CN113523535B

CN113523535B - Friction stir welding T-shaped joint clamp with auxiliary heat

Info

Publication number: CN113523535B
Application number: CN202110848413.5A
Authority: CN
Inventors: 芦笙; 朱涵文; 卫成刚; 王泽鑫; 彭金华; 杨代立; 姚增健; 陈靓瑜; 臧千昊
Original assignee: Jiangsu University of Science and Technology
Current assignee: Jiangsu University of Science and Technology
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2023-06-20
Anticipated expiration: 2041-07-27
Also published as: CN113523535A

Abstract

The invention discloses a friction stir welding T-shaped joint clamp with auxiliary heat, which comprises two side backing plates, a bottom backing plate, a heating device and a pressing plate module, wherein the two side backing plates are symmetrical about the center of a welding line, a vertical test plate to be welded is clamped in the middle, a heating copper block is tightly attached to the vertical test plate to be welded on one side of the two side backing plates, a wedging block is tightly attached to the other side of the heating copper block, the surfaces of the two side backing plates are horizontal test plates to be welded, the bottom of the bottom backing plate is connected with the bottom backing plate to limit the vertical test plate to be welded, the pressing plate module is pressed on the horizontal test plate to be welded and clamped through a workbench, and the welding is completed after the surface of the test plate is heated to a certain temperature by connecting an MCH. The invention can realize bottom heating and local heating, can effectively optimize the temperature field, reduce the welding defect of the T-shaped joint, and has good flexibility and applicability.

Description

Friction stir welding T-shaped joint clamp with auxiliary heat

Technical Field

The invention relates to a welding fixture, in particular to a friction stir welding T-shaped joint fixture with auxiliary heat.

Background

Friction stir welding is a material solid phase connection technology, and the FSW technology is environment-friendly, free of splash, free of air holes and arc light, but has higher clamping requirements on equipment and welding plates, and the T-shaped joint friction stir welding has special clamping requirements.

For FSW technology, the welding temperature field is directly related to the flow of materials and the weld joint structure, generally, the surface temperature of the weld joint of friction stir welding is high, the bottom temperature is low, the flow of the bottom material is not smooth, bottom defects are easily caused, in FSW-T, key joints are often positioned at the bottom of the weld joint, and therefore the problem is particularly remarkable, the FSW-T welding temperature field is actively controlled, the flow field is improved, and the weld joint forming is promoted. Heating is one of the methods to achieve active control of the temperature field. The existing friction stir welding auxiliary heating device has different structures and principles, and has schemes of induction heating, resistance heat transfer, current assistance, flame heating and the like, but most schemes aim at flat butt joint, and the bottom of a welding seam is difficult to heat, so that the flexibility of equipment is poor.

Disclosure of Invention

The invention aims to: the invention aims to provide a friction stir welding T-shaped joint clamp with auxiliary heat, which solves the problems that the bottom of a welding seam is difficult to heat and the flexibility is poor in the conventional friction stir welding auxiliary heat device.

The technical scheme is as follows: the invention discloses a friction stir welding T-shaped joint clamp with auxiliary heat, which comprises a bottom backing plate, wherein an installation groove is formed in the bottom backing plate, a vertical test plate to be welded is placed in the installation groove, the front side and the rear side of the vertical test plate are clamped and limited through the backing plate, the bottoms of the front backing plate and the rear backing plate are fixed with the bottom backing plate, heating devices are respectively arranged between the front backing plate and the vertical test plate, the heating devices comprise copper cushion blocks, a plurality of through grooves are formed in the copper cushion blocks, a metal ceramic heating plate is arranged in the through grooves, one end of the metal ceramic heating plate is connected with a control circuit, two horizontal test plates to be welded, which are in butt joint with the vertical test plate to be welded, are placed on the front backing plate and the rear backing plate, and are pressed through a pressing plate device arranged above the horizontal test plates to be welded.

In order to conveniently fix the front cushion plate and the rear cushion plate to clamp the vertical test plate to be welded, the front cushion plate and the rear cushion plate are connected through screws, the bottoms of the front cushion plate and the rear cushion plate are fixed with the bottom cushion plate through screws, and the corresponding sides of the front cushion plate and the rear cushion plate are provided with protrusions for limiting the vertical test plate to be welded.

The heating device is convenient to install and fix, the front backing plate and the rear backing plate are provided with clamping grooves matched with the heating device, wedging blocks are arranged on the inner sides of the heating device and the clamping grooves, and one end of each wedging block is provided with a boss for limiting the heating device.

The wedging block is convenient to place and limit, and a top block for limiting the wedging block is arranged between one end of the wedging block and the clamping groove.

In order to ensure the heat conducting performance, the surface of the metal ceramic heating plate is coated with high-temperature heat conducting grease.

