Weld protection device and pipe welding method

Abstract

The present invention discloses a weld protection device and a pipe welding method. When performing longitudinal seam welding, a welding operator welds the longitudinal seam on the outside of the pipe, and uses a traction rope to support the longitudinal seam protection cover to move synchronously, so as to ensure that the longitudinal seam protection cover is protected by argon gas on the back side of the longitudinal seam; when performing circumferential seam welding, the pipe is driven to rotate, and the sliding bracket remains relatively fixed in the pipe, so that the circumferential seam protection cover is maintained at a preset height, and a welding operator maintains the welding gun between the upper and lower boundaries of the circumferential seam protection cover on the outside of the pipe, so as to ensure that the circumferential seam protection cover is protected by argon gas on the back side of the circumferential seam. The weld protection device and pipe welding method disclosed in the present invention only require one welding operator, save labor, improve welding efficiency, and also help improve welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of pipe welding, and in particular to a weld protection device and a pipe welding method. Background Art

[0002] Pipe fittings are often welded using argon arc welding. Pipe fittings have longitudinal seams along the axial direction and circumferential seams along the circumferential direction. When performing argon arc welding on large-diameter pipe fittings (pressure vessels), argon gas protection is required on the back of the weld to prevent the weld from being oxidized and affecting the weld quality.

[0003] In the prior art, argon protection is usually performed by manually holding a protective cover in the pipe. Therefore, two operators are required to cooperate with each other, that is, one person holds the protective cover inside the pipe, and the other person welds outside the pipe. In order to ensure the welding quality, the internal protection personnel and the external welding operator are also required to move synchronously, which is a great test of the internal protection personnel's physical strength and energy, has low efficiency, and is also easy to affect the welding quality.

[0004] In view of this, it is necessary to provide a weld protection device and a pipe welding method which can save operators, have high efficiency and good welding quality. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a weld protection device and a pipe welding method which can save operators, have high efficiency and good welding quality.

[0006] The technical solution of the present invention provides a weld protection device, the weld protection device includes a longitudinal seam protection mechanism for protecting the longitudinal seam of the pipe along the axial direction; and / or, the weld protection device includes an annular seam protection mechanism for protecting the annular seam of the pipe along the circumferential direction;

[0007] The longitudinal seam protection mechanism comprises a fixing bracket for fixedly installing in the pipe and a longitudinal seam protection cover slidably arranged on the fixing bracket and capable of sliding along the axial direction of the pipe;

[0008] The annular gap protection mechanism comprises a sliding bracket which is used to be arranged in the pipe and can slide relative to the pipe along the circumferential direction, and an annular gap protection cover installed on the sliding bracket.

[0009] In one of the optional technical solutions, the fixing bracket includes two fixing clamps for clamping with the ends of the pipe, a tray connected between the two fixing clamps, and a guide rail installed on the tray;

[0010] The longitudinal seam protection cover is slidably arranged on the guide rail.

[0011] In one of the optional technical solutions, the fixing card includes a connecting plate connected to the tray, an extending plate connected to one side of the connecting plate, and a fastening screw arranged on the extending plate.

[0012] In one of the optional technical solutions, the fixing card also includes a U-shaped buckle for clamping on the end of the pipe, and the U-shaped buckle is detachably connected to the fastening screw.

[0013] In one of the optional technical solutions, the sliding bracket includes a base, a telescopic adjustment member and a pivot adjustment member;

[0014] The telescopic adjustment member and the pivot adjustment member are arranged at intervals, and the telescopic adjustment member and the pivot adjustment member are respectively pivotally connected between the base and the annular seam protective cover;

[0015] Wherein, the bottom of the base has a plurality of ears which can slide relative to the inner surface of the pipe.

[0016] In one of the optional technical solutions, the end of the ear is a curved surface.

[0017] In one of the optional technical solutions, the top of the base has a base connector, and the bottom plate of the annular seam protective cover is connected with a protective cover connector;

[0018] The telescopic adjustment member and the pivot adjustment member are respectively pivotally connected between the base connection member and the shield connection member;

[0019] Wherein, the shield connecting piece can be kept perpendicular to the base connecting piece.

