CN218050773U - Welded joint of superposed steel plates and metal sandwich plate - Google Patents

Abstract

The utility model relates to a welding technology field of steel construction discloses a welded joint and a metal sandwich panel of superpose steel sheet, and it is little to have solved superpose steel sheet welding strength, and the big scheduling problem of the narrow and small space welding degree of difficulty. The technical scheme is that the steel plate comprises a first steel plate piece and a second steel plate piece, wherein the first steel plate piece and the second steel plate piece are overlapped or partially overlapped in the thickness direction; a closed welding cavity is formed in the overlapping area of the first steel plate piece, and the closed welding cavity divides the first steel plate piece into an inner plate and the rest outer plate which are positioned in the closed welding cavity; welding along the closed welding cavity to form a closed welding seam, and welding the inner plate, the outer plate and the second steel plate piece. The utility model discloses the work piece steel sheet thickness scope that is suitable for is wideer, the area is bigger, and welded joint fatigue resistance can be stronger, can realize the interior welding seam outer weld in narrow and small space or inner chamber space simultaneously.

Description

Welded joint of superposed steel plates and metal sandwich plate

Technical Field

The utility model relates to a welding technology field of steel construction especially relates to a welded joint of superpose steel sheet to and a metal sandwich panel.

Background

The steel structure is a structure mainly made of steel, is mainly a member made of profile steel, steel plates and the like, is light in self weight and simple and convenient to construct, and is widely applied to the fields of large buildings, bridges, venues, ships and the like.

The connection of the steel structure is mainly welding, bolt connection and riveting, wherein the welding connection accounts for the largest proportion. The steel members used for the structural members have the requirements on rigidity and strength performance for bearing various loads, so that certain requirements are imposed on the thickness of the steel plates, and the welding of the surface of the thicker steel plates, namely the connection of two layers of steel members or multiple layers of steel members overlapped in the thickness direction, is a difficult point in the welding of the steel structures.

Especially, the welding of the inner cavity, the narrow space and the welding space which is difficult to enter is particularly difficult. For example, a metal sandwich panel consists of two metal face sheets and a lightweight, relatively stiff core. The structure has light dead weight, low structural height and good integrity, increases virtual thickness compared with a single-layer plate, has good bending resistance, torsion resistance, shock resistance and energy absorption characteristics, has large bearing capacity, and is widely applied to the fields of steel bridge panels, ship floors and cabins, ocean platforms, buildings and the like. Because the connection position of core and panel is inboard, the welding degree of difficulty is big, even weld the robot through the welding, because the welding seam is in the inner chamber, follow-up difficult detection, maintenance.

One of the prior arts is to adopt the traditional plug welding, one of the steel plates is perforated, and the inner area of the hole is welded completely, but the welding has the disadvantage of small area, and if the surface welding of the welding interface adopts the solid welding with larger area, the area needs to be welded completely, so that the heat input is large, a heat-affected sensitive area with larger range is formed, and the filled welding seam is uneven. Secondly, the welding seam track of the small-area plug welding is single, the radial tracks of the welding seams welded in the holes are different when the welding seam is large in area, the defects are difficult to avoid due to the complex welding seam track, the welding seam is difficult to directly bear the complex force bearing requirements of all directions of load, the force bearing functions in multiple directions are difficult to form, and the welding seam is easy to crack or fatigue when the load which is not beneficial to the welding seam direction appears. Therefore, there are expressions in the related welding standards, i.e. general plug welding cannot be used for structural welding.

The second prior art adopts laser beam melting to combine the metal in the welding area to form a surface and a surface. Because the laser beam is focused, aligned and guided by an optical instrument, the laser beam needs to be placed at a proper distance from a workpiece, welding is limited by space, and the laser beam is only used for workshop welding processing of small-sized thin metal plates and precise workpieces with the thickness of less than 1.5 mm; secondly, the laser beam is usually focused on a small area, and melting thick metal plates is theoretically feasible, but is not practical in actual production and operation, and the equipment is expensive, so that the laser beam is not suitable for welding large steel structural members such as building bridges and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main objective is that the weld joint welding strength is little in order to solve superpose steel sheet, especially large-scale structure to and the difficult scheduling problem of narrow and small space welding, provide a welded structure intensity big, can be applicable to thick steel sheet welding and narrow and small space welded weld joint, and provide an adopt this weld joint's metal sandwich panel.

