CN107538142B - A kind of welding procedure of straight seam welded pipe - Google Patents
A kind of welding procedure of straight seam welded pipe Download PDFInfo
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- CN107538142B CN107538142B CN201610483298.5A CN201610483298A CN107538142B CN 107538142 B CN107538142 B CN 107538142B CN 201610483298 A CN201610483298 A CN 201610483298A CN 107538142 B CN107538142 B CN 107538142B
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Abstract
The present invention provides a kind of welding procedures of straight seam welded pipe, are related to pipeline welding technology field.By the way that roll of steel plate is welded into tool there are five the straight seam welded pipe of layer, include the following steps: the steel plate making retaining wall on slope to obtain to be in curly steel plate；Tack welding is grouped to the curly steel plate, to form the matrix of the straight seam welded pipe；Back welding, interior weldering filling weldering, interior weldering cosmetic welding, outside weld filling weldering and outside weld cosmetic welding are successively carried out to the matrix of the straight seam welded pipe, can be obtained straight seam welded pipe of the tool there are five layer.
Description
Technical field
The present invention relates to pipeline welding technology field more particularly to a kind of welding procedures of straight seam welded pipe.
Background technique
A691 Gr11 CL2 alloy pipe is American Society Testing and Materials' material (American Society for
Testing and Materials, ASTM), belong to 1.25Cr-0.5Mo system pearlite heatproof steel, the country is with its similar material
14Cr1Mo (chrome molybdenum heat resisting steel), the material have good elevated temperature strength, inoxidizability and sulfuration resistant less than 500 DEG C or less
Object corrosivity is widely used in coal chemical industry, petrochemical industry high-temperature and pressure pipeline, container and reactors for synthesis of ammonia, hydrogenation reaction
In the devices such as device.
Currently, the welding of chrome molybdenum steel conduit also uses the welding method of traditional manual argon arc welding bottoming, welding electrode arc welding
Fill capping.However, the welding workload of the conventional method is big, the weld job time is long, and large labor intensity production efficiency is low, together
When welding quality it is undesirable, weldment qualification rate is low, and there are many defects.
Summary of the invention
The object of the present invention is to provide a kind of welding procedures of straight seam welded pipe, are used to prepare out the conjunction of chrome-molybdenum steel high temperature and pressure
Gold solder pipe.
The technical scheme to solve the above technical problems is that
A kind of welding procedure of straight seam welded pipe, by the way that roll of steel plate is welded into tool, there are five the straight seam welded pipe of layer, including
Following steps:
Step S1, the steel plate is made retaining wall on slope to obtain is in curly steel plate；
Step S2, tack welding is grouped to the curly steel plate, to form the matrix of the straight seam welded pipe；
Step S3, back welding is carried out to the matrix of the straight seam welded pipe, to obtain the straight seam welded pipe with the first layer；
Step S4, interior weldering filling weldering is carried out to the straight seam welded pipe with the first layer, to obtain with the second layer
Straight seam welded pipe；
Step S5, interior weldering cosmetic welding is carried out to the straight seam welded pipe with the second layer, there is third layer to obtain
Straight seam welded pipe；
Step S6, the straight seam welded pipe to described with third layer carries out outside weld filling weldering, has the 4th layer to obtain
Straight seam welded pipe；
Step S7, outside weld cosmetic welding is carried out to the straight seam welded pipe with the 4th layer, there is the 5th layer to obtain
Straight seam welded pipe, the straight seam welded pipe with the 5th layer is the tool there are five the straight seam welded pipe of layer.
Based on the above technical solution, the present invention can also be improved as follows:
Optionally, before tack welding is grouped, the pre-heat treatment need to be carried out to the curly steel plate, wherein institute
The heat range for stating the pre-heat treatment is on the basis of groove center line, and two sides are respectively not less than three times of the wall thickness of the steel plate and not
Less than 100mm, while to being kept the temperature in 100mm except the heat range；
The pre-heat treatment is preheated using tracklayer heater or flame device, and the temperature of the preheating is greater than 200 DEG C.
Optionally, in the step S2, group is greater than 20mm to the length of tack welding, and group is greater than the spacing of tack welding
200mm。
Optionally, before carrying out step S1, removing surface need to be carried out to the steel plate, the removing surface is will be described
Groove face and its greasy dirt, oxide and corrosion in edge 50mm are removed clean.
Optionally, the removing surface be specifically use electric angle grinder by the steel plate corrosion and oxide cmp
Polishing is clean, so that the steel plate is exposed metallic luster, then remove the greasy dirt on the steel plate with acetone soln.