[0020] In one of the optional technical solutions, the telescopic adjustment member includes at least two sliding members that are slidably connected, and a clamping ring capable of locking the two sliding members is detachably arranged between any two adjacent sliding members.

[0021] In one of the optional technical solutions, the pivot adjustment member includes a plurality of pivot plates connected in sequence, and any two adjacent pivot plates can be pivotally connected.

[0022] The technical solution of the present invention also provides a pipe welding method for welding pipes using the weld protection device described in any of the above technical solutions, including a pipe longitudinal seam welding method and a pipe circumferential seam welding method;

[0023] The pipe longitudinal seam welding method comprises the following steps:

[0024] S101: Installing the longitudinal seam protection mechanism in the pipe fitting;

[0025] S102: connecting the longitudinal seam protection cover to the welding gun via a traction rope, wherein the traction rope passes through the longitudinal seam of the pipe;

[0026] S103: while using the welding gun to weld the longitudinal seam forward along the axial direction, dragging the longitudinal seam protection cover to move synchronously;

[0027] The pipe fitting girth welding method comprises the following steps:

[0028] S201: installing the annular seam protection mechanism in the pipe fitting;

[0029] S202: rotating the pipe, the sliding bracket remains relatively fixed in the pipe, and the annular seam protection cover remains at a preset height;

[0030] S203: When the welding gun is used to weld the annular seam along the circumferential direction, the welding gun is kept between the upper and lower boundaries of the annular seam protection cover.

[0031] The above technical solution has the following beneficial effects:

[0032] The weld protection device and pipe welding method provided by the present invention have the following advantages: when performing longitudinal seam welding, a welding operator welds the longitudinal seam on the outside of the pipe and uses a traction rope to support the longitudinal seam protection cover for synchronous movement, thereby ensuring that the longitudinal seam protection cover performs argon gas protection on the back side of the longitudinal seam; when performing circumferential seam welding, the pipe is driven to rotate, while the sliding bracket remains relatively fixed in the pipe, so that the circumferential seam protection cover is maintained at a preset height, and a welding operator maintains the welding gun between the upper and lower boundaries of the circumferential seam protection cover on the outside of the pipe, thereby ensuring that the circumferential seam protection cover performs argon gas protection on the back side of the circumferential seam.

[0033] Therefore, the weld protection device and pipe welding method provided by the present invention only require one welding operator, which saves labor, improves welding efficiency, and is also beneficial to improving welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0035] Figure 1 It is a schematic diagram of the longitudinal seam of the pipe fitting;

[0036] Figure 2 is a schematic diagram of the annular seam of a pipe fitting;

[0037] Figure 3 A schematic diagram of a longitudinal seam protection mechanism provided by an embodiment of the present invention installed in a pipe;

[0038] Figure 4It is a schematic diagram of the connection between the U-shaped buckle and the end of the pipe fitting;

[0039] Figure 5 A top view of a longitudinal seam protection mechanism provided by an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the longitudinal seam protection cover and the fixing bracket assembled together along the axial direction of the pipe fitting;

[0041] Figure 7 A schematic diagram of an annular seam protection mechanism provided by an embodiment of the present invention installed in a pipe;

[0042] Figure 8 This is an enlarged view of the lug;

[0043] Fig. 9 It is a schematic diagram of the structure of the clamping ring;

[0044] Fig.10 It is a cross-sectional view of the pivot plate at the connecting hole at the end. DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0046] like Figure 1-3 , Figure 5 and Figure 7 As shown, a weld protection device is provided in one embodiment of the present invention, wherein the weld protection device includes a longitudinal seam protection mechanism 2 for providing protection for the longitudinal seam 11 of the pipe 1 along the axial direction; and / or the weld protection device includes an annular seam protection mechanism 3 for providing protection for the annular seam 12 of the pipe 1 along the circumferential direction.

[0047] The longitudinal seam protection mechanism 2 comprises a fixing bracket 21 for being fixedly installed in the pipe 1 and a longitudinal seam protection cover 22 which is slidably arranged on the fixing bracket 21 and can slide along the axial direction of the pipe 1 .

