CN111468987A - Method and machine tool for adjusting orientation of welding seam surface of pipe - Google Patents

Method and machine tool for adjusting orientation of welding seam surface of pipe Download PDF

Info

Publication number
CN111468987A
CN111468987A CN202010161497.0A CN202010161497A CN111468987A CN 111468987 A CN111468987 A CN 111468987A CN 202010161497 A CN202010161497 A CN 202010161497A CN 111468987 A CN111468987 A CN 111468987A
Authority
CN
China
Prior art keywords
pipe
processed
welding seam
clamping device
machine tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010161497.0A
Other languages
Chinese (zh)
Inventor
赖碧佳
戴畅
罗贵长
陈梦桔
陈焱
高云峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Han s Laser Technology Industry Group Co Ltd
Hans Laser Smart Equipment Group Co Ltd
Original Assignee
Han s Laser Technology Industry Group Co Ltd
Hans Laser Smart Equipment Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Han s Laser Technology Industry Group Co Ltd, Hans Laser Smart Equipment Group Co Ltd filed Critical Han s Laser Technology Industry Group Co Ltd
Priority to CN202010161497.0A priority Critical patent/CN111468987A/en
Publication of CN111468987A publication Critical patent/CN111468987A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q15/00Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • B23Q15/20Automatic control or regulation of feed movement, cutting velocity or position of tool or work before or after the tool acts upon the workpiece
    • B23Q15/22Control or regulation of position of tool or workpiece
    • B23Q15/26Control or regulation of position of tool or workpiece of angular position

Abstract

The invention is suitable for the technical field of industrial automatic production, and provides a method and a machine tool for adjusting the orientation of a welding seam surface of a pipe, wherein the method comprises the following steps: fixing a pipe to be processed on a clamping device on a machine tool; checking the position of a welding seam on the pipe to be processed, and determining the angle and the rotating direction of the pipe to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe to be processed and the checked position of the welding seam; and driving the pipe to be processed to rotate by the angle along the axis of the pipe to be processed according to the rotating direction through the clamping device until the welding seam surface on the pipe to be processed faces the target direction. Compared with the prior art, the method has the advantages of simple operation, good practicability, no need of increasing hardware cost and easy popularization.

