CN108500429A - A kind of welding method of composite bimetal pipe - Google Patents
A kind of welding method of composite bimetal pipe Download PDFInfo
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- CN108500429A CN108500429A CN201810587971.9A CN201810587971A CN108500429A CN 108500429 A CN108500429 A CN 108500429A CN 201810587971 A CN201810587971 A CN 201810587971A CN 108500429 A CN108500429 A CN 108500429A
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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
- B23K9/235—Preliminary treatment
-
- 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
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- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention belongs to welding engineering fields, more particularly to a kind of welding method of composite bimetal pipe, this method is directed to composite bimetal pipe, welding including mechanical composite tube and metallurgical composite pipe, provide a kind of welding surface progress retaining wall on slope processing to composite bimetal pipe base, groove type is single V groove with root face, then it is welded in such a way that TIG or MIG carries out pre- soldering and sealing processing, whole welding is completed in such a way that more welding beads are superimposed, the above method can solve the problems such as composite bimetal pipe one side weld welding cost is high, joint quality is low and weld seam is anti-corrosion poor.
Description
Technical field
The invention belongs to welding engineering fields, and in particular to a kind of welding method of composite bimetal pipe.
Background technology
Composite bimetal pipe is combined by specific processing technology with liner layer by base and is formed, and it is compound to be broadly divided into machinery
Pipe and metallurgical composite pipe.Base is carbon steel or low alloy steel, is responsible for the effect of pressure-bearing and pipeline rigid support, and liner layer is stainless
Steel or nickel-base alloy undertake corrosion resistant effect.It integrates the antiseptic property of the mechanical performance and internal lining pipe corrosion resistant alloy of base tube,
It is widely used in the fields such as petroleum gas, chemical industry, electric power, environmental protection, weaving in recent years.
Due to being limited by space, bimetallic mechanical multiple tube is unilateral welding procedure, and uses lining-transition zone-base
The welding sequence of layer, there are mainly three types of typical welding procedures.First, direct welding procedure, i.e., compound tube end is without any
Processing.The technique is since there are larger differences for the coefficient of thermal expansion of lining and parent metal, and pipe end binding force is weaker, lining and base
The problems such as layer is easily peelable and forms incomplete fusion defect；Second is that end sealing welding technique for extra first uses that is, before multiple tube butt welding
Stainless steel welding stick is first by lining and base's soldering.The welding procedure soldering and sealing layer quality control is more difficult, is also easy to produce defect and brittle
Tissue；Soldering and sealing root is cutting edge structure, is stress concentration point, easily becomes crack start；Third, end bead-welding technology, i.e., compound
Before pipe butt welding, a certain range of liner layer in multiple tube pipe end is removed by machining, uses weldering identical with lining
Material carries out built-up welding, and compound tube end mechanical bond is made to be changed into metallurgical binding.The technique is by stress collection caused by composite pipe structure
Middle position and the weak part of butt weld melt run separate, and using TIG built-up welding, that there are dilution rates is larger, corrosion resisting property reduces
Phenomena such as.Usually there are two types of modes for the selection of welding material：One is use all steel or Ni-based wlding, such selection mode
Weldquality is preferable and is easy to ensure, but welding cost is very high.Another kind is welded using a variety of wldings, i.e., lining is using stainless
Steel welding wire bottoming, transition zone is using high alloy welding wire, the strong matching carbon steel or low alloy steel wldings such as base uses.Since weld seam is more
Number part uses carbon steel or low alloy steel wlding, welding cost to substantially reduce, but because uses the built-up welding on high-grade material low
Grade wlding will produce brittle layer, the reduced performance of connector in weld seam.
Therefore the welding efficiency that multiple tube how could be realized in the case where ensureing welding quality becomes prior art hardly possible
To solve the problems, such as.
