CN110026667A - A kind of plasma arc soldering method for the welding of thin plate 9Ni steel - Google Patents
A kind of plasma arc soldering method for the welding of thin plate 9Ni steel Download PDFInfo
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- CN110026667A CN110026667A CN201910404393.5A CN201910404393A CN110026667A CN 110026667 A CN110026667 A CN 110026667A CN 201910404393 A CN201910404393 A CN 201910404393A CN 110026667 A CN110026667 A CN 110026667A
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- welding
- thin plate
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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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
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- Engineering & Computer Science (AREA)
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The present invention discloses a kind of plasma arc soldering method for the welding of thin plate 9Ni steel, it is characterised in that the following steps are included: 1) welding preparation: 9Ni thin plate finished edge, and type is I type；2) without preheating, PLASMA ARC WELDING is carried out at room temperature；3) after the completion of welding, continue to be passed through argon gas in back of weld, again take out welding plate after being cooled to room temperature.The present invention has filled up 9Ni steel plasma arc welding (PAW) welding procedure blank, and retaining wall on slope is relatively easy, and ess-strain is small, and molding is good and welding efficiency is high, the good mechanical properties of welding point.
Description
Technical field
The present invention relates to welding technology fields, and in particular to a kind of plasma arc Welding of thin plate 9Ni steel.
Background technique
Liquefied natural gas (LNG) is as a kind of cleaning, the efficient energy, attention of the industry development by every country.
Land vehicle-mounted storage tank is mainly made by stainless steel at this stage, in contrast, 9Ni steel cost is lower, even if welding material used
Expect that price is slightly higher, integrating finally can also achieve the purpose that drop originally.But stainless steel is largely used when making land mobile tank
Ion arc-welding, and 9Ni steel differs greatly with stainless steel, can not directly utilize the plasma arc Welding of stainless steel maturation.Existing rank
Section is also almost without can 9Ni steel plasma arc Welding for reference.
Summary of the invention
In order to which the purpose of 9Ni steel originally instead of stainless steel production land tank drop is better achieved, the present invention proposes a kind of be applicable in
In the plasma arc Welding of thin plate 9Ni steel, and the welding joint mechanical property after welding is good, especially low-temperature impact toughness
Well.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of plasma arc soldering method for the welding of thin plate 9Ni steel, it is characterised in that the following steps are included:
1) prepare before welding: since plate thickness is relatively thin, and Plasma Welding is without filling, therefore 9Ni thin plate finished edge type is I
Type.In advance can concordantly be polished retaining wall on slope clean, the spots such as removal groove two sides water, oil afterwards.
Further, the 9Ni lamella thickness is 6mm.
Further, the 9Ni thin plate tensile strength is 732MPa, and -196 DEG C of average impact function are 70J.
Further, use argon tungsten-arc welding spot welding by the two sections of fixations of 9Ni thin plate after the completion of finished edge.
2) it preheats: can carry out at room temperature, without preheating；
3) because of the difference of 9Ni steel and stainless composition of steel, manufacturing process is different greatly, can not directly apply stainless steel Plasma Welding
Technological parameter carries out plasma arc welding (PAW) to 9Ni steel, otherwise will lead to 9Ni steel welding fabrication difficulty or does not form.By being directed to 9Ni
Steel carries out repeatedly test weld, continues to optimize parameter and subsequent welding joint mechanical property test result, finally, using following welding window
Mouth carries out 9Ni steel Plasma Welding: using PLASMA ARC WELDING, 9Ni thin plate is integrally put into soldering test machine and fixation, steel plate
The back side is back protection liner.It is passed through the argon gas protection of purity 99.99%.Plasma-arc center is along Weld pipe mill, welding when welding
Electric current is 180 ~ 200A, and weldingvoltage is 23 ~ 27V, and speed of welding is 21 ~ 23cm/min, plasma gas flow rate 5L/min；Weldering
Back of weld protection argon flow is 25L/min in termination process；
4) after the completion of welding, continue to be passed through argon gas in back of weld, and still fixed with soldering test machine.It is cooled to after room temperature again
Welding plate is taken out.
5) test plate (panel) is sampled after the completion of welding and carries out Mechanics Performance Testing.
By adopting the above-described technical solution, the present invention has following good effect:
The present invention has filled up 9Ni steel plasma arc welding (PAW) welding procedure blank, and retaining wall on slope is relatively easy, and ess-strain is small, molding
Good and welding efficiency is high, the good mechanical properties of welding point.The present invention replaces stainless steel to produce the vehicle-mounted LNG in land by 9Ni
Storage tank provides the support of plasma arc welding (PAW) technology.