In order to achieve the above object, a first aspect of the present invention provides a welded joint of stacked steel plates, including a first steel plate member and a second steel plate member, the first steel plate member overlapping or partially overlapping with the second steel plate member in a thickness direction;

the first steel plate piece is provided with a closed welding cavity in the overlapping area, and the closed welding cavity divides the first steel plate piece into an inner plate and the rest outer plate which are positioned in the closed welding cavity;

welding along the closed welding cavity to form a closed welding seam, and welding the inner plate, the outer plate and the second steel plate piece.

Preferably, the closed welding cavity comprises at least one slit-shaped sub-welding cavity penetrating through the upper surface and the lower surface of the first steel plate element and at least one connecting rib connecting the inner plate and the outer plate, and a closed welding seam is formed after the sub-welding cavity is welded and the connecting rib is fused. The connecting rib not only can guarantee that inner panel and planking do not break away from when the unloading cutting in the closed weld chamber of first steel sheet spare is cut as temporary measure before welding, makes things convenient for follow-up transportation circulation, and inner panel, planking, second steel sheet spare three provide the location when being welded simultaneously, prevent that the inslot width in weld chamber that the inside and outside board skew brought is uneven, and cause welding quality to descend.

Because the end of the opening welding seam is a stress concentration point, in order to ensure that the connecting rib can be fused when welding, a closed welding seam is formed, the welding seam is prevented from becoming the opening welding seam with two ends and becoming a fatigue sensitive point, and as the optimization, the length t of the connecting rib is smaller than the groove width b of the closed welding cavity.

Preferably, the inner plate is provided with an inner welding cavity. Under the condition that the area of the inner plate is large, the inner plate is continuously grooved and welded, and the inner plate is continuously divided into a plurality of small areas, so that the welding strength is further increased.

Preferably, the inner weld chamber is in communication with the closed weld chamber.

Preferably, the inner solder cavity forms a continuous one-stroke curve with the closed solder cavity. Because the arc striking and the arc stopping of welding are parts with higher probability of defect occurrence, the inner welding cavity is communicated with the outer welding cavity, and a stroke graph is further formed, so that the number of the arc striking and the arc stopping of welding can be effectively reduced, and the occurrence of fatigue is reduced.

Preferably, the inner weld cavity is a helical wire with one end communicating with the closed weld cavity. And the circular stroke of the closed welding cavity enables the arc to be started and merged into a circular closed welding seam, the arc is hidden in the central area of the whole welding area through the spiral inner welding cavity, and the central area is a stress area which is least sensitive, so that the defect of arc closing is avoided.

Preferably, the inner welding cavity is a straight line or a curve, and two ends of the straight line or the curve are respectively communicated with the closed welding cavity. The welding seam track can be flexibly designed according to the actual welding or the workpiece structure.

Preferably, the first steel sheet member has a sheet thickness of 1.5mm or more in the overlapping region. Laser welding is often used for the sheet metal, does not need the metal that just can melt the panel at the panel fluting, the embodiment of the utility model provides a more be applicable to the welding of 1.5mm and above thick steel sheet.

Preferably, the closed weld chamber is circular, oval, or rectangular. The welding track is more designable.

The utility model discloses a metal sandwich plate is provided to another aspect, including the panel of two parallels, and set up the core between two panels, core and the laminating of panel inboard surface part, core and the regional foretell welded joint welded fastening that adopts of panel inboard surface part laminating, first steel sheet spare is the panel, second steel sheet spare is the core.

Preferably, the core plate is a corrugated plate.

