consumable electrode
- nitrogen protection
- protection welding
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a welding method and a device of a high-nitrogen austenitic stainless steel medium plate. The method is to place a consumable electrode nitrogen protection welding gun at one side of a welding line and to place a non-consumable electrode nitrogen protection welding gun at the other side of the welding line; in welding, the consumable electrode nitrogen protection welding gun and the non-consumable electrode nitrogen protection welding gun synchronously move; nitrogen is fed at one side near the consumable electrode nitrogen protection welding gun; and the nitrogen feeding position is opposite to the moving direction of the consumable electrode nitrogen protection welding gun. The device comprises the non-consumable electrode nitrogen protection welding gun, the consumable electrode nitrogen protection welding gun and a nitrogen fixing device. The method and the device are adopted to weld the high-nitrogen austenitic stainless steel medium plate; the nitrogen content of the obtained welding line can reach 93.8% of the nitrogen content of a base metal; and the plasticity and the toughness of the welding line are close to that of the base metal.
Description
Technical field
The present invention relates to a kind of welding method and device of high-nitrogen austenitic stainless steel cut deal, belong to ferrous materials welding technology field.
Background technology
In recent years, nitrogen comes into one's own day by day as the alloying ingredients of steel, and the mechanical property of high-nitrogen austenitic stainless steel excellence, structure stability and decay resistance become the boundless Novel steel iron material of a kind of application prospect.The impact that its extensive use is welded.High nitrogen steel has good obdurability and corrosion resistance because utilizing higher nitrogen content to carry out alloying, and in its fusion process, the loss of weld metal zone nitrogen reduces the solid solution nitrogen content in weld seam, thus causes joint performance to decline.
When selecting high nitrogen steel protection-gas welding; argon gas is connected to as protection gas welding and is beneficial to striking and arc stability; but when carrying out consumable electrode argon shield weldering; the formation of nitrogen pore, the nitrogen at gas-liquid interface place are overflowed and the precipitation of nitride all can cause weld seam nitrogen loss; solid solution nitrogen content reduces, and joint performance is declined.Therefore usually select argon gas as basic composition, and by reaching the object reducing weld seam nitrogen loss to the selection of other gases and the change of ratio.Nitrogen is one of gas the most frequently used in high nitrogen steel welding process, and increase nitrogen partial pressure within the specific limits, weld seam nitrogen content also increases thereupon.
At present the welding more employing consumable electrode argon shield of high nitrogen steel is welded; as (welding [J] 2008; (12); the mist of argon gas 25-29) adopted and the carbon dioxide of 2.5% is for protect gas; although directly do not measure nitrogen content in literary composition, ferritic precipitation has illustrated the effusion having nitrogen in welding process.In the experimentation of reality, find to adopt the method, weld seam nitrogen content is about 20% of mother metal, and a large amount of losses of nitrogen make to occur ferrite in seam organization, and weld seam plasticity and toughness are reduced.
Summary of the invention
Object of the present invention has two:
(1) a kind of welding method of high-nitrogen austenitic stainless steel cut deal is provided.
(2) a kind of welder of high-nitrogen austenitic stainless steel cut deal is provided.
The technical scheme realizing the object of the invention (1) is:
A kind of welding method for high-nitrogen austenitic stainless steel cut deal; described method is that consumable electrode nitrogen protection welding gun is positioned over weld seam side; non-melt pole nitrogen protection welding gun is positioned over weld seam opposite side; during welding, consumable electrode nitrogen protection welding gun and non-melt pole nitrogen protection welding gun move simultaneously; and pass into nitrogen in the side near consumable electrode nitrogen protection welding gun, pass into nitrogen position contrary with consumable electrode nitrogen protection welding gun moving direction.
When high nitrogen steel welding, reach distinguished welding effect mainly through adopting specific protection gas.Wherein electrode gas shielded arc welding gun adopts high nitrogen steel welding wire, adopts nitrogenous gas integration number to be 5-20%, surplus be the mist of argon gas as protection gas, by regulating the content of nitrogen in protection gas, reach the control of nitrogen content in butt welded seam.Have employed non-melt pole nitrogen protection weldering bottom weld seam to weld with face of weld simultaneously, can not only ensure through welding, and can prevent nitrogen element from overflowing bottom weld seam when through welding, this pole adopts zirconium-tungsten as electric level, and nitrogen is as protection gas.
