CN203356860U - Self-locking type welding joint for friction stir welding - Google Patents

Abstract

The utility model provides a self-locking welding joint for friction stir welding, which includes a first welding joint and a second welding joint oppositely arranged, and is characterized in that at least one positioning joint is arranged on the first welding joint The boss and at least one locking boss, at least one positioning step and at least one locking step are provided on the second welding head, the positioning boss is aligned with the positioning step, and the locking boss The platform is aligned with the locking step and locked. The utility model can closely fit and lock the welding seam positions of multiple groups of profile plates, effectively resist the mechanical force generated by welding during welding, prevent the side separation of the profile plates, ensure the welding quality, reduce tooling requirements, and control costs. Increase yield and production efficiency.

Description

A self-locking welding joint for friction stir welding

technical field

The utility model relates to a structure of a welding joint, in particular to a self-locking welding joint used for friction stir welding.

Background technique

Friction stir welding technology has broad application prospects in the welding of large thin-walled and wide-width aluminum alloy profile plates such as aircraft panels, fuselages, floors, rail train side walls, and floors. However, there are still many problems to be solved in the friction stir welding of large wide ribbed panels.

In the friction stir welding method, the stirring pin needs to be inserted into the inner surface of the part, and the stirring pin is rotated to stir and weld under the action of a certain axial force, and the material subjected to the friction stir undergoes plastic flow to realize solid-state welding. Since during the welding process, the two parts to be welded will generate a side force that separates the two parts at the position of the weld, which requires a lateral force to be applied to the two parts to make them fit together. However, large wide-width ribbed panels are usually spliced and assembled by multiple groups of profile panels. Many profile panels have a super-long, wide and thin-walled structure, and the welds between profile panels are too long, and some profile panels have complex end structures. , the above-mentioned structural characteristics make it difficult for the lateral pressing device to effectively resist the lateral component force during the welding process, and it is difficult to realize the limitation of mechanical lateral top tightening, and the connection position of the profile plate is prone to side separation, which affects the quality of the welded joint , especially when two pieces of profile plates are spliced together, gaps are more likely to appear at the end positions and cannot be tightly bonded, and then during welding, after welding one side will cause side separation on the other side; and due to the agitation during welding, a large force is exerted on the joint material Mechanical compression force, if there is no support point for the stirring pin inside the material at the splicing position of the end of the profile plate, the welded joint is prone to extrusion deformation and defects. In this way, the fixtures used for clamping the above-mentioned plates are limited in space, quantity and mechanical structure. Therefore, the friction stir welding technology for large and wide ribbed panels has extremely high requirements for fixtures and fixtures, requiring a lot of manpower and material resources.

In order to solve the technical defect that some end faces are complex in shape and difficult to effectively tighten laterally when welding profile plates, the utility model proposes a self-locking welding joint for friction stir welding. The self-locking welding joint can closely fit and lock the welding seam positions of multiple groups of profile plates, effectively resist the mechanical force generated by welding during welding, prevent the side separation of profile plates, ensure the welding quality, and reduce the tooling requirements at the same time. Control costs, increase output and production efficiency.

Utility model content

The purpose of this utility model is to provide a kind of welding seam that can closely fit and lock the positions of multiple groups of profile plates, effectively resist the mechanical force generated by welding during welding, prevent the side separation of profile plates, and ensure the welding quality. Self-locking welding head for friction welding.

In order to achieve the above purpose, the utility model proposes a self-locking welding joint for friction stir welding, which includes a first welding joint and a second welding joint oppositely arranged, and at least one positioning joint is arranged on the first welding joint The boss and at least one locking boss, at least one positioning step and at least one locking step are provided on the second welding head, the positioning boss is aligned with the positioning step, and the locking boss The platform is aligned with the locking step and locked.

The self-locking welding joint for friction stir welding as described above, wherein the positioning boss is a right-angle boss, the positioning step is a right-angle step, and the right-angle boss and the right-angle step are joined together.

The above-mentioned self-locking welding joint for friction stir welding, wherein, the locking boss is a transition boss with bent rounded corners, and the locking step is a transitional step with bent rounded corners, The curved transition boss with rounded corners is aligned and locked with the curved transition step with rounded corners.

The above-mentioned self-locking welding joint for friction stir welding, wherein, the locking boss is continuously wavy, and the locking step is also continuous wavy, and the wavy locking step It is staggered and aligned with the wavy locking bosses and combined into an integral structure.