Invention content
For many deficiencies of the existing technology, the present invention provides a kind of welding methods of composite bimetal pipe, should
Method is directed to composite bimetal pipe, includes the welding of mechanical composite tube and metallurgical composite pipe, provides a kind of compound to bimetallic
The welding surface of pipe base carries out retaining wall on slope processing, and groove type is single V groove with root face, then TIG or MIG is used to carry out at pre- soldering and sealing
The mode of reason is welded, and whole welding is completed in such a way that more welding beads are superimposed, the above method can solve bimetallic
The problems such as multiple tube one side weld welding cost is high, joint quality is low and weld seam is anti-corrosion poor.
The specific technical solution of the present invention is：
A kind of welding method of composite bimetal pipe, key step are as follows：
Step 1: the processing and processing of welding groove
101, retaining wall on slope processing, groove are carried out to the welding surface of composite bimetal pipe base 1 using mach mode
Form is single V groove with root face, and angle of bevel β is 60 ± 5, and root face height h is 2~4mm；The weldering of composite bimetal pipe liner layer 2
Junction peels off a certain range, and width b is 5~8mm, and carrying out pre- soldering and sealing processing using TIG or MIG forms soldering and sealing layer 3, used
Wlding is the stainless steel or nickel-based welding wire than a 2 high grade of liner layer, and welding current is 70~90A, argon flow amount 18L~22L/
min；
Pre- soldering and sealing processing can form soldering and sealing layer 3 in base 1 and liner layer 2, and soldering and sealing layer 3 is used as metallurgical bonding layer, can
To prevent from making base 1 generate with liner layer 2 since the dissimilar steel coefficient of expansion is different in follow-up welding process and detaching；
102, groove cleans：Using wire brush to being polished and being cleaned within the scope of groove and its neighbouring 25cm, oil is prevented
Dirty and iron rust adverse effect caused by weld seam；
103, groove group pair：Check retaining wall on slope quality, it is ensured that the intact rear progress groove group of groove and its near zone
Right, groove group is 2~4mm to gap a；
Step 2: backing welding：Using TIG or MIG to base 1 carry out bottoming welding, formed welding bead 4, wlding used be with
1 same material of base or the similar welding wire of ingredient, welding current are 100~130A, and argon flow amount is 8~15L/min, bottoming welding
When molten bath should be avoided to be contacted with soldering and sealing layer 3, the generation for the martensite that prevents from hardening；
Step 3: base fills：Weldering is filled to base 1 using manual electric arc welding, filled layer 5 and 6 is formed, is used
Wlding be welding rod identical with welding wire material in step 2, welding current be 80~110A；
Step 4: liner layer welds：Under inert gas shielding, liner layer 2 is welded using TIG internal welding machines, respectively
Form liner layer filled layer 7 and liner layer capping layer 8；Used wlding is identical as the wlding of soldering and sealing layer 3, welding current selection
Ranging from 90~130A, argon flow amount are 8~15L/min；In welding process, welding current should be prevented excessive, lead to dilution rate
Become larger and beneficial element scaling loss, reduces the corrosion resisting property of weld seam；
Slightly smaller electric current should be used to reduce assuring welding quality when this step welds liner layer filled layer 7
The dissimilar steel penetration ratio of this layer, control alloying element dilution, liner layer capping layer 8 should ensure that higher than base material；
Step 5: base's capping layer：Cosmetic welding is carried out to base 1 using manual electric arc welding, capping layer 9 is formed, is used
Wlding be welding rod similar with 1 same material of base or ingredient, welding current be 80~110A.
