Coiled tubing butt welding apparatus and method

Abstract

The application discloses a coiled tubing plate butt joint welding device and a welding method. The device comprises a support, a steel belt straightening wheel, a steel belt position adjusting device, a steel belt welding clamping device, a plasma welding gun, a steel belt cutting device and a steel belt clamping device which are sequentially arranged on the support from left to right. The steel belt position adjusting device is provided with an adjusting steel belt position knob and a gas pressure driving device. The adjusting steel belt position knob can adjust the position of the steel belt. The gas pressure driving device can push the compressed steel belt after being pressurized. The coiled tubing plate butt joint welding device and the welding method can not only guarantee the welding quality, but also make the heat induction area smaller, the welding thickness range wider, and the welding without beveling. The welding degree of automation is high, and the welding is more standardized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas pipe, in particular to a coiled tubing plate butt welding equipment and welding method. BACKGROUND

[0002] Coiled tubing is a special steel pipe used in oil and gas field workover, logging, drilling and other aspects. Due to a series of advantages such as high efficiency, low cost, wide operation range, and small land occupation, the coiled tubing technology has developed very quickly in recent years, and the product development prospect is very good. At present, the existing steel strip butt joint machine mainly adopts argon arc welding, and the welding thickness is limited. At the same time, the steel strip needs to be beveled. Due to the problem of welding burn loss, the thickness and width of the welded steel strip are difficult to be consistent with the original steel strip. SUMMARY

[0003] The purpose of the present application is to provide a coiled tubing plate butt welding equipment and welding method to solve the above problems existing in the prior art.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] The coiled tubing plate butt welding equipment of the present application comprises a support and a steel strip straightening wheel, a steel strip position adjusting device, a steel strip welding clamping device, a plasma welding gun, a steel strip cutting device and a steel strip clamping device arranged in order from left to right on the support. The steel strip position adjusting device is provided with an adjusting steel strip position knob and a gas pressure driving device. The adjusting steel strip position knob can adjust the position of the steel strip. The gas pressure driving device can push the steel strip after being pressurized.

[0006] Further, the adjusting steel strip position knob drives the screw to rotate through the threaded structure. The gas pressure driving device is provided with a threaded seat matched with the screw. The screw can drive the threaded seat to move, so as to pull in and move away the gas pressure driving device, and finely adjust the position of the steel strip.

[0007] Further, the steel strip straightening wheel comprises a roller fixed frame and a roller. Two rollers are respectively rotationally connected to the roller fixed frame. The roller fixed frame is fixedly connected to the support. The steel strip is located between the two rollers.

[0008] Further, the steel strip welding clamping device is made of brass. The steel strip is provided with an arc striking plate and an arc extinguishing plate at both ends. The steel strip welding clamping device can fix the end of the steel strip, the arc striking plate and the arc extinguishing plate after being pressed down.

[0009] Further, the steel belt cutting device cuts the steel belt by the hydraulic control blade descending and the two blades cutting the steel belt staggered with each other.

[0010] Further, the steel belt welding clamping device is provided with a lower backing plate arranged on the right side of the steel belt welding clamping device and below the plasma welding torch, a welding groove is arranged at the middle position of the lower backing plate, and a lower shielding gas is introduced at the lower weld bead forming position of the lower backing plate.

[0011] Further, the steel belt welding clamping device is provided with a lower backing plate arranged on the right side of the steel belt welding clamping device and below the plasma welding torch, a welding groove is arranged at the middle position of the lower backing plate, and a lower shielding gas is introduced at the lower weld bead forming position of the lower backing plate.