The technical scheme realizing the object of the invention (2) is:
The above-mentioned side at close consumable electrode nitrogen protection welding gun passes into nitrogen; the invention still further relates to a kind of welding fixed nitrogen device for high-nitrogen austenitic stainless steel cut deal for this reason; described device comprises high pressure nitrogen protective cover, high pressure nitrogen generating means, drags cover clamping device; described high pressure nitrogen protective cover is hexahedral shape; the narrow lower face width of end face; hollow; bottomless; front and back are symmetrical about vertical guide; residue two sides one side is perpendicular to horizontal plane; another side is inclined-plane, and end face has a passage, and passage connects high pressure nitrogen generating means by pipeline.
A kind of welder of high-nitrogen austenitic stainless steel cut deal, described device comprises consumable electrode nitrogen protection welding gun, non-melt pole nitrogen protection welding gun and fixed nitrogen device, described consumable electrode nitrogen protection welding gun is fixed on weld seam side, non-melt pole nitrogen protection welding gun is fixed on weld seam opposite side, symmetrical about high-nitrogen austenitic stainless steel cut deal with consumable electrode nitrogen protection welding gun, described high pressure nitrogen protective cover is connected with consumable electrode nitrogen protection welding gun by dragging cover clamping device, during welding, consumable electrode nitrogen protection welding gun at front high pressure nitrogen protective cover rear, high pressure nitrogen is sprayed into from high-pressure nitrogen bottle to its inside by the connection of outside wireway and its end face round vent in high pressure nitrogen protective cover, weld seam is cooled in blanket of nitrogen.
In welding process, described consumable electrode nitrogen protection welding gun and non-melt pole nitrogen protection welding gun are respectively by a manipulator or walking mechanism clamping, consumable electrode nitrogen protection welding gun is positioned over weld seam side, non-melt pole nitrogen protection welding gun is positioned over weld seam opposite side, high pressure nitrogen protective cover and consumable electrode nitrogen protection welding gun are clamped together, high pressure nitrogen protective cover bottom side alignment weld seam, its position is contrary with consumable electrode nitrogen protection welding gun moving direction, after high pressure nitrogen protective cover is positioned at consumable electrode nitrogen protection welding gun during welding, and follow its walking; During work; three partial devices move simultaneously; high pressure nitrogen is sprayed into from high-pressure nitrogen bottle to its inside by the connection of outside wireway and its end face round vent in high pressure nitrogen protective cover; weld seam is cooled in blanket of nitrogen, achieves the fixed nitrogen to the comprehensive of molten bath and overall process and protection.
Principle illustrates: in welding process, nitrogen is decomposed into nitrogen-atoms in arc space, and nitrogen-atoms also becomes nitrogen molecule in compound simultaneously, and reach the balance of compound Sum decomposition therefrom, now arc space maintains certain nitrogen activity.The nitrogen-atoms of arc space can dissolve in molten bath, and the nitrogen-atoms simultaneously in molten bath also can be overflowed, and when dissolving in and precipitation reaches balance, molten bath can maintain certain nitrogen content.Arc space nitrogen activity can be improved when improving arc space nitrogen content within the specific limits, make to dissolve in and separate out balance and move to the direction of dissolving in, thus reduce nitrogen effusion, improve molten bath nitrogen content.When electric arc moves forward, molten bath cools gradually, the protection gas now in welding gun with electric arc reach, high hot commissure nitrogen partial pressure is sharply reduced, herein by become high hot weld seam surface nitrogen-atoms be combined into molecule effusion place.For this reason, the present invention devises the welding fixed nitrogen device for high-nitrogen austenitic stainless steel cut deal, passes to high pressure nitrogen, make it cool in high nitrogen partial pressure atmosphere to high hot weld seam, thus reduces the nitrogen effusion in weld seam cooling procedure.