The above-mentioned self-locking welding joint for friction stir welding, wherein, the locking boss is in the shape of a hook rotating clockwise, and the locking step is in the shape of a hook rotating counterclockwise. The hook-shaped locking boss is aligned and locked with the hook-shaped locking step.

Compared with the prior art, the utility model has the following characteristics and advantages:

1. The utility model uses a self-locking structure to make the first welding joint and the second welding joint closely fit and lock to resist the side component force during welding, so there is no need to adjust the joint between the first welding joint and the second welding joint. The welding seam is tightened laterally to ensure the welding quality and reduce the tooling requirements.

2. In the utility model, the front weld seam and the back weld seam are dislocated, not on the same straight line, and can self-support to resist the mechanical pressure during welding, prevent the weld seam from collapsing, and ensure the welding quality.

Description of drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help the understanding of the present utility model, and do not specifically limit the shapes and proportional dimensions of the various components of the present utility model. Under the teaching of the utility model, those skilled in the art can choose various possible shapes and proportional dimensions according to specific conditions to implement the utility model.

Fig. 1 is the structural representation of the utility model self-locking welding head;

Fig. 2 is a structural schematic diagram of the self-locking welding head of the present invention after docking;

Fig. 3 is a structural schematic diagram of the first welding joint of the present invention.

Explanation of reference signs:

1-first welding head; 11-positioning boss; 12-locking boss; 2-second welding head; 21-positioning step; 22-locking step; 3-front weld; 4-back weld; 10-profile plate; 20-profile plate; a-the length of the positioning boss; b-the distance between the positioning boss and the locking boss; c-the length of the locking boss; d-the length of the back weld; L- is the length of the front weld; R-the radius of the fillet of the locking boss.

Detailed ways

The details of the utility model can be understood more clearly in combination with the accompanying drawings and the description of the specific implementation of the utility model. However, the specific implementations of the utility model described here are only for the purpose of explaining the utility model, and cannot be construed as limiting the utility model in any way. Under the teaching of the present utility model, any possible deformation based on the present utility model can be conceived by a skilled person, and these should be regarded as belonging to the scope of the present utility model.

Please refer to Fig. 1 and Fig. 2, Fig. 1 is a schematic diagram of the structure of the self-locking welding head of the present invention; Fig. 2 is a schematic diagram of the structure of the self-locking welding head of the present invention after docking.

As shown in Figure 1, a self-locking welding joint for friction stir welding proposed by the utility model is mainly used in the friction stir welding technology of wide plates, and the profile plates 10 and 20 to be assembled and welded are both It is a hollow profile with a wide ribbed structure, the welding position of the profile plate 10 and the profile plate 20 is at the rib, and the welding position of the profile plate 10 and the profile plate 20 is pre-processed into a specific geometry before welding. Shape, that is, the joint position of the profile plate 10 and the profile plate 20 is processed in advance to produce the self-locking welding joint proposed by the utility model, including the first welding joint 1 and the second welding joint 2 which are arranged oppositely, wherein the first welding joint 1 Set on the plate 10, the second welding head 2 is set on the plate 20, the first welding head 1 is provided with a positioning boss 11 and a locking boss 12, and the second welding head 2 is provided with a corresponding positioning boss. The positioning step 21 of the stage 11 corresponds to the locking step 22 of the locking boss 12 . The positioning boss 11 is combined with the positioning step 21 in alignment, and the locking boss 12 is aligned and locked with the locking step 22 . Both the first welded joint 1 and the second welded joint 2 are formed by extrusion, and the shapes of the first welded joint 1 and the second welded joint 2 are completely matched and can fit closely. Before welding, as shown in Figure 2, the positioning boss 11 is combined with the positioning step 21, so that the first welding joint 1 and the second welding joint 2 are butted, and the locking boss 12 and the locking step 22 cooperate with each other to form a self-locking structure, and then use the tooling fixture to positively press the weld position of the profile plate 10 and the profile plate 20, and the self-locking structure formed by the locking boss 12 and the locking step 22 makes the first welding joint 1 and the second welding joint 2 Tightly fit and lock to resist the mechanical force during welding to prevent side separation. Therefore, the utility model does not need to laterally tighten the weld seam between the first welding head 1 and the second welding head 2, which reduces the requirements on tooling. After the first welding head 1 and the second welding head 2 are docked, the front weld 3 and the back weld 4 are respectively formed on the front and back sides of the profile plate. When welding, first use the stirring head to weld the front weld 3, when the front After the weld seam 2 is welded, the profile plate 10 and the profile plate 20 are turned over, and then positively pressed, and then the back weld seam 4 is welded, thereby completing the front and back welding, because the front weld seam 3 and the back seam 4 are misplaced. , not on the same straight line, it can self-support and resist the mechanical pressure during welding, and realize the connection of large wide ribbed profile plates. The self-locking welding joint proposed by the utility model is a self-locking structure formed by the mutual cooperation of the locking boss 12 and the locking step 22, so that the welding seams of multiple groups of profile plates are closely attached and locked without side tightening devices, and can resist The mechanical pressure during welding ensures the welding quality, reduces the tooling requirements, controls the cost of friction stir welding, and improves production efficiency.

