CN115740757A - Titanium/steel composite board welding method for transition of titanium and steel composite prefabricated part - Google Patents
Titanium/steel composite board welding method for transition of titanium and steel composite prefabricated part Download PDFInfo
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Abstract
The invention discloses a welding method of a titanium/steel composite plate with a titanium and steel composite preform transition, which relates to the technical field of welding and aims to solve the problems that a longitudinal welding seam is difficult to avoid titanium/iron element contact to form a titanium/iron intermetallic compound and a transition layer is adopted at an interface of the titanium/steel composite plate to avoid a brittle and hard intermetallic compound generated by direct contact of titanium steel in the welding process. The welding of the titanium/steel composite plate is realized by adopting the titanium/steel composite plate as the prefabricated body, the welding sequence is that the existing titanium/steel composite plate is firstly manufactured into a strip-shaped prefabricated body composite plate, the strip-shaped prefabricated body composite plate is assembled with the composite plate to be welded, firstly, CMT is utilized to carry out steel side surfacing, and finally, TIG or laser welding is adopted at two sides of the block-shaped composite plate to realize self-fluxing or wire filling welding seams.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a method for welding a titanium/steel composite plate by means of transition of a titanium alloy and steel composite connection prefabricated part.
Background
The titanium steel composite board is a bimetal composite board which takes carbon steel as a base layer and industrial pure titanium or titanium alloy as a composite layer, has the advantages of excellent corrosion resistance of titanium, high strength and high elastic modulus of structural steel and the like, and has good comprehensive performance; in addition, compared with a product made of a single material, the production cost of the product is greatly reduced. Therefore, the method is widely applied to many fields such as petrochemical industry, vacuum salt production, electrical engineering and the like. However, titanium/steel composite plates have poor metallurgical compatibility with steel during welding, and mutual dissolution of titanium and steel during welding can result in brittle and hard intermetallic compounds of TiFe and TiFe 2 Can lead to the occurrence of cracks which seriously degrade the mechanical properties of the joint.
Due to the problems, the titanium/steel composite plate can obtain a better welding joint through reasonable structural design and selection of a proper transition material during welding. In the aspect of structural design, transition-free welding of the titanium/steel composite plate is mainly carried out by adding a cover plate, a filling plate and the like to avoid the contact of titanium/steel, titanium and steel are respectively and independently welded, and the problem that brittle and hard compounds are generated when the titanium steel is melted is solved. At present, the technology is mature, and the national standard 'technical requirement for welding titanium and titanium alloy composite steel plates' is made according to the technology (GB/T13149-2009). Transition-free welded joints can be divided into lap joints and butt joints. The lap joint mode comprises flat plate lap joint, flat plate lap joint (containing a filling plate), circular arch plate lap joint, square arch plate lap joint, trough plate lap joint and the like. Due to the particularity of the lap joint structure, the lap joint structure has structural limitations in application. In order to overcome the structural defects, joint forms such as direct butt joint and straight titanium plate butt joint are developed, and the requirements of most scenes can be met.
The patent with the patent number CN111331279A discloses a high-entropy alloy preform and a fusion welding method of titanium and stainless steel, which is equivalent to the fact that a high-entropy alloy transition layer is prefabricated between the titanium and the steel, and welding of dissimilar metal titanium plates and steel plates is achieved.
Titanium/steel composite plate welding also developed the technique of transition welding. At present, the mainstream transition materials comprise nickel, copper, niobium, vanadium and the like, and researchers use different transition layer materials to research the welding of the titanium/steel composite plate. The patent with publication number CN102699484B discloses a welding method for welding a titanium/steel composite plate by using pure niobium as a transition layer, the patent with publication number CN103785962B discloses a welding method for welding a titanium/steel composite plate by using pure vanadium as a transition layer, the patent with publication number CN106112263B discloses a welding method for a titanium/steel composite plate by using T2 red copper as a transition layer, and the patent with publication number CN107984054B discloses a welding method for a titanium/steel composite plate by using nickel and nickel-based alloy as a transition layer.
To sum up, the structural design of the current titanium/steel composite plate transition-free welded joint is mainly carried out from the simultaneous melting of titanium and steel, a non-penetration welding area exists in the structure, the titanium cover plate is in physical contact with the steel, metallurgical connection does not exist, and the titanium/steel composite plate transition-free welded joint is a position with poor performance in the joint.