Compared with the prior art, the utility model adopts the above technical scheme, has apparent technological effect:

1. the embodiment of the utility model provides a work piece steel sheet thickness scope that superpose steel sheet welded joint and welding method are suitable for is wideer, is particularly useful for the connection of thick steel sheet work pieces such as large-scale bridge, building. Through seting up closed welding chamber at first steel sheet spare, grooved mode forms the welding chamber promptly, again with second steel sheet spare welded connection, and the mode that needs the first steel sheet spare of melting with laser welding is different, the utility model discloses do not receive the restriction that the welding workpiece plate is thick, simultaneously, the welding of the traditional welding equipment of welded joint accessible of this patent embodiment and welding cost are lower, and economic performance is more excellent, more is applicable to the welding of the steel structure spare that bears the load.

2. From the atress, the embodiment of the utility model provides an overlap steel sheet welded joint and welding method more are applicable to the face welding of large tracts of land, high strength, and welded joint fatigue resistance can be stronger.

At first, it is different with the mode of traditional stopper weld hole internal filling welding material, the utility model discloses the inside interjacent inner panel that remains to be formed by the mother metal of welding seam, the shearing of mother metal, tensile and fatigue resistance can all be superior to the welding seam in the aspect of stability by a wide margin, by the mother metal as welding seam and welding seam smooth transition, avoid forming sectional sudden change between welding seam and welding seam, and directly shear by the welding seam when causing this connection area load, the situation of bending resistance biography power, can effectively improve the fatigue resistance ability of welding seam department.

Secondly, the utility model discloses welded joint has solved the problem of the one-way atress of plug welding or straight line welding, undertakes the functional requirement of each direction complicated operating mode. Because the plug welding or the straight line welding has good stress performance in one direction and poor stress performance in the other direction. In the plane of the welding area, the welding seam track can be flexibly designed according to factors such as the structure of a welding component, the required welding area, the local loads of different areas and the like, so that the welding seam extension in the longitudinal direction and the transverse direction is ensured, and all the forces can be taken into consideration.

3. The utility model discloses a form closed welding seam at closed welding chamber continuous welding, reduce welding arc starting point and receipts arc point quantity, avoid the arc starting point and receive the arc point many and the welding defect's that causes emergence probability, form similar girth welding's structure, welding seam intensity is more excellent.

4. The utility model discloses some spaces or high restriction when welded joint breaks through steel construction site operation can realize the outer welding of inner weld in narrow and small space or inner chamber space. Not only the welding difficulty is reduced, economic performance is better, and the welding seam quality is easy to detect.

Drawings

Fig. 1 is a schematic view of a welded joint of stacked steel plates according to embodiment 1 of the present invention before welding;

fig. 2 is a schematic view of a welded joint of stacked steel plates according to embodiment 1 of the present invention after welding;

FIG. 3 isbase:Sub>A cross-sectional view taken along A-A of FIG. 2;

fig. 4 is a schematic view of the closed welding chamber of embodiment 1 of the present invention with a connecting rib;

FIG. 5 is a schematic view of FIG. 4 after welding, wherein the tie-bars are melted during welding;

FIG. 6 is a schematic view of an inner plate with an inner welding cavity according to embodiment 1 of the present invention;

FIG. 7 is a schematic view of a weld chamber in another form of embodiment 1 of the present invention;

fig. 8 is a schematic structural view of the embodiment 1 of the present invention in which the closed welding chamber is rectangular;

fig. 9 is a schematic view of a metal sandwich plate according to embodiment 2 of the present invention.

Reference numerals: 1-first steel plate part, 11-inner plate, 12-outer plate, 2-second steel plate part, 3-closed welding cavity, 31-connecting rib, 32-sub welding cavity, 4-inner welding cavity, 5 and closed welding seam.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Example 1:

as shown in fig. 1 to 3, a welded joint of stacked steel plates. As shown in fig. 1, the steel plate comprises a first steel plate member 1 and a second steel plate member 2 made of steel plates, the first steel plate member 1 and the second steel plate member 2, and the first steel plate member 1 and the second steel plate member 2 are partially overlapped or overlapped in the plate thickness direction.

