Production of steel sheet and steel sheet thus made

FIELD: process engineering.

SUBSTANCE: invention relates to production of steel sheet articles from different-depth steel sheet or strips. Billets are welded together along the butt to get the weld (7) composed by edges of steel sheet or strip workpiece. To rule out loss of quenched structure produced by heating to austenitising temperature, at least one edge of sheet or strip (8, 9) is coated before welding with thick fluid or solid powder or aerosol-like matter including at least one component increasing the strength of the weld (10).

EFFECT: higher weld strength.

28 cl, 2 dwg

 

The technical field to which the invention relates

The invention relates to a method for manufacturing steel sheet products, wherein the workpiece of a steel sheet or steel tape of different thickness and/or material are welded together along a butt seam formed by the edges of workpieces of sheet steel or steel bands, and also sheet steel product (semi-finished), which is intended for the manufacture of pressure-treated in a hot state of the structural element and assembled from blanks of sheet steel or steel strips of different thickness and/or different material, welded together along a butt joint.

The level of technology

In modern automotive industry apply welded with each other workpieces of sheet steel, which are collected from various thicknesses of sheets and/or different material quality. This allows to adapt to different places of the late structural elements to local loads that otherwise require additional parts gain. This might lead to the reduced weight of the corresponding structural element. Further can be reduced manufacturing costs. The connection of workpieces of sheet steel is usually in the joint by laser welding. Similar blanks of sheet steel are referred to as Tailored Blanks" or "Tailored Weldet Blanks" (made in accordance with the order blanks). Thanks to directional influence of the welding process, in particular, with the help of a sharp cooling of the weld with water after the docking process is achieved podolka the weld, reducing the sensitivity of the weld to fracture (preventing a sharp decrease in hardness) and its strength may be increased, at least, can be installed the same strength with basic metals. If Tailored Blanks are deformed by processing the pressure in the hot state with the formation of three-dimensional structural element, it is possible, however, the structure of the weld as a result of heat treatment of welded prefabricated given homogeneity. Due to adverse cooling conditions or failure of the geometric circuit between the tool and plastic deformation of the workpiece may occur incomplete transformation of austenite to martensite and predetection allocation ferrite consequence of the loss of hardness in comparison with the basic metals.

Disclosure of the invention

The basis for the present invention is the development of a method of manufacturing a steel product to be handling the pressure of the hot products of steel sheet, and the corresponding sheet steel products as semi-finished product, whereby vozmozhnostuvelichivat strength of the weld compared to the base metals to be connection of steel sheets, at least at the same level, so that a sharp drop in hardness of the weld can be prevented even after the hot pressure treatment during the previous heating to a temperature of austenitization.

This problem is solved in the method with signs of paragraph 1 of the claims, respectively the signs for sheet steel products (semifinished) with signs of paragraph 20 of the claims.

Proposed in the invention method is characterized in that before the welding process on at least one welded flange be welded to each other workpieces made of steel sheet or steel tape is applied at least partially viscous liquid, in particular, paste, or grease, powdery or similar aerosol substance, which, respectively, contain at least one component which contributes to the strength of the spin weld.

By introducing at least one component which contributes to the strength of the spin-weld, on top of at least one of the edges of steel sheets that define a butt joint, in a liquid bath of molten metal is directed is achieved differentially modified in its chemical composition, the primary structure compared with the structures of the connected base metal, after which raskog� cooling in the welding process (e.g., using rapid cooling by water), heating during hot pressure treatment (heat treatment above the temperature of austenitization) and cooling during processing pressure (direct pressure treatment, respectively quenching on the press), but also on the stages of the process of indirect hot forming, is mostly a more rigid secondary structure than jointed by the welding base metals, at least, identical in hardness structure.

Proposed in accordance with the invention, a sheet steel product (semi-finished) accordingly is characterized in that the weld seam after abrupt cooling, heating to a temperature above the temperature of austenitization and repeated sudden cooling is mostly a more solid structure than the join welding of blanks of sheet steel respectively steel tape, and the structure is at least identical in strength.