The method adopting the transition material has the advantages that due to the fact that no proper material is available, the compatibility with titanium and the compatibility with steel are good, the isolation effect of the transition layer is limited, the longitudinal welding line is difficult to avoid titanium/iron element contact to form a titanium/iron intermetallic compound, and even if the transition layer is adopted at the interface of the titanium/steel composite plate, the brittle and hard intermetallic compound generated by direct contact of the titanium steel in the welding process is difficult to avoid.
Disclosure of Invention
The invention aims to solve the problems that a longitudinal welding seam is difficult to avoid titanium/iron element contact to form a titanium/iron intermetallic compound due to the fact that a titanium/steel composite plate does not have a proper transition material, and the brittle and hard intermetallic compound generated by direct contact of molten titanium steel in the welding process is difficult to avoid even a transition layer is adopted at the interface of the titanium/steel composite plate. A novel welding method for a prefabricated transitional titanium/steel composite plate is provided. The preform adopted in the invention is made of a titanium/steel composite plate, which is different from the physical contact between titanium and steel in butt welding, and forms effective metallurgical connection at the titanium/steel interface of the preform. The traditional butt welding generally adopts the forms of cover plates and the like, welding seams are respectively formed only on the titanium side and the steel side, and the cover plates and the steel side are in clearance and are not connected (in a large range); the titanium/steel interface in the form of a preform adopted by the invention forms effective diffusion connection, and only the contact interface of the plug block and the base material is not welded completely and is not connected (locally).
In order to achieve the purpose, the technical solution of the invention is as follows:
the invention provides a novel welding structure of a titanium/steel composite plate with prefabricated body transition, which adopts a titanium/steel composite plate block as a prefabricated body to realize the welding of the titanium/steel composite plate, adopts the welding sequence that the existing titanium/steel composite plate is firstly made into a strip-shaped prefabricated body composite plate, the strip-shaped prefabricated body composite plate is assembled with a composite plate to be welded, firstly, the CMT is utilized to carry out steel side surfacing, and finally, TIG or laser welding is adopted at two sides of a block-shaped composite plate to realize self-melting or wire-filling welding seams.
The method replaces the transition layer with the prefabricated body, can effectively avoid the defect that the transition effect of the titanium/steel composite plate is limited during welding, and avoids the generation of titanium/iron intermetallic compounds generated by melting at the titanium/steel interface. Meanwhile, the preform is made of a titanium/steel composite plate, unlike the physical contact between titanium and steel in butt welding, which forms an effective metallurgical connection at the titanium/steel interface of the preform.
The invention relates to a welding method of a titanium/steel composite plate with a transitional titanium and steel composite prefabricated body, which comprises the following steps:
1) Opening a groove on the steel side of the prewelded titanium steel composite plate, and opening a groove with the shape and the size consistent with those of the prefabricated part on the titanium side; cleaning grooves formed on the steel side and the titanium side and the vicinity of the grooves;
2) Cutting the titanium steel composite plate into a strip-shaped prefabricated body by using a machine, and cleaning the strip-shaped prefabricated body;
3) Assembling the cleaned pre-welded titanium steel composite plate with a strip-shaped prefabricated body, attaching the titanium side surface of the strip-shaped prefabricated body to the titanium side surface of the pre-welded titanium steel composite plate, attaching the steel side surface of the strip-shaped prefabricated body to the steel side surface of the pre-welded titanium steel composite plate, and performing self-fusion welding of four corners on the steel side attaching surface after assembling;
wherein, four angles's self-fluxing weld is fixed, takes place to warp in order to prevent the welding process.
4) Performing TIG (tungsten inert gas) self-fluxing backing welding on the steel side binding surface of the strip-shaped prefabricated body and the titanium steel composite plate to be welded in advance, cleaning the surface of a welding seam after welding until no dirt exists, and overlaying a welding wire on the steel side by using CMT (China Mobile technology for welding), wherein the residual height is less than 1mm;
5) And (3) forming a V-shaped groove at the intersection of the titanium sides of the pre-welded titanium steel composite plate and the strip-shaped preform according to the requirement, and performing laser/TIG self-melting/wire-filling welding along the assembly direction of the strip-shaped preform (namely the section of the strip-shaped preform is quadrilateral, namely figures 5-10) and the pre-welded titanium steel composite plate, namely completing the welding of the titanium/steel composite plate with the transitional titanium and steel composite preform.
Further, the groove on the side of the steel in the step 1) is a V-shaped groove on the side of the steel, and the angle of the groove is 60-90 degrees.
