Telescopic deformation titanium alloy pipeline welding protection drag cover

Abstract

The present invention relates to a telescopic deformation titanium alloy pipeline welding protective drag cover. It can ensure the purity of the argon gas filled inside the protective cover, so that the surface of the titanium alloy welding joint appears silvery white and the welding quality is excellent; at the same time, it can be applied to the argon filling protection requirements of titanium alloy pipelines of different specifications and diameters. The technical solution adopted by the present invention includes: one side of the inner plate and the outer plate are respectively cut into vertical strips; the inner plates are respectively welded to the two long sides of the drag cover shell; the rectangular hole 2 on the inner plate is connected to the rectangular hole 1 on the outer plate by bolts; the connection of different hole positions realizes the bending curvature of the drag cover shell; the front end of the drag cover shell is provided with a fixing buckle for fixing the argon arc welding gun; the inner side surface of the drag cover shell is provided with an air inlet pipe and an exhaust pipe, the air inlet pipe extends out of the drag cover shell, and the exhaust pipe is evenly provided with small exhaust holes, the exhaust holes are facing the top of the inner cavity of the protective cover, and the filling chamber between the exhaust pipe and the weld is provided with a filter.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy pipeline welding, and in particular to a telescopic deformation titanium alloy pipeline welding protective drag cover. Background Art

[0002] Titanium and its alloys are widely used in fields such as petrochemicals due to their high specific strength, excellent corrosion resistance, and wide operating temperature range. However, due to their strong chemical activity at high temperatures, titanium reacts with elements such as hydrogen, oxygen, nitrogen, and carbon in the air during welding. During welding, titanium absorbs hydrogen above 250°C, oxygen above 400°C, and nitrogen above 600°C. The infiltration of these elements into the molten pool will degrade the mechanical properties of the welded joint. Therefore, during welding, the molten pool, weld, and heat-affected zone (HAZ) above 400°C must be protected with an inert gas to prevent metal oxidation.

[0003] In the field of petrochemical industry, titanium alloy process pipeline welding construction is mostly carried out in atmospheric environment, and pipeline welding requires local welding gas protection. The two commonly used measures for titanium alloy pipeline welding in construction are push hood protection and drag hood protection. The main shortcomings of these two types of protection hoods are:

[0004] The push-shield protection method requires each welder to be equipped with a helper to push the protective cover in coordination with the welder's welding rhythm, which greatly increases the labor cost during construction.

[0005] The drag hood protection method is a new type of protection method optimized on the basis of the push hood. The protective hood and the welding gun are connected as one by a fixing clip, and the welder operates the welding gun to drive the protective hood. Since the bending curvature of the protective drag hood must be the same as the curvature of the outer arc of the pipeline, it can ensure that the contact part between the protective hood and the pipeline is tightly sealed to prevent side leakage from affecting the gas purity inside the protective hood. Therefore, the construction site must make corresponding protective hoods according to the specifications of the titanium alloy pipeline, and equip protective drag hoods of different specifications according to the number of welders.

[0006] The above two protective covers also have the problem that the internal gas channel design is unreasonable, resulting in uneven distribution of gas reaching the protected metal and failure to achieve uniform protection. Summary of the Invention

[0007] In view of this, the present invention provides a telescopic deformable titanium alloy pipeline welding protective drag cover, which can ensure the purity of the argon gas inside the protective cover, so that the surface of the titanium alloy welding joint appears silvery white and the welding quality is excellent; at the same time, it can be adapted to the argon filling protection requirements of titanium alloy pipelines of different specifications and diameters.