Optionally, in the step S3, the back welding uses gas metal-arc welding, and power supply uses DC power supply
Reversal connection, gage of wire 1.2mm, welding current are 150A~190A, and weldingvoltage is 22V~28V, speed of welding 36cm/
Min~43cm/min；
In the step S4, the interior weldering filling weldering uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min；
In the step S5, the interior weldering cosmetic welding uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min；
In the step S6, the outside weld filling weldering uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min；
In the step S7, the outside weld cosmetic welding uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min。
Optionally, in step s 6, it needs to carry out back chipping processing before the outside weld cosmetic welding, the back chipping processing is specific
It is to remove the weld seam of first layer.
Optionally, temperature difference when welding between adjacent layer is controlled at 200 DEG C -250 DEG C.
Optionally, it in step S3-S7, needs to carry out dehydrogenation immediately after the completion of each step, the dehydrogenation tool
Body is the rear heat carried out at 250 DEG C -300 DEG C 30 minutes, then keeps the temperature slow cooling.
It optionally, need to be to the straight seam welded pipe progress post weld heat treatment of layer there are five the tools, institute after the completion of step S7
Stating post weld heat treatment is to be placed in the tool at 640 DEG C -660 DEG C there are five the straight seam welded pipe of layer to keep the temperature 1 hour.
Beneficial effects of the present invention:
1. the welding manner that the present invention is combined using filling weldering and cosmetic welding keeps appearance of weld beautiful, appearance of weld matter
It measures, is not in the welding defects such as crackle, stomata, slag inclusion in forming welding tube, while also avoiding weldment in welding process and flying
It splashes or situation that weldment is lack of penetration；
2. welding procedure of the invention can make solder yield reach 100%, speed of welding is also than very fast, welding production
It is high-efficient；
3. welding procedure of the invention can eliminate welding residual stress, the mechanical performance of welding point is improved, prevents from welding
Pipe deformation.
Detailed description of the invention
Fig. 1 is the flow chart of the welding procedure of the straight seam welded pipe of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the welding tractor of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the straight seam welded pipe of the embodiment of the present invention；
Fig. 4 is the cross-sectional view of the weld seam of straight seam welded pipe shown in Fig. 3.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
The welding manner that the present invention is combined using filling weldering and cosmetic welding keeps appearance of weld beautiful, quality of weld seam molding
It is good, it is not in the welding defects such as crackle, stomata, slag inclusion in forming welding tube, while also avoiding weldment in welding process and splashing
Or the situation that weldment is lack of penetration；
Welding procedure of the invention can make solder yield reach 100%, and speed of welding is also than very fast, welding production effect
Rate is high；
Welding procedure of the invention can eliminate welding residual stress, improve the mechanical performance of welding point, prevent welded tube
Deformation.
Fig. 1 is the flow chart of the welding procedure of the straight seam welded pipe 1 of the embodiment of the present invention.Referring to Fig. 1, the present invention provides one
The welding procedure of kind straight seam welded pipe 1 is included the following steps: by the way that roll of steel plate is welded into tool there are five the straight seam welded pipe 1 of layer
Step S1, the steel plate is made retaining wall on slope to obtain is in curly steel plate；
Step S2, tack welding is grouped to the curly steel plate, to form the matrix of the straight seam welded pipe 1；
Step S3, back welding is carried out to the matrix of the straight seam welded pipe 1, to obtain the straight seam welded pipe with the first layer 7
1；
Step S4, interior weldering filling weldering is carried out to the straight seam welded pipe 1 with the first layer 7, there is the second weldering to obtain
The straight seam welded pipe 1 of layer 8；
Step S5, interior weldering cosmetic welding is carried out to the straight seam welded pipe 1 with the second layer 8, there is third weldering to obtain
The straight seam welded pipe 1 of layer 9；
Step S6, the straight seam welded pipe 1 to described with third layer 9 carries out outside weld filling weldering, has the 4th weldering to obtain
The straight seam welded pipe 1 of layer 10；
Step S7, outside weld cosmetic welding is carried out to the straight seam welded pipe 1 with the 4th layer 10, there is the 5th weldering to obtain
The straight seam welded pipe 1 of layer 11, the straight seam welded pipe 1 with the 5th layer 11 are that there are five the straight seam welded pipe 1 of layer for the tool.
Before carrying out step S1, removing surface need to be carried out to the steel plate, the removing surface is by the groove table
Face and its greasy dirt, oxide and corrosion in edge 50mm are removed clean.