For the connection and the adjustment position of clamp plate and clamp plate crossbeam, closing device includes two clamp plates that correspond with two levels wait to weld the test panel, and two clamp plates both sides are connected through the clamp plate crossbeam of adjustable setting respectively.

The pressing plate is provided with an array of threaded holes, the pressing plate cross beam is provided with stepped holes corresponding to the threaded holes, and the pressing plate cross beam is connected with the pressing plate through early threaded holes and mounting bolts in the stepped holes.

The contact area with the front backing plate and the rear backing plate is reduced, the heat loss is reduced, and a plurality of grooves are formed in the bottom of the copper cushion block.

The beneficial effects are that: the invention can realize butt joint, lap joint and lap joint clamping of the FSW-T type joint, the heating copper block structure has certain strength, bottom heating and local heating can be realized through the MCH, the temperature field can be effectively optimized, the welding defect of the T type joint can be reduced, the effective forming of the welding seam can be still ensured under the low heat input process, the heating power, the heating area and the plate size can be adjusted according to the requirement, and the flexibility and the applicability are good.

Drawings

FIG. 1 is a schematic view of a split construction of the present invention;

FIG. 2 is a schematic view of the assembled structure of the present invention;

FIG. 3 is a schematic cross-sectional view of section A-A of FIG. 2;

FIG. 4 is a schematic view of the bottom structure of the present invention;

FIG. 5 is a schematic view of the structure with the hold down device removed;

FIG. 6 is a schematic view of a structure in which the heating device is mounted on the rear pad;

FIG. 7 is a schematic view of the structure of the present invention mounted on a table;

FIG. 8 is a schematic view of the structure of the rear pad;

FIG. 9 is a schematic view of a platen module assembly;

FIG. 10 is a schematic view of a copper pad structure;

FIG. 11 is a schematic diagram of a cermet heater plate structure;

FIG. 12 is a schematic diagram of a wedging block configuration;

fig. 13 is a schematic view of a bottom mat structure.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-13, the friction stir welding T-shaped joint clamp with auxiliary heat disclosed by the invention comprises a bottom backing plate, wherein a mounting groove is formed in the bottom backing plate, a vertical test plate to be welded is mounted in the mounting groove, the front side and the rear side of the vertical test plate are clamped through the backing plates, the front backing plate and the rear backing plate are connected through screws, the bottoms of the front backing plate and the rear backing plate are fixed with the bottom backing plate through screws, the front backing plate and the rear backing plate are provided with clamping grooves matched with copper pads, wedge blocks are mounted on parts inside the copper pads and the clamping grooves, one end of each wedge block is provided with a boss for limiting the copper pad, a plurality of rectangular through grooves are formed between one end of each wedge block and each clamping groove, a metal ceramic heating plate is mounted in each rectangular through groove, one end of each metal ceramic heating plate is connected with a control circuit, the heating plates can be subjected to multi-power and multi-position regulation and heating through different numbers of heating plates, the surfaces of each metal ceramic heating plate are coated with high-temperature grease, two horizontal test plates to be welded vertically to two sides of the vertical plates to be welded are placed on the front backing plate and the two horizontal test plates, two horizontal test plates are placed corresponding to the two horizontal compression plates are connected with two horizontal compression plates and two compression plates to be welded by the two horizontal compression plates.

In the assembly process, the vertical test plate 3 to be welded, the forward side backing plate 4 and the backward side backing plate 8 are inverted on a horizontal plane and assembled through the inner hexagon screw 5; one end of the forward side backing plate 4 and one end of the backward side backing plate 8 are provided with a raised platform 21 with the height of 1.4mm, threaded holes 22 matched with the first inner hexagon screws 5 are formed in two ends of the forward side backing plate, one end of the vertical test plate 3 to be welded is adhered to the raised platform 21, and two sides of the vertical test plate are clamped by the first inner hexagon screws 5, the forward side backing plate 4 and the backward side backing plate 8; after the operation is finished, a bottom base plate 7 is assembled on the forward base plate 4 and the backward base plate 8 through a second socket head cap screw 6, and corresponding threaded holes are formed in the bottoms of the forward base plate 4 and the backward base plate 8; two pressing plate cross beams 1 and two pressing plates 2 are arranged according to the size of a test board, an array of threaded holes are formed in the pressing plates 2, stepped through holes are formed in positions, corresponding to the threaded holes, of the pressing plate cross beams 1, the pressing plates 2 are connected through bolts, the distance between the two pressing plate cross beams 1 is adjustable, and the assembled pressing plate modules can be ensured to press the periphery of a horizontal test board to be welded; 4