Description

Method and machine tool for adjusting orientation of welding seam surface of pipe
Technical Field
The invention belongs to the technical field of industrial automatic production, and particularly relates to a method and a machine tool for adjusting the orientation of a welding seam surface of a pipe.
Background
In the prior art, when a laser pipe cutting machine is used for machining a pipe, when an automatic feeding mechanism feeds the pipe into a clamping device of a machine tool, the orientation of a welding seam surface of the pipe is random. However, many industries have process requirements for specifying the orientation of the welding seam surface of the pipe, for example, in the furniture industry, when the parts processed by the pipe are installed on a table or a chair, the welding seam surface of the pipe is not allowed to face outwards, otherwise the appearance of the product is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a machine tool for adjusting the orientation of the welding seam surface of a pipe, and aims to achieve the purpose of adjusting the orientation of the welding seam surface of the pipe according to requirements.
In a first aspect, an embodiment of the present invention provides a method for adjusting a weld face orientation of a pipe, where the method includes:
fixing a pipe to be processed on a clamping device on a machine tool;
checking the position of a welding seam on the pipe to be processed, and determining the angle and the rotating direction of the pipe to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe to be processed and the checked position of the welding seam;
and driving the pipe to be processed to rotate by the angle along the axis of the pipe to be processed according to the rotating direction through the clamping device until the welding seam surface on the pipe to be processed faces the target direction.
Further, the clamping device drives the pipe to be processed to rotate along the axis of the pipe to be processed, and the clamping device comprises:
and controlling the clamping device to rotate by the angle corresponding to the button by clicking the button on the machine tool.
Furthermore, the machine tool is provided with a plurality of buttons, the buttons correspond to different angles respectively, and the buttons are clicked for multiple times to control the clamping device to rotate a plurality of angles in sequence until the weld on the pipe to be processed faces the target direction.
Further, the angle is 0 °, 90 °, 180 °, or 270 °.
Further, the buttons are virtual buttons.
Further, the fixing of the pipe to be processed on the clamping device on the machine tool previously comprises:
and conveying the pipe to be processed to the clamping device through an automatic feeding device.
Further, clamping device is the chuck, the chuck includes annular overcoat and sets up on the annular overcoat inner wall and follow annular overcoat inner wall circumference encircleed jack catch, treat that processing tubular product passes annular overcoat just the jack catch presss from both sides tightly treat processing tubular product.
A second aspect of the embodiments of the present invention provides a machine tool for adjusting the orientation of a weld face of a pipe, the machine tool including:
the clamping device is used for fixing the pipe to be processed;
the inspection device is used for inspecting the position of a welding seam on the pipe to be processed and determining the angle and the rotating direction of the pipe to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe to be processed and the inspected position of the welding seam;
and the control device is used for controlling the clamping device to drive the pipe to be processed to rotate by the angle along the axis of the pipe to be processed according to the rotating direction until the welding seam surface on the pipe to be processed faces the target direction.
Further, the machine tool for adjusting the orientation of the welding seam surface of the pipe also comprises an automatic feeding device;
the automatic feeding device is used for conveying the pipe to be processed to the clamping device.
Further, the control device comprises a button, and by clicking the button, the clamping device is controlled to rotate by the angle corresponding to the button.
Compared with the prior art, the invention has the beneficial effects that: after the pipe is clamped by the machine tool, the position of the welding seam surface is checked and determined, the pipe is clamped by the clamping device to rotate for a certain angle, then the machining is started, the purpose of adjusting the orientation of the welding seam surface of the pipe according to requirements is achieved, after the orientation of the welding seam surface is adjusted to meet the requirements, the machine tool starting button is pressed, and the machine tool starts machining by taking the current state of the pipe as an initial state. The method is simple to operate, good in practicability, free of increasing hardware cost and easy to popularize.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic flow chart illustrating a first embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a second embodiment of the present invention;
FIG. 3 is a schematic view of a button in a second embodiment of the invention;
FIG. 4 is a schematic structural view of a chuck and a pipe to be processed in a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a machine tool for adjusting the face orientation of a weld joint of a pipe according to a third embodiment of the invention.
In the drawings, each reference numeral denotes:
1. a pipe to be processed; 2. welding seams; 31. an annular outer sleeve; 32. a claw; 301. a clamping device; 302. an inspection device; 303. a control device; 304. an automatic feeding device.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A first embodiment of the present invention provides a method for adjusting the orientation of the weld face of a pipe, please refer to fig. 1 to 4. The manufacturing method comprises the following specific steps:
s101, fixing the pipe 1 to be processed on a clamping device 301 on a machine tool.
S102, checking the position of a welding seam 2 on a pipe 1 to be processed, and determining the angle and the rotating direction of the pipe 1 to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe 1 to be processed and the checked position of the welding seam 2;
s103, the pipe 1 to be processed is driven by the clamping device 301 to rotate by the angle along the axis of the pipe 1 to be processed according to the rotating direction until the welding seam surface on the pipe 1 to be processed faces the target direction.