Wherein, the removing surface be specifically use electric angle grinder by the steel plate corrosion and oxide cmp beat
Mill is clean, so that the steel plate is exposed metallic luster, then remove the greasy dirt on the steel plate with acetone soln.
Then, the steel plate is made retaining wall on slope to obtain is in curly steel plate.It also needs to the curly steel
Plate carries out the pre-heat treatment, wherein the heat range of the pre-heat treatment is on the basis of groove center line, and two sides are respectively not less than institute
State the three times of the wall thickness of steel plate and not less than 100mm, while to being kept the temperature in 100mm except the heat range；
Wherein, the pre-heat treatment is preheated using tracklayer heater or flame device, and the temperature of the preheating is greater than
200℃。
In the step S2, group is in the form docked by curly steel plate in curly steel plate to tack welding
It is segmented welding on butt joint edge, the weld seam 6 in subsequent welding can be formed.Group is greater than 20mm to the length of tack welding,
Group is greater than 200mm to the spacing of tack welding.
In the step S3, the back welding uses gas metal-arc welding, and power supply is reversely connected using DC power supply, weldering
Silk diameter be 1.2mm, welding current be 150A~190A, weldingvoltage be 22V~28V, speed of welding be 36cm/min~
43cm/min.Back welding is to carry out back welding to weld seam 6 on the basis of group is to tack welding, can eliminate butt weld in this way
Gap provides to guarantee for the quality of welding inner portion hereafter.
In the step S4, the interior weldering filling weldering uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min.Interior weldering filled layer is carried out on the basis of back welding from the inside of straight seam welded pipe 1.
In the step S5, the interior weldering cosmetic welding uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min.Interior weldering cosmetic welding is also to carry out on the basis of welding cosmetic welding including the inside of straight seam welded pipe 1.
In the step S6, the outside weld filling weldering uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min.Outside weld filling weldering is carried out on the basis of back welding from the outside of straight seam welded pipe 1.Also, interior weldering filling weldering and outside weld
Filling weldering is symmetrical relative to weld seam.
In the step S7, the outside weld cosmetic welding uses Lincoln weld, and power supply is reversely connected using DC power supply, welding wire
Diameter is 4.0mm, and welding current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/
min.Outside weld cosmetic welding is carried out on the basis of outside weld is filled and welded from the outside of straight seam welded pipe 1.Also, interior weldering cosmetic welding with
Outside weld cosmetic welding is symmetrical relative to weld seam.
Optionally, in step s 6, it needs to carry out back chipping processing before the outside weld cosmetic welding, the back chipping processing is specific
It is to remove the weld seam 6 of first layer 7.
Optionally, temperature difference when welding between adjacent layer is controlled at 200 DEG C -250 DEG C.
Optionally, it in step S3-S7, needs to carry out dehydrogenation immediately after the completion of each step, the dehydrogenation tool
Body is the rear heat carried out at 250 DEG C -300 DEG C 30 minutes, then keeps the temperature slow cooling.
Optionally, after the completion of step S7, need to the tool there are five layer straight seam welded pipe 1 carry out post weld heat treatment,
The post weld heat treatment is to be placed in the tool at 640 DEG C -660 DEG C there are five the straight seam welded pipe 1 of layer to keep the temperature 1 hour.
In three preferred embodiments of the invention, using A387 chrome molybdenum steel plate as base material, wherein A387 is high-temperature high-pressure
Force container steel plate, tensile strength are 415~585MPa, and manufacture grade is CL22.The present embodiment uses welding tractor 2 for welding
Equipment, the chrome-molybdenum steel high temperature and pressure alloy straight seam welded pipe 1 that preparation specification is 914 × 15mm of φ.
Fig. 2 is the structural schematic diagram of the welding tractor 2 of the preferred embodiment of the present invention.It referring to fig. 2, further include welding bars and branch
Seat 5, straight seam welded pipe 1 is securely fitted on welding tractor 2 and can move together with welding tractor 2, and plumb joint 3 is fixedly mounted on weldering
One end of extension bar, welding bars pass through the support 5 fixed on the ground and accept plumb joint 3, and the other end of welding bars is equipped with counterweight
Block 4, to guarantee the stabilization of plumb joint 3.
The embodiment of the present invention carries out being welded for straight seam welded pipe by welding tractor, greatly improves work efficiency, and
Improve the quality of straight seam welded pipe.
Fig. 3 is the structural schematic diagram of the straight seam welded pipe 1 of the embodiment of the present invention.Referring to Fig. 3, straight seam welded pipe 1 has a straight line
The weld seam 6 of type.