[0012] A continuous tubing plate butt welding method comprises the following steps:

[0013] Step one, first, a steel belt is put into a steel belt cutting device through a steel belt clamping device, the steel belt is fixed through the steel belt clamping device, the steel belt cut by the steel belt cutting device is sent to the bottom of a steel belt welding clamping device, then another steel belt is put into a steel belt position adjusting device through a steel belt straightening wheel, and is then sent to the bottom of the steel belt welding clamping device, at this time, the position of the steel belt can be adjusted through an adjusting steel belt position knob, and the steel belt is fixed through a gas pressure driving device after the position adjustment is completed;

[0014] Step two, an arc striking plate and an arc extinguishing plate are arranged at the two ends of the steel belt, the two ends of the steel belt, the arc striking plate and the arc extinguishing plate are fixed through the steel belt welding clamping device, at this time, the unstable position of starting and ending of welding can be excluded to the outside of the steel belt;

[0015] Step three, the steel belt is automatically welded by a plasma welding torch, a wire feeding device is arranged at the rear side of the plasma welding torch, wire filling welding can be carried out, and the weld has a certain height, and the welding is a single-sided welding without a groove;

[0016] Step four, the oxide is polished through an air grinder.

[0017] Further, the steel belt welding clamping device is made of brass, heat conduction can be accelerated, and a heat induction area is reduced.

[0018] Further, the steel belt welding clamping device is made of brass, heat conduction can be accelerated, and a heat induction area is reduced.

[0019] Compared with the prior art, the beneficial technical effects of the present application are as follows:

[0020] The coiled tubing plate butt welding equipment and method of the present invention can not only ensure welding quality, but also make the heat induction zone smaller and the welding thickness range wider by adopting plasma welding, and no beveling is required during welding, so the welding degree is high and the welding is more standardized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of the coiled tubing sheet butt welding equipment of the present invention.

[0023] Explanation of the accompanying symbols: 1. Steel strip straightening wheel; 2. Steel strip position adjustment device; 3. Pneumatic drive device; 4. Bracket; 5. Steel strip position adjustment knob; 6. Steel strip welding clamping device; 7. Plasma welding gun; 8. Bottom plate; 9. Steel strip cutting device; 10. Steel strip clamping device. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figure 1 As shown, a coiled tubing sheet butt welding device includes a bracket 4 and, from left to right, a steel strip straightening wheel 1, a steel strip position adjustment device 2, a steel strip welding clamping device 6, a plasma welding gun 7, a steel strip cutting device 9, and a steel strip clamping device 10. The steel strip position adjustment device 2 is provided with a steel strip position adjustment knob 5 and a pneumatic drive device 3. The steel strip position adjustment knob 5 can adjust the position of the steel strip, and the pneumatic drive device 3 can push and compress the steel strip after applying pressure.

[0026] When the coiled tubing plate butt welding equipment and welding method of this embodiment 1 is used, first, a steel strip is placed into the steel strip cutting device 9 through the steel strip clamping device 10, and the steel strip is fixed by the steel strip clamping device 10. The steel strip cut by the steel strip cutting device 9 is sent to the bottom of the steel strip welding clamping device 6. Then, another steel strip is placed into the steel strip position adjustment device 2 through the steel strip straightening wheel 1, and then sent to the bottom of the steel strip welding clamping device 6. At this time, the position of the steel strip can be adjusted by adjusting the steel strip position knob 5. The position adjustment After completion, the steel strip is pressed and fixed by the pneumatic drive device 3; then, arc-starting plates and arc-extinguishing plates are set at both ends of the steel strip, and the two steel strip ends, arc-starting plates and arc-extinguishing plates are pressure-fixed by the steel strip welding clamping device 6. At this time, the unstable positions at the beginning and end of welding can be excluded from the steel strip; the steel strip is automatically plasma-welded by the plasma welding gun 7. A wire feeding device is provided on the rear side of the plasma welding gun 7, which can be used for wire feeding and filling welding to ensure that the weld has excess height. This welding is single-sided welding without groove, and the welding operation is completed.

[0027] Wherein, after welding, the oxide skin can be polished by using an air grinder.

