CN107538146B

CN107538146B - Asymmetric narrow gap welding groove structure

Info

Publication number: CN107538146B
Application number: CN201610466115.9A
Authority: CN
Inventors: 王金光; 董汪平; 尹青锋; 张迎恺; 刘震宇
Original assignee: Sinopec Engineering Inc; Sinopec Engineering Group Co Ltd
Current assignee: Sinopec Engineering Inc; Sinopec Engineering Group Co Ltd
Priority date: 2016-06-23
Filing date: 2016-06-23
Publication date: 2020-07-03
Anticipated expiration: 2036-06-23
Also published as: CN107538146A

Abstract

An asymmetric narrow-gap welding groove structure is arranged between a first welding part (1) and a second welding part (6), and comprises a small-angle groove section (7), an arc connecting section (5), a groove (2) and a root gap (3) which are sequentially communicated from top to bottom; wherein the small-angle ramp section (7) is located between the end of the first weldment (1) and the inclined end of the second weldment (6); the arc connecting section (5) is positioned at the bottom of the small-angle slope section (7), and the arc of the arc connecting section (5) is adjacent to the inclined end part; the groove (2) extends from the arc connecting section (5) to one side of the first welding part (1); the root gap (3) is arranged below the groove (2) along the vertical direction. The groove structure can achieve the effects of reducing the consumption of welding materials and reducing the welding workload.

Description

Asymmetric narrow gap welding groove structure

Technical Field

The present disclosure relates to high pressure heavy vessels used in the fields of petrochemical industry, coal chemical industry, etc., and more particularly, to an asymmetric narrow gap welding groove structure for a high pressure heavy vessel.

Background

With the increasing demand for clean energy at home and abroad, deep processing devices in oil refining and coal chemical industry are also in large numbers. The deep processing device is characterized by high pressure or high temperature and hydrogen, so that a corresponding heavy container needs to be manufactured.

Heavy vessels (e.g. hydrogenation reactors) have large wall thicknesses and can weigh 1000 tons, 2000 tons or even more. If conventional welding grooves such as V-grooves or U-grooves are used for these heavy-walled vessels, the welding work is very heavy. The weld engineer has therefore developed a narrow gap welding process. The conventional narrow gap bevel is symmetrically arranged as shown in fig. 1. Symmetrical groove configurations in the form of a U, V, I or double V are also mentioned in patents CN10519593A and CN 103008851 a. Although this construction reduces the amount of welding compared to conventional welded constructions, the amount of welding material consumed is still significant for heavy-walled containers.

Therefore, a narrow gap welding groove structure capable of further reducing consumption of welding materials and welding workload is expected in the industry to meet the requirements of energy conservation and environmental protection in the current new normal state.

Disclosure of Invention

The invention aims to provide an asymmetric narrow-gap welding groove structure which can achieve the effects of reducing the consumption of welding materials and the welding workload, and can ensure the penetration and the welding quality as long as the welding is correctly carried out.

The invention adopts the following solution:

an asymmetric narrow-gap welding groove structure is arranged between a first welding part and a second welding part and comprises a small-angle groove section, an arc connecting section, a groove and a root gap which are sequentially communicated from top to bottom;

wherein the small angle notch section is located between an end of the first weldment and an inclined end of the second weldment;

the arc connecting section is positioned at the bottom of the small-angle slope section, and the arc of the arc connecting section is adjacent to the inclined end part;

the groove extends from the arc connecting section to one side of the first welding piece;

the root gap is arranged below the groove along the vertical direction.

Preferably, the groove is provided at the bottom of the first weldment.

Preferably, the inclined end of the second weldment extends toward the first weldment forming a support ledge below the groove.

Preferably, the height of the support boss is 4-5 mm.

Preferably, the ends of the first weldment are disposed in a vertical direction.

Preferably, the inclined end of the second welding part forms an included angle of 5-10 degrees with the vertical direction.

Preferably, the arc radius R of the arc connecting section is more than or equal to 10 mm.

Preferably, the width P of the root gap is 1-2 mm.

Preferably, the width C of the groove is 4-5 mm.

Preferably, the height A of the grooves is 4-5 mm.

Compared with the prior art, the invention has the beneficial effects that the end part of the thick welding part is inwards sunken to form a groove, so that the welding part can be ensured to be completely welded, the volume of the groove structure is reduced, and the effects of reducing the consumption of welding materials and reducing the welding workload are achieved.

Drawings

The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.

FIG. 1 illustrates a symmetrical narrow gap weld groove configuration according to the prior art;

FIG. 2 illustrates an asymmetric narrow gap weld notch configuration in accordance with an exemplary embodiment.

Description of the main reference numerals:

1-a first welding part, 2-a groove, 3-a root gap, 4-a supporting boss, 5-a circular arc connecting section, 6-a second welding part and 7-a small-angle notch section.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Fig. 2 illustrates an asymmetric narrow gap welding notch structure disposed between the first weldment 1 and the second weldment 6 for welding the first weldment 1 and the second weldment 6 together in accordance with an exemplary embodiment. The asymmetric narrow gap weld notch structure according to the exemplary embodiments is particularly suitable for welding thick welds having a thickness greater than 30 mm.