[0048] The annular gap protection mechanism 3 comprises a sliding bracket 31 which is used to be arranged in the pipe 1 and can slide relative to the pipe 1 along the circumferential direction, and an annular gap protection cover 32 installed on the sliding bracket 31 .

[0049] The weld protection device provided by the present invention includes a longitudinal seam protection mechanism 2 and / or a circumferential seam protection mechanism 3. The circumferential seam protection mechanism 3 and the longitudinal seam protection mechanism 2 are two sets of independent tools. The longitudinal seam protection mechanism 2 is used to provide protection for the longitudinal seam 11 of the pipe 1 during welding. The circumferential seam protection mechanism 3 is used to provide protection for the circumferential seam 12 of the pipe 1 during welding.

[0050] The longitudinal seam protection mechanism 2 includes a fixing bracket 21 and a longitudinal seam protection cover 22. The fixing bracket 21 is used to be fixedly installed in the center hole of the pipe 1, and the two ends of the fixing bracket 21 are fixedly connected to the two ends of the pipe 1. The longitudinal seam protection cover 22 is arranged on the fixing bracket 21, and the longitudinal seam protection cover 22 can slide on the fixing bracket 21, so that the longitudinal seam protection cover 22 can slide along the axial direction of the pipe 1. The longitudinal seam protection cover 22 is located below or on the back side of the longitudinal seam 11.

[0051] When welding the longitudinal seam 11 of the pipe fitting 1, the pipe fitting 1 is placed horizontally on the supporting device with the longitudinal seam 11 facing upward. Install the fixed bracket 21 into the center hole of the pipe fitting 1, and place the longitudinal seam protective cover 22 on the fixed bracket 21. The longitudinal seam protective cover 22 is located below or on the back side of the longitudinal seam 11, and the groove wall around the opening of the longitudinal seam protective cover 22 is close to the inner surface of the pipe fitting 1. A traction rope (wire rope) is pre-connected to the longitudinal seam protective cover 22, and the traction rope passes outward through the longitudinal seam 11 of the pipe fitting 1, and the traction rope is connected to the welding gun. When the welding operator uses the welding gun to weld the longitudinal seam 11, he only needs to hold the welding gun and move it forward axially to weld, and at the same time, the longitudinal seam protective cover 22 will be dragged to move synchronously below the longitudinal seam 11, ensuring that the longitudinal seam protective cover 22 is protected by argon gas on the back side of the longitudinal seam 11.

[0052] The annular seam protection mechanism 3 includes a sliding bracket 31 and an annular seam protection cover 32. The sliding bracket 31 is used to be arranged in the pipe 1, and the sliding bracket 31 can slide along the circumferential direction relative to the pipe 1. When the pipe 1 is driven to rotate, the sliding bracket 31 is similar to a tumbler in the pipe 1, and its position relative to the ground remains relatively fixed. The annular seam protection cover 32 is connected to the sliding bracket 31, so when the pipe 1 rotates, the position of the annular seam protection cover 32 and the ground also remains relatively fixed.

[0053] When welding the annular seam 12 of the pipe 1, the pipe 1 is placed horizontally on the support device, and the pipe 1 can be driven to rotate by the driving mechanism on the support device. The annular seam protection mechanism 3 is placed in the central hole of the pipe 1, and the annular seam protection cover 32 is located on the inner side or back side of the annular seam 12, and the groove wall around the opening of the annular seam protection cover 32 is close to the inner surface of the pipe 1. When the pipe 1 rotates, the annular seam protection cover 32 is maintained at a preset height. When the welding operator uses a welding gun to weld the annular seam 12, he only needs to hold the welding gun so that it is kept between the upper and lower boundaries of the annular seam protection cover 32, ensuring that the annular seam protection cover 32 is protected by argon gas on the back side of the annular seam 12.

[0054] Therefore, the weld protection device provided by the present invention only requires one welding operator, and no personnel need to be arranged to move or hold the protection cover on the pipe 1, which saves labor, reduces labor intensity, and improves welding efficiency. When welding the longitudinal seam, the longitudinal seam protection cover 22 can move synchronously with the welding gun, and when welding the circumferential seam, the circumferential seam protection cover 32 can remain relatively fixed with the welding gun, thereby improving welding quality.