Further, cleaning the vicinity of the groove in the step 1), wherein the distance between the cleaning range and the edge of the groove is more than or equal to 15mm.
Further, the strip-shaped preform in the step 2) is triangular, rectangular or trapezoidal, and the top angle and the bottom angle of the strip-shaped preform (i.e. the cross-sectional pattern of the strip-shaped preform, i.e. fig. 5-10) are 45-135 ° and 45-135 °.
Further, the width of the strip-shaped preform in the step 2) is 10mm-20mm.
Further, the thickness of the titanium side of the strip-shaped prefabricated body in the step 2) is more than or equal to that of the titanium side of the pre-welded titanium steel composite plate, and the thickness of the steel side of the strip-shaped prefabricated body is 2-5 mm.
Further, the strip-shaped prefabricated body is a composite plate strip-shaped body processed by a titanium/steel composite plate which is welded with the titanium steel composite plate in advance.
Further, the welding wire in the step 4) is H08Mn2Si welding wire.
Further, laser welding or argon tungsten-arc welding is used for welding the quadrilateral blocks in the step 5).
Further, the temperature between the laser/TIG self-fluxing/wire filling welding channels in the step 5) is less than 150 ℃.
Furthermore, the welding seam of the titanium/steel interface of the strip-shaped prefabricated body and the pre-welded titanium steel composite plate is not welded completely (the middle of the contact surface of the titanium/steel interface of the strip-shaped prefabricated body and the pre-welded titanium steel composite plate is not welded), and the titanium/steel interface area has no fusion of titanium/iron.
The beneficial effect of the invention is that,
(1) By using the welding structure of the strip-shaped prefabricated body, the titanium/steel interface is not melted, so that a large amount of brittle and hard intermetallic compounds generated by melting at the titanium/steel interface during welding are effectively avoided.
(2) By using the welding structure of the strip-shaped prefabricated body for transition, effective isolation between longitudinal titanium and steel of a welding seam is realized, and direct/indirect contact between titanium and iron elements is avoided.
(3) By using the welded structure of the strip-shaped preform for the transition, an effective metallurgical connection between the titanium plate and the steel is formed, unlike the physical contact without transition butt welding.
(4) The CMT method adopted by the steel base layer reduces the number of welding tracks, reduces the heat input, effectively controls the welding stress and deformation after welding, and has smooth and beautiful forming.
(5) The strip-shaped prefabricated body and the base metal are welded smoothly without abrupt change, and no obvious stress concentration area exists after welding.
(6) The strip-shaped prefabricated body is rich in form and large in size range, the structure of the strip-shaped prefabricated body can be specified according to the thickness, the size and the like of the titanium layer of the base material, the process is simple, and the groove can be formed to control the penetration depth of the titanium side so as to ensure the thickness of an area which is not welded through.
Drawings
FIG. 1 is a schematic view of a preform sampling position of the present invention;
FIG. 2 is a diagram of a rectangular strip preform designed according to the present invention;
FIG. 3 is a diagram of a trapezoidal strip preform designed according to the present invention;
FIG. 4 is a diagram of a triangular strip preform designed in accordance with the present invention;
FIG. 5 is a schematic view of the assembly of the rectangular strip-shaped preform before welding designed by the present invention;
FIG. 6 is a schematic view of the assembly of the trapezoidal strip-shaped preform before welding designed by the present invention;
FIG. 7 is a schematic view of the assembly of the triangular strip-shaped preform before welding designed by the present invention;
FIG. 8 is a schematic view of a welded seam of a rectangular strip preform designed in accordance with the present invention;
FIG. 9 is a schematic view of a welded seam of a trapezoid-shaped strip-shaped preform designed according to the present invention;
FIG. 10 is a schematic view of a welded seam of a triangular strip preform designed in accordance with the present invention;
FIG. 11 is a diagram illustrating the welding effect of the preform and the titanium steel composite plate in embodiment 1; wherein, (a) is a titanium alloy side weld effect picture, (b) is a steel side weld effect picture, and (c) is a joint section picture;
the meaning of the various reference numbers in the drawings: 1-rectangular preform titanium side, 2-rectangular preform steel side, 3-trapezoidal preform steel side, 4-trapezoidal preform titanium side, 5-triangular preform titanium side, 6-triangular preform steel side, 7-titanium plate, 8-steel substrate, 9-rectangular preform, 10-trapezoidal preform, 11-triangular preform, 12-rectangular preform steel side weld, 13-rectangular preform steel side backing weld, 14-rectangular preform titanium side self-fusion weld, 15-trapezoidal preform steel side weld, 16-trapezoidal preform steel side backing weld, 17-trapezoidal preform titanium side self-fusion weld, 18-triangular preform steel side weld, 19-triangular preform steel side backing weld, 20-triangular preform titanium side self-fusion weld.