The asymmetric narrow gap welding groove structure according to the exemplary embodiment includes a small-angle groove section 7, a circular arc connecting section 5, a groove 2, and a root gap 3, which are sequentially communicated from top to bottom. Wherein the small-angle notch section 7 is located between the end of the first welding part 1 and the inclined end of the second welding part 6, and the opening width D of the small-angle notch section 7 is smaller, generally about 10 mm.

The circular arc connecting section 5 is positioned at the bottom of the small-angle slope section 7, and the circular arc of the circular arc connecting section is adjacent to the inclined end part of the second welding part 6 and is formed by extending the inclined end part to the first welding part 1.

The groove 2 extends from the circular arc connecting section 5 to one side of the first welding part, the width C of the groove 2 can be 4-5mm, and the height A of the groove 2 can be 4-5 mm.

The root gap 3 is arranged vertically below the groove 2.

The asymmetric narrow gap welding notch structure according to the exemplary embodiment is provided with the groove 2 extending from the circular arc connecting section 5 to the first weldment side, i.e., the end of the first weldment 1 is recessed inward, forming the groove 2. The setting of recess is guaranteed to weld through the welding piece, and the volume of groove structure reduces simultaneously to reduce and weld the material consumption, reduce welding work volume.

When the groove structure is applied to narrow gap welding, back gouging is needed after all welding work is finished, and then back sealing welding is carried out through the root gap 3, but the economy and the energy-saving effect are still obvious.

Preferably, the groove 2 is formed at the bottom of the first welding member 1, which is advantageous in that the consumption of metal material can be further reduced. If the boss structure is selected, namely the boss structure is changed from concave to convex, the size of the first welding part 1 must be increased in order to process the boss, and more metal materials are wasted.

Preferably, the inclined end of the second weldment 6 extends towards the first weldment 1, forming a support ledge 4 below the groove 2, which provides support when welding is performed.

Preferably, the height of the support boss 4 is 4-5mm, preferably 5 mm.

Preferably, the ends of the first weldment 1 are arranged in a vertical direction and the inclined ends of the second weldment 6 are at an angle of 5-10 °, preferably 7 °, to the vertical.

Preferably, the arc radius R of the arc connecting section 5 is more than or equal to 10mm, so that the groove welding stress is reduced when welding is carried out.

Preferably, the root gap 3 has a width P of 1-2mm to enable penetration of the weld when welding is performed.

Application example

The asymmetric narrow gap welding notch structure shown in fig. 2 is arranged between a first welding part 1 and a second welding part 6, and the first welding part 1 and the second welding part 6 are jointed by welding, wherein the thickness of the first welding part 1 and the second welding part 6 is 200 mm. The inclined end part forming the small-angle groove 7 forms an included angle of 7 degrees with the vertical direction, the height of the supporting boss 4 is 5mm, and the width P of the root gap is 1 mm.

The above-described embodiment is only one embodiment of the present invention, and various modifications or changes based on the principles disclosed in the present invention will be readily apparent to those skilled in the art, and the present invention is not limited to the above-described embodiment of the present invention, and therefore, the foregoing description is only preferred and not limiting.

Claims

1. An asymmetric narrow-gap welding groove structure is arranged between a first welding part (1) and a second welding part (6), and is characterized in that the groove structure comprises a small-angle groove section (7), an arc connecting section (5), a groove (2) and a root gap (3) which are sequentially communicated from top to bottom;

wherein the small angle notch section (7) is located between the end of the first weldment (1) and the inclined end of the second weldment (6);

the arc connecting section (5) is positioned at the bottom of the small-angle slope section (7), and the arc of the arc connecting section (5) is adjacent to the inclined end part;

the groove (2) extends from the circular arc connecting section (5) to one side of the first welding part (1);

the root gap (3) is arranged below the groove (2) along the vertical direction;

the inclined end of the second welding part (6) extends towards the first welding part (1) and forms a support boss (4) below the groove (2).

2. The asymmetric narrow gap welding notch structure according to claim 1, characterized in that said groove (2) is provided at the bottom of said first weldment (1).

3. The asymmetric narrow gap welding notch structure according to claim 1, wherein the height of the support boss (4) is 4-5 mm.

4. The asymmetric narrow gap welding notch structure according to claim 1, characterized in that said ends of said first weldment (1) are arranged in a vertical direction.

5. The asymmetric narrow gap welding notch structure according to claim 1, wherein the inclined end of the second welding piece (6) is at an angle of 5-10 ° to the vertical.

6. The asymmetric narrow gap welding notch structure according to claim 1, wherein the arc radius R of the arc connecting section (5) is more than or equal to 10 mm.

7. The asymmetric narrow gap welding notch structure according to claim 1, characterized in that the width P of the root gap (3) is 1-2 mm.

8. The asymmetric narrow gap welding notch structure according to claim 1, wherein the width C of said groove (2) is 4-5 mm.

9. The asymmetric narrow gap welding notch structure according to claim 1, wherein the height A of said groove (2) is 4-5 mm.