[0055] In one of the embodiments, the ends of the groove walls around the openings of the longitudinal seam protection cover 22 and the annular seam protection cover 32 are curved ends, which are convenient for fitting with the inner surface of the pipe 1 .

[0056] In one embodiment, if Figure 3 and Figure 5-6 As shown, the fixing bracket 21 includes two fixing clamps 211 for clamping with the end of the pipe 1, a tray 212 connected between the two fixing clamps 211, and a guide rail 213 installed on the tray 212. The longitudinal seam protection cover 22 is slidably arranged on the guide rail 213.

[0057] In this embodiment, the fixing bracket 21 includes two fixing cards 211 , a tray 212 and a guide rail 213 .

[0058] The two fixing clips 211 are used to connect to the two ends of the pipe fitting 1, and the tray 212 is connected between the two fixing clips 211. The tray 212 and the fixing clip 211 can be connected by bolts. A plurality of bolt connection holes can be provided at intervals on the fixing clip 211, and the bolt is connected in one of the bolt connection holes, so that the relative position of the tray 212 and the fixing clip 211 can be adjusted. The guide rail 213 is provided on the top surface of the tray 212, and the guide rail 213 extends from the fixing clip 211 at one end to the fixing clip 211 at the other end. The longitudinal seam protection cover 22 is on the guide rail 213, and it can slide on the guide rail 213. The longitudinal seam protection cover 22 can be pulled to slide on the guide rail 213 by a traction rope.

[0059] If necessary, two or more guide rails 213 may be arranged on the tray 212 at intervals along the width direction.

[0060] In one embodiment, if Figure 3 and Figure 6 As shown, the fixing card 211 includes a connecting plate 2111 connected to the tray 212 , an extending plate 2112 connected to one side of the connecting plate 2111 , and a fastening screw 2113 disposed on the extending plate 2112 .

[0061] In this embodiment, the fixing card 211 includes a connecting plate 2111, an extension plate 2112 and a fastening screw 2113. One end of the connecting plate 2111 is connected to the tray 212, and the other end thereof extends outward or above the pipe fitting 1. The extension plate 2112 is located outside the pipe fitting 1, and the extension plate 2112 extends toward one side of the connecting plate 2111. The fastening screw 2113 passes through the internal threaded hole of the extension plate 2112, and the fastening screw 2113 can be rotated to press against the pipe wall of the pipe fitting 1, thereby fixing the fixing card 211 to the end of the pipe fitting 1.

[0062] In one embodiment, if Figure 4 As shown, the fixing card 211 also includes a U-shaped buckle 2114 for clamping on the end of the pipe 1, and the U-shaped buckle 2114 is detachably connected to the fastening screw 2113.

[0063] In this embodiment, the fixing card 211 also includes a U-shaped buckle 2114, and the U-shaped buckle 2114 includes two buckle plates, and the distance between the two buckle plates is slightly greater than the thickness of the tube wall of the pipe fitting 1. One of the buckle plates of the U-shaped buckle 2114 has a connection hole for the fastening screw 2113 to pass through, and the U-shaped buckle 2114 is detachably connected to the fastening screw 2113. During installation, one of the mouth plates of the U-shaped buckle 2114 is located on the inner side of the tube wall of the pipe fitting 1, and one of the buckle plates connected to the fastening screw 2113 is located on the outer side of the tube wall of the pipe fitting 1. The U-shaped buckle 2114 is buckled on the end of the tube wall of the pipe fitting 1, which can limit the axial movement of the fixing card 211, which is conducive to improving the installation stability.

[0064] In one embodiment, if Figure 7 As shown, the sliding bracket 31 includes a base 311 , a telescopic adjustment member 312 and a pivot adjustment member 313 .

[0065] The telescopic adjusting member 312 and the pivot adjusting member 313 are arranged at intervals, and the telescopic adjusting member 312 and the pivot adjusting member 313 are pivotally connected between the base 311 and the annular seam protective cover 32 , respectively.

[0066] The bottom of the base 311 has a plurality of ears 3111 that can slide relative to the inner surface of the pipe 1 .

