CN115213562A - Laser stitch welding thin plate welding process - Google Patents

Abstract

The invention discloses a laser stitch welding thin plate welding process, which comprises the following steps: (1) moving the movable support upwards and outwards extending out of the abdicating groove; (2) Driving the workpiece to move to an initial welding position through a feeding device; (3) Moving the movable support part downwards and inwards retracting in the abdicating groove so as to move the workpiece downwards until the workpiece is placed on the platform; (4) moving the pressing piece downwards to tightly press the pressing piece on the top of the workpiece; (5) Welding the workpiece by a welding gun, wherein the welding part of the workpiece is over against the concave part of the workbench; (6) After welding a step length area, moving the pressing piece upwards, and simultaneously moving the movable supporting piece upwards and outwards to the abdicating groove; (7) driving the workpiece to move by one step through the feeding device; (8) And (5) repeating the steps (3) to (7) until the workpieces are completely welded. Compared with the prior art, the laser stitch welding thin plate welding process can avoid the adhesion of the workpiece and the platform during the penetration welding and avoid the mutual scratch between the workpiece and the platform during the feeding of the workpiece.

Description

A laser stitch welding sheet welding process

technical field

The invention relates to the technical field of laser welding, in particular to a laser stitch welding thin plate welding process.

Background technique

After two equal-thickness thin plates (the plate thickness is usually 1-2mm) are stacked, the laser welding method can be used for stacking welding. The shape of the weld is mostly circular, the circle is arranged in a square or an equilateral triangle, and the periphery of the two thin plates is directly welded. The seam is sealed to form a closed space, and the closed space is pressurized to inflate the space between the surrounding straight welding seams and the circular welding seams, so that the two sheets after welding form a honeycomb shape, which is called laser welding bulging forming honeycomb panels.

Laser welding inflated honeycomb panels are referred to as honeycomb panels. The honeycomb panels are equipped with inlets and outlets to become heat transfer elements. When in use, a fluid flows into the honeycomb cavity (space in the board) from the inlet, and flows around the honeycomb points in the cavity. The outlet flows out, and another fluid flows outside the plate, so as to realize the heat exchange between the two fluids inside and outside the plate, so the basic purpose of this honeycomb plate is as a heat transfer element. For details, please refer to the Chinese utility model patent "Built-in Laser Welding Heat Transfer Jacket Structure" filed by the applicant with the patent application number CN200420037437.4 (publication number CN2750279Y) and the patent application number CN201310151188.5 (publication number: CN104120053A) Chinese invention patent "a honeycomb jacketed fermentation tank".

After two equal-thickness thin plates are stacked, when the laser welding method is used for stacking welding, there are two ways of stacking the welding seam:

One is that the weld does not penetrate through, that is, the depth of the weld pool is less than the sum of the thicknesses of the two plates, and the penetrating weld cannot be seen on the back of the lower plate of the two plates. Its advantages are: on the one hand, because there is no welding penetration, the back of the lower plate is smooth, and solid objects in the fluid will not be caught when used; The surface of the welding machine worktable will not be adhered to the lower plate, and the surface of the worktable will remain smooth. The disadvantage of this welding method is that the width of the molten pool is small and the depth of the molten pool is shallow, so the weld strength is poor.

Another stitch welding method is to weld both thin plates through, that is, the depth of the weld pool is equal to the sum of the thicknesses of the two plates, and the penetrating weld can be seen on the back of the lower plate of the two plates. The advantages of this welding method are that the width of the molten pool and the depth of the molten pool of this welding method are large, so the weld strength is good. The disadvantage is that: on the one hand, due to the welding penetration, the welding seam on the back of the lower plate is not smooth and has burrs, which will cause solid objects in the fluid to hang during use; The surface of the worktable of the laser welding machine is easy to adhere to the workpiece, the surface of the worktable is not smooth, and the workpiece (two sheet assembly) will damage each other's surface when moving on the worktable.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a laser stitch welding thin plate welding process that can avoid the workpiece from sticking to the platform during penetration and avoid scratches with the platform when the workpiece is fed.

The second technical problem to be solved by the present invention is to provide a laser stitch welding thin plate welding process that can ensure smooth surface of the welding seam.

