CN108994430A - The welding method of Nickel-Based Steel and carbon steel dissimilar material pipeline - Google Patents
The welding method of Nickel-Based Steel and carbon steel dissimilar material pipeline Download PDFInfo
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Abstract
The invention belongs to different steel weld technical fields, and in particular to the welding method of Nickel-Based Steel and carbon steel dissimilar material pipeline.When in order to solve Nickel-Based Steel and carbon steel the progress tube group butt welding to small diameter tube, big tube wall, back of weld there is a problem of being higher than 0.45mm protrusion, and the invention proposes the welding methods of a kind of Nickel-Based Steel and carbon steel dissimilar material pipeline.The welding method carries out the group pair between pipeline to be welded the following steps are included: step S1, and group controls in 0~1mm, and at the back side of the group to groove gap and is filled with protective gas；The bottom welding between pipeline is grouped in step S2；The filling welding between pipeline is grouped in step S3；The cover welding between pipeline is grouped in step S4.In the method for the invention, by using segmented fusion weld to bottom welding, and welding parameters are adaptively adjusted, so that the distribution of heat input in bottom welding is controlled, by the control of back of weld protrusion within 0.45mm.
Description
Technical field
The invention belongs to different steel weld technical fields, and in particular to the weldering of Nickel-Based Steel and carbon steel dissimilar material pipeline
Connect method.
Background technique
High temperature gas cooled reactor is a kind of forth generation nuclear power heap-type with good security feature.Heat-transfer pipe is that high temperature gas cooled reactor is steamed
The key components of vapour generator play a part of carrying fluid and directly exchange heat, it is to entire high temperature gas cooled reactor
Performance and securely and reliably there is great influence.
Currently, using the Incoloy 800H Nickel-Based Steel that outer diameter is 3mm for 19mm, wall thickness in heat-transfer pipe
When being welded with T22 carbon steel dissimilar material pipeline, since the welding performance of Incoloy 800H Nickel-Based Steel itself is original
With regard to poor, and be for small diameter tube, big tube wall dissimilar material pipeline welding is grouped, easily occur after the completion of welding
Weld seam inner surface is higher than the raised phenomenon of 0.45mm, is unable to satisfy the standard requirements that inner wall protrusion is no more than inner surface 0.45mm,
And then the quality and performance of heat-transfer pipe welding point are affected, it not can guarantee going on smoothly for entire construction speed.
Summary of the invention
In order to solve Incoloy800H Nickel-Based Steel and T22 carbon steel the progress pipeline group butt welding to small diameter tube, big tube wall
When connecing, there is a problem of being higher than 0.45mm protrusion in soldered back of weld, the invention proposes a kind of Nickel-Based Steels
With the welding method of carbon steel dissimilar material pipeline.The welding method the following steps are included:
Step S1 carries out the group pair between pipeline to be welded, group controls in 0~1mm gap, and in group to groove
The back side be filled with protective gas；
The bottom welding between pipeline is grouped in step S2；Segmentation fusion weld along the circumferential direction is carried out to root face
It connects to form penetration bead, and is gradually reduced welding current during entire fusion weld；
The filling welding between pipeline is grouped in step S3；After completing bottom welding, filled out on backing run
Welding is filled, until completing the filling welding in whole circumference；
The cover welding between pipeline is grouped in step S4；After completing filling welding, one or multi-channel capping is carried out
Welding forms final pass, until completing entire welding operation.
Preferably, in the step S1, the groove of single V-type, and the unilateral slope of the groove are used between pipeline to be welded
Degree is 15 °~25 °.
Preferably, in the step S1, the group of pipeline to be welded is completed to rear, in group to multiple points are arranged between gap
The fixation of position between pipeline is grouped in solid point.
It is further preferred that in the step S1, dividing 3 solid points are arranged between gap in group the group of pipeline
It Wei Yu not be at 0 °, 135 ° and 225 ° position of banjo fixing butt jointing.
