CN215966815U

CN215966815U - Gas protection device for longitudinal butt welding joint

Info

Publication number: CN215966815U
Application number: CN202121822426.7U
Authority: CN
Inventors: 刘红禹; 邢卓; 冯峰; 王涛; 刘佳宁; 郭雪枫; 刘满; 李世春; 王军; 黄伟昌; 王福新
Original assignee: Shenyang Huibo Heat Energy Equipment Co ltd
Current assignee: Shenyang Huibo Heat Energy Equipment Co ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2022-03-08
Anticipated expiration: 2031-08-06

Abstract

The utility model discloses a gas protection device for a longitudinal butt welding joint, which is characterized in that: comprises two dragging covers respectively arranged at the upper side and the lower side of a welding joint and a handle connected with the two dragging covers; the dragging cover comprises a cover body, an air inlet pipe, an air splitter plate and an air baffle plate; the cover body is in a cuboid shape, one side of the cover body close to the welding joint is provided with an opening, the cover body far away from the welding joint is provided with an air inlet pipe, an air baffle plate is arranged below an interface of the air inlet pipe on the inner side of the cover body, and an air splitter plate is arranged at the opening; the gas splitter plate is welded on the inner wall close to the opening, and a plurality of exhaust holes are formed in the gas splitter plate. This scheme drags the cover two and combines as an organic wholely through the handle, and the upper and lower face of protection welded joint simultaneously can also make the position of dragging the cover down more accurate, just in time is located the below of solder joint. The supporting wheel can guarantee the position of the lower dragging cover, the gas protection effect is improved, and meanwhile, the service life of the whole body is prolonged.

Description

Gas protection device for longitudinal butt welding joint

Technical Field

The utility model relates to the field of welding of pressure vessels, in particular to a gas protection device for a longitudinal butt welding joint.

Background

The inert gas protection is the most basic requirement for argon tungsten-arc welding, and as long as the argon tungsten-arc welding is adopted, argon protection must be carried out on a high-temperature molten pool and a high-temperature welding bead, particularly on metal materials such as titanium, nickel, stainless steel and the like which are easy to oxidize, even if the metal materials are carbon steel or low alloy steel, the carbon steel or the low alloy steel is well protected and is silvery white. The oxidation reaction of chromium element in stainless steel is active, and the chromium element is easy to be oxidized and burned at high welding temperature, so that the corrosion resistance of a welding joint is reduced. In addition, when the argon tungsten-arc welding is adopted for backing and welding stainless steel, if the back side is not provided with argon gas for protecting the back side welding line, the back side welding line cannot be formed. For unprotected carbon steel or low alloy steel welded joints which have been oxidized, nondestructive testing by conventional methods is generally conducted, and oxidized weld metal is untested by nondestructive testing, but fails in mechanical property (back bending) testing. Performance concerns safety in the use of the container. Therefore, the welding of the same steel needs protection, and the welding of different steels needs protection, such as the welding of low alloy steel and stainless steel. The argon tungsten-arc welding is often used for backing welding due to the characteristic that the back of a welding seam is easy to form, and during backing welding, the back of the welding seam needs to be protected by argon gas, and the back welding seam with good argon gas protection does not need to be subjected to back gouging treatment. The gas protection area formed by a nozzle on a welding gun for argon tungsten-arc welding can only protect the front side of a welding molten pool, and can not protect the back side of the welding molten pool, a solidified welding seam in a high-temperature state and the upper surface and the lower surface of a heat affected zone of the welding seam. Therefore, additional protection is required for the back side of the weld pool and the weld metal at high temperature.

The inflation tool for protecting the welding back surface of the stainless steel plate disclosed in patent publication No. CN 110802314A can only protect the back surface of a welding bead and cannot protect the front surface of the welding bead.

A titanium alloy welding protection device disclosed in patent publication No. CN 206216145U can only protect the front side of the weld bead, and an additional protection device is required to be added to the back side of the weld bead, i.e. the protection of the upper and lower weld beads is separated. In addition, the device needs to be fixedly connected with a welding gun, and if the welding gun is held by hand, the flexibility of operation is greatly hindered.