Studies have shown that the weld strength can be achieved with laser welding with the introduction, in particular, carbon in the bath of molten metal during welding.

A preferred execution is proposed in accordance with the invention method therefore provides that, as a viscous liquid used oil, particularly a mineral oil and/�whether the grease. These carbon-containing fluid, respectively, solid, powdery or similar aerosol substances that, at least, contain components that increase the strength of the spin-weld, mainly contain carbon, relatively favorable economic position and can simply be fed to the liquid bath of molten metal during welding.

Another preferred execution proposed in accordance with the invention the method is characterized in that as a viscous liquid, a liquid in which is dispersed particles of graphite. Thus, in a liquid bath of molten metal, the carbon can be fed with variable concentration, in particular in relatively high concentrations. Supply in this case again can be very simple, for example, by a pipeline of a fluid, which is along the butt joint and opens on the relative distance from the welding jet. Tubing for fluid can be thus made rigid to bending, so that it can simultaneously be used as a mechanical manipulator for conducting welding jet along the butt seam.

Applying a viscous fluid with at least one contributes to the strength of the element can be carried out separately in time from its own welding process by�icii processing independent of the welding device. Preferably the application of a viscous liquid, respectively, solid, powdery or similar aerosol substances, which/which contains at least one element which contributes to the strength of the weld, mainly carbon, but is carried out online, i.e. in the form of walking together, respectively, of a preceding processing in the welding installation. By applying the liquid near the point of work welded jet of viscous liquid can be fed reliably and fluid loss is prevented to a great extent.

In part directed inlet element that improves the strength, in a liquid bath of molten metal, and a small flow containing a fluid element further preferably, if according to a preferred execution of the proposed in the invention method, the liquid has a high viscosity or paste-like consistency. The kinematic viscosity of the fluid containing contributes to the strength of the element is in an ambient temperature of 20°C, for example at least 50×10-6m2/sec, preferably at least 100×10-6m /s, especially preferably at least 500×10 m2/S.

Another preferred execution proposed in accordance with the invention of the method provides that the liquid, respectively solid�e, powder or similar to the aerosol substance in terms of content in her/its carbon is selected and/or set so that the weld seam after abrupt cooling, heating to a temperature above the temperature of austenitization and repeated sudden cooling has a strength that is at least equal to, preferably at least above 100 MPa, particularly preferably at least above 200 MPa, than the strength of workpieces of sheet steel or steel bands, connected by welding.

In particular, this implies that viscous liquid, respectively, solid, powdery or similar aerosol substances in terms of content in her/its carbon is selected and/or set so that the weld seam after abrupt cooling, heating to a temperature above the temperature of austenitization and re-cooling has the strength that lies in the range from 1500 to 2000 MPa, preferably in the range from 1700 to 1900 MPa. Alternatively, can also be applied to the materials in the form of wire, but also powdery or similar aerosol substances, which are suitable mainly to increase the strength of the spin weld.

Other preferred and useful options proposed in the invention method, and it is also proposed in accordance with one�Britanie product of steel sheet are given in the dependent claims.

Brief description of the drawings

Below the invention is explained in more detail with reference to the accompanying drawings.

Where in the schematic picture show:

Fig.1 - a device for laser welding, a side view; and

Fig.2 - a device for laser welding and two coupled to each other billets from steel sheet in the perspective view.

The implementation of the invention

The drawing shows part of a welding machine for laser welding, namely the cross feed mechanism 1 for the focusing head 2 (processing head) and connected to the supply device 3 for applying a viscous, preferably having a high viscosity liquid, which contains at least one component which contributes to the strength of the spin-weld 10, preferably carbon. In the case of a liquid it is, for example, containing carbon fatty paste with high viscosity oil (mineral oil) or graphite dispersion. Graphite dispersion consists mainly of finely ground graphite is dispersed in the oil.

Oil, respectively, carbon-containing liquid is supplied through the conduit 4 for the fluid, which is located ahead of the working point (focus) 5 of the laser beam 6 in the direction of welding and goes to the butt seam 7, which is determined to be welding together became�governmental 8 sheets, 9. The conduit 4 for the fluid, mainly formed rigid to bending and simultaneously functions as a groping element respectively guiding element for directing laser beam 6 along the butt seam.