[0067] In this embodiment, the sliding bracket 31 includes a base 311, a telescopic adjustment member 312 and a pivot adjustment member 313. The bottom of the base 311 has a plurality of ears 3111, and the ears 3111 can slide relative to the inner surface of the pipe 1.

[0068] Generally, a support ear 3111 is installed at each of the four corners of the base 311 to stabilize the base 311. The support ear 3111 extends obliquely below the base 311, and the distance between the upper ends of any two adjacent support ears 3111 is small, and the distance between the lower ends is large, which can improve the stability of the support of the base 311.

[0069] The telescopic adjustment member 312 is located at one side of the pivot adjustment member 313, one end of the telescopic adjustment member 312 is pivotally connected to the base 311 through a pin, the other end of the telescopic adjustment member 312 is pivotally connected to the annular gap protection cover 32 through a pin, and both the base 311 and the annular gap protection cover 32 can be rotated and adjusted relative to the telescopic adjustment member 312. One end of the pivot adjustment member 313 is pivotally connected to the base 311 through a pin, the other end of the pivot adjustment member 313 is pivotally connected to the annular gap protection cover 32 through a pin, and both the base 311 and the annular gap protection cover 32 can be rotated and adjusted relative to the pivot adjustment member 313.

[0070] Therefore, the annular gap protection cover 32, the base 311, the telescopic adjustment member 312 and the pivot adjustment member 313 form a four-bar linkage.

[0071] The telescopic adjustment member 312 is a component capable of telescopic adjustment. The telescopic adjustment member 312 plays a role in supporting the annular gap protection cover 32 and can be telescopically adjusted to adjust the positional relationship between the base 311 and the annular gap protection cover 32.

[0072] The pivot adjustment member 313 is a component capable of rotational adjustment. The pivot adjustment member 313 plays a stabilizing auxiliary role, and together with the telescopic adjustment member 312 , maintains the angle of the annular seam protective cover 32 .

[0073] When welding the annular seam 12 of the pipe fitting 1, the base 311 is at the bottom of the center hole of the pipe fitting 1 to play a supporting role. The lug 3111 is on the inner surface of the pipe fitting 1. When the pipe fitting 1 rotates, the lug 3111 slides relative to the pipe fitting 1, and the lug 3111 makes the base 311 stay at the bottom of the center hole of the pipe fitting 1. The telescopic adjustment member 312 and the pivot adjustment member 313 adjust the annular seam protection cover 32 to the right position, so that the annular seam protection cover 32 is on the back side of the annular seam 12 and close to the inner surface of the pipe fitting 1.

[0074] In one embodiment, if Figure 8 As shown, the end of the lug 3111 is a curved surface 31111, which is conducive to the relative sliding between the lug 3111 and the pipe 1. The curved surface 31111 can be a part of a cylindrical surface or a spherical surface.

[0075] In one embodiment, if Figure 7 As shown, the top of the base 311 has a base connector 3112 , and the bottom plate of the annular seam protective cover 32 is connected to a protective cover connector 321 .

[0076] The telescopic adjustment member 312 and the pivot adjustment member 313 are pivotally connected between the base connection member 3112 and the shield connection member 321 , respectively.

[0077] The shield connector 321 can be kept vertical with the base connector 3112 .

[0078] The shield connector 321 and the base connector 3112 can be respectively a connecting pipe, a connecting rod, etc. The shield connector 321 is connected to the base 311 and extends in the vertical direction. The base connector 3112 is connected to the bottom plate of the annular seam shield 32.

[0079] By adjusting the telescopic adjusting member 312 and the pivot adjusting member 313 , it is possible to keep the shield connecting member 321 vertical to the base connecting member 3112 , so that the annular seam protective cover 32 is horizontally oriented toward the annular seam 12 .

[0080] Preferably, the telescopic adjusting member 312 and the pivot adjusting member 313 can be adjusted so that the height of the cover connecting member 321 is equal to the radius of the pipe fitting 1, so that the annular seam protection cover 32 is located in the middle position of the pipe fitting 1 and is horizontally pressed against the inner surface of the pipe fitting 1, making it convenient for the welding operator to perform welding operations on the outside of the pipe fitting 1.