As shown in fig. 1, the first steel plate member 1 is provided with an annular groove penetrating the upper and lower surfaces of the steel plate to form a closed welding chamber 3, but the first steel plate member 1 and the second steel plate member 2 may be provided relatively, or may be provided on the second steel plate member 2, or may be provided on both surfaces thereof to enhance the welding strength. However, for some limited space, such as a cavity on one side or a space that is difficult to access, it should be opened as far as possible on the parts that are convenient for welding. The closed weld chamber 3 can be in the shape of a closed curve such as a circle, an ellipse, a rectangle, etc., and the closed weld chamber 3 shown in fig. 8 is a rectangle. The closed weld chamber 3 divides the first steel sheet piece 1 into an inner plate 11 and a remaining outer plate 12 located inside the closed weld chamber 3. The inner plate 11 is a residual material of the first steel plate part 1 formed during the cutting of the closed weld chamber 3, or may be formed by additional machining.

The closed welding chamber 3 can also be formed by a plurality of discontinuous sub-welding chambers 32 to form a closed welding path, as shown in fig. 4, the closed welding chamber 3 comprises a plurality of sub-welding chambers 32 and a plurality of connecting ribs 31 which penetrate through the upper surface and the lower surface of the first steel plate member 1, the sub-welding chambers 32 are in a narrow groove shape, the connecting ribs 31 connect the inner plate 11 and the outer plate 12, the inner plate 11 and the outer plate 12 are temporarily fixed before welding, the blanking cutting of the closed welding chamber 3 of the first steel plate member 1 can be guaranteed, the inner plate 11 and the outer plate 12 are not separated, meanwhile, the transportation and circulation of subsequent workpieces are convenient, two or more connecting ribs 31 are preferably adopted, and the closed welding path can be more stable.

During welding, welding is continuously performed along the track of the closed welding cavity 3, and fig. 2 and 3 are schematic diagrams of fig. 1, wherein a closed welding bead 5 is formed after continuous welding is performed in the closed welding cavity 3. As shown in fig. 5, which is a schematic view after welding in fig. 4, welding is continuously performed while the connecting rib 31 between the adjacent sub-welding cavities 32 is melted, and a continuous closed welding seam 5 is formed in the closed welding cavity 3. As shown in fig. 3, the connecting rib 31 is located between both ends of the adjacent sub-welding cavities 32, and if the length of the connecting rib is too wide, it is difficult to melt the connecting rib 31 and form a continuous closed weld, and an open weld having two ends is formed, and the ends become stress concentration regions and fatigue sensitive points. Therefore, the length t of the connecting rib 31 is ensured to be capable of melting the connecting rib 31 during welding, and through experimental demonstration, the length t of the connecting rib 31 is smaller than the groove width b of the closed welding cavity 3, during welding, continuous welding is performed along the track of the closed welding cavity 3, the connecting rib is melted, and a closed welding seam 5 is formed in the closed welding cavity 3. The closed weld 5 connects the inner plate 11, the outer plate 12 and the second steel sheet piece 2 by welding.

Meanwhile, in the welding process, the connecting ribs 31 provide positioning for the inner plate 11, the outer plate 12 and the second steel plate piece during welding, the relative positions of the inner plate 11 and the outer plate 12 are guaranteed, the inner plate 11 is prevented from shifting to cause uneven groove width of a welding cavity, the cross sections of generated welding seams are not uniform, and welding quality is reduced.

The manufacturing of the welded joint of the present embodiment specifically includes the following process steps:

firstly, blanking, namely cutting a first steel plate piece 1 into a closed welding cavity 3, wherein the closed welding cavity 3 divides the first steel plate piece 1 into an inner plate 11 and a residual outer plate 12 which are positioned radially inside the closed welding cavity 3;

the first steel plate member 1 and the second steel plate member 2 are attached to each other, the first steel plate member and the second steel plate member are overlapped or partially overlapped, and the inner plate 11 and the closed welding cavity 3 are positioned in an overlapped area;

and continuously welding in the closed welding cavity 3 along the track of the closed welding cavity to form a closed welding seam 5, and fixedly connecting the inner plate 11, the outer plate 12 and the second steel plate piece 2.

