阅读说明：本技术 一种钛钢复合坯采用边条组坯的真空电子束焊接方法 (vacuum electron beam welding method for titanium steel composite blank by adopting edge strip assembly ) 是由 金百刚 刘文飞 马成 李超 王鲁毅 王亮 于 2019-09-06 设计创作，主要内容包括：一种钛钢复合坯采用边条组坯的真空电子束焊接方法,1)在真空电子束焊接领域使用边条设计并将边条提前封焊的方案,解决了真空电子束无法焊接竖缝的技术难题,提高了加工组坯的精度与速度；2)首次提出对钛板提前进行封焊,解决了轧制时隔离剂散落污染复合层的隐患；采用本发明边条组坯工艺替代传统的扣槽工艺,大幅减低了钢铁料消耗和生产成本,轧制后的板坯探伤结果均合格,各项性能远高于用户要求,为扩大优质产品的生产提供了有力的技术支撑。(a titanium steel composite blank adopts the vacuum electron beam welding method of the assembly of the strake, 1) use strake design and scheme to seal weld the strake in advance in the field of welding of the vacuum electron beam, solve the technical problem that the vacuum electron beam can't weld the vertical joint, has improved precision and speed to process assembly; 2) the titanium plate is put forward for sealing and welding in advance for the first time, so that the hidden danger that the isolating agent scatters to pollute the composite layer during rolling is solved; the edge strip assembly process replaces the traditional groove buckling process, the consumption of steel materials and the production cost are greatly reduced, the flaw detection result of the rolled plate blank is qualified, all performances are far higher than the requirements of users, and powerful technical support is provided for expanding the production of high-quality products.)

1. a vacuum electron beam welding method for a titanium steel composite blank by adopting edge strip assembly is characterized by comprising the following steps:

1) Preparing raw materials: preparing two titanium plates as a composite plate, two steel plates as a base plate, and simultaneously preparing two long edge strips and two short edge strips, wherein the length of the long edge strips is equal to the length of a milled base plate blank, the width of the long edge strips is equal to { base plate blank width-composite plate width- (10-16) }/2, and the thickness of the long edge strips is equal to composite plate thickness + (2-4); the length of the short edge strips is equal to the width of the substrate slab-the width of the long edge strips is multiplied by 2, the width is equal to { the length of the substrate slab-the length of the composite plate- (10-16) }/2, and the thickness is equal to the thickness of the composite plate + (2-4);

2) welding edge strips: splicing the long edge strips and the short edge strips together to form a frame; a groove with the depth of 15-30mm and the angle of 5-6 degrees is formed on the outer side of the junction of the long edge strip and the short edge strip; performing full welding on the groove part by adopting argon arc welding;

3) coating a separant: coating a release agent on one surface of the titanium plate, wherein the thickness of the release agent is 0.5-2 mm, and 5-8mm of the edge part is left without coating;

4) Sealing and welding the titanium plate: after the separant is dried in the air, one surfaces of the two titanium plates coated with the separant are orderly stacked together, and the four sides of the titanium plates are clamped by a clamp so that the gap between the two plates is not more than 0.5 mm; then welding spot welding points of 5-8mm at intervals of 200-300mm by adopting an argon arc welding mode; placing the spot-welded titanium plate on a rotary trolley of vacuum electron beam welding equipment, and carrying out welding positioning; then, the titanium plate is transported into a vacuum chamber for vacuum pumping and then electron beam seal welding is carried out;

5) Assembling and welding the composite blank: symmetrically assembling the base plate, the spliced frame, the sealed and welded titanium plate and the base plate in sequence from top to bottom, conveying the assembled blank into a vacuum chamber for electron beam welding, and pressing a 200-plus-300 mm thick plate blank on the top of the assembled blank before entering the vacuum chamber to prevent a welding seam from being heated and deformed in the welding process; firstly, spot welding and then continuous welding are carried out, and the welding principle is symmetrical; welding the upper layer welding seam and then welding the lower layer welding seam.

2. the vacuum electron beam welding method for the titanium steel composite blank by adopting the edge strip assembly as claimed in claim 1, wherein the composite plate is made of TA1 or TA2, and the thickness dimension is 10-40 mm; the roughness is less than or equal to 3mm/m, and the roughness Ra is less than 5.5 mu m.

3. the vacuum electron beam welding method for the titanium steel composite blank by adopting the edge strip assembly as claimed in claim 1, wherein the material of the base plate is Q235, and the thickness dimension is 80-200 mm.