The patent publication No. CN 203918201U discloses a front protection cover for titanium argon arc welding, which can only protect the front of the welding bead, i.e. the protection of the upper and lower welding beads is also separated. The protective cover also needs to be fixedly connected with the welding gun.

From current welding protection technology, because the upper and lower protection to a welding bead is the separation, often weld alone and need two people cooperation protection, two people hold respective protection device respectively, and the front protection device who holds the welding bead alone follows closely the walking behind welder, and the back protection device who holds the welding bead alone protects the back of welding bead.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of welding oxidation and overcome the defects of the prior welding protection technology, the utility model provides a gas protection device for a longitudinal butt welding joint,

the technical scheme adopted by the utility model is as follows: a gas shield assembly for a longitudinal butt weld joint, comprising: comprises two dragging covers respectively arranged at the upper side and the lower side of a welding joint and a handle connected with the two dragging covers;

the dragging cover comprises a cover body, an air inlet pipe, an air splitter plate and an air baffle plate;

the cover body is in a cuboid shape, one side of the cover body close to the welding joint is provided with an opening, the cover body far away from the welding joint is provided with an air inlet pipe, an air baffle plate is arranged below an interface of the air inlet pipe on the inner side of the cover body, and an air splitter plate is arranged at the opening; the gas splitter plate is welded on the inner wall close to the opening, and a plurality of exhaust holes are formed in the gas splitter plate.

Furthermore, a slope is arranged at the front end of the upper side towing cover, a groove is arranged in the middle of the slope, and a front sealing plate is arranged at the groove.

Furthermore, an arc is arranged at the tail end of the handle.

Furthermore, the lower dragging cover and the upper dragging cover are made of red copper, and the handle is made of carbon steel.

Furthermore, a supporting wheel is arranged on the lower dragging cover.

Compared with the prior art, the utility model has the beneficial effects that: this scheme drags the cover with two and combines as an organic wholely through the handle, no longer is traditional upper and lower protection separation mode, drags the cover from top to bottom to link together, realizes protecting welded joint's upper and lower face simultaneously, uses when being suitable for fixed spot welding and formal welding when assembling. The integrated structure can ensure that the position of the lower dragging cover is more accurate and is just below the welding spot. The supporting wheels on the lower dragging cover can effectively guarantee the position of the lower dragging cover, improve the gas protection effect and prolong the service life of the whole body. The upper and lower dragging covers are connected through the handle, so that the upper and lower protection of a longitudinal welding joint can be realized simultaneously, only one hand holds the device to be matched with welding operation, and the labor is saved; the protection device is not connected with the welding gun, is independently used, and does not hinder the flexibility of operation of a welder. The protector is suitable for welding easily oxidized metal, such as titanium material, nickel material and stainless steel, and is also suitable for welding carbon steel or low alloy steel. Especially, the welding protection of the butt joint of the flat plate or the butt joint of the cylinder with small curvature is suitable, and the application range is wide.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic top view of the structure of FIG. 1;

FIG. 3 is a schematic view of the upper drag cover structure;

FIG. 4 is a schematic right-side view of FIG. 2;

FIG. 5 is a schematic bottom view of FIG. 2;

FIG. 6 is an enlarged partial schematic view of FIG. 2;

FIG. 7 is a schematic sectional view taken along line A-A of FIG. 6;

FIG. 8 is a schematic view of a drag cover configuration;

FIG. 9 is a schematic right view of FIG. 8;

FIG. 10 is a schematic top view of FIG. 8;

FIG. 11 is a schematic bottom view of FIG. 8;

fig. 12 is a schematic sectional view taken along line B-B in fig. 11.