The present invention compared with prior art its remarkable advantage is: when utilizing device provided by the present invention to carry out the welding of high-nitrogen austenitic stainless steel cut deal, under suitable welding condition, the consumable electrode nitrogen protection welding gun in weld seam front can make the precipitation balance of dissolving in of nitrogen move to the direction of dissolving in welding process, effectively prevents the nitrogen of weld seam in arcing process from overflowing; Non-melt pole nitrogen protection welding gun bottom weld seam effectively can stop the nitrogen effusion bottom weld seam when through welding; High pressure nitrogen drags cover can effectively prevent high temperature welded seam area nitrogen from overflowing.Make final weld seam nitrogen content can reach more than 90% of mother metal, effectively reduce the effusion of weld seam nitrogen.
Accompanying drawing explanation
Fig. 1 is high-nitrogen austenitic stainless steel cut deal of the present invention welding fixed nitrogen control device structural representation.
Fig. 2 is that cover top view is dragged in the nitrogen protection of embodiment mesohigh.
Fig. 3 is A-A face cut-away view in Fig. 2.
Fig. 4 is B-B face cut-away view in Fig. 2.
Detailed description of the invention
Embodiment 1
Diameter is become to be that the cylindrical shell of 2m carries out docking longitudinal seam welding to 30mm high-nitrogen austenitic stainless steel coiled sheet plate.Adopt 55 degree of grooves, front adopts the nitrogen protection weldering of pulse melts pole, and welding wire adopts high nitrogen steel welding wire, and protection gas is the mist of the nitrogen of 9.5% and the argon gas of 90.5%, protects flow to be 20L/min during welding.Welding current is 270-290A, welds four layers.Protective cover is with the flow of 15L/min spray pure nitrogen gas simultaneously.Back of weld adopts non-melt pole nitrogen protection weldering, adopts zirconium-tungsten electrode, and its welding gun is with consumable electrode nitrogen protection welding gun synchronous walking, and adopt nitrogen as protection gas, welding current is 90A, and welding gun cover is outer with the flow of 20L/min spray nitrogen.
Concrete steps: consumable electrode nitrogen protection welding gun 1 is positioned over weld seam side, non-melt pole nitrogen protection welding gun 2 is positioned over weld seam opposite side, during welding, consumable electrode nitrogen protection welding gun 1 and non-melt pole nitrogen protection welding gun 2 move simultaneously, and connecting fixed nitrogen device near the side of consumable electrode nitrogen protection welding gun 1, fixed nitrogen device installation site is contrary with consumable electrode nitrogen protection welding gun 1 moving direction, described fixed nitrogen device comprises high pressure nitrogen protective cover 3, high pressure nitrogen generating means 4, drag cover clamping device 5, described high pressure nitrogen protective cover 3 is hexahedral shape, up-narrow and down-wide, front and back are symmetrical about vertical guide, residue two sides one side is perpendicular to horizontal plane, another side is inclined-plane, hollow, bottomless, end face has a passage, passage connects high pressure nitrogen generating means 4 by pipeline, its shape is as Fig. 2, 3, shown in 4, described high pressure nitrogen protective cover 3 is clamped together by dragging cover clamping device 5 with consumable electrode nitrogen protection welding gun 1, during welding, welding gun at front high pressure nitrogen protective cover following closely, as shown in fig. 1.At the end of welding, two welding gun blow-outs simultaneously, and continue the 50mm that moves ahead, make the high hot weld seam of blow-out place be positioned at below high pressure nitrogen protective cover, continue to pass into pure nitrogen gas in protective cover and be about 30s, stop, to protective cover ventilation, removing welding gun, terminating welding.
Postwelding has carried out nitrogen content test to mother metal and weld seam, and mother metal nitrogen content is 0.65%, and weld seam nitrogen content is 0.61%, is the successful of 93.8% of mother metal nitrogen content, the method butt welded seam fixed nitrogen.
Comparative example 1
Diameter is become to be that the cylindrical shell of 2m carries out docking longitudinal seam welding to 30mm high-nitrogen austenitic stainless steel coiled sheet plate.Adopt 55 degree of grooves, adopt high nitrogen steel welding wire, carry out the argon shield weldering of pulse melts pole, shielding gas flow amount is 20L/min, and welding current is 270-290A.