4. the vacuum electron beam welding method for the titanium steel composite blank by adopting the edge strip assembly as claimed in claim 1, wherein the rolling ratio in the step 3) is less than 8, the thickness of the release agent is 0.5-1mm, the rolling ratio is more than or equal to 8, and the thickness of the release agent is 1-2 mm.

5. the vacuum electron beam welding method for the titanium steel composite blank by adopting the edge strip assembly is characterized in that in the step 4), the vacuum electron beam welding current is 50-100 mA, and the welding speed is 10-15 mm/s.

6. the vacuum electron beam welding method for the titanium steel composite blank by adopting the edge strip assembly is characterized in that the spot welding current in the step 5) is 100-150 mA, and the welding speed is 8-10 mm/s; the continuous welding current is 300-400 mA, and the welding speed is 6-8 mm/s.

Technical Field

The invention belongs to the technical field of metal material processing, and particularly relates to a vacuum electron beam welding method for a titanium steel composite blank by adopting edge strip assembly.

Background

The rapid development of scientific technology puts higher demands on advanced manufacturing and processing technology, the first index is to pay attention to energy conservation and consumption reduction, and the second index is to promote safety and service life, thereby achieving the integral upgrade of structure or equipment functionality. In practical application, the structure of a single material is difficult to meet the requirements, and a composite structure adopting dissimilar materials can have the advantages of two materials, so that the cost is reduced to the maximum extent, and the performance is improved.

At present, the method for producing the titanium steel composite plate mainly comprises 4 methods: explosion cladding, diffusion cladding, explosion cladding-rolling, and rolling cladding. The composite boards produced by the first two processes are small in size and sometimes difficult to meet user requirements, and due to the production and operation of high-capacity rolling mills, the two methods are only adopted in certain special fields and have the tendency of being eliminated abroad. The latter two methods can produce large-size titanium steel composite plates, but the explosive welding-rolling method has complex processes, a plurality of factors influencing the bonding strength of the composite plates, large energy consumption, environmental pollution and relatively low yield, and has the tendency of being replaced by the direct rolling method. In recent years, a plurality of scholars research on a technology for preparing titanium steel composite plates by a rolling method, and a blank assembling method of the titanium steel composite plates is taken close attention as a basic link for preparing the composite plates. The common assembly method is to stack carbon steel and titanium plate in sequence and seal-weld the titanium plate to the core of the composite blank by adding carbon steel bar.

for example, in a patent entitled "a method for manufacturing a titanium-steel-titanium double-sided composite plate" filed by li et al, the patent application No. 201210260231.7, and the publication No. CN 102773670a, there is provided a method for producing a blank of a double-sided titanium-steel composite plate: and (3) stacking three carbon steel plates and four titanium plates in sequence, and sealing and welding the titanium plates by using barrier strips.

The patent of northeast university application entitled "a method for preparing titanium-steel composite plate", patent application No. 2010010539065.5, publication No. CN 101992344a, provides a method for preparing a titanium-steel composite plate: and (3) enabling the surfaces of the titanium plates and the steel plates to be opposite and completely overlapped to form a combined blank, sealing the periphery of the combined blank by using four titanium plates as side sealing plates, and then sealing and welding.

the patent entitled "material assembling method and rolling method of titanium steel composite plate" applied by Pan Steel group research institute Co., Ltd, with the patent application number of 201510247496.7 and the publication number of CN 104874634A, provides a material assembling method of titanium steel composite plate, which mainly comprises the following steps: preparing two steel plates, two titanium plates and four side plates, forming a hole in at least one of the side plates, wrapping the two titanium plates in the center by adopting the four side plates and the two steel plates, and then sealing and welding.

However, the above patents have the following problems: the sealing welding of the composite blank by adopting the carbon steel strip or the titanium strip puts higher requirements on the machining and welding of the holding strip, particularly the sealing welding of 4 short vertical edges by adopting a vacuum electron beam is easy to cause welding defects, and the corner part is easy to crack and lose sealing welding effectiveness in the subsequent heating and rolling processes.

The novel edge strip assembly method provided by the invention replaces the traditional edge strip blocking process for sealing and welding, so that the production efficiency is improved, and the production cost is reduced.

Disclosure of Invention

the invention aims to provide a vacuum electron beam welding method for assembling a titanium steel composite blank by adopting an edge strip, which improves the precision and speed of processing the assembly, solves the technical problem that a vertical seam cannot be welded by a vacuum electron beam, and solves the hidden trouble that a composite layer is polluted by scattering of an isolating agent.

