CN216990548U

CN216990548U - Arc striking and extinguishing plate for welding

Info

Publication number: CN216990548U
Application number: CN202122768774.7U
Authority: CN
Inventors: 洪城; 陈治蒿; 陆佳华; 孙滨; 陈思浩; 郭传锋
Original assignee: Shanghai Jiangnan Changxing Shipbuilding Co Ltd
Current assignee: Shanghai Jiangnan Changxing Shipbuilding Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-07-19
Anticipated expiration: 2031-11-12

Abstract

The utility model relates to a leading and extinguishing plate for welding, which is arranged on one side of a base metal to be welded and comprises a plate body, wherein a U-shaped groove is formed in the plate body, the notch of the U-shaped groove faces upwards, and the U-shaped opening of the U-shaped groove faces to one side of the base metal to be welded. According to the welding arc striking and extinguishing plate, the U-shaped groove is formed, so that the welding stress is effectively and uniformly dispersed in the welding use process of the arc striking and extinguishing plate, the problems of welding deformation, air holes, cracks and the like caused by stress concentration in the welding process are solved, and the subsequent rework operation is reduced.

Description

Arc striking and extinguishing plate for welding

Technical Field

The utility model relates to the field of welding, in particular to an arc striking and extinguishing plate for welding.

Background

In the production process of the ship body, the welding operation can reach more than 60%, but the welding defects are classified into various types, and if the welding defects can not be effectively controlled in the welding process or can not be correctly processed after welding, the phenomena of fracture, water leakage and the like can be caused in the navigation process of the ship. In the jointed plate welding operation, welding defects are easy to occur in the initial welding, instantaneous current and voltage cannot meet the requirements of gas protection and base metal application type in place, in order to prevent the occurrence of the welding defects, a welding seam interface with normal size is obtained at the initial end and the tail end of a welding joint, a metal plate, namely an arc striking and extinguishing plate, is assembled before welding, the initial welding and the final welding are performed on the two metal plates, and the metal plates are cut off after spot welding is completed.

In the traditional arc striking and extinguishing plate operation process, a small whole plate or an elastic arc striking and extinguishing plate is adopted, and the quality defects of welding ends are more due to the problems of welding shrinkage, welding stress concentration and the like.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the arc striking and extinguishing plate for welding, and the U-shaped groove is formed in the arc striking and extinguishing plate, so that the welding stress is uniformly dispersed during processing, and the welding deformation is reduced.

The technical purpose of the utility model is realized by the following technical scheme:

the utility model provides a welding is with drawing board of putting out arc, installs and treats welding parent metal one side, draws the board of putting out arc and includes the run-on plate and put out the arc board, and its structure includes the plate body, has seted up U type groove on the plate body, and the notch in U type groove is upwards, and the U type opening in U type groove is towards treating welding parent metal one side.

Furthermore, the plate body is 300mm long, 300mm wide and 20-25mm thick, and the plate thickness of the base metal to be welded is 20-25 mm.

Further, the U-shaped opening of the U-shaped groove is 80mm away from the edge of the plate body.

Further, the half width of the U-shaped opening end of the U-shaped groove is 120mm, and the distance between the U-shaped opening end of the U-shaped groove and the U-shaped bottom is 110 mm.

Further, the notch depth of U type groove equals plate body thickness.

Furthermore, the orientation of the U-shaped opening of the U-shaped groove of the arc striking plate is consistent with the welding direction, and the orientation of the U-shaped opening of the U-shaped groove of the arc extinguishing plate is opposite to the welding direction.

Further, the plate body is made of the same material as the base material to be welded.

Compared with the prior art, the utility model has the beneficial effects that:

according to the welding arc striking and extinguishing plate, due to the arrangement of the U-shaped groove, welding stress is effectively and uniformly dispersed in the welding use process of the arc striking and extinguishing plate, the problems of welding deformation, air holes, cracks and the like caused by stress concentration in the welding process are solved, and the subsequent rework operation is reduced;

the arc striking and extinguishing plate has a simple structure, can be used by any assembler, reduces welding deformation under the premise of ensuring the quality of a welding end, and reduces the probability of quality defects such as air holes and cracks in an end area caused by the influence of instantaneous current and voltage and the workload of subsequent electric welding polishing repair and the like;

the U-shaped grooving is unified in position, the arc extinguishing plate can be grooved automatically only by a hand cutter, difficulty is low, and only workers need to master a basic assembly and cutting process.

Drawings

FIG. 1 is a schematic view of a welding arc striking and extinguishing plate structure according to the present invention.

Fig. 2 is a plan view of the structure of the welding starting and extinguishing plate of the present invention.

Fig. 3 is a schematic view of the installation of the arc striking and extinguishing plate for welding in the present invention.

Fig. 4 is a conventional arc runner welding stress analysis map.

FIG. 5 is a graph of the weld stress analysis of the arc runner of the present invention.

FIG. 6 is a conventional weld stress analysis map of an arc-quenching plate.

Fig. 7 is a picture of weld stress analysis of the arc quenching plate of the present invention.

In the figure, 1, a plate body; 2. a U-shaped groove; 3. a U-shaped open end; 4. a U-shaped bottom; 5. an arc striking plate; 6. an arc extinguishing plate.