Fig. 4 is the cross-sectional view of the weld seam 6 of straight seam welded pipe 1 shown in Fig. 3.Referring to fig. 4, it is carried out first at weld seam 6
The welding of the first layer 7 is realized in one layer of back welding.Then, interior weldering is carried out to the straight seam welded pipe 1, plumb joint 3 is put in directly
Inside seam welded tube 1, mobile welding tractor 2 realizes the welding of the second layer 8 and third layer 9.Then to the straight seam welded pipe 1 into
Plumb joint 3 is directly placed at the weld seam 6 of straight seam welded pipe 1 by row outside weld, and mobile welding tractor 2 realizes the 4th layer 10 and the 5th
The welding of layer 11.
Three embodiments are different for welding process parameter below, and welding process carries out in the following order referring to Fig. 1.
Embodiment 1
A. removing surface.Removing surface to steel is by the greasy dirt in the groove face and its edge 50mm, oxidation
Object and corrosion are removed clean.Specifically, removing surface be using electric angle grinder by the steel plate corrosion and oxide
Polishing grinding is clean, so that the steel plate is exposed metallic luster, then remove the greasy dirt on the steel plate with acetone soln.
B. retaining wall on slope.It is in curly steel plate that the steel plate, which is made retaining wall on slope, to obtain.
C. the pre-heat treatment.The pre-heat treatment is carried out to the curly steel plate, wherein the heat range of the pre-heat treatment
It is on the basis of groove center line, two sides are respectively not less than the three times of the wall thickness of the steel plate and not less than 100mm, while to described
It is kept the temperature in 100mm except heat range.
The pre-heat treatment is preheated using tracklayer heater or flame device, and the temperature of the preheating is greater than 200 DEG C.
D. group is to tack welding.Tack welding is grouped to the curly steel plate, to form the base of the straight seam welded pipe 1
Body.
Group is greater than 20mm to the length of tack welding, and group is greater than 200mm to the spacing of tack welding.
E. back welding.Back welding is carried out to the matrix of the straight seam welded pipe 1, to obtain the straight weld with the first layer 7
Pipe 1.The back welding uses gas metal-arc welding (GMAW), and power supply is using DC power supply reversal connection (DCEP), welding wire model
For ER55-B2, gage of wire 1.2mm, welding current 150A, weldingvoltage 22V, speed of welding 36cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the first layer 7, the dehydrogenation is specifically at 250 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
The gap of butt weld 6 can be eliminated by carrying out back welding, provide guarantee for the interior weldering of Lincoln weld hereafter
Quality.
F. weldering filling weldering in.Interior weldering filling weldering is carried out to the straight seam welded pipe 1 with the first layer 7, to be had
The straight seam welded pipe 1 of second layer 8.The interior weldering filling weldering uses Lincoln weld (SAW), and power supply is reversely connected using DC power supply
(DCEP), the welding wire trade mark be H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark be SJ101-G, welding current 405A,
Weldingvoltage is 30V, speed of welding 26cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the second layer 8, the dehydrogenation is specifically at 250 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
G. cosmetic welding is welded in.Interior weldering cosmetic welding is carried out to the straight seam welded pipe 1 with the second layer 8, to be had
The straight seam welded pipe 1 of third layer 9.The interior weldering cosmetic welding uses Lincoln weld (SAW), and power supply is reversely connected using DC power supply
(DCEP), the welding wire trade mark be H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark be SJ101-G, welding current 405A,
Weldingvoltage is 30V, speed of welding 26cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with third layer 9, the dehydrogenation is specifically at 250 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
H. outside weld filling weldering.The straight seam welded pipe 1 with third layer 9 is carried out, there is the 4th layer 10 to obtain
Straight seam welded pipe 1.It needs to carry out back chipping processing before the outside weld cosmetic welding, the back chipping processing is specifically to weld described first
The weld seam 6 of layer 7 removes.The outside weld filling weldering uses Lincoln weld (SAW), and power supply is reversely connected (DCEP) using DC power supply,
The welding wire trade mark is H08CrMoVA, and gage of wire 4.0mm, the solder flux trade mark is SJ101-G, welding current 405A, weldingvoltage
For 30V, speed of welding 26cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the 4th layer 10, the dehydrogenation is specifically at 250 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
I. outside weld cosmetic welding.Outside weld cosmetic welding is carried out to the straight seam welded pipe 1 with the 4th layer 10, to be had
The straight seam welded pipe 1 of 5th layer 11, the straight seam welded pipe 1 with the 5th layer 11 are that there are five the vertical masonry joints of layer for the tool
Welded tube 1.The outside weld cosmetic welding uses Lincoln weld (SAW), and power supply is using DC power supply reversal connection (DCEP), the welding wire trade mark
H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark are SJ101-G, welding current 405A, weldingvoltage 30V, welding
Speed is 26cm/min.