copper cushion blocks

10 and 12 metal ceramic heating plates 11 are assembled, three rectangular through grooves are formed in the copper cushion blocks 10, the metal ceramic heating plates 11 are placed in the through grooves, high-temperature heat conduction grease needs to be coated on the surfaces of the metal ceramic heating plates 11 before the copper cushion blocks 10 are placed in the through grooves, the other ends of the metal ceramic heating plates 11 are connected with a control circuit, the single heating power of an MCH standard part with the size can reach 80W, the single heating power of 12 MCH can reach 960W, and specific selection can be determined according to actual requirements; the heating system is assembled, the advancing side backing plate 4 and the retreating side backing plate 8 are provided with matched inclined planes, the wedging block 9 and the copper cushion block 10 are provided with matched inclined planes, the pressure above the wedge block is partially converted into thrust for welding lines under the action of the wedging block 9, so that the copper cushion block 10 is clung to a vertical test board to be welded, and a measuring sheet with the thickness of 0.05-0.25 mm can be added on the surface of the wedging block 9 to ensure that the copper cushion block 10 can be compressed; the bottom of the copper cushion block is provided with a plurality of grooves, so that the contact area with the forward side cushion plate 4 and the backward side cushion plate 8 can be reduced, the heat loss is reduced, one side of the copper cushion block is provided with a bevel to be matched with the wedging block 9, the other side of the copper cushion block is provided with a round angle required by FSW-T, the welding stress is reduced, and the copper cushion block is formed with materials; one end of the wedging block is provided with a boss for limiting the copper cushion block 10, the opposite welding starting point of the end is required to be positioned in the advancing direction of the stirring head during installation, the jacking block 12 is used for limiting the wedging block 9, the opposite welding starting point is required to be positioned in the advancing direction of the stirring head, and the wedging block is shorter than the installation groove for facilitating placement of the wedging block and reducing processing difficulty, so that the limiting jacking block 12 is required.

When the invention is used, the assembly obtained in the steps is placed in a workbench, the flat cable of the MCH is arranged, the flat cable positions are reserved on the backing side backing plate 8 and the advancing side backing plate 4, the test board to be welded is assembled, the assembled pressing plate module is pressed around the test board to be welded, FSW-T welding is carried out, a circuit is closed, the MCH heats the copper cushion block 10, and then the test board to be welded is heated to a certain temperature, and then the welding is started.

Claims

1. The utility model provides a take friction stir welding T type joint anchor clamps of auxiliary heat, its characterized in that, including bottom backing plate (7), be provided with the mounting groove on bottom backing plate (7), place in the mounting groove and wait to weld vertical test board, wait to weld both sides through the backing plate clamp around the vertical test board and press from both sides tightly and spacing, front and back backing plate bottom is fixed with bottom backing plate (7), install heating device respectively between front and back backing plate and the vertical test board that waits to weld, heating device includes copper cushion (10), be provided with a plurality of logical grooves in the copper cushion, lead to inslot to install cermet heating plate (11), cermet heating plate (11) one end connection control circuit, place on front and back backing plate and wait to weld two levels of test board butt joint with waiting to weld, the level waits to weld the test board and compress tightly through the clamp plate device that the top set up; the front backing plate and the rear backing plate are provided with clamping grooves matched with the heating device, a wedging block (9) is arranged between the heating device and the inner sides of the clamping grooves, and one end of the wedging block (9) is provided with a boss for limiting the heating device; the front and the rear backing plates, the wedging block (9) and the copper cushion block (10) are provided with matched inclined planes.

2. The friction stir welding T-shaped joint clamp with auxiliary heat according to claim 1, wherein the front cushion plate and the rear cushion plate are connected through screws, the bottoms of the front cushion plate and the rear cushion plate are fixed with the bottom cushion plate through screws, and a protrusion for limiting a vertical test plate to be welded is arranged on the corresponding side of the front cushion plate and the rear cushion plate.

3. The friction stir welding T-shaped joint clamp with auxiliary heat according to claim 1, wherein a top block (12) limiting the wedging block is arranged between one end of the wedging block (9) and the clamping groove.

4. The friction stir welding T-joint clamp with auxiliary heat according to claim 1, wherein the surface of the metal ceramic heating plate (11) is coated with high-temperature heat conductive grease.

5. The friction stir welding T-joint clamp with auxiliary heat according to claim 1, wherein the clamp plate device comprises two clamp plates (2) corresponding to two horizontal test plates to be welded, and two sides of the two clamp plates (2) are respectively connected through an adjustably arranged clamp plate cross beam (1).

6. The friction stir welding T-shaped joint clamp with auxiliary heat according to claim 5, wherein an array of threaded holes are formed in the pressing plate (2), stepped holes are formed in the pressing plate cross beam (1) corresponding to the threaded holes, and the pressing plate cross beam (1) is connected with the pressing plate (2) through early threaded holes and mounting bolts in the stepped holes.

7. The friction stir welding T-joint clamp with auxiliary heat according to claim 1, wherein a plurality of grooves are formed in the bottom of the copper cushion block.