CN110026666A - A kind of plasma arc welding (PAW) silk filling method for the welding of thin plate 9Ni steel - Google Patents
A kind of plasma arc welding (PAW) silk filling method for the welding of thin plate 9Ni steel Download PDFInfo
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- CN110026666A CN110026666A CN201910401489.6A CN201910401489A CN110026666A CN 110026666 A CN110026666 A CN 110026666A CN 201910401489 A CN201910401489 A CN 201910401489A CN 110026666 A CN110026666 A CN 110026666A
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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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Abstract
The present invention discloses a kind of plasma arc welding (PAW) silk filling 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) filler wire 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) filler wire welding technique 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 (PAW) silk filling technique 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 (PAW) silk filling technique of thin plate 9Ni steel, and the welding joint mechanical property after welding is good, especially low-temperature impact
Toughness is good.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of plasma arc welding (PAW) silk filling method for the welding of thin plate 9Ni steel, comprising the following steps:
1) prepare before welding: since plate thickness is relatively thin, and Plasma Welding is without filling, therefore 9Ni thin plate finished edge type to be welded
For 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 thin plate 9Ni to be welded is with a thickness of 6mm.
Further, use argon tungsten-arc welding spot welding by two sections of fixations of 9Ni thin plate to be welded 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 filler wire welding: using plasma arc welding (PAW) silk filling technique, 9Ni steel plate being integrally put into soldering test machine
And it is fixed, the steel plate back side is back protection liner.It is passed through the argon gas protection of purity 99.99%.Wire feed rifle is as close as possible to plasma gun
Mouthful, it is practical because Equipment spacing is 2cm.Wire feed rate is 1000 ~ 1200mm/min.Plasma-arc center is along weldering when welding
Seam center, welding current are 180 ~ 200A, and weldingvoltage is 23 ~ 27V, and speed of welding is 21 ~ 23cm/min, plasma gas flow rate
For 5L/min；Back of weld protection argon flow is 25L/min in welding process；
Further, welding wire used is capital thunder wlding φ 1.2mmGMN-CM3 welding wire.
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 room temperature
Welding plate is taken out again afterwards.
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) filler wire welding technique blank, and retaining wall on slope is relatively easy, and ess-strain is small,
Molding is good and welding efficiency is high, the good mechanical properties of welding point.The present invention replaces stainless steel production land vehicle-mounted by 9Ni
LNG 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；In welding process back of weld protection argon flow be 25L/min, wire feed rifle wire feed rate be 1000 ~
When 1200mm/min, 720 ~ 730MPa of welding point tensile strength.At -196 DEG C, weld metal impact value is 15 ~ 21J；Fusion
Line impact value is 12 ~ 15J；Heat affected area impact value is 21 ~ 27J.According to the specification of taken impact specimen, the practical punching of welding point
Hit value, at -196 DEG C, weld metal is 45 ~ 63J；Melt run is 36 ~ 45J；Heat affected area impact value is 63 ~ 81J.Therefore, it adopts
The thin plate 9Ni steel welded with the technique, has good mechanical property, and -196 DEG C of low-temperature impacts are rushed substantially close to base material
It hits, low-temperature impact toughness is excellent.