To the tool, there are five the straight seam welded pipe 1 of layer to carry out dehydrogenation, and the dehydrogenation is specifically at 250 DEG C
The rear heat for carrying out 30 minutes, then keeps the temperature slow cooling.
It should be noted that needing to control the temperature difference between adjacent layer at 200 DEG C during welding.Control
Interlayer temperature is that cooling rate forms hardened structure and influence the evolution of diffusible hydrogen very much fastly in order to prevent.
Welding point such as finds that welding defect must carry out repair welding, repair welding uses welding electrode arc welding through nondestructiving inspecting test
(SMAW), type of electrode R307H, core diameter 3.2mm, power supply are using DC power supply reversal connection (DCEP), welding current
The temperature of 94A, weldingvoltage 22V, speed of welding 8cm/min, interpass control between 200 DEG C.Using welding rod arc soldering
Weldering can tiny flaw in Rapid-Repair welding point, especially suitable for producing and the repairing of construction site.
Finally, need to be to the tool there are five the progress post weld heat treatment of the straight seam welded pipe 1 of layer, the post weld heat treatment is will
The tool is placed at 640 DEG C there are five the straight seam welded pipe 1 of layer and keeps the temperature 1 hour.Post weld heat treatment is remaining in order to eliminate welding
Stress improves the mechanical performance of welding point, prevents welded tube from deforming.
Embodiment 2
A. removing surface.Removing surface to steel is by the greasy dirt in the groove face and its edge 50mm, oxidation
Object and corrosion are removed clean.Specifically, removing surface be using electric angle grinder by the steel plate corrosion and oxide
Polishing grinding is clean, so that the steel plate is exposed metallic luster, then remove the greasy dirt on the steel plate with acetone soln.
B. retaining wall on slope.It is in curly steel plate that the steel plate, which is made retaining wall on slope, to obtain.
C. the pre-heat treatment.The pre-heat treatment is carried out to the curly steel plate, wherein the heat range of the pre-heat treatment
It is on the basis of groove center line, two sides are respectively not less than the three times of the wall thickness of the steel plate and not less than 100mm, while to described
It is kept the temperature in 100mm except heat range.
The pre-heat treatment is preheated using tracklayer heater or flame device, and the temperature of the preheating is greater than 200 DEG C.
D. group is to tack welding.Tack welding is grouped to the curly steel plate, to form the base of the straight seam welded pipe 1
Body.
Group is greater than 20mm to the length of tack welding, and group is greater than 200mm to the spacing of tack welding.
E. back welding.Back welding is carried out to the matrix of the straight seam welded pipe 1, to obtain the straight weld with the first layer 7
Pipe 1.The back welding uses gas metal-arc welding (GMAW), and power supply is using DC power supply reversal connection (DCEP), welding wire model
For ER55-B2, gage of wire 1.2mm, welding current 190A, weldingvoltage 28V, speed of welding 43cm/min.
The straight seam welded pipe 1 for having the first layer 7 to described carries out dehydrogenation, the dehydrogenation be specifically 250 DEG C-
The rear heat that 30 minutes are carried out at 300 DEG C, then keeps the temperature slow cooling.
The gap of butt weld 6 can be eliminated by carrying out back welding, provide guarantee for the interior weldering of Lincoln weld hereafter
Quality.