Above-mentioned superpose steel sheet welded joint, contrast laser welding, this application more is applicable to the welding that is used for bearing the structure of load, is particularly useful for the large-scale steel structure spare of building, bridge, boats and ships etc. like decking, building carrier plate, ship storehouse etc.. The laser welding is through the mode of non-contact, and direct molten steel board, its welding bead width, the thickness of welding workpiece and working space receive the restriction of laser source and equipment, are often used for the sheet metal, and the welding joint accessible traditional welding equipment welding of this patent embodiment 1 and welding cost are lower, and economic performance is more excellent, and the fluting makes the steel sheet thickness range that is applicable bigger, is particularly useful for the connection of the thick steel sheet of thick more than or equal to 1.5mm of thick board.

Simultaneously, for traditional modes such as plug welding, this application is more applicable to the face welding of large tracts of land, through keeping the interior intermediate inner panel 11 of closed welding seam 5, as welding seam and welding seam smooth transition, avoid forming the sudden change of section between the welding seam, directly pass through the situation of shearing, bending resistance power transmission by the welding seam when causing the strength, because the power transmission of shearing, bending resistance is generally less than tensile or resistance to compression, and the section sudden deformation can more obvious fatigue factor of ability, the intermediate inner panel that remains in the welding seam and is formed by the base metal can effectively improve the fatigue resistance ability of welding seam department, undertake the functional requirement of each direction complicated operating mode.

In the plane of a welding area, the welding seam track can be flexibly designed according to factors such as the structure of a welding component, the required welding area, the local loads of different areas and the like, the designability is stronger, the extension of the welding seam in the longitudinal direction and the transverse direction is ensured, the problems of good stress performance in one direction and poor stress in the other direction of plug welding or linear welding are effectively solved, and all directions of stress can be taken into consideration.

As shown in figure 2, a closed welding seam 5 is formed in the closed welding cavity 3 through continuous welding to form a structure similar to girth welding, a welding arc starting point and a welding arc ending point are welding defect frequency generation points, the welding arc starting point and the welding arc ending point are overlapped through the closed welding seam 5, and the welding seam strength is higher.

When the area of the inner panel 11 is large, the groove is continuously formed in the inner panel 11 and the inner panel 11 is continuously divided into a plurality of small regions, thereby further increasing the welding strength. As shown in fig. 6, various forms of inner weld cavities may be opened on the inner panel 4 to increase the welding area, thereby increasing the welding strength. The inner weld chamber 4 communicates with the closed weld chamber 3. Preferably, the path curve of the inner solder chamber 4 can form a continuous one-stroke curve with the closed solder chamber 3. Because the arc striking and the arc closing of welding are parts with higher probability of defect occurrence, the inner welding cavity 4 is communicated with the outer welding cavity 3, and a stroke graph is further formed, so that the number of the arc striking and the arc closing of the welding can be effectively reduced, and the occurrence of fatigue is reduced. The inner weld cavity shown in fig. 6 is a helical wire. The circular stroke of the closed welding cavity 3 enables the arc to be started and merged into a circular closed welding seam, the arc is hidden in the central area of the whole welding area through the spiral inner welding cavity 4, the central area is the least sensitive stressed area, and the defect of arc closing is avoided.

Of course, the inner weld chamber 4 may not form a drawn curve with the closed weld chamber, and as shown in fig. 7, the two ends of the drawn curve are respectively connected to the closed weld chamber 3.