In order to achieve the purpose, the invention adopts the following technical scheme:

A vacuum electron beam welding method for a titanium steel composite blank by adopting edge strip assembly comprises the following steps:

1) Preparing raw materials: preparing two titanium plates as a composite plate, two steel plates as a base plate, and simultaneously preparing two long edge strips and two short edge strips, wherein the length of the long edge strips is equal to the length of a milled base plate blank, the width of the long edge strips is equal to { base plate blank width-composite plate width- (10-16) }/2, and the thickness of the long edge strips is equal to composite plate thickness + (2-4); the length of the short edge strips is equal to the width of the substrate slab-the width of the long edge strips is multiplied by 2, the width is equal to { the length of the substrate slab-the length of the composite plate- (10-16) }/2, and the thickness is equal to the thickness of the composite plate + (2-4);

2) welding edge strips: splicing the long edge strips and the short edge strips together to form a frame; a groove with the depth of 15-30mm and the angle of 5-6 degrees is formed on the outer side of the junction of the long edge strip and the short edge strip; performing full welding on the groove part by adopting argon arc welding;

3) Coating a separant: coating a release agent on one surface of the titanium plate, wherein the thickness of the release agent is 0.5-2 mm, and 5-8mm of the edge part is left without coating;

4) Sealing and welding the titanium plate: after the separant is dried in the air, one surfaces of the two titanium plates coated with the separant are orderly stacked together, and the four sides of the titanium plates are clamped by a clamp so that the gap between the two plates is not more than 0.5 mm; then welding spot welding points of 5-8mm at intervals of 200-300mm by adopting an argon arc welding mode; placing the spot-welded titanium plate on a rotary trolley of vacuum electron beam welding equipment, and carrying out welding positioning; then, the titanium plate is transported into a vacuum chamber for vacuum pumping and then electron beam seal welding is carried out;

5) Assembling and welding the composite blank: symmetrically assembling the base plate, the spliced frame, the sealed and welded titanium plate and the base plate in sequence from top to bottom, conveying the assembled blank into a vacuum chamber for electron beam welding, and pressing a 200-plus-300 mm thick plate blank on the top of the assembled blank before entering the vacuum chamber to prevent a welding seam from being heated and deformed in the welding process; firstly, spot welding and then continuous welding are carried out, and the welding principle is symmetrical; welding the upper layer welding seam and then welding the lower layer welding seam.

the composite plate is made of TA1 or TA2, and the thickness is 10-40 mm; the roughness is less than or equal to 3mm/m, and the roughness Ra is less than 5.5 mu m.

The substrate is made of Q235, and the thickness dimension is 80-200 mm.

in the step 3), the rolling ratio is less than 8, the thickness of the release agent is 0.5-1mm, the rolling ratio is more than or equal to 8, and the thickness of the release agent is 1-2 mm.

In the step 4), the welding current is 50-100 mA, and the welding speed is 10-15 mm/s.

In the step 5), the spot welding current is 100-150 mA, and the welding speed is 8-10 mm/s; the continuous welding current is 300-400 mA, and the welding speed is 6-8 mm/s.

compared with the prior art, the invention has the beneficial effects that:

1) the technical problem that the vacuum electron beam cannot be welded in a vertical mode is solved by using a scheme of designing edge strips and sealing and welding the edge strips in advance in the field of vacuum electron beam welding, and the precision and the speed of processing and assembling are improved;

2) The titanium plate is sealed and welded in advance, so that the hidden danger that the isolating agent scatters to pollute the composite layer during rolling is solved;

3) The edge strip assembly replaces the traditional groove buckling process, so that the consumption of steel materials and the production cost are greatly reduced.

the titanium steel composite blank produced by the invention has stable rolling process, qualified flaw detection result of the rolled plate blank, and various performances far higher than the requirements of users, and provides powerful technical support for expanding the production of high-quality products.

Drawings

FIG. 1 is a schematic view of frame assembly welding.

In the figure: 1-groove.