In this embodiment, after the pipe is clamped by the machine tool, the position of the welding surface is checked and determined, the pipe is clamped by the clamping device 301 and rotated by a certain angle, and then the machining is started, so as to achieve the purpose of adjusting the orientation of the welding surface of the pipe as required. The method is simple to operate, good in practicability, free of increasing hardware cost and easy to popularize. The pipe 1 to be processed of this embodiment can be the symmetrical tubular product that has welding seam 2 such as pipe, square pipe, rectangular pipe, elliptical tube, oval pipe, satisfies the demand of the appointed tubular product welding seam face orientation of trades such as furniture, body-building apparatus, passenger train.
Referring to fig. 2, fig. 2 is a flow chart illustrating a second embodiment of the present invention. The method for adjusting the welding face orientation of the pipe shown in FIG. 2 mainly comprises the following steps:
s201, conveying the pipe to be processed to the clamping device through an automatic feeding device 304.
S202, fixing the pipe 1 to be processed on a clamping device on a machine tool.
As shown in fig. 4, the clamping device 301 of the present embodiment is a chuck, the chuck includes an annular outer sleeve 31 and a clamping jaw 32 disposed on an inner wall of the annular outer sleeve 31 and circumferentially surrounding along the inner wall of the annular outer sleeve 31, the pipe 1 to be processed passes through the annular outer sleeve 31, and the clamping jaw 32 clamps the pipe 1 to be processed. Alternatively, the number and position of the jaws 32 on the inner wall of the annular jacket 31 can be adjusted according to the shape of the tube 1 to be processed. For example, if the pipe 1 to be processed is a rectangular pipe or a square pipe, the number of the clamping jaws 32 may be four, and the four side surfaces of the rectangular pipe or the square pipe are respectively clamped, so as to improve the stability of clamping and fixing by the clamping device 301.
S203, checking the position of a welding seam 2 on the pipe 1 to be processed, and determining the angle and the rotating direction of the pipe 1 to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe 1 to be processed and the checked position of the welding seam 2;
in a feasible implementation manner, the position of the welding seam 2 on the pipe material 1 to be processed can be observed by an operator to determine the angle and the rotating direction of the pipe material to be processed, which need to be adjusted. After the clamping device 301 clamps the pipe, the system automatically determines whether to enter the pipe welding seam face orientation adjustment process according to the selection of the user. After entering the process, the machine tool automatically pauses to wait for manual inspection of the orientation of the welding seam surface of the pipe, and determines the angle and the rotating direction which need to be adjusted. On the premise of automatic feeding, the orientation of the welding line surface of the pipe 1 to be processed on the clamping device 301 is arbitrary, and at the moment, the position of the welding line on the pipe can be observed by an operator, and the angle and the rotating direction of the pipe 1 to be processed, which need to be adjusted, are determined according to the target orientation of the welding line surface on the pipe 1 to be processed. For example, assuming that after the automatic feeding is completed, the welding surface of the pipe 1 to be processed on the clamping device 301 faces directly downward, and the target orientation of the welding surface of the pipe 1 to be processed is vertically upward, the angle to be adjusted of the pipe 1 to be processed is 180 °, and the rotation direction may be clockwise rotation or counterclockwise rotation. The method for adjusting the orientation of the welding seam surface of the pipe has the advantages that the situation that the adjustment is not in place is reduced to the greatest extent through a manual intervention semi-automatic adjusting mode, and compared with the method for appointing the orientation of the welding seam surface through a pure manual feeding mode, the method for adjusting the orientation of the welding seam surface of the pipe is higher in efficiency. Of course, in other embodiments, the position of the weld on the pipe 1 to be processed may also be determined by a machine, such as a sensor or the like.
S204, the pipe 1 to be processed is driven by the clamping device 301 to rotate by the angle along the axis of the pipe 1 to be processed according to the rotating direction until the welding seam surface on the pipe 1 to be processed faces the target direction.
By clicking a button on the machine tool, the clamping device 301 is controlled to rotate by an angle corresponding to the button on the machine tool, so that the aim of adjusting the orientation of the welding seam surface of the pipe to be processed is fulfilled. Specifically, as shown in fig. 3, a plurality of buttons are arranged on the machine tool, the plurality of buttons correspond to different angles respectively, and the clamping device 301 is controlled to rotate by a plurality of angles in sequence by clicking the buttons for a plurality of times until the weld seam on the pipe to be processed faces the target direction. Optionally, the angle corresponding to the button on the machine tool is 0 °, 90 °, 180 °, or 270 °. Assuming that the pipe to be processed needs to be rotated by 180 degrees clockwise to enable the welding line to face the target direction, the button for rotating by 180 degrees on the machine tool can be clicked once, the pipe to be processed directly rotates to the position once, the button for rotating by 90 degrees on the machine tool can also be clicked twice, and the pipe to be processed rotates to the position after rotating by 90 degrees twice. In the embodiment, the buttons on the machine tool are virtual buttons, and no additional wiring is needed, so that the manufacturing cost of the machine tool can be reduced, and the failure rate of the machine tool can be reduced. Of course, in other embodiments, the virtual buttons may be replaced by a customized operation box, and the installation position of the operation box is no longer limited near the operation panel, so as to facilitate the operation of the operator.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a machine tool for adjusting the weld face orientation of a pipe according to a third embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown. The machine tool for adjusting the face orientation of the pipe weld illustrated in fig. 5 may be an executive body of the method for adjusting the face orientation of the pipe weld provided in the foregoing first embodiment. The machine tool for adjusting the welding face orientation of the pipe illustrated in fig. 5 mainly comprises:
the clamping device 301 is used for fixing the pipe 1 to be processed;
the inspection device 302 is used for inspecting the position of the welding seam 2 on the pipe 1 to be processed, and determining the angle and the rotating direction of the pipe 1 to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe 1 to be processed and the inspected position of the welding seam 2;
and the control device 303 is used for controlling the clamping device 301 to drive the pipe 1 to be processed to rotate by an angle along the axis of the pipe 1 to be processed according to the rotating direction until the welding seam surface on the pipe 1 to be processed faces the target direction.
And the automatic feeding device 304 is used for conveying the pipe 1 to be processed to the clamping device 301.
The control means 303 comprises a button, by clicking on the button, the clamping means 301 is controlled to rotate by an angle corresponding to the button.
The specific process of each device for realizing its function can refer to the related content of the method for adjusting the orientation of the welding seam surface of the tube provided by the first embodiment, and is not described herein again.
In the embodiment of the invention, after a pipe is clamped by a machine tool, the position of a welding seam surface is checked and determined, the pipe is clamped by the clamping device 301 and rotated for a certain angle, then the machining is started, the aim of adjusting the orientation of the welding seam surface of the pipe as required is achieved, after the orientation of the welding seam surface is adjusted to meet the requirement, a machine tool starting button is pressed, and the machine tool starts machining by taking the current state of the pipe as an initial state. The method is simple to operate, good in practicability, free of increasing hardware cost and easy to popularize.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A method for adjusting the orientation of the welding seam surface of a pipe is characterized by comprising the following steps:
fixing a pipe to be processed on a clamping device on a machine tool;
checking the position of a welding seam on the pipe to be processed, and determining the angle and the rotating direction of the pipe to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe to be processed and the checked position of the welding seam;
and driving the pipe to be processed to rotate by the angle along the axis of the pipe to be processed according to the rotating direction through the clamping device until the welding seam surface on the pipe to be processed faces the target direction.
2. The method for adjusting the weld face orientation of a pipe according to claim 1, wherein the rotating the pipe to be processed along the axis of the pipe to be processed by the clamping device comprises:
and controlling the clamping device to rotate by the angle corresponding to the button by clicking the button on the machine tool.
3. The method for adjusting the orientation of the welding seam of the pipe material as claimed in claim 2, wherein a plurality of said buttons are arranged on the machine tool, the plurality of said buttons correspond to different said angles respectively, and the clamping device is controlled to rotate a plurality of said angles in sequence by clicking the buttons for a plurality of times until the welding seam on the pipe material to be processed faces the target orientation.
4. A method of adjusting the face orientation of a tubular weld according to claim 3, wherein the angle is 0 °, 90 °, 180 °, or 270 °.
5. A method of adjusting the face orientation of a tubular weld according to claim 2, wherein the button is a virtual button.
6. The method of adjusting the weld face orientation of a pipe as claimed in claim 1, wherein said securing the pipe to be processed to a fixture on a machine tool further comprises:
and conveying the pipe to be processed to the clamping device through an automatic feeding device.
7. The method of adjusting the weld face orientation of a tubular product of claim 1, wherein the clamping device is a chuck including an annular outer sleeve and jaws disposed on and circumferentially surrounding an inner wall of the annular outer sleeve, the tubular product to be processed passing through the annular outer sleeve and the jaws clamping the tubular product to be processed.
8. A machine tool for adjusting the face orientation of a weld in a pipe, the machine tool comprising:
the clamping device is used for fixing the pipe to be processed;
the inspection device is used for inspecting the position of a welding seam on the pipe to be processed and determining the angle and the rotating direction of the pipe to be processed, which need to be adjusted, according to the target orientation of the welding seam surface on the pipe to be processed and the inspected position of the welding seam;
and the control device is used for controlling the clamping device to drive the pipe to be processed to rotate by the angle along the axis of the pipe to be processed according to the rotating direction until the welding seam surface on the pipe to be processed faces the target direction.
9. The machine for adjusting the face orientation of a weld of pipe material of claim 8, further comprising an automatic feed device;
the automatic feeding device is used for conveying the pipe to be processed to the clamping device.
10. A machine tool for adjusting the face orientation of a weld of tubular material according to claim 8, wherein the control device includes a button which, by clicking on the button, controls the clamping device to rotate by the angle corresponding to the button.
CN202010161497.0A 2020-03-10 2020-03-10 Method and machine tool for adjusting orientation of welding seam surface of pipe Pending CN111468987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010161497.0A CN111468987A (en) 2020-03-10 2020-03-10 Method and machine tool for adjusting orientation of welding seam surface of pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010161497.0A CN111468987A (en) 2020-03-10 2020-03-10 Method and machine tool for adjusting orientation of welding seam surface of pipe