In the case be welded together steel sheets 8, 9 it is about the billets of steel sheet or steel tapes of different material quality or thickness of the sheet. They consist mainly of steel containing manganese and boron steel, for example of steel grade NV. This improved heat treatment of the steel after hot forming has excellent mechanical strength properties. Assembled from steel plates 8,9 product (Tailored Blank) then use hot pressure treatment is given to form a three-dimensional structural element, for example, sheet car door.

With the introduction of carbon and/or another element that contributes to the strength of the weld 10, in the form having a high viscosity liquids respectively over adjacent to each other of the cutting edges of the steel sheets 8, 9 in a liquid bath of molten metal directed primary structure is created, modified in its chemical composition in comparison with the structure of the material United steel sheets 8, 9. At the same time the molten weld metal p�mixed up with the help of application of the method of mixing gases. The altered primary structure of the weld seam 10 has after cooling (rapid cooling) in the laser welding process, heat in the process of hot forming to a temperature above the temperature of austenitization and final cooling at least identical in hardness, preferably a more rigid secondary structure than base metals, weld-connected. It's really like for final cooling during hot forming (direct hardening during compaction), and for indirect hot working pressure (mediated curing of the formation).

Oil, respectively, the carbon-containing fluid in terms of content in it/ its carbon is selected and/or set so that the weld seam 10 after abrupt cooling, heating to a temperature above the temperature of austenitization and re-cooling has the strength that lies in the range from 1500 to 2000 MPa, preferably in the range from 1700 to 1900 MPa.

In comparison with the billets of steel sheet or steel belts 8, 9 are connected by welding, the weld seam 10 after the abrupt cooling during the welding process, heating to a temperature above the temperature of austenitization and repeated rapid cooling is at least equal to, preferably, less�th least at 100 MPa, particularly preferably at least 200 MPa higher strength. For this, the mass fraction of carbon in the weld 10 is increased to from 0.25 to 0.40% by weight, preferably to from 0.30 to 0.40% by weight.

A partial increase of the carbon content in the weld 10 remains - provided that there is no re-conversion of the weld in the liquid state of the melt - in all subsequent stages of processing. Thus, due to the heat treatment of the weld seam 10 in this area is achieved, at least, identical in hardness, mostly firmer structure.

A higher offer carbon in the weld 10 respectively in certain areas of the weld austenite induces the formation to absorb from liquid molten phase more carbon, whereby the weld seam 10 respectively in a certain area of the laser weld seam for the growth of hardness is present in the carbon-enriched austenite, which translates into improved podcast.

In particular, during compaction the complex geometry of structural elements are determined structural data tools plastic deformation for obtaining a geometric circuit. In such cases, the critical region of the weld can aim legionaries higher carbon content, so, regardless of the geometric circuit and with it the cooling rate in the weld seam 10 to obtain a martensite structure. Also directed podolka areas of the weld, which in the finished structural element must identify sites of a given fracture, can be achieved using the proposed in accordance with the invention method. In the application proposed in the invention method can also determine the parameters of the weld areas, which because of special loads should have a particularly high strength. Using the proposed in accordance with the invention, there is also relatively favorable in cost methods (partial) combination of another set of properties of the weld 10.

The implementation of the invention is not limited to above described embodiments. On the contrary, there are many options that can be used also in the formation of the invention shown in the attached points of the invention. So, for example, also within the invention is a roller for applying high viscosity of the oil, respectively having a high viscosity containing liquid carbon instead of facing the butt joint of the pipeline 4 for the fluid. Similarly, it is possible to apply solids respectively poro�or similar crustacean leaves the aerosol substances, thanks to the characteristics and properties of the weld can be adjusted directionally in laser welding.

