CN105880815B - A kind of tube sheet corner joint auxiliary welding device and welding method - Google Patents

A kind of tube sheet corner joint auxiliary welding device and welding method Download PDF

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Publication number
CN105880815B
CN105880815B CN201610424192.8A CN201610424192A CN105880815B CN 105880815 B CN105880815 B CN 105880815B CN 201610424192 A CN201610424192 A CN 201610424192A CN 105880815 B CN105880815 B CN 105880815B
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welding
metal
metal plate
tube
tube sheet
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CN105880815A (en
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尉法兵
黄志�
刘颖
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Rail Track Vehicle Co Ltd
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Rail Track Vehicle Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/32Accessories
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/02Seam welding; Backing means; Inserts
    • B23K9/028Seam welding; Backing means; Inserts for curved planar seams
    • B23K9/0288Seam welding; Backing means; Inserts for curved planar seams for welding of tubes to tube plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/173Arc welding or cutting making use of shielding gas and of a consumable electrode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment

Abstract

The invention discloses a kind of tube sheet corner joint auxiliary welding device and welding methods.The auxiliary welding device includes metal plate and metal tube, process bar;The hole passed through for metal tube end is provided on the metal plate, the side wall in the hole is K-type groove;The end of the metal tube passes through the hole on metal plate, and the end face of metal tube and the front of metal plate are coplanar;The process bar is fixed on the front of metal plate, and contacts with the end face of metal tube;There is gap between the outer wall of the metal tube and the hole wall of metal plate.First inside is welded to 2/3-the 4/5 of groove depth to the welding method, then turn-over welds outer side weld to completely filling out, and finally completes remaining inside welding.The present invention can control the welding deformation of tube sheet, possess good weld appearance and internal soundness, to be suitable for the welding of the fields similar parts such as similar rail traffic.

Description

A kind of tube sheet corner joint auxiliary welding device and welding method
Technical field
The present invention relates to a kind of tube sheet corner joint auxiliary welding device and welding methods, belong to Tube-sheet Welding technology neck Domain.
Background technique
For the middle thick sheet metal welding with a thickness of 10mm -25mm, either banjo fixing butt jointing or T connector, mostly use K-type groove welding, to achieve the purpose that welding by both sides double-faced forming, especially the K-type weld seam of tube sheet docking is by using tooling or pressure The mode that metal plate compresses can be easier to reduce its deformation, and welding manner has submerged-arc welding, MAG weldering (consumable electrode active gases Protection weldering) etc. a variety of welding methods, but the K-type groove welding method of tube sheet corner connection is not related to also.
The difficult point of the K-type weld seam of tube sheet corner connection is welding deformation and internal flaw, particularly with having verticality and plane Desired components are spent, welding deformation should be more controlled.The main reason for causing welding deformation is the heat input in welding process Unevenly cause welding residual stress.Influence welding residual stress and distortion because being known as two o'clock:
First is that the range and degree of weld seam and its surrounding non-uniform heat flux, that is, generate the range and degree of thermal deformation;
Second is that the rigidity of weldment itself and the degree restrained by surrounding, i.e. prevention weld seam and its surrounding heat produced heat The degree of deformation.
Since such weld seam is critical welding seams, postwelding needs to carry out magnetic powder inspection and ultrasonic examination, is easy in discovery The defects of stomata, crackle, slag inclusion, position fusion, is contained in portion, makes troubles to reprocessing, influences welding part quality stability, this The main reason for a little defects generate has:Weld preheating temperature is improper, and polishing cleaning is not clean before welding, and interlayer temperature controls not It is enough, welding parameter is improper etc..