Publications (1)

Publication Number Publication Date
CN111468987A true CN111468987A (en) 2020-07-31

Family

ID=71748166

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010161497.0A Pending CN111468987A (en) 2020-03-10 2020-03-10 Method and machine tool for adjusting orientation of welding seam surface of pipe

Country Status (1)

Country Link
CN (1) CN111468987A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113510533A (en) * 2021-04-25 2021-10-19 中建八局第二建设有限公司 Control method of bridge cutting and processing machine tool

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08168938A (en) * 1994-12-19 1996-07-02 Tokai Rika Co Ltd Positioning device for seam welded steel pipe
CN203862729U (en) * 2014-05-16 2014-10-08 无锡信捷电气股份有限公司 Visual detection and adjusting device for steel pipe welding position
CN104251885A (en) * 2013-06-26 2014-12-31 宝山钢铁股份有限公司 Adjustment method of position deviation of welded pipe welding line and ultrasonic flaw detection dolly
CN104275658A (en) * 2013-07-11 2015-01-14 艾默生过程控制流量技术有限公司 Bearing component for industrial defect detection
CN105195938A (en) * 2015-10-30 2015-12-30 无锡汉神电气有限公司 Pipe prefabrication automatic welding system
CN205551506U (en) * 2016-04-29 2016-09-07 河北创力机电科技有限公司 Portable mechanical tubes clamping device
CN106705906A (en) * 2017-03-22 2017-05-24 镇江市恒源汽车零部件有限公司 Weld joint detection device
JP2018155491A (en) * 2017-03-15 2018-10-04 Jfeスチール株式会社 Measuring apparatus for welded pipe geometry

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08168938A (en) * 1994-12-19 1996-07-02 Tokai Rika Co Ltd Positioning device for seam welded steel pipe
CN104251885A (en) * 2013-06-26 2014-12-31 宝山钢铁股份有限公司 Adjustment method of position deviation of welded pipe welding line and ultrasonic flaw detection dolly
CN104275658A (en) * 2013-07-11 2015-01-14 艾默生过程控制流量技术有限公司 Bearing component for industrial defect detection
CN203862729U (en) * 2014-05-16 2014-10-08 无锡信捷电气股份有限公司 Visual detection and adjusting device for steel pipe welding position
CN105195938A (en) * 2015-10-30 2015-12-30 无锡汉神电气有限公司 Pipe prefabrication automatic welding system
CN205551506U (en) * 2016-04-29 2016-09-07 河北创力机电科技有限公司 Portable mechanical tubes clamping device
JP2018155491A (en) * 2017-03-15 2018-10-04 Jfeスチール株式会社 Measuring apparatus for welded pipe geometry
CN106705906A (en) * 2017-03-22 2017-05-24 镇江市恒源汽车零部件有限公司 Weld joint detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113510533A (en) * 2021-04-25 2021-10-19 中建八局第二建设有限公司 Control method of bridge cutting and processing machine tool

Similar Documents

Publication Publication Date Title
CN204397135U (en) Pipe with small pipe diameter inner wall overlaying device
US7434718B2 (en) Device for cutting or welding tubular workpieces or the like
CN113909766B (en) Intersecting line weld joint welding equipment and method
CN104084736A (en) Welding clamp suitable for butt joint of circular welds
JP6110002B1 (en) Steel aggregate welding system and steel aggregate welding method
KR20150005230A (en) A flange welding device and welding method using the same
JP5074315B2 (en) Welding apparatus and welding method
CN205254438U (en) Butt joint pipe fitting laser welding device
CN103464867B (en) Bimetallic mechanical multiple tube pipe end inner wall overlaying device
CN102161146A (en) Manufacturing method of elbow
CN214444301U (en) Pipe butt welding machine
KR20170143270A (en) Vertical type welding apparatus for 3D pipe circle welding of car
CN111468987A (en) Method and machine tool for adjusting orientation of welding seam surface of pipe
CN108747195B (en) Welding tool
CN104002015A (en) Vertical type circular seam automatic pipe welder
CN105414751A (en) Butt-joint pipe fitting laser welding device and welding method
CN205363073U (en) Mouth of pipe butt joint anchor clamps
CN205032832U (en) Welding system coordinates in two robots
KR101028386B1 (en) Rotary welding apparatus
CN203831066U (en) Pipe end machining device
CN103084667B (en) Reinforcing bar crator cutter
CN104368894B (en) Large diameter tubular metalwork girth welding self-centering system and using method thereof
CN105014389A (en) Pipe fitting machining device
CN210281030U (en) Non-rotating shaft circular seam welding equipment
CN102626842A (en) Welding method for circular seam of mitre elbow pipeline casing

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200731

RJ01 Rejection of invention patent application after publication