[0028] Specifically, the adjusting steel belt position knob 5 is advanced and retreated by the air pressure driving device 3 through a threaded structure, and the screw rod is driven to rotate after the adjusting steel belt position knob 5 is rotated, the air pressure driving device 3 is provided with a threaded seat matched with the screw rod, and the screw rod can drive the threaded seat to move, so that the air pressure driving device 3 is pulled in and away from the steel belt position, and the steel belt position is finely adjusted.

[0029] Specifically, the adjusting steel belt position knob 5 is provided with three adjusting steel belt position knobs to finely adjust the steel belt position in multiple directions.

[0030] Specifically, the steel belt straightening wheel 1 includes a roller fixed frame and rollers, two rollers are respectively rotatably connected to the roller fixed frame, the roller fixed frame is fixedly connected to the support 4, and the steel belt is located between the two rollers.

[0031] Specifically, the steel belt welding clamping device 6 is made of brass, the steel belt is provided with an arc striking plate and an arc extinguishing plate at both ends, and the steel belt welding clamping device 6 can fix the end of the steel belt, the arc striking plate and the arc extinguishing plate after being pressed down.

[0032] In this embodiment 1, the steel belt welding clamping device 6 is made of brass, which can accelerate heat conduction and reduce the heat induction area; by setting the arc striking plate and the arc extinguishing plate, the heat can be effectively absorbed to reduce the range of the heat induction area.

[0033] Specifically, the steel belt cutting device 9 is controlled by hydraulic pressure to lower the blades, and the two blades are cut by being staggered.

[0034] Specifically, it also includes a lower backing plate 8, the lower backing plate 8 is arranged on the right side of the steel belt welding clamping device 6 and below the plasma welding gun 7, a welding groove is arranged at the middle position of the lower backing plate 8, and a lower protective gas is introduced at the lower bead forming position of the lower backing plate 8.

[0035] Wherein, the lower protective gas is argon.

[0036] Specifically, it also includes a wire feeding device, the wire feeding device is arranged on the rear side of the plasma welding gun 7, the wire feeding device is used for wire filling welding, and the welding is single-sided welding without bevel.

[0037] Embodiment 2

[0038] A continuous oil pipe plate butt welding method, comprising the following steps:

[0039] Step one, first put a steel band through the steel band clamping device 10 into the steel band cutting device 9, and fix the steel band through the steel band clamping device 10, the steel band cut by the steel band cutting device 9 is sent to the bottom of the steel band welding clamping device 6, then put another steel band through the steel band straightening wheel 1 into the steel band position adjusting device 2, and then into the bottom of the steel band welding clamping device 6, at this time, the position of the steel band can be adjusted by adjusting the steel band position knob 5, and after the position adjustment is completed, the steel band is fixed by the air pressure driving device 3;

[0040] Step two, the arc guide plate and the arc extinguishing plate are arranged at both ends of the steel band, and the ends of the two steel bands, the arc guide plate and the arc extinguishing plate are fixed by the steel band welding clamping device 6, at this time, the unstable position of the beginning and end of welding can be excluded outside the steel band;

[0041] Step three, the plasma welding gun 7 is used for automatic plasma welding of the steel band, the rear side of the plasma welding gun 7 is provided with a wire feeding device, so that the wire filling welding can be carried out, and the weld has a certain height, and the welding is single-sided welding without beveling;

[0042] Step four, polishing is carried out by the air grinder to remove the oxide skin.

[0043] Specifically, the steel band welding clamping device 6 is made of brass, which can accelerate heat conduction and reduce the heat induction area.

[0044] Specifically, the lower backing plate 8 is arranged on the right side of the steel band welding clamping device 6 and below the plasma welding gun 7, a welding groove is arranged at the middle position of the lower backing plate 8, and a lower protective gas is introduced into the lower welding channel forming position of the lower backing plate 8 during welding.

[0045] In this embodiment 2, the lower protective gas is argon.

[0046] The continuous coiled tubing plate butt welding equipment and the welding method can not only ensure the welding quality, but also make the heat induction area smaller, the welding thickness range wider, and the welding without beveling, and the welding is highly automated and more standardized.