[0081] In one embodiment, if Figure 7 and Fig. 9 As shown, the telescopic adjustment member 312 includes at least two sliding members 3121 that are slidably connected, and a clamping ring buckle 3122 that can lock the two sliding members 3121 is detachably arranged between any two adjacent sliding members 3121.

[0082] In this embodiment, the telescopic adjustment member 312 includes at least two sliding members 3121 and a clamping ring buckle 3122. The sliding member 3121 can be a sliding rod or a sliding tube. Any two adjacent sliding members 3121 are slidably connected. After the telescopic adjustment member 312 is telescopically adjusted to the right position, the clamping ring buckle 3122 is buckled at the connection between the two sliding members 3121 to fix the two adjacent sliding members 3121.

[0083] The clamping ring buckle 3122 is an elastic buckle, which includes a circular ring 31221 and a handle 31222. The inner ring surface of the circular ring 31221 is provided with teeth 31223, which is conducive to increasing the friction with the sliding member 3121. The handle 31222 is provided with a notch 31224 connected with the circular ring 31221. The radius of the center hole of the circular ring 31221 is less than the radius of the sliding member 3121. The clamping ring buckle 3122 is pre-assembled on the sliding member 3121. When it is necessary to clamp two sliding members 3121, the handle 31222 is tied with a binding rope to reduce the opening of the notch 31224, thereby clamping the two sliding members 3121.

[0084] In one embodiment, if Figure 7 and Fig.10As shown, the pivot adjustment member 313 includes a plurality of pivot plates 3131 connected in sequence, and any two adjacent pivot plates 3131 can be pivotally connected.

[0085] In this embodiment, the pivot adjustment member 313 includes a plurality of pivot plates 3131, and the front and rear adjacent pivot plates 3131 are pivotally connected by a pin, and the relative angle can be adjusted, and the length of the pivot adjustment member 313 can also be adjusted. As needed, the preload force between adjacent pivot plates 3131 can be adjusted, and after being adjusted in place, the adjacent pivot plates 3131 are kept in the corresponding positions.

[0086] Preferably, the pivot plate 3131 is a U-shaped plate, and the front and rear ends of the side plate thereof are respectively provided with connection holes 31311. The pin passes through the connection holes 31311 to connect the front and rear adjacent pivot plates 3131 together.

[0087] An embodiment of the present invention provides a pipe welding method for welding a pipe 1 using the weld protection device described in any of the aforementioned embodiments, including a pipe longitudinal seam welding method and a pipe circumferential seam welding method.

[0088] The pipe longitudinal seam welding method includes the following steps:

[0089] S101: Install the longitudinal seam protection mechanism 2 in the pipe fitting 1;

[0090] S102: Connect the longitudinal seam protection cover 22 to the welding gun via a traction rope, and the traction rope passes through the longitudinal seam 11 of the pipe 1;

[0091] S103: When using a welding gun to weld the longitudinal seam 11 forward along the axial direction, the longitudinal seam protection cover 22 is dragged to move synchronously.

[0092] The pipe girth welding method comprises the following steps:

[0093] S201: Install the annular seam protection mechanism 3 in the pipe fitting 1;

[0094] S202: rotating the pipe 1, the sliding bracket 31 remains relatively fixed in the pipe 1, and the annular seam protection cover 32 remains at a preset height;

[0095] S203 : When the welding gun is used to weld the annular seam 12 along the circumferential direction, the welding gun is kept between the upper and lower boundaries of the annular seam protection cover 32 .

[0096] When welding the longitudinal seam 11 of the pipe fitting 1, the pipe fitting 1 is placed horizontally on the supporting device with the longitudinal seam 11 facing upward. Install the fixed bracket 21 into the center hole of the pipe fitting 1, and place the longitudinal seam protective cover 22 on the fixed bracket 21. The longitudinal seam protective cover 22 is located below or on the back side of the longitudinal seam 11, and the groove wall around the opening of the longitudinal seam protective cover 22 is close to the inner surface of the pipe fitting 1. A traction rope (wire rope) is pre-connected to the longitudinal seam protective cover 22, and the traction rope passes outward through the longitudinal seam 11 of the pipe fitting 1, and the traction rope is connected to the welding gun. When the welding operator uses the welding gun to weld the longitudinal seam 11, he only needs to hold the welding gun and move it forward axially to weld, and at the same time, the longitudinal seam protective cover 22 will be dragged to move synchronously below the longitudinal seam 11, ensuring that the longitudinal seam protective cover 22 is protected by argon gas on the back side of the longitudinal seam 11.