Detailed Description
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
To make the objects, aspects and advantages of the embodiments of the present invention more apparent, the following detailed description clearly illustrates the spirit of the disclosure, and any person skilled in the art, after understanding the embodiments of the disclosure, may make changes and modifications to the technology taught by the disclosure without departing from the spirit and scope of the disclosure.
Referring to fig. 1, fig. 1 is a structural diagram of a welding joint of a titanium/steel composite plate designed by the present invention, referring to fig. 3,4, and fig. 3,4 is a model diagram of a quadrilateral plug of a titanium/steel composite plate according to the present invention, when butt welding is performed on a titanium/steel composite plate composed of a TA2 titanium coating with a thickness of 2mm or more and a low carbon steel with a thickness of 7mm or more, a quadrilateral plug structure is used for welding on a titanium side, and a welding method includes the following steps:
1) V-shaped grooves are formed in the side of two titanium steel composite plates which are subjected to butt welding in advance, the angle of the grooves is 60 +/-10 degrees, the side grooves of the titanium steel composite plates are determined according to the strip-shaped prefabricated body, the grooves and the positions near the grooves are cleaned, the cleaning range is not less than 15mm away from the edges of the grooves, oil, water, rust, oxide layers and the like do not need to be arranged in the cleaned area, and metal luster is exposed on the surface.
2) And cutting the titanium steel composite plate into a strip-shaped prefabricated body by using a wire cutting machine. The strip-shaped prefabricated body is triangular, rectangular or trapezoidal,
the top angle is 45-135 degrees, the bottom angle is 45-135 degrees, and the angle error of the strip-shaped prefabricated body is required to be less than 1 degree. The thickness of the titanium side of the strip-shaped prefabricated body is more than or equal to that of the titanium side of the base material, and the thickness of the steel side of the strip-shaped prefabricated body is more than 2mm and less than 5mm; the shortest side width of the strip-shaped prefabricated body is 10-20mm, and the strip-shaped prefabricated body is cleaned to remove an oxidation film and oil stains on the surface and expose the metallic luster.
3) And (3) assembling the composite board to be welded with the strip-shaped prefabricated body, wherein the titanium side plane of the strip-shaped prefabricated body is required to be aligned with the titanium side plane of the base metal, the longitudinal error is not more than 0.1mm, and four corners are subjected to point-fixing welding on the steel side after the assembly.
4) And (3) performing TIG (tungsten inert gas) self-fluxing welding bottoming on the boundary of the small block close to the steel side, wherein the welding current is 100-130A, the welding speed is 2mm/s, the surface of a welding line is cleaned after welding, an oxidation film and oil stains on the surface are removed, and the metal luster is exposed. If the unevenness exists, the straightening treatment is carried out.
5) And (3) performing swing surfacing on the steel side by using CMT (China Mobile technology), wherein H08Mn2Si welding wires are welded at 130-170A, welding speed is 3-5mm/s, wire feeding speed is 6-8mm/s, a groove is fully piled together, and the rest height is less than 1mm.
6) And performing laser welding/argon tungsten-arc welding along the directions of two sides of the assembly of the strip-shaped prefabricated part and the composite plate, wherein an IPG-4000 type laser is used for laser welding, the laser power is 3-5KW, the welding speed is 4-6m/min, the defocusing amount f =10-15mm, and the laser welding inclination angle is 60-80 degrees. The welding current of argon tungsten-arc welding is 140-180A, the welding speed is 2-4mm/s, and the wire feeding speed is 4-7mm/s. When the groove is formed, pure titanium welding wires are filled. The heat input is strictly controlled during welding, the temperature between channels is less than 150 ℃, the influence on a titanium/steel interface is prevented, and meanwhile, the incomplete penetration is ensured.
6) According to the test method of the mechanical and technological properties of the GB6393-2008 composite board, the welding sample is subjected to an integral tensile test, the detection result is compared with the national standard, and whether cracks are generated or not is detected.