F. weldering filling weldering in.Interior weldering filling weldering is carried out to the straight seam welded pipe 1 with the first layer 7, to be had
The straight seam welded pipe 1 of second layer 8.The interior weldering filling weldering uses Lincoln weld (SAW), and power supply is reversely connected using DC power supply
(DCEP), the welding wire trade mark be H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark be SJ101-G, welding current 495A,
Weldingvoltage is 34V, speed of welding 34cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the second layer 8, the dehydrogenation is specifically at 300 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
G. cosmetic welding is welded in.Interior weldering cosmetic welding is carried out to the straight seam welded pipe 1 with the second layer 8, to be had
The straight seam welded pipe 1 of third layer 9.The interior weldering cosmetic welding uses Lincoln weld (SAW), and power supply is reversely connected using DC power supply
(DCEP), the welding wire trade mark be H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark be SJ101-G, welding current 495A,
Weldingvoltage is 34V, speed of welding 34cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with third layer 9, the dehydrogenation is specifically at 300 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
H. outside weld filling weldering.The straight seam welded pipe 1 with third layer 9 is carried out, there is the 4th layer 10 to obtain
Straight seam welded pipe 1.It needs to carry out back chipping processing before the outside weld cosmetic welding, the back chipping processing is specifically to weld described first
The weld seam 6 of layer 7 removes.The outside weld filling weldering uses Lincoln weld (SAW), and power supply is reversely connected (DCEP) using DC power supply,
The welding wire trade mark is H08CrMoVA, and gage of wire 4.0mm, the solder flux trade mark is SJ101-G, welding current 495A, weldingvoltage
For 34V, speed of welding 34cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the 4th layer 10, the dehydrogenation is specifically at 300 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
I. outside weld cosmetic welding.Outside weld cosmetic welding is carried out to the straight seam welded pipe 1 with the 4th layer 10, to be had
The straight seam welded pipe 1 of 5th layer 11, the straight seam welded pipe 1 with the 5th layer 11 are that there are five the vertical masonry joints of layer for the tool
Welded tube 1.The outside weld cosmetic welding uses Lincoln weld (SAW), and power supply is using DC power supply reversal connection (DCEP), the welding wire trade mark
H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark are SJ101-G, welding current 495A, weldingvoltage 34V, welding
Speed is 34cm/min.
To the tool, there are five the straight seam welded pipe 1 of layer to carry out dehydrogenation, and the dehydrogenation is specifically at 300 DEG C
The rear heat for carrying out 30 minutes, then keeps the temperature slow cooling.
It should be noted that needing to control the temperature difference between adjacent layer at 250 DEG C during welding.Control
Interlayer temperature is that cooling rate forms hardened structure and influence the evolution of diffusible hydrogen very much fastly in order to prevent.
Welding point such as finds that welding defect must carry out repair welding, repair welding uses welding electrode arc welding through nondestructiving inspecting test
(SMAW), type of electrode R307H, core diameter are 3.2 or 4.0mm, and power supply is using DC power supply reversal connection (DCEP), welding electricity
Stream is 184A, weldingvoltage 26V, speed of welding 12cm/min, and the temperature of interpass controls between 250 DEG C.Using welding rod
Arc welding repair welding can tiny flaw in Rapid-Repair welding point, especially suitable for producing and the repairing of construction site.
Finally, need to be to the tool there are five the progress post weld heat treatment of the straight seam welded pipe 1 of layer, the post weld heat treatment is will
The tool is placed at 660 DEG C there are five the straight seam welded pipe 1 of layer and keeps the temperature 1 hour.Post weld heat treatment is remaining in order to eliminate welding
Stress improves the mechanical performance of welding point, prevents welded tube from deforming.
Embodiment 3
A. removing surface.Removing surface to steel is by the greasy dirt in the groove face and its edge 50mm, oxidation
Object and corrosion are removed clean.Specifically, removing surface be using electric angle grinder by the steel plate corrosion and oxide
Polishing grinding is clean, so that the steel plate is exposed metallic luster, then remove the greasy dirt on the steel plate with acetone soln.
B. retaining wall on slope.It is in curly steel plate that the steel plate, which is made retaining wall on slope, to obtain.
C. the pre-heat treatment.The pre-heat treatment is carried out to the curly steel plate, wherein the heat range of the pre-heat treatment
It is on the basis of groove center line, two sides are respectively not less than the three times of the wall thickness of the steel plate and not less than 100mm, while to described
It is kept the temperature in 100mm except heat range.
The pre-heat treatment is preheated using tracklayer heater or flame device, and the temperature of the preheating is greater than 200 DEG C.
D. group is to tack welding.Tack welding is grouped to the curly steel plate, to form the base of the straight seam welded pipe 1
Body.
Group is greater than 20mm to the length of tack welding, and group is greater than 200mm to the spacing of tack welding.
E. back welding.Back welding is carried out to the matrix of the straight seam welded pipe 1, to obtain the straight weld with the first layer 7
Pipe 1.The back welding uses gas metal-arc welding (GMAW), and power supply is using DC power supply reversal connection (DCEP), welding wire model
For ER55-B2, gage of wire 1.2mm, welding current 170A, weldingvoltage 25V, speed of welding 40cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the first layer 7, the dehydrogenation is specifically at 275 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
The gap of butt weld 6 can be eliminated by carrying out back welding, provide guarantee for the interior weldering of Lincoln weld hereafter
Quality.