Chinese patent application CN102513713A discloses a kind of stainless steel clad metal plate pressing pressure container casing and inserts Enter the welding method that formula stainless steel connects metal tube comprising following steps:
A), the metal pore that stainless steel connects metal tube is opened up on stainless steel clad metal plate pressing pressure container casing, it will Metal tube hole wall is processed into a groove of K-type or single V-type;
B), formed secondary on a groove face with the certain thickness transition separation layer of high chromium nickel stainless steel welding rod built-up welding Groove;
C), the stainless steel clad metal plate pressing pressure container casing of heap postwelding is subjected to hidden lino removal;
D), connect according to the stainless steel electrode soldering stainless steel of the material same material of the stainless steel cladding on clad metal sheet The corner joint of metal tube and stainless steel clad metal sheetpile interpass.Since elder generation is the one of stainless steel clad metal plate base side With the certain thickness transition separation layer of high chromium-nickel electrode built-up welding on secondary groove, corner joint then is welded with stainless steel electrode, it will Carbon steel or low alloy steel ingredient transition is stainless composition of steel, and the ascending transition of plastic property of weld bead avoids the generation of crackle, makes Use reliable performance.
However this kind welding connects the welding between metal tube just for dissimilar steel or Stainless Steel Shell and stainless steel, simultaneously Will also in the K-type or double V-groove that Stainless Steel Shell opens up built-up welding transition deposition separation layer, then carry out the welding of tube sheet, due to Transition zone is increased, Stress non-homogeneity is caused, is easy to produce crackle, it is necessary to which welding residual stress, technique are eliminated by heat treatment Difficulty of construction is larger, it is often more important that can not thoroughly eradicate the hidden danger that dissimilar material welding cracks, be only applicable to metal plate Thick relatively thin shell and the welding for connecing metal tube, Tube-sheet Welding and discomfort to the middle thick sheet metal carbon steel material of 10-25mm With.
Summary of the invention
To realize the K-type groove welding of tube sheet corner connection, and there is good weld appearance effect (emphasis guarantee metal pipe With the verticality of metal plate and the flatness of metal pipe end and metal plank) and internal soundness (flawless, stomata, slag inclusion, Lack of penetration, incomplete fusion), the present invention is intended to provide a kind of tube sheet corner joint auxiliary welding device and welding method, the welding side Method first have to solve the problems, such as be thick sheet metal thickness in how controlling tube sheet corner joint K-type groove welding deformation, thus It can control welding deformation, possess good weld appearance and internal soundness, to be suitable for the fields such as similar rail traffic similar to zero The welding of component.It further to solve the problems, such as to be turn-over number when how to reduce welding, and then reduce labor intensity, improve Working efficiency.
To achieve the goals above, the technical scheme adopted by the invention is that:
A kind of tube sheet corner joint auxiliary welding device, including metal plate and metal tube, are structurally characterized in that, further include work Skill muscle;The hole passed through for metal tube end is provided on the metal plate, the side wall in the hole is K-type groove;The metal tube End passes through the hole on metal plate, and the end face of metal tube and the front of metal plate are coplanar;The process bar is fixed on metal plate Front, and contacted with the end face of metal tube;There is gap between the outer wall of the metal tube and the hole wall of metal plate.
Auxiliary welding device of the invention can make the corner connection welding quality of middle thick sheet metal and metal tube be under control, Weld seam has reached EN 15085 through magnetic powder inspection and ultrasonic examination《The welding of rail vehicle and its component》Middle CPB grades of weld seam matter Amount requires, and welding deformation has obtained good control.
The end face of metal tube of the present invention and the front of metal plate it is coplanar refer to visually appearing as a plane, gold It is approximate with metal plate in the same plane to belong to end surfaces, avoids the processes such as correction, improves work efficiency.
According to an embodiment of the invention, can also make further optimization to the present invention, the following are the skills formed after optimization Art scheme:
Preferably, the metal tube is metal circular tube, opens circular hole on metal plate;It is preferred that the circle of metal pipe outer wall and metal plate Annular gap between the inner wall of hole is 2mm-3mm;It is preferred that K-type groove is the symmetrical groove of cyclic annular K-type.
Preferably, the process bar has two;The length of selection process muscle is greater than the maximum radial dimension of metal plate hole extremely Few 100mm;The length of more preferable process bar is greater than the maximum radial dimension 100mm-150mm of metal plate hole.