Detailed Description

The technical solution of the present invention is further described below with reference to specific embodiments:

a striking and extinguishing plate for welding, as shown in figures 1-3, is installed on one side of a base metal to be welded, can effectively reduce the welding defects of a welding end, controls the deformation of the welding end, and is suitable for all submerged arc welding and CO₂The manual welding plate splicing operation can also be suitable for the butt welding of angle steels with smaller width and small welding quantity; the arc striking and extinguishing plate comprises an arc striking plate and an arc extinguishing plate, and structurally comprises a plate body 1, wherein a U-shaped groove 2 is formed in the plate body 1, a notch of the U-shaped groove 2 faces upwards, and a U-shaped opening of the U-shaped groove 2 faces to one side of a base material to be welded.

Because the thickness of the plate is thin, heat input in the welding process is not like that the thick plate is easy to release welding stress in the plate thickness direction, the stress can be concentrated in the plate thickness direction, the internal stress is tensile stress near the welding seam, the area far away from the welding seam is compressive stress, and the compressive stress is

Under critical stress

When the welding seam is pulled by the internal stress, the phenomenon of upward warping shrinkage deformation can occur.

In the formula (I), the compound is shown in the specification,

is critical stress (Pa), delta is plate thickness (mm) of the base material to be welded, B is plate width (mm) of the base material to be welded, K is splicing plate support coefficient, the more structures welded on the base material to be welded, the higher the K value isThe larger the critical stress value.

It can be seen from the above formula that the smaller the ratio of the plate thickness to the plate width, the larger the critical stress, and the easier the instability to cause the wave deformation, the plate thickness of the mother material to be welded is 20-25mm, the arc striking and extinguishing plate is 20-25mm, and the best welding effect is obtained when the arc striking and extinguishing plate is the same as the mother material to be welded.

The plate body adopts long 300mm, wide 300mm, thickness is 20 mm's panel in this embodiment, and the U type opening in U type groove is apart from the edge 80mm of plate body, and the half width (the distance of U type opening tip to U type opening middle part) of the U type opening tip 3 in U type groove is 120mm, and the distance of U type opening tip 3 in U type groove apart from U type bottom 4 is 110 mm. In order to better realize the uniform dispersion of stress, the notch depth of the U-shaped groove is equal to the thickness of the plate body.

When the welding device is used, the arc striking plate 5 and the arc quenching plate 6 are respectively welded and fixed at two ends of a 20mm thick base metal to be welded, in order to ensure that the stress distribution direction is correct, the orientation of a U-shaped opening of a U-shaped groove of the arc striking plate is consistent with the welding direction, and the orientation of a U-shaped opening of a U-shaped groove of the arc quenching plate is opposite to the welding direction.

The material influences a decisive factor on deformation in the welding process, different materials correspond to different thermophysical properties and mechanical properties, wherein the thermophysical properties are mainly reflected on a heat conductivity coefficient, the heat conductivity coefficient is related to factors such as a welding deformation heat conductivity coefficient and a composition structure, density, water content, temperature and the like of the material, and the lower the heat conductivity coefficient of the general material is, the larger the temperature gradient of a heat reaction zone in the welding process is, the smaller the elastic modulus is, and the larger the elastic modulus deformation of the material is; when the yield strength limit of the material is slowly reached in the welding process, the residual stress reaches the highest value, and brittle fracture is easily caused, so the selection of the material is the first step of controlling welding deformation, the material is confirmed to be the best consistent with the material of the base metal through field experiments, and the material of the E-grade steel is secondly selected, and the plate body is preferably a plate which is the same as the material of the base metal to be welded.

Through finite element analysis, the stress distribution on the traditional run-on plate and the stress analysis on the run-on plate of the utility model are respectively analyzed, as shown in fig. 4 and fig. 5, the range of welding deformation after the run-on plate of the utility model is obviously reduced compared with the range before, and the stress is effectively dispersed. Similarly, for the stress distribution on the conventional arc quenching plate and the stress analysis on the arc quenching plate of the utility model, as shown in fig. 6 and 7, it can be clearly seen that the welding deformation after the arc quenching plate of the utility model is adopted is obviously reduced compared with the former range, and the stress is effectively dispersed.

The present embodiment is only for further explanation and not for limitation of the present invention, and persons skilled in the art can make non-inventive modifications to the present embodiment as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.

Claims

1. The utility model provides a welding is with drawing board of putting off arc, its characterized in that installs and treats welding parent metal one side, draw the board of putting off arc and include the board of putting on arc and put off the arc board, the package rubbing board body, U type groove has been seted up on the board body, the notch in U type groove is upwards, the U type opening in U type groove is towards treating welding parent metal one side.

2. The arc striking and extinguishing plate for welding according to claim 1, wherein the plate body has a length of 300mm, a width of 300mm and a thickness of 20-25 mm; the thickness of the base metal to be welded is 20-25 mm.

3. The arc striking and extinguishing plate for welding according to claim 2, wherein the U-shaped opening of the U-shaped groove is 80mm from the edge of the plate body.

4. The arc striking and extinguishing plate for welding according to claim 3, wherein the half width of the U-shaped opening end of the U-shaped groove is 120mm, and the distance from the U-shaped opening end of the U-shaped groove to the U-shaped bottom is 110 mm.

5. The arc striking and extinguishing plate for welding as recited in claim 1, wherein the notch depth of the U-shaped groove is equal to the plate thickness.

6. The arc striking and extinguishing plate for welding as claimed in claim 1, wherein the U-shaped opening of the U-shaped groove of the arc striking plate faces in the same direction as the welding direction, and the U-shaped opening of the U-shaped groove of the arc extinguishing plate faces in the opposite direction to the welding direction.

7. The arc striking and extinguishing plate for welding according to claim 1, wherein the plate body is made of the same material as a base material to be welded.