Groove structure for solving problems of penetration welding and back gouging

Abstract

The utility model discloses a groove structure for solving penetration welding and back gouging, which comprises a boiler barrel and an inner extending pipe, the inner extending pipe penetrates through the barrel wall of the boiler barrel, an annular U-shaped groove is arranged on the boiler barrel, an upper bulge and a lower bulge are arranged on one side, close to the inside of the boiler barrel, of the U-shaped groove, the upper bulge comprises an upper truncated edge, the lower bulge comprises a lower truncated edge, and the lower truncated edge is arranged on the boiler barrel. The width of the U-shaped groove is gradually increased from the upper truncated edge to the lower truncated edge, the width of the lower truncated edge is 2-3 times that of the upper truncated edge, and a root radius is arranged at the position, close to the truncated edge, of the U-shaped groove. The boiler barrel has the advantages that the upper protrusions and the lower protrusions are arranged on the sides, close to the interior of the boiler barrel, of the U-shaped grooves; the position of a backing weld is changed from the thick middle part of the cylinder wall to the inner wall side of the cylinder, so that a back gouging operation space and a polishing space are increased; the width of the upper truncated edge is 2mm, and the width of the lower truncated edge is 5mm; the upper truncated edge is gradually widened from the upper truncated edge to the lower truncated edge, the narrower upper truncated edge corresponds to the shorter upper groove length, and the wider lower truncated edge corresponds to the wider lower groove length, so that through welding can be ensured during backing welding with the inner extending pipe.

Description

Technical Field

[0001] The utility model relates to the field of welding grooves, in particular to a groove structure for solving the problems of welding penetration and root cleaning. Background Art

[0002] The blunt edge of the non-radial hole X-shaped groove of the boiler drum is relatively thick, which makes it difficult to penetrate the base welding. Moreover, after welding with the connecting pipe, the angle of some base welds becomes smaller, which makes it inconvenient to clean the root and grind with carbon arc air planer.

[0003] On the other hand, the lengths of the upper and lower grooves opened horizontally on the side of the boiler drum are inconsistent, and the required welding heat is different. However, the different welding heat cannot adapt to the fixed blunt edge width, which will cause some welds to be unable to penetrate or penetrate. It is necessary to design a groove to solve the penetration and root cleaning and grinding on the back of the base weld. Utility Model Content

[0004] The utility model aims to provide a groove structure for solving the problems of penetration welding and root cleaning, so as to solve the technical problem that the variable groove length is not suitable for the fixed blunt edge width.

[0005] In order to solve the above technical problems, the utility model provides a groove structure for solving the problems of welding penetration and root cleaning, which includes a boiler drum and an inner extension pipe, the inner extension pipe passes through the barrel wall of the boiler drum, and the boiler drum is provided with an annular U-shaped groove, and the U-shaped groove is provided with an upper protrusion and a lower protrusion on the side close to the inside of the boiler drum, the upper protrusion includes an upper blunt edge, and the lower protrusion includes a lower blunt edge. The upper blunt edge to the lower blunt edge of the U-shaped groove gradually widens, the width of the lower blunt edge is 2-3 times that of the upper blunt edge, and the U-shaped groove is provided with a root radius near the blunt edge.

[0006] Furthermore, the drum and the inner extension pipe are welded by arc welding using a DC welding machine.

[0007] Furthermore, the groove surface angle of the U-shaped groove is 15°-20°.

[0008] Furthermore, the width of the upper blunt edge is 2 mm, and the width of the lower blunt edge is 5 mm.

[0009] Furthermore, the root radius is 6-10 mm.

[0010] Furthermore, the diameter of the drum is 2000 mm and the thickness is 76 mm, the outer diameter of the inner extension pipe is 76 mm, and the inner diameter of the inner extension pipe is 15.2 mm.

[0011] Furthermore, the distance from the upper blunt edge to the lower blunt edge of the U-shaped groove is 82 mm.

[0012] The beneficial effects of the utility model are as follows: a groove structure for solving the problems of welding penetration and root cleaning is compared with the prior art, and an annular U-shaped groove of the drum is processed, and an upper bulge and a lower bulge are arranged on one side of the U-shaped groove close to the inside of the drum; the position of the bottom weld is changed from the middle of the drum wall thickness to the inner wall side of the drum, and the root cleaning operation space and grinding space are increased; the upper bulge includes an upper blunt edge with a width of 2mm, and the lower bulge includes a lower blunt edge with a width of 5mm; the upper blunt edge to the lower blunt edge of the U-shaped groove gradually widens, and as the width of the blunt edge increases, its protective effect on root burn-through is correspondingly enhanced, and the narrower upper blunt edge corresponds to a wider The short upper bevel length, the width of the lower blunt edge is 2-3 times of the upper blunt edge, and the wider lower blunt edge corresponds to the wider lower bevel length, to ensure that the weld can be penetrated during the base welding with the inner extension pipe. The staff will first perform the base welding. After the base welding is completed, the defects will be cleaned up. After cleaning and grinding the surface to be welded, welding will be performed on the back of the workpiece. The protruding length of the blunt edge varies according to the position, to ensure that the weld can be penetrated during the base welding with the pipe, to avoid welding through during the base welding with the pipe, and at the same time, the position of the base weld is changed from the middle of the cylinder wall thickness to the inner wall side of the cylinder, to increase the root cleaning operation space and grinding space, and improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of the groove of this application.

[0014] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the boiler drum and inner extension pipe in the welding state of this application.

[0015] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the boiler drum and inner extension pipe after root cleaning in this application.

[0016] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the groove of this application.

[0017] Figure 5 It is a schematic diagram of the longitudinal cross-sectional structure of the groove welding state in the prior art.