In the present invention, the hickness of metal plate t1 is 10mm-25mm, and metal tube wall thickness t2 is 10mm -50mm.
Preferably, the front and back sides bevel angle α of the K-type groove is 45 ° -50 °.
In order to facilitate segmented welding, the root of the K-type groove has root face;It is preferred that the length c of the root face is 1mm- 2mm。
A kind of tube sheet corner connection connector welding method comprising following steps:
S1, on a metal plate aperture, and K-type groove is processed on the inner wall of hole;
S2, the front of metal plate is paved by process bar, and fixed metal plate and process bar;
S3, the hole that metal tube is passed through to metal plate, are equipped with gap, and guarantee metal between metal pipe outer wall and hole inner wall The front of end surfaces and metal plate is coplanar;
S4, technique for fixing muscle and metal tube, spot welding is more at the double V-groove for the exterior portion that metal tube is contacted with metal plate Section backing weld seam, and the double V-groove and periphery base material of inboard portion that preheated metallic pipe is contacted with metal plate;It is preferred that backing welding Seam is three sections, and every segment length is 15mm -20mm;
S5, the hole inside K-type groove root pass bottom welding to metal plate, after making root pass penetration, part weld seam The double V-groove for the exterior portion that metal penetration metal tube is contacted with metal plate completes bottom welding;
After S6, bottom welding, the oxide skin on trimming surface, then it is filled the welding of layer, it is welded to K-type groove depth At least half when, turn-over removes process bar, and carries out back chipping to the outside double V-groove root of K-type groove;
After the completion of S7, back chipping, weld seam at the outside double V-groove of K-type groove and periphery are preheated, then carry out outside it is more Layer multi-pass welding finally completes the welding of K-type groove remaining inside depth until outer side weld completely fills out.
The welding deformation be curved to the inside can be generated when weld joint on inner side welds as a result, outside can generate outward when welding Curved welding deformation, the two are cancelled out each other, to control welding deformation, possess good weld appearance and internal soundness.
The K-type groove is annular shape;It is preferred that the front and back sides bevel angle α of K-type groove is 45 ° -50 °.
In step S6, when being welded to 2/3-the 4/5 of K-type groove depth, turn-over removes process bar, in step S7, K-type groove Remaining inside depth is 1/5-the 1/3 of K-type groove depth.
Welding manner is MAG weldering, and protection gas is containing CO2Rich argon protect gas;It is preferred that Ar and CO2The ratio between volume fraction be (80% -90%):(10% -20%);It is preferred that the welding wire of MAG weldering is solid welding wire, diameter is 1.2mm -1.6mm, gas stream Amount is 15L/min -20L/min, welding current 180-240A, weldingvoltage 28-32V, speed of welding 250mm/ Min -350mm/min, interlayer temperature are 50-100 DEG C, step S4, in S7, and preheating temperature is 150 DEG C -200 DEG C.
The present invention welds similar tube plate structure using above-mentioned symmetrical K-type groove welding procedure, can make middle thick sheet metal with The corner connection welding quality of metal circular tube is under control, and weld seam has reached EN 15085 through magnetic powder inspection and ultrasonic examination《Rail The welding of road vehicle and its component》Middle CPB grades of weldquality requirement, welding deformation have obtained good control, round metal pipe end Portion is approximate with steel plate in the same plane, avoids the processes such as correction, improves work efficiency.
Compared with prior art, the beneficial effects of the invention are as follows:The present invention is using above method 6KJ/cm -13KJ/cm heat Soldered tube sheetbrace angle welding seam is inputted, metal circular tube end and steel plate are substantially in same plane, and deflection is small, while metal The verticality of round tube and steel plate also keeps very well, after magnetic powder inspection and ultrasonic examination detection, having no obvious shortcoming, meeting CPB grades of weldqualities requirement in EN15085, solderless post-equalization or reprocesses process, substantially increases welding efficiency.
Detailed description of the invention
Fig. 1 is the structure principle chart of one embodiment of the invention;
Fig. 2 is the top view of Fig. 1.