Example 1:
the method is suitable for welding the rectangular chock block with a V-shaped groove formed in the upper steel side and a truncated edge left on the titanium side of the TA2/Q235 titanium steel composite plate (2mm + 8mm), and the specific welding process is as follows:
1) Two titanium steel composite plates which are pre-butt welded are provided with V-shaped grooves, the groove angle is 70 degrees, 4mm of truncated edges are left on the titanium side, the grooves and the positions near the grooves are cleaned, the cleaning range is not less than 15mm away from the edges of the grooves, the areas are not required to be oil, water, rust, oxide layers and the like after cleaning, and the surfaces are exposed with metallic luster.
2) The method comprises the steps of cutting a titanium steel composite plate into a rectangular strip-shaped prefabricated body by using a linear cutting machine, wherein the width of the rectangular strip-shaped prefabricated body is 8mm, the angle precision error is less than 1 degree, the titanium side thickness of the strip-shaped prefabricated body is equal to the titanium side thickness of a base material by 2mm, the steel side thickness of the strip-shaped prefabricated body by 2mm, and the width of the strip-shaped prefabricated body by 10mm, cleaning the strip-shaped prefabricated body, removing an oxide film and oil stains on the surface, and exposing metallic luster.
3) Assembling the composite board to be welded with the rectangular strip-shaped prefabricated body, wherein the titanium side plane of the block is required to be aligned with the titanium side plane of the base material, the longitudinal error is not more than 0.1mm,
4) Four corners are spot-welded on the steel side. And (3) performing TIG (tungsten inert gas) self-fluxing welding bottoming on two sides of the rectangular block close to the steel side, wherein the welding current is 120A, the welding speed is 2mm/s, the surface of a welding seam is cleaned after welding, an oxidation film and oil stains on the surface are removed, and the metallic luster is exposed. If the unevenness exists, the straightening treatment is carried out.
5) And (3) performing swing surfacing on the H08Mn2Si welding wire on the steel side by using CMT (China Mobile technology), wherein the welding current is 150A, the welding speed is 3mm/s, the wire feeding speed is 8mm/s, the groove is fully piled up at one time, and the residual height is less than 1mm.
6) And performing laser wire filling welding along the groove direction of the assembly of the rectangular block and the composite plate, wherein an IPG-4000 model optical fiber laser is used, the laser power is 4KW, the welding speed is 5m/min, the wire feeding speed s =5m/min, the defocusing amount f =10mm, and the inclination angle of the laser beam is 80 degrees. The heat input is strictly controlled during welding, the temperature between the channels is less than 150 ℃, the influence on the titanium/steel interface is prevented, and meanwhile, the incomplete penetration is ensured.
7) According to the test method of the mechanical and technological properties of the GB6393-2008 composite board, the welding sample is subjected to an integral tensile test, the detection result is compared with the national standard, and whether cracks are generated or not is detected. The weld results of the welded samples are shown in FIG. 11, and it can be seen from FIG. 11 that the weld transitions smoothly without projections.
Example 2:
the method is suitable for welding a double V-shaped groove on a (3mm + 10mm) TA2/Q235 titanium steel composite plate, wherein the groove is truncated in the middle, and the specific welding process is as follows:
1) And (3) forming double V-shaped grooves on the two titanium steel composite plates which are subjected to butt welding in advance, wherein the angle of the grooves is 60 degrees, cleaning the grooves and the positions near the grooves, the cleaning range is not less than 15mm away from the edges of the grooves, the cleaned area is free from oil, water, rust, oxide layers and the like, and the surfaces of the areas are exposed with metallic luster.
2) The titanium steel composite board is cut into a trapezoid strip-shaped prefabricated body by using a linear cutting machine, the titanium side width of the trapezoid strip-shaped prefabricated body is 15mm, the steel side angle is 120 degrees, the angle precision error is smaller than 1 degree, the titanium side thickness of the strip-shaped prefabricated body is equal to the titanium side thickness of a base material by 3mm, the steel side thickness of the strip-shaped prefabricated body by 3mm and the width of the strip-shaped prefabricated body by 10mm, the strip-shaped prefabricated body is cleaned, an oxide film and oil stains on the surface are removed, and metallic luster is exposed.
3) And (3) assembling the composite board to be welded and the rectangular strip-shaped prefabricated body, wherein the titanium side plane of the block is required to be aligned with the titanium side plane of the base metal, the longitudinal error is not more than 0.1mm, and the four corners of the steel side are subjected to point welding after the assembly.