Welding point is formed by the present invention and carries out Mechanics Performance Testing, wherein impact specimen takes 3.3*10*55 specification
Sample.When welding current is 180 ~ 200A, weldingvoltage is 23 ~ 27V, and speed of welding is 21 ~ 23cm/min, plasma air-flow
Amount is 5L/min；When back of weld protection argon flow is 25L/min in welding process, welding point tensile strength 730 ~
740MPa.At -196 DEG C, weld metal impact value is 15 ~ 21J；Melt run impact value is 12 ~ 18J；Heat affected area impact value is
21~27J.According to the specification of taken impact specimen, welding point real impact value, at -196 DEG C, weld metal is 45 ~ 63J；It is molten
Zygonema is 36 ~ 54J；Heat affected area impact value is 63 ~ 81J.Therefore, the thin plate 9Ni steel welded using the technique is had good
Mechanical property, substantially close to the impact of base material, low-temperature impact toughness is excellent for -196 DEG C of low-temperature impacts.
Specific embodiment
Embodiment 1
A kind of plasma arc soldering method for the welding of thin plate 9Ni steel, is processed as type I groove for thin plate 9Ni to be welded first, will
9Ni thin plate is integrally put into soldering test machine, fixes 9Ni thin plate, steel plate by fixed test plate (panel) longitudinal joint tooling, compression executing agency
The back side is back protection liner.Without preheating.
Test piece for welding is the 9Ni steel of 6mm thickness.The chemical constituent of 9Ni steel is: C 0.04wt%, Si 0.23wt%, Mn are
0.65wt%, Ni 9.06wt%, the mechanical property of the 9Ni steel is: tensile strength 732MPa, yield strength 696MPa,
Elongation percentage A=20%；Impact energy Ak v=70J at -196 DEG C.
Plasma arc welding (PAW) technological parameter: plasma-arc center is along Weld pipe mill, welding current 180A, welding when welding
Voltage is 23V, speed of welding 21cm/min, plasma gas flow rate 5L/min；Back of weld protects argon gas in welding process
Flow is 25L/min.
After the completion of welding, continue to be passed through argon gas in back of weld, and still fixed with soldering test machine.After being cooled to room temperature
Welding plate is taken out again, the weld properties of postwelding are tested and analyzed, as a result as follows: welding point tensile strength is
730MPa, -196 DEG C of weld metals real impact toughness average value be 45J, melt run real impact toughness average value 36J,
Welding heat affected zone real impact toughness average value 63J.Test result shows: the 9Ni welded using the plasma arc Welding
Steel has good mechanical property, and substantially close to the impact of base material, low-temperature impact toughness is excellent for -196 DEG C of low-temperature impacts.
Embodiment 2
A kind of plasma arc soldering method for the welding of thin plate 9Ni steel, is processed as type I groove for thin plate 9Ni to be welded first, will
9Ni thin plate is integrally put into soldering test machine, fixes 9Ni thin plate, steel plate by fixed test plate (panel) longitudinal joint tooling, compression executing agency
The back side is back protection liner.Without preheating.
Test piece for welding is the 9Ni steel of 6mm thickness.The chemical constituent of 9Ni steel is: C 0.04wt%, Si 0.23wt%, Mn are
0.65wt%, Ni 9.06wt%, the mechanical property of the 9Ni steel is: tensile strength 732MPa, yield strength 696MPa,
Elongation percentage A=20%；Impact energy Ak v=70J at -196 DEG C.
Plasma arc welding (PAW) technological parameter: plasma-arc center is along Weld pipe mill, welding current 200A, welding when welding
Voltage is 27V, speed of welding 23cm/min, plasma gas flow rate 5L/min；Back of weld protects argon gas in welding process
Flow is 25L/min.
After the completion of welding, continue to be passed through argon gas in back of weld, and still fixed with soldering test machine.After being cooled to room temperature
Welding plate is taken out again, the weld properties of postwelding are tested and analyzed, as a result as follows: welding point tensile strength is
740MPa, -196 DEG C of weld metals real impact toughness average value be 63J, melt run real impact toughness average value 54J,
Welding heat affected zone real impact toughness average value 81J.Test result shows: the 9Ni welded using the plasma arc Welding
Steel has good mechanical property, and substantially close to the impact of base material, low-temperature impact toughness is excellent for -196 DEG C of low-temperature impacts.