The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a laser stitch welding thin plate welding process, wherein two thin plates are welded as workpieces by a laser stitch welding thin plate welding device, which is characterized in that:

The laser stitch welding sheet welding includes:

a workbench, the top surface has a concave part corresponding to the welding part of the workpiece;

Two sets of pressing devices are located on the left and right sides of the workbench respectively. Each set of pressing devices includes a fixed support piece, a movable support piece and a pressing piece. The top surface of the fixed support piece is the same as the top surface of the workbench. Basically on the same horizontal plane, they together form a platform for the workpiece to rest. The fixed support is provided with a relinquishment slot with an opening at the top, and the movable support can move up and down from the opening at the top of the relinquishment slot. a position slot, and the pressing member is installed just above the fixed support in a manner that can move up and down relative to the fixed support;

a welding torch, located directly above the workbench; and

Feeding device, used to drive the workpiece to move from right to left;

The laser stitch welding sheet welding process includes the following steps:

(1) Move the movable support upwards and extend it to the abdication slot;

(2) Drive the workpiece to move from right to left to the initial welding position through the feeding device;

(3) Move the movable support down and shrink it in the abdication groove, so that the workpiece is moved down until it rests on the platform;

(4) Move the pressing member down and press it tightly on the top of the workpiece, so that the two thin plates are close to each other;

(5) Weld the workpiece through the welding torch, and the welding part of the workpiece is facing the depression of the worktable;

(6) After welding a step area, move the pressing piece up, and at the same time move the movable support up and extend out of the abdication groove, so that the workpiece can be moved up and off the platform;

(7) Drive the workpiece to move one step from right to left through the feeding device;

(8) Repeat steps (3) to (7) until all the workpieces are welded.

In order to further solve the above-mentioned second technical problem, the inside of the workbench has a cavity for accommodating protective gas, and the workbench has an air intake hole and an exhaust hole that communicate with the cavity. The vent hole is located on the inner wall of the depression;

In step (4), before welding, the shielding gas is introduced into the cavity from the air inlet hole, so that the shielding gas is discharged through the exhaust hole, and then the welding is completed.

In order to ensure that the shielding gas fills the concave part uniformly, the number of the exhaust holes is at least two, and they are arranged on the bottom wall inside the concave part at intervals.

In order to facilitate the processing of the workbench, the workbench includes:

a base having said cavity inside and an opening at the top; and

The welding template covers the top opening of the base, and the surface has the depression.

In order to facilitate the replacement of different welding templates, the welding template is detachably mounted on the base.

In order to reduce the frictional force between the workpiece and the movable support and avoid mutual scratches with the workpiece, the movable support includes a lift seat and a roller rotatably connected to the top of the lift seat.

In order to facilitate the lifting and lowering of the lifting seat, a first driving member is installed on the fixed support, and the power output end of the first driving member is drivingly connected with the lifting seat to drive the lifting seat to rise and fall.

In order to flatten the just-welded step area in time, the position of the worktable is recorded as the welding position, and the position of the pressing device on the left side of the worktable is recorded as the flattening position, step ( 5), in the two adjacent step regions of the workpiece, the latter step region is located in the state of the welding position, and the previous step region is located in the flattening position and sandwiched between the corresponding fixed support and the pressing piece. .

In order to facilitate the leveling of the workpiece, the opposite surfaces of the fixed support and the pressing member are substantially horizontal.

In order to realize the feeding of the workpiece, the feeding device includes two pairs of idlers respectively located on the left and right sides of the platform.

Compared with the prior art, the advantages of the present invention are:

First, when the workpiece is welded, the roller is in a low position, the top surface of the roller is not higher than the top surface of the fixed support, the workpiece is placed on the platform, and the pressing piece is pressed against the top of the workpiece, so that the two sheets are close to each other. It is convenient for welding operation. After welding a step area, move the tightening piece up, and at the same time, the roller moves to a high position to lift the workpiece and leave the platform. When there are sharp burrs but raised welds, since the workpiece is lifted up without touching the platform, the workpiece and the top surface of the workbench and the fixed support will not be pulled each other, thus protecting the top surface of the workbench and the fixed support. It also prevents the back of the workpiece from being damaged;

Second, welding will cause the workpiece to roll up and deform, and each step of welding will produce a deformation, and many steps will accumulate to form a total roll-up deformation. This deformation makes welding impossible, and the clamping device can make each The workpiece in the welding step area is flattened, so that the workpiece in this area is welded in a flat state to ensure stable welding and reliable quality;

Third, during welding, the welding part of the workpiece is facing the recessed part of the worktable, which can prevent the workpiece from being welded together with the welding template during penetration.