Using the welding sequence, can be effectively ensured welding process be smoothed out and welding quality.It is sealed in advance first
Weldering processing can avoid base and liner layer separation in welding process, since base and liner layer component difference are larger, the two
Coefficient of thermal expansion difference is also very big, will produce between base and liner layer if directly being welded without pre- soldering and sealing, when welding larger
Gap causes welding job that can not carry out；Then carry out base's backing welding and filling weld, be in order to which welding point is rigidly connected,
Welded convenient for liner layer, it is preferential weld base be since the welding quality of advanced wlding built-up welding on rudimentary wlding is higher, if
The rudimentary wlding of built-up welding, then be susceptible to crackle on advanced wlding；Base's filler pass increases the thermal conductive surface of welding point simultaneously
Product is conducive to heat dissipation；Followed by the welding of liner layer, avoids using super-high-current, the corrosion resistance inside multiple tube is effectively ensured
Can, improve the quality of entire multiple tube；Brittle layer is avoided simultaneously to generate；It is due to interior diplomacy finally to carry out the cosmetic welding of base
The residual stress of welding point can be reduced for welding.
Bimetallic tube is welded using above-mentioned welding method, can to avoid on advanced wlding the rudimentary wlding of built-up welding this
Point is most important for different steel weld, and not forming transition zone can prevent welding point from generating martensite quench-hardened case, effectively
It ensure that the quality of welding point；It is cheap carbon steel or low alloy steel wlding to be filled primarily with material, and production cost is low, and more can
Ensure the mechanical property of welding point；Using two-sided welding, the residual stress of welding point is reduced, welding point is reduced and opens
Split possibility；The pipeline butt of liner layer welding process, metal welding, gas shield are automated job, effectively improve life
Produce efficiency.
Description of the drawings
Fig. 1 is divided edge structure schematic diagram in welding method of the present invention；
Fig. 2 is the structural schematic diagram of layer after groove welding in welding method of the present invention；
1 is base in figure；2 be liner layer；3 be soldering and sealing layer；4 be backing run；5 be base's first layer filled layer；6 be base
Layer second layer filled layer；7 be liner layer filled layer；8 be liner layer capping layer；9 be base's capping layer；
Fig. 3 is actual welding sequential schematic in embodiment 2, is actual welds layer road schematic diagram in embodiment 2.
Specific implementation mode
The specific implementation mode of form by the following examples does further specifically the above of the present invention
It is bright, but the range that this should not be interpreted as to the above-mentioned theme of the present invention is only limitted to example below.It is all to be based on the above of the present invention
The technology realized all belongs to the scope of the present invention.
Embodiment 1
A kind of welding method of composite bimetal pipe, key step are as follows：
Step 1: the processing and processing of welding groove
101, retaining wall on slope processing, groove are carried out to the welding surface of composite bimetal pipe base 1 using mach mode
Form is single V groove with root face；The welding surface of composite bimetal pipe liner layer 2 peels off a certain range, and width b is 5~8mm, using TIG or
MIG carries out pre- soldering and sealing processing and forms soldering and sealing layer 3, and used wlding is the stainless steel or Ni-based weldering than a 2 high grade of liner layer
Silk, welding current are 70~90A, argon flow amount 18L~22L/min；
102, groove cleans：Using wire brush to being polished and being cleaned within the scope of groove and its neighbouring 25cm, oil is prevented
Dirty and iron rust adverse effect caused by weld seam；
103, groove group pair：Check retaining wall on slope quality, it is ensured that the intact rear progress groove group of groove and its near zone
Right, groove group is 2~4mm to gap a；
Step 2: backing welding：Using TIG or MIG to base 1 carry out bottoming welding, formed welding bead 4, wlding used be with
1 same material of base or the similar welding wire of ingredient, welding current are 100~130A, and argon flow amount is 8~15L/min, bottoming welding
When molten bath should be avoided to be contacted with soldering and sealing layer 3, the generation for the martensite that prevents from hardening；
Step 3: base fills：Weldering is filled to base 1 using manual electric arc welding, filled layer 5 and 6 is formed, is used
Wlding be welding rod identical with welding wire material in step 2, welding current be 80~110A；
Step 4: liner layer welds：Under inert gas shielding, liner layer 2 is welded using TIG internal welding machines, respectively
Form liner layer filled layer 7 and liner layer capping layer 8；Used wlding is identical as the wlding of soldering and sealing layer 3, welding current selection
Ranging from 90~130A, argon flow amount are 8~15L/min；
Step 5: base's capping layer：Cosmetic welding is carried out to base 1 using manual electric arc welding, capping layer 9 is formed, is used
Wlding be welding rod similar with 1 same material of base or ingredient, welding current be 80~110A；
The wherein single V groove with root face angle of bevel β is 60 ± 5, and root face height h is 2~4mm.