Concrete steps: change the nitrogen in consumable electrode nitrogen protection welding gun 1 and argon gas mist into pure argon, form consumable electrode argon shield welding gun, this welding gun are positioned over weld seam side.Striking is also welded, and while striking, welding gun automatically can pass into argon gas butt welded seam and protect.At the end of welding, blow-out, removes welding gun, terminates welding.
After testing, mother metal nitrogen content is 0.65%, and weld seam nitrogen content is 0.1-0.2%, is the 15.4%-30.8% of mother metal nitrogen content.
Claims (5)
1. the welding method of a high-nitrogen austenitic stainless steel cut deal; it is characterized in that: described method is that consumable electrode nitrogen protection welding gun (1) is positioned over weld seam side; non-melt pole nitrogen protection welding gun (2) is positioned over weld seam opposite side; during welding, consumable electrode nitrogen protection welding gun (1) and non-melt pole nitrogen protection welding gun (2) move simultaneously; and pass into nitrogen in the side near consumable electrode nitrogen protection welding gun (1), pass into nitrogen position contrary with consumable electrode nitrogen protection welding gun (1) moving direction.
2. welding method according to claim 1, is characterized in that: described consumable electrode nitrogen protection welding gun (1) welding wire adopts high nitrogen steel welding wire, and protection gas is the mist containing nitrogen, argon gas.
3. welding method according to claim 2, is characterized in that: protection gas is nitrogenous gas integration number is 5-20%, and surplus is the mist of argon gas.
4. welding method according to claim 1, is characterized in that: described non-melt pole nitrogen protection welding gun (2) electrode adopts zirconium-tungsten electrode, and protection gas is nitrogen.
5. the welder of a high-nitrogen austenitic stainless steel cut deal, comprise consumable electrode nitrogen protection welding gun (1) it is characterized in that: described device comprises non-melt pole nitrogen protection welding gun (2) and fixed nitrogen device, described fixed nitrogen device comprises high pressure nitrogen protective cover (3), high pressure nitrogen generating means (4), drag cover clamping device (5), described high pressure nitrogen protective cover (3) is hexahedral shape, the narrow lower face width of end face, hollow, bottomless, front and back are symmetrical about vertical guide, residue two sides one side is perpendicular to horizontal plane, another side is inclined-plane, end face has a passage, passage connects high pressure nitrogen generating means (4) by pipeline, described consumable electrode nitrogen protection welding gun (1) is fixed on weld seam side, non-melt pole nitrogen protection welding gun (2) is fixed on weld seam opposite side, symmetrical about high-nitrogen austenitic stainless steel cut deal with consumable electrode nitrogen protection welding gun (1), described high pressure nitrogen protective cover (3) is connected with consumable electrode nitrogen protection welding gun (1) by dragging cover clamping device (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410092256.XA CN104907674A (en) | 2014-03-13 | 2014-03-13 | Welding method and device of high-nitrogen austenitic stainless steel medium plate |
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| CN201410092256.XA CN104907674A (en) | 2014-03-13 | 2014-03-13 | Welding method and device of high-nitrogen austenitic stainless steel medium plate |
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| CN104907674A true CN104907674A (en) | 2015-09-16 |
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| CN201410092256.XA Pending CN104907674A (en) | 2014-03-13 | 2014-03-13 | Welding method and device of high-nitrogen austenitic stainless steel medium plate |
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Cited By (3)
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| CN106346171A (en) * | 2016-11-07 | 2017-01-25 | 苏州大学 | High-nitrogen steel pressure welding device and method for welding high-nitrogen steel by using same |
| CN110560894A (en) * | 2019-09-30 | 2019-12-13 | 长春理工大学 | High-nitrogen steel composite welding method capable of simultaneously protecting two sides by different protective gases |
| CN110560842A (en) * | 2019-08-26 | 2019-12-13 | 南京理工大学 | nitrogen fixation device and method in welding based on paraxial wire feeding |
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| CN110560894A (en) * | 2019-09-30 | 2019-12-13 | 长春理工大学 | High-nitrogen steel composite welding method capable of simultaneously protecting two sides by different protective gases |
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