[0018] Figure 6 The figure is a schematic diagram of the longitudinal cross-sectional structure of the boiler drum and the inner extension pipe after the root cleaning in the prior art.

[0019] Among them: 1. Boiler drum; 2. Inner extension pipe; 3. Upper blunt edge; 4. Lower blunt edge; 5. X-shaped groove; 6. U-shaped groove; 7. Lower protrusion; 8. Upper protrusion; 9. Root radius; 10. Upslope edge; 11. Downslope edge. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiment is only one embodiment of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0021] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0023] In this embodiment, if Figure 1 As shown, the groove structure includes a drum 1 and an inner extension pipe 2, the inner extension pipe 2 passes through the wall of the drum 1, and the drum 1 and the inner extension pipe 2 are welded by arc welding. The process flexibility of arc welding is its remarkable feature. Arc welding is easy to operate and has strong adaptability. It can adapt to the welding groove form of the inner extension pipe 2 and the drum 1. Through DC welding, an annular U-shaped groove 6 is provided on the drum 1; the prior art adopts an X-shaped groove 5. In order to prevent welding through, the blunt edge used is thicker, and it is not easy to penetrate the base welding. Moreover, after welding with the pipe, the angle of some base welds becomes smaller, which is not convenient for carbon arc air planing and grinding.

[0024] The U-shaped groove 6 is provided with an upper protrusion 8 and a lower protrusion 7 on one side close to the inside of the drum 1; the position of the base weld is changed from the middle of the drum wall thickness to the inner wall side of the drum, increasing the root cleaning operation space and grinding space; the groove surface angle of the U-shaped groove 6 is 15°-20°; the upper protrusion 8 includes an upper blunt edge 3, whose width is 2mm, and the lower protrusion 7 includes a lower blunt edge 4, whose width is 5mm; the upper blunt edge 3 to the lower blunt edge 4 of the U-shaped groove 6 gradually widens, and as the width of the blunt edge increases, its protective effect on root burn-through is also correspondingly enhanced, the narrower upper blunt edge 3 corresponds to the shorter upper groove 10 length, the lower blunt edge 4 is 2-3 times the width of the upper blunt edge 3, and the wider lower blunt edge 4 corresponds to the wider lower groove 11 length, ensuring that it can be welded through when bottoming with the inner extension pipe 2, and the U-shaped groove 6 is provided with a root radius 9 near the blunt edge, and its radius is 6-10mm.

[0025] The diameter of the drum 1 is 2000 mm, the thickness is 76 mm, the outer diameter of the inner extension tube 2 is 76 mm, the inner diameter of the inner extension tube 2 is 15.2 mm, and the distance from the upper blunt edge 3 to the lower blunt edge 4 of the U-shaped groove 6 is 82 mm.

[0026] Preferred embodiments:

[0027] Root radius 9: R1 = 8mm, upper blunt edge 3: d1 = 2mm, lower blunt edge 4: d2 = 5mm, groove surface angle: α = 17°, interval from upper blunt edge 3 to lower blunt edge 4: d3 = 86mm; inner diameter of inner extension tube 2: D2 = 15.2mm; outer diameter of inner extension tube 2: D1 = 76mm; under the parameters of the U-shaped groove 6, the root cleaning and grinding effects of the weld between the drum 1 and the inner extension tube 2 are better, the welding penetration effect is good, and welding penetration is not easy to occur.

[0028] Workflow: After processing the annular U-shaped groove 6 of the boiler drum 1, the staff will first perform the base welding. After the base welding is completed, the defects will be cleaned. After cleaning and grinding the surface to be welded, welding will be performed on the back of the workpiece. The blunt edge has different protruding lengths according to different positions to ensure that it can be welded through during the base welding with the pipe to avoid welding through during the base welding with the pipe. At the same time, the position of the base weld is changed from the middle of the cylinder wall thickness to the inner wall side of the cylinder to increase the root cleaning operation space and grinding space, thereby improving the welding quality.

[0029] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A groove structure for solving penetration and root cleaning, characterized by: It includes a boiler drum and an inner extension tube, the inner extension tube passes through the drum wall of the boiler drum, the boiler drum is provided with an annular U-shaped groove, the U-shaped groove is provided with an upper protrusion and a lower protrusion on the side close to the inside of the boiler drum, the upper protrusion includes an upper blunt edge, the lower protrusion includes a lower blunt edge, the U-shaped groove gradually widens from the upper blunt edge to the lower blunt edge, the width of the lower blunt edge is 2-3 times that of the upper blunt edge, and the U-shaped groove is provided with a root radius near the blunt edge.

2. A groove structure for solving penetration and root cleaning according to claim 1, characterized in that: The drum and the inner extension pipe are welded by arc welding with a DC welding machine.

3. A groove structure for solving penetration and root cleaning according to claim 1, characterized in that: The groove surface angle of the U-shaped groove is 15°-20°.

4. A groove structure for solving penetration and root cleaning according to claim 1, characterized in that: The width of the upper blunt edge is 2 mm, and the width of the lower blunt edge is 5 mm.

5. A groove structure for solving penetration and root cleaning according to claim 1, characterized in that: The root radius is 6-10 mm.

6. A groove structure for solving penetration and root cleaning according to claim 1, characterized in that: The diameter of the boiler drum is 2000 mm and the thickness is 76 mm. The outer diameter of the inner extension tube is 76 mm and the inner diameter of the inner extension tube is 15.2 mm.

7. A groove structure for solving penetration and root cleaning according to claim 1, characterized in that: The distance from the upper blunt edge to the lower blunt edge of the U-shaped groove is 82 mm.

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