In the figure: 1-pulling down the cover; 2, pulling the cover up; 3-a handle; 4-rubber tube; 5. -a hose; 6-a welding gun; 7-weldment; 8-arc; 9-a cover body; 10-an air inlet pipe; 11-front closing plate; 12-gas splitter plate; 13-gas baffle; 14-a vent hole; 15-a groove; 16-slope surface; 17-a cover body; 18-an air inlet pipe; 19-gas splitter plate; 20-a gas baffle; 21-exhaust hole; 22-air inlet pipe interface; 23-air inlet pipe interface; 24-welded joints; 25-welding the connection points; 26-pass.

In order to more clearly illustrate the manner in which the present invention is implemented, reference will now be made in detail to the accompanying drawings used in the implementation, it being understood that the drawings in the following description are merely exemplary of the utility model and that other drawings may be derived therefrom by those skilled in the art without the exercise of inventive faculty.

Detailed Description

The utility model is further described with reference to the accompanying drawings.

As shown in fig. 1 and 2, a gas protection device for longitudinal butt welding joint has the structure that: the protection device comprises two dragging covers, namely an upper dragging cover 2, a lower dragging cover 1 and a handle 3 which are respectively arranged at the upper side and the lower side of the welding joint. The lower dragging cover 1 and the upper dragging cover 2 are equal in size and equal in width and are rectangular, and the front end position of the lower dragging cover 1 exceeds the front end position of the upper dragging cover 2 by 50-60 mm. The material that drags cover 1 down and drag cover 2 on is red copper, forms through panel beating shaping and welding, and the handle is formed by carbon steel reinforcing bar simmering, drags cover 1, drags cover 2 on will drag down through welded joint point 24 and welded joint point 25 and handle 3 connects into whole to constitute this protection device. The circular arc 8 of the handle 3 functions to reinforce the elastic deformation.

As shown in fig. 3 to 7, the upper dragging cover 2 is composed of a cover body 9, an air inlet pipe 10, a front sealing plate 11, an air splitter plate 12, and an air baffle plate 13. The cover body 9 is a cuboid and is made of a red copper sheet with the thickness of 1mm by a sheet metal process, and comprises an upper side face and four peripheral side faces. The cover 9 and the air inlet pipe 10 are connected by welding at an air inlet pipe joint 22, and the air inlet pipe joint 22 is located at the center of the cover 9. The front closing plate 11 is connected with the cover 9 by welding at the sloping surface 16 of the cover 9. The gas baffle 13 is arranged in the cover body 9 and is connected with the inner wall of the cover body 9 by welding at a position 225mm away from the air inlet pipe connector, and the center of the square gas baffle 13 is aligned with the center of the air inlet pipe connector 22. The gas splitter plate 12 is arranged in the cover body 9 and is connected with the inner wall of the cover body 9 and the front sealing plate 11 by welding at a position 5mm away from the bottom end of the cover body 9. The gas distribution plate 12 is provided with exhaust holes 14 arranged regularly with a diameter of 1 mm. The left end of the cover body 9 is provided with a slope 16, and a groove 15 is formed by the slope and the front sealing plate 11. The arrangement of the sloping surface 16 of the upper drag cover 2 facilitates the swinging of the welding gun.

As shown in fig. 8 to 12, the lower dragging cover 1 is composed of a cover body 17, an air inlet pipe 18, a gas splitter plate 19, and a gas baffle plate 20. The cover body 17 is a cuboid and is made of red copper sheet 1mm by sheet metal process, and comprises a lower side surface and four peripheral side surfaces. The cover 17 and the inlet pipe 18 are connected by welding at an inlet pipe connection 23, the inlet pipe connection 23 being located in the center of the cover 17. The gas baffle 20 is arranged in the cover body 17 and is connected with the inner wall of the cover body 17 through welding at a position 235mm away from the air inlet pipe connector, and the center of the square gas baffle 20 is aligned with the center of the air inlet pipe connector 23. The gas flow distribution plate 19 is arranged in the cover body 17 and is connected with the inner wall of the cover body 17 through welding at a position 5mm away from the upper end of the cover body 17. The gas splitter plate 19 is provided with exhaust holes 20 arranged regularly with a diameter of 1 mm. A support wheel 27 is provided at the lower part of the tow-down cover 1, and the support wheel 27 is fixed below the tow-down cover by a support wheel fixing arm 28. The supporting wheel fixing arm 28 is inverted Y-shaped and is fixedly connected with the lower dragging cover 1 through a bolt, and the length of the fixing arm can be adjusted so as to be suitable for different pipe diameters or table tops. Through supporting wheel 27, can effectually guarantee to drag the position of cover 1 down, make it be located suitable height just to improve gas protection's effect, simultaneously because of it has born most weight, can reduce the burden of handle, still improved holistic life.