Description of drawings

1 is a schematic structural diagram of an embodiment of the laser stitch welding thin plate welding device of the present invention in a first state;

FIG. 2 is a schematic structural diagram after switching to the second state in FIG. 1;

Fig. 3 is the left side view of the workbench in Fig. 1;

Fig. 4 is the top view of the welding template in Fig. 3;

Fig. 5 is an enlarged view of the platform portion in Fig. 1;

6 is a top view of a laser-welded bulging-formed honeycomb panel prepared by an embodiment of the laser stitch welding thin-plate welding device of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings.

As shown in FIG. 1 to FIG. 6, it is a preferred embodiment of the laser stitch welding thin plate welding device of the present invention. The laser stitch welding thin plate welding device is used for welding two thin plates as workpieces a, and includes a frame 10 , a worktable 1 mounted on the frame 10 , a pressing device 2 , a welding gun 3 and a feeding device 4 .

The workbench 1 includes a base 11 and a welding template 12 . Specifically, as shown in FIG. 3 , the interior of the base 11 has a cavity 111 for accommodating the protective gas, the top has an opening, and the front and rear sides of the base 11 are respectively provided with an air inlet 112 communicating with the cavity 111; The welding template 12 is detachably installed on the base 11 and covers the top opening of the base 11. As shown in FIG. 4 , the upper surface of the welding template 12 is partially recessed downward to form a depression 121, and the bottom wall of the depression 121 is formed on the bottom wall of the depression 121. At least two exhaust holes 122 communicating with the cavity 111 are arranged at intervals. In this embodiment, the surface of the welding template 12 is substantially rectangular, its length is slightly longer than the width of the workpiece a, and its width is slightly wider than the step length of the workpiece a for one welding. The welding template 12 is designed according to the requirements of the workpiece. The concave portion 121 corresponds to the welding portion of the workpiece a (ie the welding ring a1 and the welding line a2, etc.) Different diameters of welding rings of workpiece a, different center distances of welding rings, different arrangements of welding rings, and different widths of workpiece a. The type, composition and pressure of the protective gas introduced into the cavity 111 can be adjusted to suit and meet the different requirements of different occasions.

The number of pressing devices 2 is two groups, which are located on the left and right sides of the workbench 1 respectively. Two driving parts (not shown in the figure), the area of the workpiece a between the two groups of pressing devices 2 is the welding area, usually 1 to 3 rows of circles and closed straight lines on both sides can be welded. Specifically, as shown in FIG. 5 , the top surface of the fixed support 21 and the top surface of the workbench 1 (ie, the upper surface of the welding template 12 ) are substantially at the same level, and together form a platform b for the workpiece a to rest on; the fixed support 21 is provided with a relinquishment slot 211 with an opening at the top; the movable support 22 can move up and down from the opening at the top of the relinquishment slot 211 into and out of the relinquishment slot 211, including a lift seat 221 and a rotatable connection on the top of the lift seat 221. The roller 222, the roller 222 is made of nylon or other non-metallic materials; the pressing member 23 is installed directly above the fixed support 21 in a manner that can move up and down relative to the fixed support 21; the first driving member 24 is a cylinder, which is installed on the On the side of the fixed support member 21, the power output end of the power output end is connected with the lifting seat 221 to drive the lifting seat 221 to rise and fall; Piece 23 is raised and lowered. In addition, the opposite surfaces of the fixed support member 21 and the pressing member 23 are substantially horizontal.

The welding torch 3 is located directly above the workbench 1 .

The feeding device 4 is used to drive the workpiece a to move from right to left, and includes two pairs of idlers 41 respectively located on the left and right sides of the platform b. Specifically, each pair of idler rollers 41 is composed of several rollers, and the surfaces of the rollers are made of soft materials. The idler rollers 41 can drive the workpiece a to feed on the one hand, and can play an auxiliary supporting role for the workpiece a on the other hand.