[0047] The above embodiments only describe the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements of the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope determined by the claims of the present application.

Claims

1. A coiled tubing sheet butt welding device, characterized in that: The device comprises a support and, from left to right, a steel strip straightening wheel, a steel strip position adjustment device, a steel strip welding clamping device, a plasma welding gun, a steel strip cutting device, and a steel strip clamping device, the steel strip position adjustment device being at a certain angle to the steel strip, the steel strip position adjustment device being provided with a steel strip position adjustment knob and a pneumatic drive device, the steel strip position adjustment knob being capable of adjusting the position of the steel strip, and the pneumatic drive device being capable of pushing and compressing the steel strip after applying pressure; The steel belt position adjustment knob enables the pneumatic drive device to move forward and backward through a threaded structure. Rotating the steel belt position adjustment knob can drive the screw to rotate. The pneumatic drive device is provided with a threaded seat that cooperates with the screw. The screw can drive the threaded seat to move, so that the pneumatic drive device is pulled in and out, and the position of the steel belt is fine-tuned. There are three steel belt position adjustment knobs to fine-tune the position of the steel belt in multiple directions. It also includes a lower pad, which is arranged on the right side of the steel strip welding clamping device and below the plasma welding gun, a welding groove is provided in the middle of the lower pad, and a lower shielding gas is introduced into the lower weld bead forming position of the lower pad; The steel strip welding clamping device is made of brass, and arc-starting plates and arc-extinguishing plates are provided at both ends of the steel strip. When the steel strip welding clamping device is pressed down, the steel strip end, the arc-starting plates and the arc-extinguishing plates can be fixed; It also includes a wire feeding device, which is provided at the rear side of the plasma welding gun and is used for feeding wire for filling welding, and the welding is single-sided welding without groove; The lower pad is provided on the right side of the steel strip welding clamping device and below the plasma welding gun. A welding groove is provided in the middle of the lower pad. During welding, a lower shielding gas is introduced into the weld bead forming position of the lower pad. The welding method of the coiled tubing plate butt welding equipment comprises the following steps: Step 1: First, put a steel strip into the steel strip cutting device through the steel strip clamping device, and fix the steel strip through the steel strip clamping device. The steel strip cut by the steel strip cutting device is sent to the bottom of the steel strip welding clamping device. Then, put another steel strip into the steel strip position adjustment device through the steel strip straightening wheel, and then send it to the bottom of the steel strip welding clamping device. At this time, the position of the steel strip can be adjusted by adjusting the steel strip position knob. After the position adjustment is completed, the steel strip is pressed and fixed by the pneumatic drive device; Step 2: Install arc-starting plates and arc-extinguishing plates at both ends of the steel strip, and use a steel strip welding clamping device to pressure-fix the two steel strip ends, the arc-starting plates, and the arc-extinguishing plates. This eliminates the unstable positions at the start and end of welding and places them outside the steel strip. Step 3: The plasma welding gun performs automatic plasma welding on the steel strip. A wire feeding device is provided on the rear side of the plasma welding gun, which can be used for wire feeding and filling welding to ensure that the weld has excess height. This welding is single-sided welding without groove; Step 4: Grind and remove the oxide scale using an air grinder.

2. The coiled tubing sheet butt welding equipment according to claim 1, characterized in that: The steel belt straightening wheel includes a roller fixing frame and a roller. The two rollers are rotatably connected to the roller fixing frame respectively. The roller fixing frame is fixedly connected to the bracket. The steel belt is located between the two rollers.

3. The coiled tubing sheet butt welding equipment according to claim 1, characterized in that: The steel strip cutting device is hydraulically controlled so that the blades are lowered and the two blades are staggered with each other to cut the steel strip.

4. The coiled tubing sheet butt welding equipment according to claim 1, characterized in that: The steel strip welding clamping device is made of brass, which can accelerate heat conduction and reduce the heat induction area.

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