Preferably, in the step S2, point four sections of progress fusion welds, respectively be 0 ° in banjo fixing butt jointing~
90 ° of sections, 90 °~180 ° sections, 180 °~270 ° sections and 270 °~0 ° section；Wherein,
Fusion weld between 0 °~90 °, the peak ranges of welding current are 95~115A, base value range is 42~62A,
Time to peak is 0.20~0.26s, and the base value time is 0.36~0.42s；Fusion weld between 90 °~180 °, welding current
Peak ranges be 88~108A, base value range is 39~59A, time to peak is 0.20~0.26s, the base value time is 0.36~
0.42s；Fusion weld between 180 °~270 °, the peak ranges of welding current are 83~103A, base value range be 36~
56A, time to peak are 0.20~0.26s, and the base value time is 0.36~0.42s；Fusion weld between 270 °~0 °, welding electricity
The peak ranges of stream are 82~102A, base value range is 36~56A, and time to peak is 0.20~0.26s, and the base value time is 0.36
~0.42s.
It is further preferred that peak value and base value to welding current carry out adjoint during dividing four sections of fusion weld
Property it is sectional-regulated when, every section adjust after, welding current value reduce by 1~5A.
Preferably, in the step S3, it is welded using subsection filling, and gradually subtracted in entirely filling welding process
Small welding current.
It is further preferred that in the step S3, dividing four sections and being filled welding, respectively be in banjo fixing butt jointing
45 °~135 ° sections, 135 °~225 ° sections, 225 °~315 ° sections and 315 °~45 ° sections；Wherein,
Filling welding between 45 °~135 °, the peak ranges of welding current are 86~106A, base value range be 33~
53A, voltage range are 9.0~10.0V, and speed of welding is 63~67mm/min, and wire feed rate is 325~335mm/min；135°
Filling welding between~225 °, the peak ranges of welding current are 82~102A, base value range is 28~48A, voltage range
For 8.7~9.7V, speed of welding is 63~67mm/min, and wire feed rate is 325~335mm/min；Between 225 °~315 °
Filling welding, the peak ranges of welding current are 79~99A, base value range is 28~48A, and voltage range is 8.5~9.5V, weldering
Connecing speed is 63~67mm/min, and wire feed rate is 325~335mm/min；Filling welding between 315 °~45 °, welding electricity
The peak ranges of stream are 76~96A, base value range is 26~46A, and voltage range is 8.5~9.5V, speed of welding is 63~
67mm/min, wire feed rate are 325~335mm/min.
Preferably, in the step S4, using segmentation cover welding, and gradually subtract during entire cover welding
Small welding current.
It is further preferred that in the step S4, point four sections of progress cover weldings respectively are in banjo fixing butt jointing
315 °~45 ° sections, 45 °~135 ° sections, 135 °~225 ° sections and 225 °~315 ° sections；Wherein,
Cover welding between 315 °~45 °, the peak ranges of welding current are 88~108A, base value range be 35~
55A, voltage range are 8.6~9.7V, and speed of welding is 63~67mm/min, and wire feed rate is 315~325mm/min；45 °~
Cover welding between 135 °, the peak ranges of welding current are 85~105A, base value range is 32~52A, and voltage range is
8.5~9.5V, speed of welding are 63~67mm/min, and wire feed rate is 315~325mm/min；Lid between 135 °~225 °
Face welding, the peak ranges of welding current are 83~103A, base value range is 33~53A, and voltage range is 8.5~9.5V, weldering
Connecing speed is 63~67mm/min, and wire feed rate is 315~325mm/min；Cover welding between 225 °~315 °, welding electricity
The peak ranges of stream are 82~102A, base value range is 30~50A, and voltage range is 8.7~9.7V, speed of welding is 63~
67mm/min, wire feed rate are 315~325mm/min.