The present embodiment is universal method, and to tubing, there is no limit.
Embodiment 2
A kind of welding method of composite bimetal pipe, (groundwork thickness is 12mm in the present embodiment, and liner layer thickness is 2mm,
Base is L415 pipe line steels, and liner layer is 316L austenitic stainless steels) key step is as follows：
Step 1: the processing and processing of welding groove
101, retaining wall on slope processing, groove are carried out to the welding surface of composite bimetal pipe base 1 using mach mode
Form is single V groove with root face；The welding surface of composite bimetal pipe liner layer 2 peels off a certain range, and width b is 5~8mm, using TIG or
MIG carries out pre- soldering and sealing processing and forms soldering and sealing layer 3, and used wlding is the stainless steel or Ni-based weldering than a 2 high grade of liner layer
Silk, welding current are 70~80A, argon flow amount 18L~22L/min；
102, groove cleans：Using wire brush to being polished and being cleaned within the scope of groove and its neighbouring 25cm, oil is prevented
Dirty and iron rust adverse effect caused by weld seam；
103, groove group pair：Check retaining wall on slope quality, it is ensured that the intact rear progress groove group of groove and its near zone
Right, groove group is 2~4mm to gap a；
Step 2: backing welding：Using TIG or MIG to base 1 carry out bottoming welding, formed welding bead 4, wlding used be with
1 same material of base or the similar welding wire of ingredient, welding current are 100~120A, and argon flow amount is 8~15L/min, bottoming welding
When molten bath should be avoided to be contacted with soldering and sealing layer 3, the generation for the martensite that prevents from hardening；
Step 3: base fills：Weldering is filled to base 1 using manual electric arc welding, filled layer 5 and 6 is formed, is used
Wlding be welding rod identical with welding wire material in step 2, welding current be 90~110A, according to groove developed width, base
It is filled with multilayer single-run welding；
Step 4: liner layer welds：Under inert gas shielding, liner layer 2 is welded using TIG internal welding machines, respectively
Form liner layer filled layer 7 and liner layer capping layer 8；Used wlding is identical as the wlding of soldering and sealing layer 3, welding current selection
Ranging from 90~130A, argon flow amount are 8~15L/min；
Step 5: base's capping layer：Cosmetic welding is carried out to base 1 using manual electric arc welding, capping layer 9 is formed, is used
Wlding be welding rod similar with 1 same material of base or ingredient, welding current is 90~110A, practical according to base cap weld
Width, base's cosmetic welding are single-run welding；
The wherein single V groove with root face angle of bevel β is 60 ± 5, and root face height h is 2~4mm.
Welding sequence as shown in Figure 3 (in Fig. 3 marked as actual welding sequence label), welds related item in the present embodiment
Part is as shown in table 1：
Table 1
In conjunction in Fig. 3 and upper table it can be seen that this welding method major part weld seam is filled using relatively inexpensive CHE507, institute
CHG56 market prices are about 15 yuan every kilogram in the welding wire of use, and CHE507 is about 8 yuan every kilogram, and ER309L is about every kilogram 60
Member, it is seen that the wlding advantage of lower cost in technical solution of the present invention, and avoid the rudimentary wlding band of the built-up welding on advanced wlding
The series of malpractice come.
Comparative example
Welding method provided by the present invention with conventional welding method compare as follows by inventor：
It can be seen that the present invention not only reduces the cost of welding, the prior art is also significantly better than in welding quality, have compared with
High promotional value.
