CN-122007582-A - Circular welding device for pressure vessel pipeline

CN122007582ACN 122007582 ACN122007582 ACN 122007582ACN-122007582-A

Abstract

The invention relates to the technical field of pressure vessel pipeline welding, in particular to a girth welding device of a pressure vessel pipeline, which comprises a central pipe support, wherein a top pressure welding mechanism is arranged in the middle of the central pipe support, centering guide mechanisms which are abutted against the inner wall of a main steel pipe are arranged on the front side and the rear side of the top pressure welding mechanism, and a welding seam detection unit is arranged at the bottom of the central pipe support; the top pressure welding mechanism is composed of an upper conductive top pressure device and a lower top pressure positioner which are respectively arranged at the top and the bottom of the central pipe support, wherein the upper conductive top pressure device upwards presses the welding lining ring to enable the lower end curved surface of the upper conductive top pressure device in a pressed state to be completely matched with the inner wall curved surface of the pipe cavity of the main steel pipe, and the outer wall of the welding lining ring is in interference fit with the inner wall of the opening of the main steel pipe. According to the invention, the welding device is arranged in the main steel pipe, the upper conductive jacking device is utilized to jack the welding lining ring and is matched with the resistance fusion welding process, so that the accurate welding of the inner joints of the main steel pipe and the branch steel pipe is realized, and the blind area that the inner joints cannot be covered by the traditional external welding is filled.

Inventors

ZHANG WEICHAO
DONG CHANGFENG
LIU TONGTAO
Bi Zhixuan
MENG MING
WEN ZHIHAO

Assignees

淄博市特种设备检验研究院

Dates

Publication Date: 20260512
Application Date: 20260416

Claims (9)

1. The device is arranged in a main steel pipe and is used for realizing the welding of the internal joint of the main steel pipe and a branch steel pipe which are in butt joint, wherein the inner end of the branch steel pipe is movable and sealed to extend into an opening matched with the top of the main steel pipe in a butt joint state, a welding lining ring is glued on the inner end surface of the branch steel pipe in advance, and the resistivity of the welding lining ring is higher than that of the main steel pipe and the branch steel pipe; The device comprises a central pipe support, wherein a top pressure welding mechanism is arranged in the middle of the central pipe support, and centering guide mechanisms which are abutted against the inner wall of a main steel pipe are arranged on the front side and the rear side of the top pressure welding mechanism; The upper conductive jacking device jacks up the welding lining ring to enable the lower end curved surface of the welding lining ring in a jacked state to be completely matched with the inner wall curved surface of the pipe cavity of the main steel pipe, and the outer wall of the welding lining ring is in interference fit with the inner wall of the opening of the main steel pipe; and when the upper conductive jacking device is electrified, the resistance heat melts the welding lining ring, and the melted welding lining ring forms metallurgical bonding with the lower end surface of the branch steel pipe and the side wall of the opening of the main steel pipe respectively under pressure.
2. The girth welding device according to claim 1, wherein after the main steel pipe and the branch steel pipe are butted in place and before the device works, spot welding fixation or full welding positioning is performed on the external butt joint of the main steel pipe and the branch steel pipe as required; the main steel pipe and the branch steel pipe in the butt joint state are kept relatively fixed in the clamping equipment state.
3. The girth welding device of claim 2, wherein the upper conductive jacking device comprises upper jacking cylinders which are fixedly arranged at the top of the central pipe frame at intervals, the upper jacking cylinders synchronously stretch, the tops of the stretching ends of the upper jacking cylinders are fixedly connected to the bottoms of the semi-cylindrical upper conductive pressure heads respectively, and the curved surfaces of the tops of the upper conductive pressure heads are used for being closely matched with the curved surfaces of the inner walls of the main steel pipes in a fitting mode and for jacking, conducting and heating the welding lining rings.
4. The girth welding device of claim 3, wherein the lower jacking positioner comprises lower jacking cylinders fixedly arranged at the bottom of the central pipe frame at intervals, the lower jacking cylinders synchronously stretch, the bottoms of the stretching ends of the lower jacking cylinders are fixedly connected to the bottoms of the semi-cylindrical lower jacking heads respectively, and the bottom curved surfaces of the lower jacking heads are used for being closely matched with the inner wall curved surfaces of the main steel pipes.
5. The girth welding device according to claim 4, wherein the upper conductive pressure head is made of a non-stick solder Jin Caizhi with resistivity lower than that of the welding backing ring, specifically one of chromium-zirconium-copper alloy, beryllium-cobalt-copper alloy and tungsten-copper alloy; The main steel pipe and the branch steel pipes are steel for the Q345R pressure vessel, and the welding lining ring is made of nichrome.
6. The girth welding device of claim 5, wherein the centering and guiding mechanism comprises two-way telescopic electric cylinders respectively horizontally arranged above and below the center pipe frame, two telescopic ends of the two-way telescopic electric cylinders synchronously extend and retract, respectively, penetrate through positioning lug seats at corresponding positions of the two-way telescopic electric cylinders and extend to the outer sides of the two-way telescopic electric cylinders and are connected with spherical rollers, each spherical roller is respectively and movably abutted against the inner wall of the main steel pipe, and two ends of a cylinder barrel of each two-way telescopic electric cylinder are respectively and movably abutted against end faces of the corresponding positioning lug seats.
7. The girth welding device of claim 6, wherein the welding seam detecting unit comprises a mounting seat fixed at the bottom of the central pipe support at the rear side of the upper conductive top presser, a plurality of industrial cameras provided with light sources are arranged at intervals at the bottom of the mounting seat, and each industrial camera is matched with the corresponding industrial camera to realize appearance detection of the welding seam and upload detection information.
8. The girth welding device of claim 7, wherein a cleaning fan is fixed at the bottom of the central pipe frame at the front side of the upper conductive jacking device, a plurality of air outlets of the cleaning fan are arranged along the width direction of the main steel pipe, and all the air outlets are arranged towards the welding seam and used for cleaning the welding seam.
9. The girth welding apparatus of claim 8, wherein the center tube stand is provided with a hollow interior for routing a wire harness used in the apparatus.