[0097] When welding the annular seam 12 of the pipe 1, the pipe 1 is placed horizontally on the support device, and the pipe 1 can be driven to rotate by the driving mechanism on the support device. The annular seam protection mechanism 3 is placed in the central hole of the pipe 1, and the annular seam protection cover 32 is located on the inner side or back side of the annular seam 12, and the groove wall around the opening of the annular seam protection cover 32 is close to the inner surface of the pipe 1. When the pipe 1 rotates, the annular seam protection cover 32 is maintained at a preset height. When the welding operator uses a welding gun to weld the annular seam 12, he only needs to hold the welding gun so that it is kept between the upper and lower boundaries of the annular seam protection cover 32, ensuring that the annular seam protection cover 32 is protected by argon gas on the back side of the annular seam 12.

[0098] Therefore, the pipe welding method provided by the present invention only requires one welding operator, and no personnel need to be arranged to move or hold the protective cover on the pipe 1, which saves labor, reduces labor intensity, and improves welding efficiency. When welding the longitudinal seam, the longitudinal seam protective cover 22 can move synchronously with the welding gun, and when welding the circumferential seam, the circumferential seam protective cover 32 can remain relatively fixed with the welding gun, thereby improving welding quality.

[0099] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0100] The above description is only the principle and preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several other modifications can be made based on the principle of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A weld protection device, characterized in that: The weld protection device includes an annular seam protection mechanism for providing protection for the annular seam of the pipe along the circumferential direction; The annular gap protection mechanism comprises a sliding bracket configured in the pipe and capable of sliding along the circumferential direction relative to the pipe, and an annular gap protection cover installed on the sliding bracket; The sliding bracket comprises a base, a telescopic adjustment member and a pivot adjustment member; the telescopic adjustment member and the pivot adjustment member are arranged at intervals, and the telescopic adjustment member and the pivot adjustment member are respectively pivotally connected between the base and the annular seam protective cover; wherein the bottom of the base has a plurality of ears that can slide relative to the inner surface of the pipe; The top of the base is provided with a base connecting piece, and the bottom plate of the annular seam protective cover is connected with a shield connecting piece; the telescopic adjusting piece and the pivot adjusting piece are respectively pivotally connected between the base connecting piece and the shield connecting piece; Among them, by adjusting the telescopic adjusting member and the pivot adjusting member, the height of the cover connecting member is equal to the radius of the pipe fitting, so that the annular seam protection cover is in the middle position of the pipe fitting, the cover connecting member and the base connecting member are kept vertical, and the annular seam protection cover is horizontally facing the annular seam and horizontally outwardly close to the inner surface of the pipe fitting.

2. The weld protection device according to claim 1, characterized in that: The end of the ear is a curved surface.

3. The weld protection device according to claim 1, characterized in that: The telescopic adjustment member comprises at least two sliding members that are slidably connected, and a clamping ring buckle capable of locking the two sliding members is detachably arranged between any two adjacent sliding members.

4. The weld protection device according to claim 1, characterized in that: The pivot adjustment member comprises a plurality of pivot plates connected in sequence, and any two adjacent pivot plates can be pivotally connected.

5. A pipe welding method using the weld protection device according to any one of claims 1 to 4 to weld the pipe, characterized in that: Including pipe girth welding method; The pipe girth welding method comprises the following steps: S201: installing the annular seam protection mechanism in the pipe fitting; S202: rotating the pipe, the sliding bracket remains relatively fixed in the pipe, and the annular seam protection cover remains at a preset height; S203: When using a welding gun to weld the annular seam along the circumferential direction, the welding gun is kept between the upper and lower boundaries of the annular seam protection cover.

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