In figure
1- metal plate, 2- metal tube;3- process bar;The symmetrical groove of 4-K type;The root 5-;A- metal plate front.
Specific embodiment
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that in the feelings not conflicted Under condition, the feature in embodiment and embodiment in the present invention be can be combined with each other.For sake of convenience, hereinafter as occurred "upper", "lower", "left", "right" printed words only indicate consistent with the upper and lower, left and right direction of attached drawing itself, do not play limit to structure It is set for using.
A kind of tube sheet corner joint K-type groove MAG welding method, carries out according to the following steps:
1) cyclic annular K-type groove is processed using machining equipment centering thick sheet metal (metal plate 1 in Fig. 1), preferably K-type is symmetrical Groove.The front and back sides bevel angle α of the symmetrical groove of K-type is 45 °-50 °, and root is 1-2mm there are root face c;
1) metal tube, metal tube 2, preferably metal circular tube in Fig. 1, metal circular tube outer diameter are processed using machining equipment Less than 2-3mm of metal plate subring shape K-type groove internal diameter;
2) two sectional dimensions are processed using machining equipment and is greater than 50 × 50mm, length is greater than metal plate subring shape K-type slope The process bar 3 of 100-150mm of mouth;
3) 2 process bars 3 of metal plate 1 are paved, the front of process bar 3 and metal plate 1 is fixed in spot welding;
4) metal tube 2 is penetrated into metal plate 1, guarantees metal tube 2 and metal plate 1 in the same plane, guarantee metal tube 2 with The looping pit fit-up gap b of metal plate 1 is 2-3mm;
5) process bar 3 and metal tube 2 are fixed in spot welding, and spot welding is fixed process bar 3 and metal tube 2, is uniformly distributed simultaneously The cyclic annular backing welding of spot welding metal plate 1 and 2 outside of metal tube (close to single double V-groove of process bar) three sections of long 15-20mm long Seam;
6) the weld joint on inner side groove (single double V-groove far from process bar) and periphery that preheated metallic plate 1 is contacted with metal tube 2 Base material is to 150-200 DEG C;
7) K-type groove steel plate inboard root welding bead is carried out using MAG weldering (metal active gas welding) solid welding wire Bottom welding, after making root pass penetration, part weld metal through groove front, complete bottom welding;
8) after bottom welding, 50 DEG C -100 DEG C or so are down to temperature, after the oxide skin on trimming surface, splashing, then It is filled the welding of layer, when being welded to groove depth 2/3-4/5, turn-over removes process bar, and with the external side groove root of lathe Carry out back chipping;
9) after the completion of back chipping, weld seam and periphery carry out being preheated to 150-200 DEG C at external side slope mouth, then are carried out with MAG weldering Outside multi-layer multi-pass welding until outer side weld completely fills out, then is soldered into MAG the weldering of 1/5-1/3 depth of remaining inside It connects.
The working principle of the invention:
This first inside is welded to 2/3-the 4/5 of groove depth, then turn-over welds outer side weld to completely filling out, then completes The method of remaining inside welding, plays the role of following:
(1) welding deformation be curved to the inside can be generated when weld joint on inner side welds, outside can generate outside lateral bending when welding Bent welding deformation, the two are cancelled out each other;
(2) weld joint on inner side is welded to 2/3-the 4/5 of groove depth, and outer side weld bottoming, filling, cover welding are once complete Portion completes, the reason is that weld joint on inner side first welds, caused shrinkage is maximum when welding, subsequent to successively decrease by road, only outside welding bead The stress deformation generated when weld joint on inner side welding could more be offset;
(3) easy to operate in this way, by thick sheet metal and metal circular tube in the connection of homemade 2 process bars, constrain phase Welding deformation between mutually reduces welding turn-over number, reduces labor intensity, improve work efficiency, it is most important that no Welding tool setup is needed, welding deformation can be controlled well, weldquality is high, and it is similar to be suitable for the fields such as rail traffic The welding of component.