[0008] To achieve the above-mentioned purpose of the invention, the present invention adopts the following technical scheme: a telescopic deformable titanium alloy pipe welding protective drag cover, comprising a flexible drag cover shell, an inner plate and an outer plate; one side edge of the inner plate and the outer plate are respectively sheared into vertical strips, and rectangular holes one and two are arranged on the vertical strips of the outer plate and the inner plate according to the bending curvature of the drag cover shell; the inner plates are respectively welded on the two long sides of the drag cover shell, the rectangular hole two on the inner plate is connected with the rectangular hole one on the outer plate by bolts, and the connection of different hole positions realizes the bending curvature of the drag cover shell, and a fixing buckle is provided at the front end of the drag cover shell, which connects the argon arc welding gun and the drag cover shell as a whole; an air inlet pipe and an exhaust pipe are provided on the inner side surface of the drag cover shell, the air inlet pipe extends out of the drag cover shell, the air inlet pipe and the exhaust pipe are connected by bolts, and small exhaust holes are evenly arranged on the exhaust pipe, and the exhaust hole direction is facing the top of the inner cavity of the protective cover, and a filter is provided in the filling chamber between the exhaust pipe and the weld.

[0009] Furthermore, filter fixing rods are respectively provided at the front and rear ends of the two inner plates. The filter fixing rods are provided at the lower end of the filter to fix the filter.

[0010] Furthermore, the exhaust pipe is U-shaped, the intake pipe is L-shaped, and one end of the L-shaped intake pipe is connected to the middle position of the bend of the U-shaped exhaust pipe.

[0011] Furthermore, the vertical strips of the inner and outer panels are evenly arranged in the middle and are equal in size, and the width of the vertical strips on both sides is greater than the width of the middle vertical strip.

[0012] Furthermore, the inner plate is a rectangular plate.

[0013] Furthermore, the outer side plate is an L-shaped plate.

[0014] Furthermore, the filter screen is an L-shaped filter screen, and the short side end of the filter screen is welded to the bottom surface of the drag cover shell.

[0015] Furthermore, the filter is a 100-mesh copper filter.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The curvature of the contact surface between the protective cover and the outer arc of the pipeline can be adjusted from 180 degrees to 360 degrees by different overlapping degrees of the inner and outer plates, thereby meeting the argon filling protection requirements for butt welding of flat titanium alloy plates and the argon filling protection drag cover requirements for welding titanium alloy pipelines of different diameters.

[0018] 2. The present invention enables a welder to be equipped with an argon-filled protective hood to meet the argon-filled protection requirements for titanium alloy pipe welding of all specifications on site.

[0019] 3. The filling chamber between the U-shaped exhaust pipe in the inner cavity of the drag hood and the weld is provided with a filter screen, and the filter screen is used to make the filled argon gas evenly cover the weld and the heat-affected zone.

[0020] 4. The drag cover of the present invention can adjust the curvature of the protective cover according to the positioning bolts during the welding process of the titanium alloy pipe, and is suitable for the sealing requirements of the contact surface between the outer arc of the titanium alloy pipe with different diameters and the protective cover.

[0021] 5. The present invention utilizes the fact that the mass of argon is greater than the mass of air to effectively discharge the air from the inner cavity of the protective cover, thereby ensuring the purity of the argon filling the inner cavity of the chamber. The surface of the titanium alloy welded joint is silvery white after welding, and the welding quality is excellent.

[0022] 6. The present invention is provided with a filter fixing rod, which ensures that the filter screen adjusts its curvature synchronously while the drag cover adjusts its curvature. The filter screen is flexible. During the adjustment process, the filter screen is bent by pressing the tail end of the drag cover shell. At the same time, the two filter fixing rods realize the bending of the filter screen while ensuring the argon-filled space between it and the drag cover shell 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the welding process of the present invention;

[0024] Figure 2 This is a schematic diagram of the present invention when the structure is adjusted to flat plate welding;

[0025] Figure 3 It is a top view of the structure of the present invention;

[0026] Figure 4 It is a perspective view of the structure of the present invention;

[0027] Figure 5 It is a horizontal schematic diagram of the inner side plate of the present invention;

[0028] Figure 6 This is a schematic diagram of the inner plate bending of the present invention;

[0029] Figure 7 It is a horizontal schematic diagram of the outer side plate of the present invention;

[0030] Figure 8 This is a schematic diagram of the bending of the outer plate of the present invention;