F. weldering filling weldering in.Interior weldering filling weldering is carried out to the straight seam welded pipe 1 with the first layer 7, to be had
The straight seam welded pipe 1 of second layer 8.The interior weldering filling weldering uses Lincoln weld (SAW), and power supply is reversely connected using DC power supply
(DCEP), the welding wire trade mark be H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark be SJ101-G, welding current 450A,
Weldingvoltage is 32V, speed of welding 30cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the second layer 8, the dehydrogenation is specifically at 275 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
G. cosmetic welding is welded in.Interior weldering cosmetic welding is carried out to the straight seam welded pipe 1 with the second layer 8, to be had
The straight seam welded pipe 1 of third layer 9.The interior weldering cosmetic welding uses Lincoln weld (SAW), and power supply is reversely connected using DC power supply
(DCEP), the welding wire trade mark be H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark be SJ101-G, welding current 450A,
Weldingvoltage is 32V, speed of welding 30cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with third layer 9, the dehydrogenation is specifically at 275 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
H. outside weld filling weldering.The straight seam welded pipe 1 with third layer 9 is carried out, there is the 4th layer 10 to obtain
Straight seam welded pipe 1.It needs to carry out back chipping processing before the outside weld cosmetic welding, the back chipping processing is specifically to weld described first
The weld seam 6 of layer 7 removes.The outside weld filling weldering uses Lincoln weld (SAW), and power supply is reversely connected (DCEP) using DC power supply,
The welding wire trade mark is H08CrMoVA, and gage of wire 4.0mm, the solder flux trade mark is SJ101-G, welding current 450A, weldingvoltage
For 32V, speed of welding 30cm/min.
Dehydrogenation is carried out to the straight seam welded pipe 1 with the 4th layer 10, the dehydrogenation is specifically at 275 DEG C
Shi Jinhang 30 minutes rear heat, then keeps the temperature slow cooling.
I. outside weld cosmetic welding.Outside weld cosmetic welding is carried out to the straight seam welded pipe 1 with the 4th layer 10, to be had
The straight seam welded pipe 1 of 5th layer 11, the straight seam welded pipe 1 with the 5th layer 11 are that there are five the vertical masonry joints of layer for the tool
Welded tube 1.The outside weld cosmetic welding uses Lincoln weld (SAW), and power supply is using DC power supply reversal connection (DCEP), the welding wire trade mark
H08CrMoVA, gage of wire 4.0mm, the solder flux trade mark are SJ101-G, welding current 450A, weldingvoltage 32V, welding
Speed is 30cm/min.
To the tool, there are five the straight seam welded pipe 1 of layer to carry out dehydrogenation, and the dehydrogenation is specifically at 275 DEG C
The rear heat for carrying out 30 minutes, then keeps the temperature slow cooling.
It should be noted that needing to control the temperature difference between adjacent layer at 225 DEG C during welding.Control
Interlayer temperature is that cooling rate forms hardened structure and influence the evolution of diffusible hydrogen very much fastly in order to prevent.
Welding point such as finds that welding defect must carry out repair welding, repair welding uses welding electrode arc welding through nondestructiving inspecting test
(SMAW), type of electrode R307H, core diameter 3.6mm, power supply are using DC power supply reversal connection (DCEP), welding current
The temperature of 126A, weldingvoltage 24V, speed of welding 10cm/min, interpass control between 225 DEG C.Using welding electrode arc welding
Repair welding can tiny flaw in Rapid-Repair welding point, especially suitable for producing and the repairing of construction site.