The above-mentioned laser stitch welding thin plate welding device has at least two states:

In the first state, as shown in FIG. 1 , the movable support 22 is retracted in the recess 211, the top surface of the roller 222 is not higher than the top surface of the fixed support 21, the workpiece a rests on the platform b, and the workpiece The welding part of a is facing the concave part 121, and the pressing member 23 is pressed against the top of the workpiece a, so that the two thin plates are in close contact with each other; The position of the pressing device 2 on the side is recorded as the flattening position. In the first state, in the two adjacent step regions of the workpiece a, when the latter step region is located at the welding position, the former step region is in the pressing position. Flat position and sandwiched between the corresponding fixed support member 21 and the pressing member 23;

In the second state, as shown in FIG. 2 , the movable support 22 protrudes out of the abdication groove 211 , the top surface of the roller 222 is higher than the top surface of the fixed support 21 by about 5 mm, the pressing member 23 is separated from the workpiece a, and It is higher than the top surface of the roller 222 so that the workpiece a is separated from the platform b. During the feeding process, the workpiece a is in rolling contact with the roller 222 .

The welding process of the above-mentioned laser stitch welding thin plate welding device includes the following steps:

(1) Move the movable support 22 up and extend out to the vacant slot 211, and the laser stitch welding thin plate welding device is in the second state;

(2) Drive the workpiece a to move from right to left to the initial welding position through the feeding device 4;

(3) moving the movable support 22 down and shrinking it in the relinquishment groove 211, so that the workpiece a is moved down until it rests on the platform b;

(4) The pressing member 23 is moved down and pressed tightly on the top of the workpiece a, so that the two sheets are in close contact with each other, and the laser stitch welding sheet welding device is in the first state;

(5) Pass the shielding gas into the cavity 111 from the air inlet 112, so that the shielding gas is discharged through the exhaust hole 122, and then weld the workpiece a through the welding torch 3, and the welding part of the workpiece a is facing the depression of the table 1. section 121;

(6) After welding a step-length area, move the pressing member 23 up, and at the same time move the movable support 22 up and extend out of the relinquishment groove 211, so that the workpiece a is moved up and separated from the platform b, and the thin plate is welded by laser stitching. The welding device is in the second state;

(7) Drive workpiece a to move one step from right to left by feeding device 4;

(8) Steps (3) to (7) are repeated until all the workpieces a are welded, and the laser-welded bulging honeycomb panel as shown in FIG. 6 is obtained.

The advantages of this embodiment are:

(1) By arranging the recessed portion 121 corresponding to the welding portion of the workpiece a on the top surface of the worktable 1, it can be avoided that the workpiece a is welded together with the welding template 12 during penetration;

(2) By providing protective gas to fill the depression 121 and contact with the back of the workpiece a, it can protect the back welding seam after the penetration of the workpiece a, prevent the back welding seam from being oxidized, and ensure that the welding seam surface is smooth and free of burrs;

(3) There are two main functions of the pressing device 2:

First, when the workpiece a is welded, the roller 222 is in a low position, the top surface of the roller 222 is not higher than the top surface of the fixed support 21, the workpiece a rests on the platform b, and the pressing member 23 is pressed on the top of the workpiece a to Make the two thin plates close to each other to facilitate the welding operation. After welding a step area, move the tightening piece 23 up, and at the same time, the roller 222 moves to a high position to lift the workpiece a and leave the platform b. The workpiece a is in the roller 222 Step in the jacked-up state, so that although there is no sharp burr on the back of the welding seam of workpiece a, but there is a raised seam, since workpiece a is jacked up and does not contact platform b, workpiece a and the top of table 1 and fixed support 21 The surfaces will not be pulled from each other, thus protecting the top surface of the table 1 and the fixed support 21, and also preventing the back surface of the workpiece a from being damaged;

Second, the welding will cause the workpiece a to be rolled up and deformed, and each step of welding will produce a deformation, and many steps are accumulated to form a total roll-up deformation. This deformation makes the welding impossible, and the clamping device 2 can The workpiece a in each welding step area is flattened, so that the workpiece a in this area is welded in a flat state to ensure stable welding and reliable quality.