Using the welding method of Nickel-Based Steel of the present invention and carbon steel dissimilar material pipeline, outer diameter 19mm, wall thickness
When welding is grouped for the Incoloy 800H Nickel-Based Steel and T22 carbon steel dissimilar material pipeline of 3mm, have beneficial below
Effect:
1, when using method of the invention, segmentation fusion weld is carried out by the bottom welding to whole circumference direction, and
And as the carry out welding parameters of welding are adaptively adjusted, to control heat input in entire bottom welding process
Distribution makes the Welding Molten Drop generated in welding process reach the balance of suffered gravity and suffered root face support force, thus
Weld seam is effectively controlled in the case that group is to weldquality between guarantee small diameter tube, big wall thickness nickel-base alloy steel conduit and carbon steel piping
Back side projection amount, so that it is met the standard requirements that height of projection is lower than 4.5mm, and then meet the quality of heat-transfer pipe welding point
And performance requirement, guarantee going on smoothly for entire construction speed.
2, segmentation in the method for the invention, is respectively adopted by filling welding to whole circumference direction and cover welding
Formula welding, and welding parameter and the corresponding adjustment control of welding starting the arc position progress to different zones, are precisely controlled and fill out
Welding and cover welding are filled in the process to the function and effect of backing run, avoid that backing run is generated excess force that and formed
The invagination of weld seam, to be further ensured that the quality of final weld seam.
Detailed description of the invention
Fig. 1 is to carry out group to Incoloy 800H nickel-base alloy steel conduit and T22 carbon steel piping using method of the invention
To the flow diagram of welding；
The structural schematic diagram of Fig. 2 group pair between pipeline to be welded in the method for the invention；
Fig. 3 is to put solid point in the method for the invention in group to the distribution schematic diagram in gap；
Fig. 4 is welding sequence schematic diagram when carrying out segmentation bottom welding in the method for the invention；
Fig. 5 is welding sequence schematic diagram when carrying out subsection filling welding in the method for the invention；
Fig. 6 is welding sequence schematic diagram when carrying out segmentation cover welding in the method for the invention.
Specific embodiment
It describes in detail with reference to the accompanying drawing to technical solution of the present invention
As shown in connection with fig. 1, using the welding method of Nickel-Based Steel of the present invention and carbon steel dissimilar material pipeline, to outer diameter ruler
Very little is 19mm, wall thickness 3mm, root face with a thickness of the Incoloy800H nickel-base alloy steel conduit and T22 carbon steel pipe of 0.5mm
When welding is grouped in road, concrete operation step are as follows:
Step S1 carries out the group pair between pipeline to be welded, group controls in 0~1mm gap, and in group to groove
The back side be filled with protective gas.
As shown in connection with fig. 2, by Incoloy800H nickel-base alloy steel conduit and opposite group of T22 carbon steel piping to the single V-type of formation
Groove, wherein the unilateral gradient of groove is 20 °, and the group in whole circumference direction controls in 0~1mm gap.
Preferably, in the group for completing Incoloy800H nickel-base alloy steel conduit and T22 carbon steel piping to rear, between group pair
Multiple solid points can also be set between gap, between Incoloy800H nickel-base alloy steel conduit and T22 carbon steel piping
Positional relationship is fixed, so that stability of the guarantee group to gap, guarantees the quality and effect of later period welding.
As shown in connection with fig. 3, it sets along circumferencial direction of the group to gap there are three solid point is put, is respectively located at 0 ° of banjo fixing butt jointing
First solid point 1, the second point solid point 2 at 135 ° of banjo fixing butt jointing and the third solid point at 225 ° of pipeline to be welded
Point 3.It is arranged symmetrically by carrying out three solid points in whole circumference, to guarantee that treating welded pipe line progress spot welding fixes
When active force be uniformly distributed, the stability that welded pipe line is fixedly connected is treated in guarantee.It equally, can also be according to pipeline to be welded
Diameter dimension, group to gap size and groove size, greater number of solid point is set in other positions, is guaranteed to be welded
The fixed stability in adapter tube road.
In addition, can both use volume ratio for the argon helium gas mixture of 3:7 as group to the backing gas of groove, into
The protection at the groove back side in row welding process equally can also select pure argon according to construction site situation and welding requirements
As backing gas.