Specific embodiment
Embodiment 1
A kind of plasma arc welding (PAW) silk filling technique suitable for thin plate 9Ni steel, is processed as type I groove for thin plate 9Ni to be welded, by 9Ni
Thin plate is integrally put into soldering test machine, fixes 9Ni thin plate, steel plate back by fixed test plate (panel) longitudinal joint tooling, compression executing agency
Face 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) fills silk technological parameter: plasma-arc center is along Weld pipe mill when welding, welding current 180A,
Weldingvoltage is 23V, speed of welding 21cm/min, plasma gas flow rate 5L/min, and back of weld is protected in welding process
Argon flow is 25L/min, and wire feed rifle is away from plasma gun 2cm, wire feed rate 1000mm/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: filling silk what technique was welded using the plasma arc welding (PAW)
9Ni 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 welding (PAW) silk filling technique suitable for thin plate 9Ni steel, is processed as type I groove for thin plate 9Ni to be welded, by 9Ni
Thin plate is integrally put into soldering test machine, fixes 9Ni thin plate, steel plate back by fixed test plate (panel) longitudinal joint tooling, compression executing agency
Face 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) fills silk technological parameter: plasma-arc center is along Weld pipe mill when welding, welding current 200A,
Weldingvoltage is 27V, speed of welding 23cm/min, plasma gas flow rate 5L/min；Back of weld is protected in welding process
Argon flow is 25L/min.Wire feed rifle is away from plasma gun 2cm, wire feed rate 1200mm/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 63J, melt run real impact toughness average value 45J,
Welding heat affected zone real impact toughness average value 81J.Test result shows: the 9Ni welded using the Plasma Welding technique
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 (6)
- A kind of method 1. plasma arc welding (PAW) for the welding of thin plate 9Ni steel fills silk, 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) filler wire welding is carried out at room temperature, and 9Ni thin plate is integrally put into soldering test machine and is consolidated Fixed, the steel plate back side is back protection liner；It is passed through the argon gas protection of purity 99.99%；Wire feed rifle as close as possible to plasma welding muzzle, Wire feed rate is 1000 ~ 1200mm/min；Along Weld pipe mill, welding current is 180 ~ 200A at plasma-arc center when welding, Weldingvoltage is 23 ~ 27V, and speed of welding is 21 ~ 23cm/min, plasma gas flow rate 5L/min；Weld seam is carried on the back in welding process It is 25L/min that argon flow is protected in face；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. as described in claim 1 for the plasma arc welding (PAW) silk filling method of thin plate 9Ni steel welding, it is characterised in that the 9Ni Lamella thickness is 6mm.
- 3. as described in claim 1 for the plasma arc welding (PAW) silk filling method of thin plate 9Ni steel welding, it is characterised in that welding wire used For capital thunder wlding φ 1.2mmGMN-CM3 welding wire.
- 4. as described in claim 1 for the plasma arc welding (PAW) silk filling method of thin plate 9Ni steel welding, it is characterised in that welding point 720 ~ 730MPa of tensile strength；- 196 DEG C of impact values: weld metal is 45 ~ 63J；Melt run is 36 ~ 45J；Heat affected area impact Value is 63 ~ 81J.
- 5. as described in claim 1 for the plasma arc welding (PAW) silk filling method of thin plate 9Ni steel welding, it is characterised in that finished edge 9Ni thin plate to be welded is fixed using argon tungsten-arc welding spot welding after the completion.
- 6. as described in claim 1 for thin plate 9Ni steel welding plasma arc welding (PAW) fill silk method, it is characterised in that wire feed rifle with Plasma welding muzzle spacing is 2cm.
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| CN201910401489.6A CN110026666A (en) | 2019-05-15 | 2019-05-15 | A kind of plasma arc welding (PAW) silk filling method for the welding of thin plate 9Ni steel |
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| CN201910401489.6A CN110026666A (en) | 2019-05-15 | 2019-05-15 | A kind of plasma arc welding (PAW) silk filling method for the welding of thin plate 9Ni steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112809135A (en) * | 2021-01-15 | 2021-05-18 | 广东福维德焊接股份有限公司 | Automatic efficient deep-melting argon arc welding process for 9Ni steel |
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- 2019-05-15 CN CN201910401489.6A patent/CN110026666A/en active Pending
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| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112809135A (en) * | 2021-01-15 | 2021-05-18 | 广东福维德焊接股份有限公司 | Automatic efficient deep-melting argon arc welding process for 9Ni steel |
| CN112809135B (en) * | 2021-01-15 | 2021-09-14 | 广东福维德焊接股份有限公司 | Automatic efficient deep-melting argon arc welding process for 9Ni steel |
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