1. A method of manufacturing steel sheet products from billets of steel plates or steel strips of different thicknesses and/or materials, including welding of workpieces of sheet steel or steel bands to each other formed along their edges butt joint (7), characterized in that, before the welding process on at least one welded flange be welded to each other workpieces made of steel sheet or steel belts (8, 9) at least partially applied to the viscous fluid, in particular a paste or solid, powdery or similar aerosol substance, which/which contains at least one component which contributes to the strength of the weld (10), wherein the viscous liquid or solid, powdery or similar to the aerosol substance in terms of content in her/its carbon choose or set of conditions that weld after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength in the range from 1500 to 2000 MPa.

2. A method according to claim 1, characterized in that the viscous liquid or solid, powdery or similar to the aerosol substance in terms of content in her/its carbon or choose install from the�conditions, the weld seam after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength in the range from 1700 to 1900 MPa.

3. A method according to claim 1, characterized in that as a viscous liquid used oil, particularly a mineral oil and/or grease.

4. A method according to claim 1 or 3, characterized in that as a viscous liquid used for the liquid in which is dispersed particles of graphite.

5. A method according to claim 1 or 3, characterized in that through the use of a viscous liquid or solid, powdery or similar aerosol substances increase the mass fraction of carbon in the weld seam (10) to between 0.25 to 0.40% by weight, preferably to from 0.30 to 0.40% by weight.

6. A method according to claim 1 or 3, characterized in that the viscous liquid or solid, powdery or similar to the aerosol substance in terms of content in her/its carbon choose or set of conditions that the weld seam (10) after abrupt cooling, heating to a temperature above the temperature of austenization and repeated rapid cooling is at least identical in hardness, preferably a more rigid structure than United by welding workpiece of a steel sheet or steel belts (8, 9).

7. A method according to claim 1 or 3, characterized in that the viscous liquid or solid, poroshkoobraz�e or similar to the aerosol substance in terms of content in her/its carbon choose or set of conditions, the weld seam (10) after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength at least equal to or above, preferably at least 100 MPa, particularly preferably 200 MPa than the strength of the welded workpieces of sheet steel or steel belts (8, 9).

8. A method according to claim 1 or 3, characterized in that the welded together workpieces of sheet steel or steel belts (8, 9) using billets of steel containing manganese and boron.

9. A method according to claim 1 or 3, characterized in that the deposition of a viscous fluid is carried out in co-treatment along with welding.

10. A method according to claim 1 or 3, characterized in that welded to each other billets from steel plates or steel belts (8, 9) then, if necessary, after one or more scrap pressure treated by heat treatment to form a three-dimensional structural element.

11. A method according to claim 1 or 3, characterized in that the viscous liquid at an ambient temperature of 20°C has a kinematic viscosity of at least 50×10-6m2/sec, preferably at least 100×10-4m2/s, particularly preferably 500×10-4m2/S.

12. A method according to claim 6, characterized in that the welded drugs other workpieces made of steel sheet or steel belts (8, 9) apply billets of steel containing manganese and boron.

13. A method according to claim 7, characterized in that the welded together workpieces of sheet steel or steel belts (8, 9) using billets of steel containing manganese and boron.

14. A method according to claim 6, characterized in that welded to each other billets from steel plates or steel belts (8, 9) then, if necessary, after one or more scrap pressure treated by heat treatment to form a three-dimensional structural element.

15. A method according to claim 7, characterized in that welded to each other billets from steel plates or steel belts (8, 9) then, if necessary, after one or more scrap pressure treated by heat treatment to form a three-dimensional structural element.

16. A method according to claim 6, characterized in that the viscous liquid at an ambient temperature of 20°C has a kinematic viscosity of at least 50×10-6m2/sec, preferably at least 100×10-4m2/s, particularly preferably 500×10-4m2/S.

17. A method according to claim 7, characterized in that the viscous liquid at an ambient temperature of 20°C has a kinematic viscosity of at least 50×10-6m2/sec, preferably at least 100×10-4m2/with that person�but preferably 500×10 -4m2/S.

18. A method according to claim 1 or 3, characterized in that as a viscous liquid used for the liquid in which is dispersed particles of graphite, and through the use of a viscous liquid or solid, powdery or similar aerosol substances increase the mass fraction of carbon in the weld seam (10) to between 0.25 to 0.40% by weight, preferably to from 0.30 to 0.40% by weight.