Detailed Description

The following examples are provided to further illustrate the embodiments of the present invention:

A vacuum electron beam welding method for a titanium steel composite blank by adopting edge strip assembly comprises the following steps:

1) Preparing raw materials: preparing two titanium plates as a composite plate, two steel plates as a base plate, and simultaneously preparing two long edge strips and two short edge strips, wherein the length of the long edge strips is equal to the length of a milled base plate blank, the width of the long edge strips is equal to { base plate blank width-composite plate width- (10-16) }/2, and the thickness of the long edge strips is equal to composite plate thickness + (2-4); the length of the short edge strips is equal to the width of the substrate slab-the width of the long edge strips is multiplied by 2, the width is equal to { the length of the substrate slab-the length of the composite plate- (10-16) }/2, and the thickness is equal to the thickness of the composite plate + (2-4);

2) Welding edge strips: splicing the long edge strips and the short edge strips together to form a frame; a groove with the depth of 15-30mm and the angle of 5-6 degrees is formed on the outer side of the junction of the long edge strip and the short edge strip; performing full welding on the groove part by adopting argon arc welding; after welding, hand sanding is carried out on the welding part to ensure that the flatness of the welding part is the same as that of other parts;

3) Coating a separant: wiping oil stain and dust on one surface of the titanium plate, smearing a release agent, wherein the thickness of the release agent is 0.5-2 mm, and 5-8mm of the edge part is left without smearing; after being coated, the separant is placed in dry air to be dried, and the time is not less than 12 hours in summer and not less than 24 hours in winter;

4) Sealing and welding the titanium plate: the method comprises the following steps of sealing and welding a titanium plate firstly, preventing a separant from flowing out to pollute a joint surface during rolling, slightly polishing the other surface (joint surface) of the titanium plate until no pickling solution exists on the surface by using an abrasive belt machine after the separant is dried, and wiping the titanium plate clean by using non-woven fabric dipped with alcohol; firstly, orderly stacking one surfaces of two titanium plates coated with a release agent, and clamping four sides of the titanium plates by using a clamp so that the gap between the two titanium plates is not more than 0.5 mm; completely polishing off the oxide layer on the side surface of the titanium plate after stacking, and then welding spot welding points of 5-8mm at intervals of 200-300mm by adopting an argon arc welding mode; placing the spot-welded titanium plate on a rotary trolley of vacuum electron beam welding equipment, and carrying out welding positioning; then, the titanium plate is transported into a vacuum chamber for vacuum pumping and then electron beam seal welding is carried out; the sealing principle is (shallow melting depth, tight sealing);

5) Assembling and welding the composite blank: symmetrically assembling the base plate, the spliced frame, the sealed and welded titanium plate and the base plate from top to bottom, wherein all surfaces are kept clean in the assembling process; all blanks need to be protected on the surfaces in the lifting and moving processes, so that scratches and secondary pollution are avoided, otherwise, the blanks need to be immediately wiped clean by high-purity alcohol; the assembled blank is sent to a vacuum chamber for electron beam welding, a 200-plus-300 mm thick plate blank is pressed on the top of the assembled blank before the assembled blank enters the vacuum chamber, and the welding seam is prevented from being heated and deformed in the welding process; firstly, spot welding and then continuous welding are carried out, and the welding principle is symmetrical; welding an upper layer welding seam and then welding a lower layer welding seam; after welding, utilizing secondary imaging to check the quality of the welding seam, and if welding defects exist, carrying out repair welding by using a special small program;

before welding, the top thickened plate blank releases heat and deforms, and the welding mode adopts a mode of firstly welding an upper layer welding seam and then welding a lower layer welding seam to avoid welding deformation;

6) And after welding, heating and rolling according to the rolling principle of the titanium steel composite blank.

The composite plate is made of TA1 or TA2, and the thickness is 10-40 mm; processing requirements are as follows: the surface is flat and free of defects, wedge shapes and sickle curves are not allowed to appear, the unevenness is less than or equal to 3mm/m, and the roughness Ra is less than 5.5 mu m. Deep acid washing is carried out, and no oxide point exists after acid washing;

the substrate is made of Q235, and the thickness dimension is 80-200 mm. Firstly, the steel is initially rolled, straightened and then milled and ground. Milling and grinding requirements: the milling depth of the single surface is more than or equal to 5 mm.

the thickness of the release agent in the step 3) is related to the rolling ratio of the titanium steel composite blank, the rolling ratio is less than 8, the thickness of the release agent is 0.5-1mm, the rolling ratio is more than or equal to 8, and the thickness of the release agent is 1-2 mm.

In the step 4), the welding current is 50-100 mA, and the welding speed is 10-15 mm/s.

in the step 5), the spot welding current is 100-150 mA, and the welding speed is 8-10 mm/s; the continuous welding current is 300-400 mA, and the welding speed is 6-8 mm/s.