[0031] Figure 9 Schematic diagram of the filter screen of the present invention;

[0032] Figure 10 It is a schematic diagram of the U-shaped exhaust pipe of the present invention;

[0033] In the above figure: 1-intake pipe, 2-drag cover, 3-argon arc welding gun, 4-fixing clip, 5-inner plate, 6-outer plate, 7-rectangular hole 1, 8-bolt, 9-exhaust pipe, 10-filter fixing rod, 11-filter, 12-rectangular hole 2. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] This embodiment provides a telescopic deformation titanium alloy pipeline welding protection drag cover, such as Figures 1-10 As shown, it includes a bendable drag cover 2, an inner plate 5 and an outer plate 6; one side of the inner plate 5 and the outer plate 6 are respectively cut into vertical strips, and the inner plate 5 is a rectangular plate; the outer plate 6 is an L-shaped plate, and the first three vertical strips at both ends of the outer plate 6 are provided with a rectangular hole 7, and the first three vertical strips at both ends of the inner plate 5 are provided with a rectangular hole 2 12. The number of rectangular holes 7 and rectangular holes 12 provided on the vertical strips depends on the curvature of the bend, such as Figure 5-Figure 8 As shown; inner plates 5 are welded on both long sides of the drag cover shell 2, and rectangular holes 12 on the inner plates 5 are connected to rectangular holes 7 on the outer plates 6 by bolts 8. The connection of different hole positions realizes the bending curvature of the drag cover shell 2. The front end of the drag cover shell 2 is provided with a fixing buckle 4, which connects the argon arc welding gun 3 and the protective drag cover 2 as a whole; an air intake pipe 1 and a U-shaped exhaust pipe 9 are provided on the inner side of the drag cover shell 2, and the air intake pipe 1 extends out of the drag cover shell 2. The air intake pipe 1 and the exhaust pipe 9 are connected by bolts. The air intake pipe 1 is L-shaped, and one end of the L-shaped air intake pipe 1 is connected to the middle position of the bend of the U-shaped exhaust pipe 9. Small exhaust holes are evenly arranged on the exhaust pipe 9, such as Figure 10 As shown, the exhaust hole is facing the top of the inner cavity of the protective cover, and the argon gas enters the exhaust pipe 9 from the air inlet pipe 1 and is discharged into the inner cavity of the protective cover through the exhaust hole. Due to the principle that the mass of argon gas is greater than the mass of air, the reverse exhaust causes all the air in the inner cavity of the protective cover to be pressed out from the top, thereby ensuring the purity of the argon gas in the inner cavity of the protective cover; a copper 100-mesh filter is provided in the filling chamber between the exhaust pipe 9 and the weld, so that the gas inside the drag cover 2 is evenly discharged when it is discharged to the bottom, and the protective gas can be evenly discharged to all parts covered by the protective cover, such as the weld and the heat-affected zone.

[0036] The front and rear ends of the two inner plates 5 are respectively provided with filter fixing rods 10. The filter fixing rods 10 are set at the lower end of the filter and are used to fix the filter 11. When the drag cover adjusts the bending curvature, the positioning rods 10 ensure that the filter 11 adjusts the bending curvature synchronously. The filter 11 is set between the drag cover shell 2 and the filter fixing rods 10.

[0037] The vertical strips of the inner and outer panels 5 and 6 are evenly arranged in the middle and are equal in size. The width of the vertical strips on both sides is greater than the width of the middle vertical strip, and a fixing screw hole is set in the center of the vertical strip to achieve the adjustment of the fixed position of the two side panels of the protective cover during the bending process of the protective cover. Figure 5-Figure 8 shown.

[0038] The filter screen 11 is an L-shaped filter screen 11. Figure 9 As shown, the short side end is welded to the bottom surface of the drag cover shell 2, so that the argon gas filled in the protective cover is evenly discharged to the end of the welding gun, preventing the exhaust hole on the welding gun handle from blowing the air around the welding gun into the drag cover during welding to form a mixed gas.