4) And (3) performing TIG (tungsten inert gas) self-fluxing welding bottoming on two sides of the rectangular block close to the steel side, wherein the welding current is 120A, the welding speed is 2mm/s, the surface of a welding seam is cleaned after welding, an oxidation film and oil stains on the surface are removed, and the metallic luster is exposed. If the unevenness exists, the straightening treatment is carried out.
5) And (3) performing swing surfacing on the H08Mn2Si welding wire on the steel side by using CMT (China Mobile technology), wherein the welding current is 170A, the welding speed is 2mm/s, the wire feeding speed is 8mm/s, the groove is fully piled up at one time, and the residual height is less than 1mm.
5) Argon tungsten-arc welding is carried out along the two sides of the assembly of the trapezoidal blocks and the composite plate, the welding current is 160A, and the welding speed is 3mm/s. The heat input is strictly controlled during welding, the temperature between channels is less than 150 ℃, the influence on a titanium/steel interface is prevented, and meanwhile, the incomplete penetration is ensured.
6) According to the test method of the mechanical and technological properties of the GB6393-2008 composite board, the welding sample is subjected to an integral tensile test, the detection result is compared with the national standard, and whether cracks are generated or not is detected.
Example 3:
the method is suitable for welding the large V-shaped groove triangular chock block on the (2mm + 8mm) TA2/Q235 titanium steel composite plate, and the specific welding process is as follows:
1) And (3) forming a V-shaped groove on the two titanium steel composite plates which are subjected to butt welding in advance, wherein the angle of the groove is 60 degrees, cleaning the groove and the vicinity of the groove, the cleaning range is not less than 15mm from the edge of the groove, the cleaned area does not contain oil, water, rust, an oxide layer and the like, and the surface of the area is exposed with metallic luster.
2) Cutting the titanium steel composite plate into a triangular strip-shaped prefabricated body by using a linear cutting machine, wherein the tip angle of the triangular strip-shaped prefabricated body is 60 degrees, the precision error is less than 1 degree, the titanium side thickness of the strip-shaped prefabricated body is equal to 2mm of the titanium side thickness of wood, 2mm of the steel side thickness of the strip-shaped prefabricated body and 15mm of the steel side width of the strip-shaped prefabricated body, cleaning the strip-shaped prefabricated body, removing an oxide film and oil stains on the surface, and exposing metallic luster.
3) And (3) assembling the composite board to be welded and the triangular strip-shaped prefabricated body, aligning the tip of the strip-shaped prefabricated body with the base metal, and performing point-fixing welding on four corners on the steel side after assembling.
4) And (3) performing TIG (tungsten inert gas) self-fluxing welding bottoming on two sides of the triangular block close to the steel side, welding current of 120A and welding speed of 2mm/s, cleaning the surface of a welding seam after welding, and removing an oxide film and oil stains on the surface to expose metallic luster. If the unevenness exists, the straightening treatment is carried out.
5) And (3) performing swing surfacing on the H08Mn2Si welding wire on the steel side by using CMT (China Mobile technology), wherein the welding current is 150A, the welding speed is 3mm/s, the wire feeding speed is 8mm/s, the groove is fully piled up at one time, and the residual height is less than 1mm.
5) And performing laser self-fusion welding along the directions of two sides of the assembled triangular block and the composite plate, wherein an IPG-4000 type optical fiber laser is used, the laser power is 4KW, the welding speed is 5m/min, the defocusing amount is f =10mm, and the inclination angle of a laser beam is 30 degrees. The heat input is strictly controlled during welding, the temperature between channels is less than 150 ℃, the influence on a titanium/steel interface is prevented, the lower melting depth boundary is close to the titanium/steel interface of a base metal (about 1 mm), and the titanium/steel interface is ensured not to be welded completely.
6) According to the test method of the mechanical and technological properties of the GB6393-2008 composite board, the welding sample is subjected to an integral tensile test, the detection result is compared with the national standard, and whether cracks are generated or not is detected.