The bottom welding between pipeline is grouped in step S2.Segmentation fusion weld is carried out to root face and forms penetration
Welding bead, and it is gradually reduced welding current during entire fusion weld, it efficiently controls hot in entire bottom welding process
The distribution situation of input quantity controls the size of back of weld protrusion to balance gravity suffered by molten bath and support force.
Preferably, bottoming fusion weld is carried out using segmented.As shown in connection with fig. 4, by group to gap along the circumferential direction according to
It is secondary to be divided into 0 °~90 ° sections, 90 °~180 ° sections, 180 °~270 ° sections and 270 °~0 ° section, and by the stripe sequence successively into
The bottom welding in whole circumference is completed in row welding.
Wherein, in the fusion weld between 0 °~90 °, the peak ranges of welding current are 95~115A, base value range
For 42~62A, time to peak is 0.20~0.26s, and the base value time is 0.36~0.42s.Fusion weld between 90 °~180 °
In connecing, the peak ranges of welding current are 88~108A, base value range is 39~59A, and time to peak is 0.20~0.26s, base
The value time is 0.36~0.42s.In fusion weld between 180 °~270 °, the peak ranges of welding current are 83~
103A, base value range are 36~56A, and time to peak is 0.20~0.26s, and the base value time is 0.36~0.42s.At 270 °~0 °
Between fusion weld in, the peak ranges of welding current are 82~102A, base value range is 36~56A, and time to peak is
0.20~0.26s, base value time are 0.36~0.42s.
It is further preferred that peak value and base value to welding current carry out during dividing above-mentioned four sections of fusion weld
With property it is sectional-regulated when, every section adjust after, welding current value reduce by 1~5A, thus to every section welding in heat input into
The best reasonable distribution of row, to guarantee the Forming Quality of weld seam on whole circumference direction.Equally, for other diameter dimensions and wall
When welding is grouped in the Nickel-Based Steel and carbon steel of thick size, the quantity of segmented welding can also be adjusted as the case may be,
And between the current value and different sections of different welding positions current value size relation, different size pipelines are welded to reach
The best appearance of weld effect connect.
The filling welding between pipeline is grouped in step S3.After completing the bottom welding in step S2, in backing welding
Welding is filled on road, until completing the filling welding on whole circumference direction.
Preferably, welding is filled using segmented, and is gradually reduced welding electricity in entirely filling welding process
Stream.As shown in connection with fig. 5, group is along the circumferential direction in turn divided into gap 45 °~135 ° sections, 135 °~225 ° sections, 225 °~
315 ° of sections and 315 °~45 ° sections, and successively carry out the filling that welding is completed in whole circumference by the stripe sequence and weld.
Wherein, in the filling welding between 45 °~135 °, the peak ranges of welding current are 86~106A, base value model
It encloses for 33~53A, voltage range is 9.0~10.0V, and speed of welding is 63~67mm/min, and wire feed rate is 325~335mm/
min.In filling welding between 135 °~225 °, the peak ranges of welding current are 82~102A, base value range be 28~
48A, voltage range are 8.7~9.7V, and speed of welding is 63~67mm/min, and wire feed rate is 325~335mm/min.?
In filling welding between 225 °~315 °, the peak ranges of welding current are 79~99A, base value range is 28~48A, voltage
Range is 8.5~9.5V, and speed of welding is 63~67mm/min, and wire feed rate is 325~335mm/min.315 °~45 ° it
Between filling welding in, the peak ranges of welding current are 76~96A, base value range is 26~46A, voltage range is 8.5~
9.5V, speed of welding are 63~67mm/min, and wire feed rate is 325~335mm/min.
The cover welding between pipeline is grouped in step S4.After completing above-mentioned filling welding, carry out one or multi-channel
Cover welding forms final pass, until completing entire welding operation.