The working principle of the utility model is as follows by combining the attached drawings 1 and 2: before welding, one end of the rubber tube 4 and one end of the rubber tube 5 are respectively inserted into the air inlet pipe 10 and the air inlet pipe 18, the other end of the rubber tube 4 and the other end of the rubber tube 5 are respectively connected with a valve of a steel cylinder filled with inert protective gas through a flow control meter, then the valve of the gas cylinder is opened, the flow control meter is opened to allow the inert protective gas with proper flow to simultaneously respectively enter the rubber tube 4 and the rubber tube 5, then respectively enter the air inlet pipe 10 and the air inlet pipe 18, and then respectively enter the cover body 9 and the cover body 17. After entering the cover body 9 and the cover body 17, the protective gas is blocked by the gas baffle 13 and the gas baffle 20 respectively, which has a buffering effect, so that the protective gas is dispersed into a laminar flow and flows out from the exhaust holes 14 on the gas splitter plate 12 and the exhaust holes 21 on the gas splitter plate 19 respectively. When sensing that the inert protective gas flows out smoothly from the exhaust hole 14 and the exhaust hole 21, the protection device enters a working state.

The lower dragging cover 1 and the upper dragging cover 2 are broken off, one end of a to-be-welded longitudinal welding seam 26 of a weldment 7 is arranged between the lower dragging cover 1 and the upper dragging cover 2, the central line of a longitudinal groove of the weldment is aligned with the central lines of the lower dragging cover 1 and the upper dragging cover 2 in length, the lower dragging cover 1 and the upper dragging cover 2 are respectively attached to the upper surface and the lower surface of the weldment 7, an incompletely-closed space is formed between the gas flow distribution plate 12 and the gas flow distribution plate 19 and the upper surface and the lower surface of the weldment, and when inert protective gas is filled into the space, the air is discharged from the joint between the lower dragging cover 1 or the upper dragging cover 2 and the weldment 7 to form an inert protective gas chamber, so that the upper surface and the lower surface of a high-temperature welding bead are protected, and the welding seam metal is protected from being oxidized, and the welding quality is ensured. The tightness of the upper and lower surfaces of the lower dragging cover 1 and the upper dragging cover 2 and the weldment 7 can be adjusted by expanding or compressing an arc 8 at the tail end of the handle 3.

When welding, when one person holds welding gun 6 and welds from right to left, one person holds handle 3 of this protection device and places welding gun 6 in recess 15 of upper drag cover 2, and this protection device of hand push is closely walked along with welding gun 6 to the welding seam metal of protection weldment 7 is not by oxidation. Firstly, assembling and spot welding are carried out, and then formal welding is carried out.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas shield assembly for a longitudinal butt weld joint, comprising: comprises two dragging covers respectively arranged at the upper side and the lower side of a welding joint and a handle connected with the two dragging covers;

2. A gas-shielding device for longitudinal butt-welded joints according to claim 1, characterized in that: the front end of the upper side dragging cover is provided with a slope surface, the middle part of the slope surface is provided with a groove, and a front sealing plate is arranged at the groove.

3. A gas-shielding device for longitudinal butt-welded joints according to claim 1, characterized in that: the tail end of the handle is provided with an arc.

4. A gas-shielding device for longitudinal butt-welded joints according to claim 1, characterized in that: the lower dragging cover and the upper dragging cover are made of red copper, and the handle is made of carbon steel.

5. A gas-shielding device for longitudinal butt-welded joints according to claim 1, characterized in that: the lower dragging cover is provided with a supporting wheel.