In addition to the implementation, the present invention is there are also other embodiment, all to be formed using equivalent substitution or equivalent transformation
Technical solution is all fallen within the scope of the present invention.
Claims (4)
1. a kind of plasma arc soldering method for the welding of thin plate 9Ni steel, it is characterised in that the following steps are included:
1) welding preparation: 9Ni thin plate finished edge, type are I type；
2) without preheating, plasma arc welding (PAW) welding is carried out at room temperature, 9Ni thin plate is integrally put into soldering test machine and fixation,
The steel plate back side is back protection liner；It is passed through the argon gas protection of purity 99.99%；Plasma-arc center is along Weld pipe mill when welding,
Welding current is 180 ~ 200A, and weldingvoltage is 23 ~ 27V, and speed of welding is 21 ~ 23cm/min, plasma gas flow rate 5L/
min；Back of weld protection argon flow is 25L/min in welding process；
3) after the completion of welding, continue to be passed through argon gas in back of weld, again take out welding plate after being cooled to room temperature.
2. the plasma arc soldering method for the welding of thin plate 9Ni steel as described in claim 1, it is characterised in that the 9Ni thin plate
With a thickness of 6mm, tensile strength 732MPa, -196 DEG C of average impact function are 70J.
3. the plasma arc soldering method for the welding of thin plate 9Ni steel as claimed in claim 1 or 2, it is characterised in that welding point
730 ~ 740MPa of tensile strength；- 196 DEG C of impact values: weld metal is 45 ~ 63J, and melt run is 36 ~ 54J, heat affected area impact
Value is 63 ~ 81J.
4. the plasma arc soldering method for the welding of thin plate 9Ni steel as described in claim 1, it is characterised in that finished edge is completed
9Ni thin plate to be welded is fixed using argon tungsten-arc welding spot welding afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910404393.5A CN110026667A (en) | 2019-05-15 | 2019-05-15 | A kind of plasma arc soldering method for the welding of thin plate 9Ni steel |
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| CN201910404393.5A CN110026667A (en) | 2019-05-15 | 2019-05-15 | A kind of plasma arc soldering method for the welding of thin plate 9Ni steel |
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Citations (6)
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|---|---|---|---|---|
| US20080057341A1 (en) * | 2006-09-06 | 2008-03-06 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes George | Wire, flux and process for welding steel having a high nickel content |
| CN101808774A (en) * | 2007-10-05 | 2010-08-18 | 株式会社神户制钢所 | Welding solid wire |
| CN103260817A (en) * | 2010-12-22 | 2013-08-21 | 株式会社神户制钢所 | Welding solid wire and welding metal |
| CN103476538A (en) * | 2011-04-06 | 2013-12-25 | 乔治洛德方法研究和开发液化空气有限公司 | Flux-cored wire for welding steel having a high nickel content |
| CN106574339A (en) * | 2014-07-31 | 2017-04-19 | 杰富意钢铁株式会社 | Ferritic stainless steel sheet for plasma welding and welding method therefor |
| CN109531057A (en) * | 2018-11-12 | 2019-03-29 | 常州旷达威德机械有限公司 | A kind of processing method of 9Ni steel end socket |
-
2019
- 2019-05-15 CN CN201910404393.5A patent/CN110026667A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080057341A1 (en) * | 2006-09-06 | 2008-03-06 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes George | Wire, flux and process for welding steel having a high nickel content |
| CN101808774A (en) * | 2007-10-05 | 2010-08-18 | 株式会社神户制钢所 | Welding solid wire |
| CN103260817A (en) * | 2010-12-22 | 2013-08-21 | 株式会社神户制钢所 | Welding solid wire and welding metal |
| CN103476538A (en) * | 2011-04-06 | 2013-12-25 | 乔治洛德方法研究和开发液化空气有限公司 | Flux-cored wire for welding steel having a high nickel content |
| CN106574339A (en) * | 2014-07-31 | 2017-04-19 | 杰富意钢铁株式会社 | Ferritic stainless steel sheet for plasma welding and welding method therefor |
| CN109531057A (en) * | 2018-11-12 | 2019-03-29 | 常州旷达威德机械有限公司 | A kind of processing method of 9Ni steel end socket |
Non-Patent Citations (2)
| Title |
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| 张应立: "《锅炉压力容器焊工基本技能》", 30 April 2014, 金盾出版社 * |
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