In an optional embodiment of the present invention, the positioning boss 11 is a right-angle boss, the positioning step 21 is a right-angle step, and the right-angle positioning boss 11 and the right-angle positioning step 21 are combined together. The locking boss 12 is a transition boss with bent rounded corners, and the locking step 22 is a transitional step with rounded corners in a bent shape. The transitional locking step 22 cooperates and locks.

In this embodiment, please refer to Fig. 3 for the size of the first welding head 1, which is a schematic structural view of the first welding head of the present invention; as shown in Fig. 3, a is the length of the positioning boss 11, b is The distance between the positioning boss 11 and the locking boss 2, c is the length of the locking boss 2, d is the length of the back welding seam 4, L is the length of the front welding seam 3, R is the circle of the locking boss 3 The radius of the corner, the specific dimensions of a, b, c, d, L and R are determined according to the thickness of the part; specifically in this embodiment, L=5mm, a=8mm, b=30mm, R=15mm, c=10mm, d=20mm. The dimensions of the second welding head 2 correspond to the dimensions of the first welding head 1 .

As another embodiment of the present utility model, the locking boss 12 is in a continuous wavy shape, and the locking steps 22 are also in a continuous wavy shape, and the wavy locking steps 22 and the wavy locking bosses 12 are alternately aligned. Bits fit together into one structure.

As the third embodiment of the present utility model, the locking boss 12 is in the shape of a hook that rotates clockwise, and the locking step 22 is in the shape of a hook that rotates in the counterclockwise direction. The hook-shaped locking steps 22 are aligned and locked.

The shapes of the locking boss 12 and the locking step 22 in the present invention can also be other shapes well known to those skilled in the art, as long as the technical effect of self-locking can be achieved. In addition, the number of positioning bosses 11 and matching positioning steps 21 and the number of locking bosses 12 and matching locking steps 22 of the present invention can be selected according to actual needs, which is not limited by the present invention.

For the detailed explanations of the above-mentioned embodiments, the purpose is only to explain the utility model so as to better understand the utility model, but these descriptions cannot be interpreted as a limitation of the utility model for any reason, especially, The various features described in different implementations can also be combined arbitrarily with each other to form other implementations. Unless there is an explicit description to the contrary, these features should be understood as being applicable to any implementation, and not limited to all of them. described implementation.

Claims (5)

1. A self-locking welding joint for friction stir welding, comprising a first welding joint and a second welding joint oppositely arranged, characterized in that at least one positioning boss and At least one locking boss, at least one positioning step and at least one locking step are provided on the second welding head, the positioning boss is aligned with the positioning step, and the locking boss is aligned with the positioning step The locking steps are matched and locked in place. 2. The self-locking welding joint for friction stir welding according to claim 1, wherein the positioning boss is a right-angle boss, and the positioning step is a right-angle step, and the right-angle boss and the right-angle boss are The above right-angled steps are put together. 3. The self-locking welding joint for friction stir welding according to claim 1 or 2, characterized in that, the locking boss is a curved transition boss with rounded corners, and the locking step is It is a bent transition step with rounded corners, and the transition boss with rounded corners is aligned and locked with the transition step with rounded corners. 4. The self-locking welding joint for friction stir welding according to claim 1 or 2, characterized in that, the locking boss is in a continuous wave shape, and the locking step is also in a continuous wave shape , the wavy locking steps and the wavy locking bosses are staggered and assembled into one structure. 5. The self-locking welding joint for friction stir welding according to claim 1 or 2, wherein the locking boss is in the shape of a hook rotating in the clockwise direction, and the locking step is in the shape of a counterclockwise The hook shape rotates in the clockwise direction, and the hook-shaped locking boss is locked in alignment with the hook-shaped locking step.

Images