Preferably, cover welding is carried out using segmented, and is gradually reduced welding electricity during entire cover welding
Stream.As shown in connection with fig. 6, group is along the circumferential direction in turn divided into gap 315 °~45 ° sections, 45 °~135 ° sections, 135 °~
225 ° of sections and 225 °~315 ° sections, and successively carry out welding the cover welding completed in whole circumference by the stripe sequence.
Wherein, in the cover welding between 315 °~45 °, the peak ranges of welding current are 88~108A, base value model
It encloses for 35~55A, voltage range is 8.6~9.7V, and speed of welding is 63~67mm/min, and wire feed rate is 315~325mm/
min.In cover welding between 45 °~135 °, the peak ranges of welding current are 85~105A, base value range be 32~
52A, voltage range are 8.5~9.5V, and speed of welding is 63~67mm/min, and wire feed rate is 315~325mm/min.?
In cover welding between 135 °~225 °, the peak ranges of welding current are 83~103A, base value range is 33~53A, electricity
Pressure range is 8.5~9.5V, and speed of welding is 63~67mm/min, and wire feed rate is 315~325mm/min.225 °~
In cover welding between 315 °, the peak ranges of welding current are 82~102A, base value range is 30~50A, voltage range
For 8.7~9.7V, speed of welding is 63~67mm/min, and wire feed rate is 315~325mm/min.
Further effect comparison is done to technical solution of the present invention below with reference to embodiment and comparative example
Embodiment one
Firstly, outer diameter 19mm, wall thickness 3mm, root face are to the position 2G is located at a thickness of 0.5mm's
Incoloy800H nickel-base alloy steel conduit and T22 carbon steel piping carry out the double V-groove that the unilateral gradient is 20 ° and process, and to two
Segment pipe is grouped, and the group of circumferencial direction controls between 0~1mm gap.Then, in group to three are arranged between gap
A solid point carries out position to pipeline to group and fixes, and three solid points are located at 0 °, 135 ° and 225 ° three of circumferencial direction
Position, at the same the back side of the group to groove be filled with volume ratio be 3:7 argon helium gas mixture as backing gas.Then, it adopts
The welding parameter shown in table 1 successively carries out bottom welding, filling welding and cover welding to group to pipeline.Wherein, France is selected
The PS406 all-position automatic welder of Polysoude company, head configure closed head and two kinds of caliper brake, are respectively used to beat
Back welding connects and fills cover welding, and tungsten electrode is using polishing cerium tungsten electrode, and the diameter of tungsten electrode is 2.0mm, taper is 30 °, platform is straight
Diameter is 0~0.8mm, and welding wire selects ERNiCr-3 welding wire, and gage of wire is 0.8mm, and welding protective gas selection purity is
99.99% argon gas.
Table 1
After completing all welding, detection test is carried out to the welding point obtained in embodiment one.Wherein, weld seam just
The defects of crackle, stomata, undercut, incomplete fusion and slag inclusion is not present in face and the back side, flawless and slag inclusion are gentle inside weld seam
The excessive defects such as hole, and meet mechanical property requirements.Meanwhile leading to ball using outer diameter for 12.1mm and carrying out through ball test,
Back commissure can be passed through by testing logical ball, to meet the standard requirements for being lower than 0.45mm to back of weld protrusion.
Embodiment two
Use the method that is the same as example 1 to outer diameter having a size of 19mm, wall thickness 3mm, root face with a thickness of
Welding is grouped in the Incoloy800H nickel-base alloy steel conduit and T22 carbon steel piping of 0.5mm, and difference is: adapter tube to be welded
Road is in the position 5G, and using the difference of welding parameter shown in table 2 bottom welding, filling welding and cover welding.
Table 2
After completing all welding, detection test is carried out to the welding point obtained in embodiment two.Wherein, weld seam just
The defects of crackle, stomata, undercut, incomplete fusion and slag inclusion is not present in face and the back side, flawless and slag inclusion are gentle inside weld seam
The excessive defects such as hole, and meet mechanical property requirements.Meanwhile leading to ball using outer diameter for 12.1mm and carrying out through ball test,
Back commissure can be passed through by testing logical ball, to meet the standard requirements for being lower than 0.45mm to back of weld protrusion.