Example 2:

the embodiment 2 of the utility model provides a metal sandwich plate is used for metal sandwich plate welded particular case for embodiment 1's welded joint, realizes that the inner weld in the narrow and small space of metal sandwich plate or inner chamber space welds outward. As shown in fig. 9, a metal sandwich plate comprises two parallel panels and a core plate arranged between the two panels, wherein the core plate is a corrugated plate and has straight wave crests and wave troughs, and the wave crests and the wave troughs are attached to the inner surface of the panel.

As shown in fig. 9, when the sandwich panel is assembled, the welding seam connecting one surface of the upper panel and the lower panel can be directly welded, and the other surface cannot be welded because the upper panel is covered. The one side that can not obviously weld adopts embodiment 1's welded joint, and wherein this panel is as first steel sheet spare 1, and the core is as second steel sheet spare 2, offers a plurality of closed weld chambers on the panel and welds, forms a plurality of closed welding seams 5, shifts the interior welding seam in narrow and small space to the outside, realizes the effect that the interior seam was welded outward, and the welding degree of difficulty reduces, and the welding seam quality detects easily simultaneously to and the maintenance in later stage.

Meanwhile, during combination, in the actual working environment of the metal sandwich plate, the weld joint in the tension area is welded clearly, and the weld joint in the compression area is welded by the welding method, so that the structural requirement can be met.

The above is the preferred embodiment of the present invention, and those skilled in the art can make several modifications and improvements without departing from the principle of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims (12)

1. A welded joint of superposed steel plates, comprising a first steel plate element (1) and a second steel plate element (2), said first steel plate element (1) overlapping or partially overlapping in the thickness direction with respect to the second steel plate element (2), characterized in that:

the first steel plate piece (1) is provided with a closed welding cavity (3) in an overlapping area, and the closed welding cavity (3) divides the first steel plate piece (1) into an inner plate (11) and a residual outer plate (12) which are positioned in the closed welding cavity (3);

welding along the closed welding cavity (3) to form a closed welding seam (5), wherein the inner plate (11), the outer plate (12) and the second steel plate piece (2) are connected in a welding mode.

2. The welded joint of stacked steel plates according to claim 1, wherein:

the closed welding cavity (3) comprises at least one narrow-groove-shaped sub-welding cavity (32) penetrating through the upper surface and the lower surface of the first steel plate piece (1) and at least one connecting rib (31) connecting the inner plate (11) and the outer plate (12), and a closed welding seam (5) is formed after the sub-welding cavity (32) is welded and the connecting rib (31) is fused.

3. The welded joint of stacked steel plates according to claim 2, wherein: the length t of the connecting rib (31) is less than the groove width b of the closed welding cavity (3).

4. The welded joint of stacked steel plates according to claim 1, wherein: an inner welding cavity (4) is arranged on the inner plate (11).

5. The welded joint of stacked steel plates according to claim 4, wherein: the inner welding cavity (4) is communicated with the closed welding cavity (3).

6. The welded joint of stacked steel plates according to claim 4, wherein: the inner welding cavity (4) and the closed welding cavity (3) form a continuous one-stroke curve.

7. The welded joint of stacked steel plates according to claim 4, wherein: the inner welding cavity (4) is a spiral line with one end communicated with the closed welding cavity (3).

8. The welded joint of stacked steel plates according to claim 4, wherein: the inner welding cavity (4) is a straight line or a curve of which two ends are respectively communicated with the closed welding cavity (3).

9. The welded joint of stacked steel plates according to claim 1, wherein: the thickness of the first steel plate (1) in the overlapping area is larger than or equal to 1.5mm.

10. The welded joint of stacked steel plates according to claim 1, wherein: the closed welding cavity (3) is circular, oval or rectangular.

11. The utility model provides a metal sandwich panel, includes two parallel panels, and sets up the core between two panels, the core is laminated with panel inside surface part, its characterized in that: the joint area of the core plate and the inner side surface part of the panel is welded and fixed by the welding joint of any one of claims 1 to 10, the first steel plate piece (1) is the panel, and the second steel plate piece (2) is the core plate.

12. The metal sandwich panel of claim 11 wherein: the core plate is a corrugated plate.

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