Description

Circular welding device for pressure vessel pipeline Technical Field The invention relates to the technical field of pressure vessel pipeline welding, in particular to a girth welding device for pressure vessel pipelines. Background The pressure vessel pipeline is used as a core pressure-bearing member of pressure-bearing special equipment, is a key carrier of a medium conveying system in the field of high-pressure working conditions such as chemical industry, oil gas gathering and conveying, and has the irreplaceable functions of ensuring pressure-bearing sealing of the system, controlling conveying working conditions and ensuring long-period safe and stable operation in the medium conveying process. At present, the main flow of pipeline welding is mainly external girth welding, although some integrated pipelines can reduce welding procedures, in a pipeline system of a high-pressure vessel, butt girth welding of a horizontal main steel pipe and a branch steel pipe (an included angle between the two pipes in a butt joint state of the horizontal main steel pipe and the branch steel pipe is generally 0-90 degrees, and the included angles are different under different working condition demands) is still an irreplaceable core processing mode. For example, the structural strength and sealing performance of the pipelines such as the high-pressure medium diversion pipeline and the oil-gas gathering and transportation high-pressure steel pipe are guaranteed through ring welding. In the traditional annular welding processing of the pressure vessel pipeline, a manual handheld welding gun or a multi-shaft welding mechanical arm is mostly adopted to weld an external annular welding seam of a butt joint part of the pipeline. However, this welding method in the prior art has the following disadvantages in the welding process of the main steel pipe and the branch steel pipe with the inclined included angle: firstly, the conventional pipe diameter cannot accommodate personnel, manual internal welding cannot be realized, and the existing mechanical equipment can only finish external welding, so that the quality of the full-welding weld joint required by the high-pressure working condition cannot be ensured; in addition, even if some small-amplitude extending type machining mechanical arms exist, the operation can be completed only in the inner space of the near end of the pipe, the welding arms cannot extend continuously due to limited actions, and the accessibility and track suitability of a welding gun are poor. Thirdly, especially when the included angle between the branch steel pipe and the main steel pipe is smaller than 30 degrees, the welding gun of the existing apparatus is easy to interfere with the pipe wall, the penetration uniformity of the full girth weld cannot be ensured, and the defects of incomplete penetration and undercut are easy to occur. Based on the welding device, the invention designs a circular welding device which can be suitable for welding the inner butt joint of various types of pipelines within the range of 0-90 degrees of butt joint included angle and realize the accurate circular welding of the inner circular joint of the butt joint part of the main steel pipe and the branch steel pipe of the pressure vessel. Disclosure of Invention The invention aims to solve one of the technical problems, and adopts the technical scheme that the annular welding device of the pressure vessel pipeline is arranged in a main steel pipe and is used for realizing the welding of the inner joint of the main steel pipe and a branch steel pipe which are in butt joint, wherein the inner end of the branch steel pipe is movable and sealed to extend into an opening matched with the top of the main steel pipe in the butt joint state, a welding lining ring is glued on the inner end surface of the branch steel pipe in advance, and the resistivity of the welding lining ring is higher than that of the main steel pipe and the branch steel pipe; The device comprises a central pipe support, wherein a top pressure welding mechanism is arranged in the middle of the central pipe support, and centering guide mechanisms which are abutted against the inner wall of a main steel pipe are arranged on the front side and the rear side of the top pressure welding mechanism; The upper conductive jacking device jacks up the welding lining ring to enable the lower end curved surface of the welding lining ring in a jacked state to be completely matched with the inner wall curved surface of the pipe cavity of the main steel pipe, and the outer wall of the welding lining ring is in interference fit with the inner wall of the opening of the main steel pipe; and when the upper conductive jacking device is electrified, the resistance heat melts the welding lining ring, and the melted welding lining ring forms metallurgical bonding with the lower end surface of the branch steel pipe and the side wall of the opening of the main steel pipe respectivel