Claims (2)
1. a kind of welding method of composite bimetal pipe, it is characterised in that：Key step is as follows：
Step 1: the processing and processing of welding groove
101, retaining wall on slope processing, groove shape are carried out to the welding surface of composite bimetal pipe base (1) using mach mode
Formula is single V groove with root face；The welding surface of composite bimetal pipe liner layer (2) peels off a certain range, and width b is 5~8mm, using TIG or
MIG carries out pre- soldering and sealing processing and forms soldering and sealing layer (3), and used wlding is the stainless steel or nickel of a grade higher than liner layer (2)
Base welding wire, welding current are 70~90A, argon flow amount 18L~22L/min；
102, groove cleans：Using wire brush to being polished and cleaned within the scope of groove and its neighbouring 25cm, prevent greasy dirt and
Iron rust adverse effect caused by weld seam；
103, groove group pair：Check retaining wall on slope quality, it is ensured that the intact rear progress groove group pair of groove and its near zone, slope
Mouth group is 2~4mm to gap a；
Step 2: backing welding：Using TIG or MIG to base (1) carry out bottoming welding, formed welding bead (4), wlding used be with
Base's (1) same material or the similar welding wire of ingredient, welding current are 100~130A, and argon flow amount is 8~15L/min, backing welding
Molten bath should be avoided to be contacted with soldering and sealing layer (3) when connecing, the generation for the martensite that prevents from hardening；
Step 3: base fills：Weldering is filled to base (1) using manual electric arc welding, filled layer (5) and (6) is formed, is adopted
Wlding is welding rod identical with welding wire material in step 2, and welding current is 80~110A；
Step 4: liner layer welds：Under inert gas shielding, liner layer (2) is welded using TIG internal welding machines, respectively shape
At liner layer filled layer (7) and liner layer capping layer (8)；Used wlding is identical as the wlding of soldering and sealing layer (3), welding current
Range of choice is 90~130A, and argon flow amount is 8~15L/min；
Step 5: base's capping layer：Cosmetic welding is carried out to base (1) using manual electric arc welding, capping layer (9) is formed, is used
Wlding be welding rod similar with base's (1) same material or ingredient, welding current be 80~110A.
2. the welding method of composite bimetal pipe according to claim 1, it is characterised in that：
The wherein single V groove with root face angle of bevel β is 60 ± 5, and root face height h is 2~4mm.
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| CN201810587971.9A CN108500429A (en) | 2018-06-07 | 2018-06-07 | A kind of welding method of composite bimetal pipe |
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| CN201810587971.9A CN108500429A (en) | 2018-06-07 | 2018-06-07 | A kind of welding method of composite bimetal pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109483009A (en) * | 2018-10-31 | 2019-03-19 | 中国石油天然气集团有限公司 | A kind of manufacturing method of composite bimetal pipe end portion treatment structure |
| CN110961763A (en) * | 2018-09-28 | 2020-04-07 | 河北汇中管道装备有限公司 | Method for welding bimetal composite pipe fitting and pipeline |
| CN111843105A (en) * | 2020-07-28 | 2020-10-30 | 沧州隆泰迪管道科技有限公司 | Automatic backing welding process for prefabrication of bimetal composite pipeline |
| CN112658484A (en) * | 2020-07-17 | 2021-04-16 | 中国石油大学(华东) | Welding method of titanium steel bimetal composite plate |
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| CN110961763A (en) * | 2018-09-28 | 2020-04-07 | 河北汇中管道装备有限公司 | Method for welding bimetal composite pipe fitting and pipeline |
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| CN112658484A (en) * | 2020-07-17 | 2021-04-16 | 中国石油大学(华东) | Welding method of titanium steel bimetal composite plate |
| CN111843105A (en) * | 2020-07-28 | 2020-10-30 | 沧州隆泰迪管道科技有限公司 | Automatic backing welding process for prefabrication of bimetal composite pipeline |
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