Claims (10)

1. The utility model provides a laser stitch welding sheet metal welding process, welds two sheets as work piece (a) through laser stitch welding sheet metal welding set which characterized in that:

the laser stitch welding thin plate welding comprises

A table (1) having a recessed portion (121) on a top surface thereof corresponding to a welded portion of the work (a);

the two groups of pressing devices (2) are respectively positioned at the left side and the right side of the workbench (1), each group of pressing devices (2) comprises a fixed supporting piece (21), a movable supporting piece (22) and a pressing piece (23), the top surface of the fixed supporting piece (21) and the top surface of the workbench (1) are basically in the same horizontal plane to form a platform (b) for placing a workpiece (a) together, the fixed supporting piece (21) is provided with an abdicating groove (211) with an opening at the top, the movable supporting piece (22) can movably pass in and out of the abdicating groove (211) from the opening at the top of the abdicating groove (211) up and down, and the pressing piece (23) is arranged right above the fixed supporting piece (21) in a mode of being capable of moving up and down relative to the fixed supporting piece (21);

the welding gun (3) is positioned right above the workbench (1); and

the feeding device (4) is used for driving the workpiece (a) to move from right to left;

the laser stitch welding thin plate welding process comprises the following steps:

(1) Moving the movable support (22) upwards and outwards to the abdicating groove (211);

(2) The workpiece (a) is driven to move to the initial welding position from right to left by the feeding device (4);

(3) Moving the movable support (22) downwards and retracting in the yielding groove (211) so as to move the workpiece (a) downwards until the workpiece is rested on the platform (b);

(4) The pressing piece (23) is moved downwards and pressed on the top of the workpiece (a) so as to enable the two thin plates to be attached to each other;

(5) Welding the workpiece (a) by the welding gun (3), wherein the welding part of the workpiece (a) is just opposite to the concave part (121) of the workbench (1);

(6) After welding a step area, moving the pressing piece (23) upwards, and simultaneously moving the movable supporting piece (22) upwards and outwards to the yielding groove (211) so as to move the workpiece (a) upwards to be separated from the platform (b);

(7) The workpiece (a) is driven to move one step length from right to left through the feeding device (4);

(8) And (5) repeating the steps (3) to (7) until the workpieces (a) are completely welded.

2. The laser stitch welding sheet welding process according to claim 1, characterized in that: a cavity (111) for accommodating protective gas is formed in the workbench (1), an air inlet hole (112) and an air outlet hole (122) which are communicated with the cavity (111) are formed in the workbench (1), and the air outlet hole (122) is positioned on the inner wall of the recessed part (121);

in the step (4), before welding, introducing protective gas from the gas inlet hole (112) into the cavity (111) so that the protective gas is discharged through the gas outlet hole (122), and then completing welding.

3. The laser stitch welding sheet welding process according to claim 2, characterized in that: the number of the exhaust holes (122) is at least two, and the exhaust holes are arranged on the bottom wall inside the concave part (121) at intervals.

4. The laser stitch welding sheet welding process according to claim 2, characterized in that: the working table (1) comprises

A base (11) internally provided with the cavity (111) and provided with an opening at the top; and

and the welding template (12) covers the top opening of the base (11), and the surface of the welding template is provided with the concave part (121).

5. The laser stitch welding sheet welding process as defined in claim 4, wherein: the welding template (12) is detachably arranged on the base (11).

6. The laser stitch welding sheet welding process as set forth in claim 1, wherein: the movable supporting piece (22) comprises a lifting seat (221) and a roller (222) which is rotatably connected to the top of the lifting seat (221).

7. The laser stitch welding sheet welding process according to claim 6, wherein: the fixed supporting piece (21) is provided with a first driving piece (24), and the power output end of the first driving piece (24) is in transmission connection with the lifting seat (221) and used for driving the lifting seat (221) to lift.

8. The laser stitch welding sheet welding process as set forth in claim 1, wherein: recording the position of the workbench (1) as a welding position, recording the position of the pressing device (2) on the left side of the workbench (1) as a flattening position, and in the step (5), in two adjacent step areas of the workpiece (a), the next step area is positioned at the welding position, and the previous step area is positioned at the flattening position and clamped between the corresponding fixed support member (21) and the pressing member (23).

9. The laser stitch welding sheet welding process according to claim 8, wherein: the opposite faces of the fixed support member (21) and the pressing member (23) are substantially horizontal.

10. A laser stitch welding sheet welding process according to any one of claims 1 to 9, characterized in that: the feeding device (4) comprises two pairs of carrier rollers (41) which are respectively positioned at the left side and the right side of the platform (b).

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