19. A method according to claim 1 or 3, characterized in that through the use of a viscous liquid or solid, powdery or similar aerosol substances increase the mass fraction of carbon in the weld seam (10) to between 0.25 to 0.40% by weight, preferably to from 0.30 to 0.40% by weight and a viscous liquid or solid, powdery or similar to the aerosol substance in terms of content in her/its carbon choose or set of conditions that the weld seam (10), after quenching, heating to a temperature above the temperature of austenization and repeated rapid cooling is at least identical in hardness, preferably a more rigid structure than United by welding workpiece of a steel sheet or steel belts (8, 9).

20. A method according to claim 1 or 3, characterized in that through the use of a viscous liquid or solid, powdery or similar aerosol substances increase the mass fraction of carbon in the weld seam (10) to between 0.25 to 0.40% in�su, mostly from 0.30 to 0.40% by weight and a viscous liquid or solid, powdery or similar to the aerosol substance in terms of content in her/its carbon choose or set of conditions that the weld seam (10) after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength at least equal to or above, preferably at least 100 MPa, particularly preferably 200 MPa than the strength of the welded workpieces of sheet steel or steel belts (8, 9).

21. Sheet steel product for the manufacture of structural element using hot pressure treatment, collected from blanks in the form of steel plates or steel belts (8, 9) of different thickness and/or material welded together along the seam with the formation of the weld seam (10) with at least identical in hardness, preferably with a more solid structure than United by welding workpiece of a steel sheet or steel belts (8, 9), after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling and having a strength in the range from 1500 to 2000 MPa after abrupt cooling, heating to a temperature above the temperature of austenization and repeated rapid cooling.

22. The product according to claim 21,�causees, the weld seam (10) after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength in the range from 1700 to 1900 MPa.

23. The product according to claim 21 or 22, characterized in that the weld seam (10) after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength at least equal to or above, preferably at least 100 MPa, particularly preferably 200 MPa than the strength of the welded workpieces of sheet steel or steel belts (8, 9).

24. The product according to claim 21 or 22, characterized in that the weld seam (10) has a carbon content of at least 0.25 to 0.40% by weight, preferably at least 0.30 to 0.40% by weight.

25. The product according to claim 21 or 22, characterized in that welded to each other billets from steel plates or steel belts (8, 9) are the billets of steel containing manganese and boron.

26. The product according to claim 21 or 22, characterized in that the weld seam (10) has a carbon content of at least 0.25 to 0.40% by weight, preferably at least 0.30 to 0.40% by weight, welded together from billet steel sheet or steel belts (8, 9) are the billets of steel containing manganese and boron.

27. The product according to claim 21 or 22, wherein �the weld seam (10), after quenching, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength at least equal to or above, preferably at least 100 MPa, particularly preferably 200 MPa than the strength of the welded workpieces of sheet steel or steel belts (8, 9) welded to each other billets from steel plates or steel belts (8, 9) are the billets of steel containing manganese and boron.

28. The product according to claim 21 or 22, characterized in that the weld seam (10) has a carbon content of at least 0.25 to 0.40% by weight, preferably at least 0.30 to 0.40% by weight, wherein the weld seam (10) after abrupt cooling, heating to a temperature above the temperature of austenization and repeated sudden cooling has a strength at least equal to or above, preferably at least 100 MPa, particularly preferably 200 MPa, than the strength of the welded workpieces of sheet steel or steel belts (8, 9).



 

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13 cl, 5 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to welding of at least two components 102, 104 of super alloys. In compliance with this process, mail weld 110 if made with the use of the first filler metal arranged between said components 102, 104 and weld surface 112 with the use of second filler metal made over the main weld. Spacer 506 is fitted between said components provided with optional flute 105 made along the surface 114 of weld 102, 104. Filler wire 504 is fed over preset surface 114 or inside said optional flute 105. Two lasers 700, 702 or laser 600 with connected beam splitter 604 produce first and second laser beams 508, 510. Said beams are directed at focus points 5122, 514 spaced apart through preset spacing (509), for example, 0.05-1.5 cm. First laser beam 508 is used for making of the main weld 110 with the help of fist filler metal between components 102, 104. Second laser beam 510 is used for making of the surface weld 112 with the use of second filler metal on the surface of the main weld 110.