Claims (10)
1. A welding method of a titanium/steel composite plate with a titanium and steel composite preform transition is characterized by comprising the following steps:
1) Opening a groove on the steel side of the prewelded titanium steel composite plate, and opening a groove with the shape and the size consistent with those of the prefabricated part on the titanium side; cleaning grooves formed in the steel side and the titanium side and the vicinity of the grooves;
2) Cutting the titanium steel composite plate into a strip-shaped prefabricated body by using a machine, and cleaning the strip-shaped prefabricated body;
3) Assembling the cleaned pre-welded titanium steel composite plate with a strip-shaped prefabricated body, attaching the titanium side surface of the strip-shaped prefabricated body to the titanium side surface of the pre-welded titanium steel composite plate, attaching the steel side surface of the strip-shaped prefabricated body to the steel side surface of the pre-welded titanium steel composite plate, and performing self-fusion welding of four corners on the steel side attaching surface after assembling;
4) Performing TIG (tungsten inert gas) self-fluxing backing welding on the steel side binding surface of the strip-shaped prefabricated body and the titanium steel composite plate to be welded in advance, cleaning the surface of a welding seam after welding until no dirt exists, and overlaying a welding wire on the steel side by using CMT (China Mobile technology for welding), wherein the residual height is less than 1mm;
5) And (3) forming a V-shaped groove at the intersection of the titanium sides of the pre-welded titanium steel composite plate and the strip-shaped prefabricated body according to the requirement, and performing laser/TIG (tungsten inert gas) self-fluxing/filler wire welding along the assembly direction of the strip-shaped prefabricated body and the pre-welded titanium steel composite plate, so that the titanium/steel composite plate transitional by the titanium and steel composite prefabricated body is welded.
2. The method for welding the titanium/steel composite plate with the transitional titanium and steel composite preforms according to claim 1, wherein the bevel on the steel side in the step 1) is a V-shaped bevel on the steel side, and the bevel angle is 60-90 degrees.
3. The method for welding the titanium/steel composite plate with the transitional titanium and steel composite preforms of claim 1, wherein the cleaning is performed near the bevel in step 1), and the distance between the cleaning range and the bevel edge is greater than or equal to 15mm.
4. The method for welding the titanium/steel composite plate transitional from the titanium and steel composite preforms according to claim 1, wherein the strip-shaped preforms in step 2) are triangular, rectangular or trapezoidal, and the top angle and the bottom angle of the strip-shaped preforms are 45-135 ° and 45-135 °.
5. A method for welding titanium/steel composite panels in transition of titanium and steel composite preforms according to claim 1 or 4, characterised in that the width of the strip preform in step 2) is between 10mm and 20mm.
6. The method for welding the titanium/steel composite plate with the transitional titanium and steel composite prefabricated body according to claim 5, wherein the thickness of the titanium side of the strip-shaped prefabricated body in the step 2) is greater than or equal to that of the titanium side of the titanium steel composite plate to be welded in advance, and the thickness of the steel side of the strip-shaped prefabricated body is 2-5 mm.
7. The method for welding the titanium/steel composite plate transitional from the titanium and steel composite prefabricated body according to the claim 1 or 6, characterized in that the strip-shaped prefabricated body is a composite plate strip body processed by titanium/steel composite plates which are homogeneous to the titanium steel composite plate and are welded in advance.
8. The method for welding titanium/steel composite plates with transition of titanium and steel composite preforms as claimed in claim 1, wherein the welding wire in step 4) is H08Mn2Si welding wire.
9. The method for welding the titanium/steel composite plate with the transition titanium and steel composite preform according to claim 1, wherein the quadrilateral blocks are welded in the step 5) by laser welding or argon tungsten-arc welding.
10. A method for welding titanium/steel composite panels with titanium and steel composite preform transition according to claim 1, characterized in that the interchannel temperature of laser/TIG self-fluxing/filler wire welding in step 5) is less than 150 ℃.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05185237A (en) * | 1991-12-11 | 1993-07-27 | Nippon Steel Corp | End welding method for titanium clad steel plates |
| CN101664852A (en) * | 2009-09-29 | 2010-03-10 | 西部金属材料股份有限公司 | Titanium and steel composite board welding method |
| CN103537816A (en) * | 2013-09-22 | 2014-01-29 | 中国兵器工业第五二研究所 | Welding method of metal layer shaped composite board |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05185237A (en) * | 1991-12-11 | 1993-07-27 | Nippon Steel Corp | End welding method for titanium clad steel plates |
| CN101664852A (en) * | 2009-09-29 | 2010-03-10 | 西部金属材料股份有限公司 | Titanium and steel composite board welding method |
| CN103537816A (en) * | 2013-09-22 | 2014-01-29 | 中国兵器工业第五二研究所 | Welding method of metal layer shaped composite board |
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