Comparative example one
Use method identical with embodiment two to outer diameter having a size of 19mm, wall thickness 3mm, root face with a thickness of
Welding is grouped in the Incoloy800H nickel-base alloy steel conduit and T22 carbon steel piping of 0.5mm, and difference is only that: using table
Welding parameter shown in 3 carries out bottom welding, filling welding and cover welding respectively.
Table 3
After completing all welding, the welding point obtained in comparative example one is detected.Although being using outer diameter
12.1mm leads to ball and carries out through ball test, and testing logical ball can be quickly through back commissure, still, due in entire bottom welding
In, the peak current value of 0 °~90 ° sections is lower than 42A lower than 95A, background current value, and the peak current value of 90 °~180 ° of sections is lower than
88A, background current value are lower than 39A, and the peak current value of 180 °~270 ° sections is lower than 83A, background current value is lower than 36A, and 270 °
The peak current value of~0 ° of section is lower than 36A lower than 82A, background current value, in this way can not be complete during the fusion weld of bottoming
Complete to realize that local incomplete fusion phenomenon occurs in fusion weld, in back of weld, there are incomplete fusion defects.
Comparative example two
Use method identical with embodiment two to outer diameter having a size of 19mm, wall thickness 3mm, root face with a thickness of
Welding is grouped in the Incoloy800H nickel-base alloy steel conduit and T22 carbon steel piping of 0.5mm, and difference is only that: using table
Welding parameter shown in 4 carries out bottom welding, filling welding and cover welding respectively.
Table 4
After completing all welding, observation detection is carried out to the welding point obtained in comparative example two.Although the front of weld seam
The defects of crackle, stomata, undercut, incomplete fusion and slag inclusion are not present with the back side, weld seam inside flawless and slag inclusion and stomata etc.
Excessive defect, and meet mechanical property requirements.But due in entire bottom welding, the peak current value of 0 °~90 ° sections
It is higher than 62A higher than 115A, background current value, the peak current value of 90 °~180 ° sections is higher than 108A, background current value is higher than 59A,
The peak current value of 180 °~270 ° sections is higher than 103A, background current value is higher than 56A, and the peak current value of 270 °~0 ° of section is higher than
102A, background current value are higher than 56A, form large-sized protrusion so as to cause back of weld, outer diameter is logical for 12.1mm
Ball can not be higher than 0.45mm, be unsatisfactory for standard requirements by back commissure, i.e. back of weld protrusion.
Claims (10)
1. the welding method of a kind of Nickel-Based Steel and carbon steel dissimilar material pipeline, which is characterized in that the welding method include with
Lower step:
Step S1 carries out the group pair between pipeline to be welded, group controls in 0~1mm gap, and in group to the back of groove
Face is filled with protective gas；
The bottom welding between pipeline is grouped in step S2；Segmentation fusion weld shape along the circumferential direction is carried out to root face
Welding current is gradually reduced at penetration bead, and during entire fusion weld；
The filling welding between pipeline is grouped in step S3；After completing bottom welding, weldering is filled on backing run
It connects, until completing the filling welding in whole circumference；
The cover welding between pipeline is grouped in step S4；After completing filling welding, one or multi-channel cover welding is carried out
Final pass is formed, until completing entire welding operation.
2. welding method according to claim 1, which is characterized in that in the step S1, adopted between pipeline to be welded
With the groove of single V-type, and the unilateral gradient of the groove is 15 °~25 °.
3. welding method according to claim 1, which is characterized in that in the step S1, complete pipeline to be welded
In group to multiple solid points are arranged between gap, the fixation of position between pipeline is grouped to rear in group.
4. welding method according to claim 3, which is characterized in that in the step S1, in group to the group pair of pipeline
3 solid points are set between gap, are located at 0 °, 135 ° and 225 ° position of banjo fixing butt jointing.