EFFECT: perfected method.

9 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of pipes by laser welding. Laser welding comprises emitting of two laser beams along edges at open pipe upper surface. Said laser beams are transmitted via different optical fibre glass and have focused spots of diameters making over 0.3 mm. Said laser beams are emitted so that front laser beam and rear laser beam are inclined to welding direction. Note here that incidence angles are defined relative to direction perpendicular to open pipe top surface. Front laser beam falls on open pipe top surface in welding direction before rear laser beam while the letter falls on open pipe top surface in welding direction after front laser beam. Front laser beam incidence angle is set larger than that of rear laser beam. Gap between front laser beam centre and that of rear laser beam is set at open pipe rear surface equal to 1 mm and more.

EFFECT: higher quality of weld, higher yield.

17 cl, 4 dwg, 3 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: temporary beads 3 and 4 are made on thick 2 and thin 1 parts. The bead 3 height is by 3-4 times higher than thickness of part 1. Height of bead 4 is equal to height of bead 3. Bead 4 thickness is determined by equation S2=(1+Δ)·S1. Beads 3 and 4 contact surface is treated by ultrasound in ethyl alcohol. Parts 1 and 2 are secured in welding fixture. Butt joint gap and beads 3 and 4 shift at least 10% of part 1 thickness are ensured. Laser beam 5 is directed to butt joint of beads 3 and 4.

EFFECT: invention increases weld strength due to rational design of the temporary beads.

3 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: device to manufacture items by layer-by-layer laser agglomeration of powders contains tanks for powder and powder surpluses, located between them module for item forming including table with drive of its vertical movement, device for powder supply to the table from powder tank, and powder discharge to power surpluses tank, optical laser system for agglomeration of the powder nozzles installed above the table for air or inert gas supply on the powder layer, and gas intake installed under the table with possibility of connection with vacuum system. The table is made gas permeable and is equipped with installed on its top surface of the refractory gas permeable plate intended for powder layer arrangement on its surface and agglomeration.

EFFECT: improved quality of obtained items.

1 dwg

FIELD: machine building.

SUBSTANCE: module comprises a guide belt, a movable orbital carriage mounted on the guide belt and able of travelling along it. The carriage includes a longitudinal movement drive and a moving device consisting of a carrying roller system and a gear wheel. A joint monitoring sensor, a welding wire reeling device and a handler are installed on the carriage. The handler consists of two mutually perpendicular linear guides with motors, which can move in respect to each other. The transverse linear guide is equipped by a laser welding head, a wire feeding unit, an arc welding torch, a video camera and a controller.

EFFECT: invention allows for the increase of productivity and efficiency of welding process for fixed ring pipe joints and for the improvement of welded joint quality.

3 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to low-inertia robot for laser cutting of flat sheets. Robot comprises support appliance (15) for laser cutting head (14) displacing in axes X and Y. Said support appliance is provided with two sliding units (5, 6) actuated by independent drives (7, 8). They serve for their displacement in axis Y to vary their mutual spacing while bars (9, 10) intended for swivelling said sliding units (5, 6) with laser cutting head (14).

EFFECT: higher quality of cutting.

4 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention can be used in aerospace engineering for production of sandwiched panels from titanium alloy VT-23. After preliminary annealing of filler sheets at 680°C and holding in air for 25 minutes said sheet blanks are stacked. Said sheets are locally interconnected by electric contact welding by several continuous perpendicular seams and stack is sealed all over its edges. Said stack is arranged between sheets of lining and heated to 875°C for shaping and welding of filler with lining by gas feed under pressure. Said preliminary annealing of filler sheets executed under above said conditions ups the stress velocity sensitivity index.

EFFECT: higher strength of finished products of titanium alloy.

2 dwg

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