The protective gas of MAG weldering is 80% -90%Ar+10% -20%CO2(volume fraction).
Welding wire of the invention is solid welding wire, and diameter is 1.2-1.6mm, and gas flow is 15-20L/min, welding electricity Stream is 180-240A, and weldingvoltage 28-32V, speed of welding is 250-350mm/min, and interlayer temperature is 50-100 DEG C, in advance Hot temperature is 150-200 DEG C.
The present invention welds similar tube plate structure using above-mentioned symmetrical K-type groove welding procedure, can make middle thick sheet metal with The corner connection welding quality of metal circular tube is under control, and weld seam has reached EN 15085 through magnetic powder inspection and ultrasonic examination《Rail The welding of road vehicle and its component》Middle CPB grades of weldquality requirement, welding deformation have obtained good control, round metal pipe end Portion is approximate with steel plate in the same plane, avoids the processes such as correction, improves work efficiency.
In the present invention, metal tube 2 is preferably metal circular tube, t1 in Fig. 1:10-25mm, t2:10-50mm, t3 are section Size is greater than 50 × 50mm, and length is greater than 100-150mm of Circularhole diameter of metal plate 1.
The present invention is discussed in detail with an example below:
Using solid welding wire, rich argon protective gas (80%Ar+20%CO2), select one piece of 400mm (steel plate longitudinal) × The Q345D low alloy high strength steel plate of 220mm (steel plate is lateral) × 25mm (thickness), a φ 180mm (diameter phi A) × 25mm (wall It is thick) the Q345D material metal circular tube and 2 90mm × 90mm × 300mm Q235B material process bars of × 115mm (length). K-type groove weld seam is connect with the heat input of 6KJ/cm -13KJ/cm welding tube sheetbrace angle.Before welding, method that steel plate is machined into Circular symmetric K-type groove is processed, then by the method group pair in Fig. 1, first inside position to be welded is preheated, then welds slope Mouthful outside groove root is subjected to back chipping processing to 2/3-the 4/5 of entire groove depth, then with machining equipments such as lathes, polishing Outer side weld is once welded completely after clean, then welds remaining inside part.Solid welding wire argon-rich gas MAG welds welding parameter such as table Shown in 1:
The argon-rich gas shielded MAG of 1 heat input 6KJ/cm -13KJ/cm solid welding wire of table welds welding condition
The content that above-described embodiment illustrates should be understood as that these embodiments are only used for being illustrated more clearly that the present invention, without For limiting the scope of the invention, after the present invention has been read, those skilled in the art are to various equivalent forms of the invention Modification each fall within the application range as defined in the appended claims.

Claims (18)

1. a kind of tube sheet corner joint auxiliary welding device, including metal plate(1)And metal tube(2), which is characterized in that further include Process bar(3);The metal plate(1)On be provided with for metal tube(2)The hole that end passes through, the side wall in the hole are K-type groove (4);The metal tube(2)End pass through metal plate(1)On hole, and metal tube(2)End face and metal plate(1)Front (A)It is coplanar;The process bar(3)It is fixed on metal plate(1)Front(A), and and metal tube(2)End face contact;The gold Belong to pipe(2)Outer wall and metal plate hole wall between have gap.
2. tube sheet corner joint auxiliary welding device according to claim 1, which is characterized in that the metal tube(2)For Metal circular tube, metal plate(1)On open circular hole.
3. tube sheet corner joint auxiliary welding device according to claim 2, which is characterized in that the metal tube(2)Outside Annular gap between wall and the circular-hole internal-wall of metal plate is 2mm-3mm.
4. tube sheet corner joint auxiliary welding device according to claim 2, which is characterized in that the K-type groove(4)For The cyclic annular symmetrical groove of K-type.
5. tube sheet corner joint auxiliary welding device according to claim 1, which is characterized in that the process bar(3)Have Two.
6. tube sheet corner joint auxiliary welding device according to claim 5, which is characterized in that the length of the process bar Greater than metal plate(1)The maximum radial dimension in hole at least 100mm.