Finally, need to be to the tool there are five the progress post weld heat treatment of the straight seam welded pipe 1 of layer, the post weld heat treatment is will
The tool is placed at 650 DEG C there are five the straight seam welded pipe 1 of layer and keeps the temperature 1 hour.Post weld heat treatment is remaining in order to eliminate welding
Stress improves the mechanical performance of welding point, prevents welded tube from deforming.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of welding procedure of straight seam welded pipe, using A387 chrome molybdenum steel plate as base material, preparation specification is 914 × 15mm's of φ
Chrome-molybdenum steel high temperature and pressure alloy straight seam welded pipe, by the way that roll of steel plate is welded into tool there are five the straight seam welded pipe of layer, feature exists
In including the following steps:
Step S1, the steel plate is made retaining wall on slope to obtain is in curly steel plate；
Step S2, tack welding is grouped to the curly steel plate, to form the matrix of the straight seam welded pipe, group is to positioning
The length of weldering is greater than 20mm, and group is greater than 200mm to the spacing of tack welding；
Step S3, back welding is carried out to the matrix of the straight seam welded pipe, to obtain the straight seam welded pipe with the first layer, the envelope
Back welding uses gas metal-arc welding, and power supply is reversely connected using DC power supply, gage of wire 1.2mm, welding current 150A
~190A, weldingvoltage are 22V~28V, and speed of welding is 36cm/min~43cm/min；
Step S4, interior weldering filling weldering is carried out to the straight seam welded pipe with the first layer, it is straight with the second layer to obtain
Seam welded tube, the interior weldering filling weldering use Lincoln weld, and power supply is reversely connected using DC power supply, gage of wire 4.0mm, welding
Electric current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/min；
Step S5, interior weldering cosmetic welding is carried out to the straight seam welded pipe with the second layer, there is the straight of third layer to obtain
Seam welded tube, the interior weldering cosmetic welding use Lincoln weld, and power supply is reversely connected using DC power supply, gage of wire 4.0mm, welding
Electric current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/min；
Step S6, the straight seam welded pipe to described with third layer carries out outside weld filling weldering, has the straight of the 4th layer to obtain
Seam welded tube, the outside weld filling weldering use Lincoln weld, and power supply is reversely connected using DC power supply, gage of wire 4.0mm, welding
Electric current is 405A~495A, and weldingvoltage is 30V~34V, and speed of welding is 26cm/min~34cm/min；
Step S7, outside weld cosmetic welding is carried out to the straight seam welded pipe with the 4th layer, there is the straight of the 5th layer to obtain
Seam welded tube, the straight seam welded pipe with the 5th layer are that there are five the straight seam welded pipe of layer, the outside weld cappings for the tool
Weldering uses Lincoln weld, and power supply is reversely connected using DC power supply, gage of wire 4.0mm, and welding current is 405A~495A, weldering
Connecing voltage is 30V~34V, and speed of welding is 26cm/min~34cm/min.
2. the welding procedure of straight seam welded pipe according to claim 1, which is characterized in that before tack welding is grouped,
The pre-heat treatment need to be carried out to the curly steel plate, wherein the heat range of the pre-heat treatment is to be with groove center line
Benchmark, two sides are respectively not less than the three times of the wall thickness of the steel plate and not less than 100mm, at the same to the heat range except
It is kept the temperature in 100mm；
The pre-heat treatment is preheated using tracklayer heater or flame device, and the temperature of the preheating is greater than 200 DEG C.
3. the welding procedure of straight seam welded pipe according to claim 1, which is characterized in that before carrying out step S1, need pair
The steel plate carries out removing surface, and the removing surface is by greasy dirt, the oxide in the groove face and its edge 50mm
And corrosion is removed completely.
4. the welding procedure of straight seam welded pipe according to claim 3, which is characterized in that the removing surface is specifically to use
Electric angle grinder by the steel plate corrosion and oxide cmp polish clean, so that the steel plate is exposed metallic luster, then use
Acetone soln removes the greasy dirt on the steel plate.
5. the welding procedure of straight seam welded pipe according to claim 1, which is characterized in that in step s 6, in the outside weld
It needs to carry out back chipping processing before cosmetic welding, the back chipping processing is specifically to remove the weld seam of first layer.
6. the welding procedure of straight seam welded pipe according to claim 1, which is characterized in that temperature when welding between adjacent layer
Degree difference control is at 200 DEG C -250 DEG C.
7. the welding procedure of straight seam welded pipe according to claim 1, which is characterized in that in step S3-S7, each step
It needs to carry out dehydrogenation immediately after the completion, the dehydrogenation is specifically the rear heat carried out at 250 DEG C -300 DEG C 30 minutes, so
After keep the temperature slow cooling.
8. the welding procedure of straight seam welded pipe described in any one of -7 according to claim 1, which is characterized in that completed in step S7
Afterwards, need to be to the tool there are five the progress post weld heat treatment of the straight seam welded pipe of layer, the post weld heat treatment is described will have five
The straight seam welded pipe of a layer is placed at 640 DEG C -660 DEG C and keeps the temperature 1 hour.
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| CN111408909A (en) * | 2020-05-08 | 2020-07-14 | 安徽伟宏钢结构集团股份有限公司 | Production welding process for forged steel parts |
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Effective date of registration: 20200324 Address after: 225000 Jiangsu Province, Yangzhou City Jiangyang Industrial Park Patentee after: JIANGSU TONGYU STEEL PIPE GROUP Co.,Ltd. Address before: 225008 No. 718 Jiangbei Road, Yangzhou, Jiangsu Patentee before: YANGZHOU TONGYU PRESSURE VESSEL Co.,Ltd. |