[0039] The inner side panel 5 of the present invention is composed of rectangular vertical strips of uniform width. The vertical strips are staggered and stacked together, and the upper ends are welded to the upper ends of the long sides of the drag cover 2. When the drag cover 2 is in a horizontal state, the inner side panel is in a vertical state. The vertical strips of the long side panels of the drag cover 2 are staggered and pressed by 1mm to ensure that the side panels are tightly sealed. The side panels and the drag cover 2 form a filling chamber.

[0040] The outer plate 6 of the present invention is processed from a rectangular titanium plate. The rectangle is first flanged along the long side to form an L-shape, and then the L-shaped vertical plate is evenly sheared into a strip state along the vertical plate surface. The L-shaped floor is tightly sealed with the surface of the titanium alloy pipe during the argon filling process. The protective cover has different separation angles of the vertical bars of the L-shaped vertical plate according to different bending curvatures, and the bending curvature of the protective cover is adjusted in turn.

[0041] The front and rear ends of the inner plate 5 and the outer plate 6 of the present invention are respectively processed with bolt holes for positioning. According to the different bending curvatures of the protective cover, the inner long side plate 5 and the outer long side plate 6 are fixed and positioned by positioning bolts 8 through positioning bolt holes 7 to ensure that the curvature of the contact surface between the protective cover and the pipeline remains the same during welding.

[0042] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. A telescopic deformation titanium alloy pipeline welding protection drag cover, characterized in that: The invention comprises a bendable drag cover shell (2), an inner plate (5) and an outer plate (6); one side of the inner plate (5) and the outer plate (6) are respectively cut into vertical strips, and rectangular holes (7) and rectangular holes (12) are formed on the vertical strips of the outer plate (6) and the inner plate (5) according to the bending curvature of the drag cover shell; the inner plate (5) is welded to the long sides of the drag cover shell (2), and the rectangular hole (12) on the inner plate (5) is connected to the rectangular hole (7) on the outer plate (6) by bolts (8), and the connection of different hole positions realizes the drag cover shell. (2) Bending curvature, the front end of the drag cover shell (2) is provided with a fixing buckle (4), and the fixing buckle (4) connects the argon arc welding gun (3) and the drag cover shell (2) into one body; an air intake pipe (1) and an exhaust pipe (9) are provided on the inner side surface of the drag cover shell (2), the air intake pipe (1) extends out of the drag cover shell (2), the air intake pipe (1) and the exhaust pipe (9) are connected by bolts, and small exhaust holes are evenly provided on the exhaust pipe (9), and the exhaust holes are facing the top of the inner cavity of the protective cover, and a filter (11) is provided in the filling chamber between the exhaust pipe (9) and the weld; Bolt holes for positioning are respectively processed on the front and rear ends of the inner plate (5) and the outer plate (6).

2. The telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 1 is characterized in that: The front and rear ends of the two inner plates (5) are respectively provided with filter fixing rods (10), and the filter fixing rods (10) are provided at the lower end of the filter and are used to fix the filter (11).

3. A telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 1 or 2, characterized in that: The exhaust pipe (9) is U-shaped, the air intake pipe (1) is L-shaped, and one end of the L-shaped air intake pipe (1) is connected to the middle position of the bend of the U-shaped exhaust pipe (9).

4. The telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 3 is characterized in that: The vertical strips of the inner plate (5) and the outer plate (6) are evenly arranged in the middle and are equal in size, and the width of the vertical strips on both sides is greater than the width of the middle vertical strip.

5. The telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 4 is characterized in that: The inner plate (5) is a rectangular plate.

6. The telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 5, characterized in that: The outer side plate (6) is an L-shaped plate.

7. The telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 6, characterized in that: The filter screen (11) is an L-shaped filter screen (11), the short side of which is welded to the bottom surface of the drag cover shell (2).

8. The telescopic deformation titanium alloy pipeline welding protective drag cover according to claim 7, characterized in that: The filter screen (11) is a 100-mesh copper filter screen.

Images