5. welding method according to claim 1, which is characterized in that in the step S2, point four sections of progress fusion welds
It connects, 0 °~90 ° sections, 90 °~180 ° sections, 180 °~270 ° sections and 270 °~0 ° section respectively being in banjo fixing butt jointing；Wherein,
Fusion weld between 0 °~90 °, the peak ranges of welding current are 95~115A, base value range is 42~62A, peak value
Time is 0.20~0.26s, and the base value time is 0.36~0.42s；Fusion weld between 90 °~180 °, the peak of welding current
Value range is 88~108A, base value range is 39~59A, and time to peak is 0.20~0.26s, the base value time is 0.36~
0.42s；Fusion weld between 180 °~270 °, the peak ranges of welding current are 83~103A, base value range be 36~
56A, time to peak are 0.20~0.26s, and the base value time is 0.36~0.42s；Fusion weld between 270 °~0 °, welding electricity
The peak ranges of stream are 82~102A, base value range is 36~56A, and time to peak is 0.20~0.26s, and the base value time is 0.36
~0.42s.
6. welding method according to claim 5, which is characterized in that during dividing four sections of fusion weld, to welding
When the peak value and base value of electric current carry out sectional-regulated with property, after every section is adjusted, welding current value reduces by 1~5A.
7. welding method according to claim 1, which is characterized in that in the step S3, welded using subsection filling,
And welding current is gradually reduced in entirely filling welding process.
8. welding method according to claim 7, which is characterized in that in the step S3, divide four sections and be filled weldering
It connects, 45 °~135 ° sections, 135 °~225 ° sections, 225 °~315 ° sections and 315 °~45 ° sections respectively being in banjo fixing butt jointing；
Wherein,
Filling welding between 45 °~135 °, the peak ranges of welding current are 86~106A, base value range is 33~53A, electricity
Pressure range is 9.0~10.0V, and speed of welding is 63~67mm/min, and wire feed rate is 325~335mm/min；135 °~225 °
Between filling welding, the peak ranges of welding current are 82~102A, base value range is 28~48A, voltage range is 8.7~
9.7V, speed of welding are 63~67mm/min, and wire feed rate is 325~335mm/min；Filling weldering between 225 °~315 °
It connects, the peak ranges of welding current are 79~99A, base value range is 28~48A, and voltage range is 8.5~9.5V, speed of welding
For 63~67mm/min, wire feed rate is 325~335mm/min；Filling welding between 315 °~45 °, the peak of welding current
Value range is 76~96A, base value range is 26~46A, and voltage range is 8.5~9.5V, and speed of welding is 63~67mm/min,
Wire feed rate is 325~335mm/min.
9. welding method according to claim 1, which is characterized in that in the step S4, using segmentation cover welding,
And welding current is gradually reduced during entire cover welding.
10. welding method according to claim 9, which is characterized in that in the step S4, point four sections of progress cosmetic weldings
It connects, 315 °~45 ° sections, 45 °~135 ° sections, 135 °~225 ° sections and 225 °~315 ° sections respectively being in banjo fixing butt jointing；
Wherein,
Cover welding between 315 °~45 °, the peak ranges of welding current are 88~108A, base value range is 35~55A, electricity
Pressure range is 8.6~9.7V, and speed of welding is 63~67mm/min, and wire feed rate is 315~325mm/min；45 °~135 ° it
Between cover welding, the peak ranges of welding current are 85~105A, base value range is 32~52A, voltage range is 8.5~
9.5V, speed of welding are 63~67mm/min, and wire feed rate is 315~325mm/min；Cosmetic welding between 135 °~225 °
It connects, the peak ranges of welding current are 83~103A, base value range is 33~53A, and voltage range is 8.5~9.5V, welding speed
Degree is 63~67mm/min, and wire feed rate is 315~325mm/min；Cover welding between 225 °~315 °, welding current
Peak ranges are 82~102A, base value range is 30~50A, and voltage range is 8.7~9.7V, and speed of welding is 63~67mm/
Min, wire feed rate are 315~325mm/min.
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