7. tube sheet corner joint auxiliary welding device according to claim 6, which is characterized in that the length of the process bar Greater than metal plate(1)The maximum radial dimension 100mm-150mm in hole.
8. tube sheet corner joint auxiliary welding device described in any one of -7 according to claim 1, which is characterized in that the gold Belong to plate(1)Thick 10mm-25mm, metal tube(2)Wall thickness 10mm-50mm.
9. tube sheet corner joint auxiliary welding device described in any one of -7 according to claim 1, which is characterized in that the K Type groove(4)Front and back sides bevel angle α be 45 ° -50 °.
10. tube sheet corner joint auxiliary welding device described in any one of -7 according to claim 1, which is characterized in that the K Type groove(4)Root(5)With root face.
11. tube sheet corner joint auxiliary welding device according to claim 10, which is characterized in that the length c of the root face For 1mm-2mm.
12. a kind of tube sheet corner connection connector welding method, which is characterized in that include the following steps:
S1, in metal plate(1)Upper aperture, and K-type groove is processed on the inner wall of hole(4);
S2, by metal plate(1)Front pass through process bar(3)It paves, and fixed metal plate(1)And process bar(3);
S3, by metal tube(2)Across metal plate(1)Hole, in metal tube(2)It is equipped with gap between outer wall and hole inner wall, and protects Demonstrate,prove metal tube(2)End face and metal plate(1)Front it is coplanar;
S4, technique for fixing muscle(3)And metal tube(2), in metal tube(2)With metal plate(1)The double V-groove of the exterior portion of contact Locate spot welding multistage backing weld seam, and preheated metallic pipe(2)With metal plate(1)The double V-groove of the inboard portion of contact and periphery Base material;
S5, to metal plate(1)Hole on the inside of K-type groove root pass bottom welding, after making root pass penetration, part weld seam gold Belong to and penetrates metal tube(2)With metal plate(1)The double V-groove of the exterior portion of contact completes bottom welding;
After S6, bottom welding, the oxide skin on trimming surface, then it is filled the welding of layer, it is welded to K-type groove depth extremely When few half, turn-over removes process bar, and carries out back chipping to the outside double V-groove root of K-type groove;
After the completion of S7, back chipping, weld seam at the outside double V-groove of K-type groove and periphery are preheated, then carry out outside multilayer it is more Road welding finally completes the welding of K-type groove remaining inside depth until outer side weld completely fills out.
13. tube sheet corner connection connector welding method according to claim 12, which is characterized in that the K-type groove is annulus Shape.
14. tube sheet corner connection connector welding method according to claim 13, which is characterized in that the K-type groove it is positive and negative Face bevel angle α is 45 ° -50 °.
15. tube sheet corner connection connector welding method according to claim 12, which is characterized in that in step S6, be welded to K-type slope Mouthful depth 2/3-4/5 when, turn-over removes process bar, and in step S7, K-type groove remaining inside depth is K-type groove depth 1/5—1/3。
16. tube sheet corner connection connector welding method described in any one of 2-15 according to claim 1, which is characterized in that welding side Formula is MAG weldering, and protection gas is containing CO2Rich argon protect gas.
17. tube sheet corner connection connector welding method according to claim 16, which is characterized in that Ar and CO2Volume fraction it Than being 80% -90%:10%—20%.
18. tube sheet corner connection connector welding method according to claim 16, which is characterized in that the welding wire of MAG weldering is solid Welding wire, diameter are 1.2mm -1.6mm, and gas flow is 15 L/min -20L/min, welding current 180-240A, welding electricity Pressure is 28-32V, and speed of welding is 250 mm/min -350mm/min, and interlayer temperature is 50-100 DEG C, step S4, in S7, in advance Hot temperature is 150 DEG C -200 DEG C.
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CN105081538B (en) * 2015-08-25 2017-04-19 哈电集团(秦皇岛)重型装备有限公司 Process for automatically welding small-specification thin-walled tube and small-holed axle tube plate

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