CN111230270B - Pipe test piece 2G circumferential weld argon arc welds inside shielding gas device - Google Patents
Pipe test piece 2G circumferential weld argon arc welds inside shielding gas device Download PDFInfo
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- CN111230270B CN111230270B CN202010033051.XA CN202010033051A CN111230270B CN 111230270 B CN111230270 B CN 111230270B CN 202010033051 A CN202010033051 A CN 202010033051A CN 111230270 B CN111230270 B CN 111230270B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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Abstract
The invention discloses an internal shielding gas device for 2G circular weld argon arc welding of a pipe test piece, which is arranged in the pipe test piece and opposite to the 2G circular weld, and comprises: a drainage tube, the gas tube, blast pipe and shutoff piece, the bottom and the top of drainage tube are equipped with down shrouding and last shrouding respectively, still be equipped with a plurality of first air vents that are close to the setting of last shrouding on the drainage tube, be equipped with respectively on the middle section position of drainage tube with first branch pipe and the second branch pipe of the inside intercommunication of drainage tube, the one end of gas tube pass behind the 2G girth joint with first branch pipe butt, the one end of blast pipe passes behind the 2G girth joint at second branch pipe relevant position, nevertheless not with second branch pipe butt, the shutoff piece removes and sets up in the branch pipe that the blast pipe corresponds. The argon arc welding internal shielding gas device can thoroughly exhaust the air in the pipe fitting to be welded, effectively improve the welding bead back protection effect and improve the welding quality of the inner side and the outer side of the 2G circular welding line and the welding line end.
Description
Technical Field
The invention relates to the technical field of welding auxiliary equipment, in particular to an internal shielding gas device for 2G circumferential weld argon arc welding of a pipe test piece.
Background
For argon arc welding construction of corrosion-resistant alloy materials, back shielding gas is required to be applied to protect root welding seams so as to ensure the performance of a welding joint. In general, when a tube test piece is welded, a sealing adhesive tape is used for sealing two tube ends and a welding seam, an inflation tube is used for inflating from the tube ends, a proper position (a welding seam gap or a tube end) is selected for exhausting, after air in the tube test piece is fully exhausted, the air is exhausted from the welding seam gap while being inflated, and meanwhile, welding is carried out at the exhaust position, so that the effect of protecting a back root welding bead is achieved. In actual field construction, there are often cases where the gas cannot be inflated from the pipe end, such as a welded junction where a submarine pipeline is connected to a submarine production facility, the submarine facility is complicated in structure, and in the welding work of the connection welded junction (2G), the valve on the side of the submarine facility cannot be opened and the gas cannot be inflated from that side, and the other side is a finished submarine pipeline which can be regarded as an infinite length and cannot be inflated. Under the condition, the gap between the welding seams is inflated and exhausted, a certain back protection effect can be achieved, the protection is insufficient, the quality of a root welding bead is difficult to guarantee, particularly, in the final welding stage of the circumferential welding seam, the inflation tube is interfered with a welding gun and a welding wire, the inflation protection cannot be performed when a longer section of final welding seam is welded, and the qualified welding seam cannot be basically obtained in the final stage under the conditions that the air in the tube is not sufficiently evacuated and the argon gas only cannot flow out.
Disclosure of Invention
The present invention is directed to solving, to some extent, one of the above-mentioned problems in the prior art. In view of the above, the invention provides the internal shielding gas device for the 2G girth weld argon arc welding of the pipe test piece, which can thoroughly exhaust the air in the pipe to be welded, effectively improve the back protection effect of the weld bead, and improve the welding quality of the inner side and the outer side of the 2G girth weld and the weld at the end of the weld.
The invention provides a tube test piece 2G circumferential weld argon arc welding internal shielding gas device which is arranged in a tube test piece and is opposite to the 2G circumferential weld, and the device comprises: a drainage tube, gas tube, blast pipe and shutoff piece, the bottom and the top of drainage tube are equipped with down shrouding and last shrouding respectively, still be equipped with a plurality ofly on the drainage tube and be close to go up the first air vent that the shrouding set up, be equipped with respectively on the middle section position of drainage tube with first branch pipe and the second branch pipe of the inside intercommunication of drainage tube, the one end of gas tube pass behind the 2G girth joint with first branch pipe butt, the one end of blast pipe passes the 2G girth joint, sets up in the position department that corresponds with the second branch pipe, nevertheless not with second branch pipe butt, the shutoff piece removes and sets up in the branch pipe that the blast pipe corresponds.
According to one embodiment of the invention, an upper ring plate is sleeved on the drainage cylinder, the upper ring plate is close to the first vent hole and is positioned below the first vent hole, a plurality of second vent holes are formed in the upper ring plate, and the diameter of the upper ring plate is the same as that of the upper sealing plate and that of the lower sealing plate.
According to one embodiment of the invention, the outer diameter of the gas-filled tube is smaller than the weld gap of the 2G girth weld and the inner diameter of the gas-filled tube is slightly larger than the inner diameter of the first branch tube.
According to one embodiment of the invention, the outer diameter of the exhaust pipe is smaller than the weld gap of the 2G girth weld, and the inner diameter of the exhaust pipe is slightly larger than the inner diameter of the second branch pipe.
According to one embodiment of the invention, the first branch pipe and the second branch pipe are consistent in structure, and the end surfaces of the first branch pipe and the second branch pipe, which are positioned outside the drainage cylinder, are provided with bell-mouth joints.
According to one embodiment of the present invention, the blocking member is made of spherical water-soluble material.
According to one embodiment of the invention, the diameter of the block piece is the same as the inner diameter of the first branch tube or the second branch tube.
According to one embodiment of the invention, the drainage tube, the upper sealing plate, the lower sealing plate and the upper annular plate are all made of water-soluble materials.
According to one embodiment of the invention, the first branch pipe and the second branch pipe are symmetrically arranged on two sides of the drainage cylinder.
The invention relates to a 2G circular weld argon arc welding internal shielding gas device for a pipe test piece, which is arranged in a pipe fitting to be welded, a gas filling pipe is inserted into a first branch pipe, an exhaust pipe is inserted into a position corresponding to a second branch pipe but not abutted against the second branch pipe, a plugging piece is introduced into the second branch pipe and plugs the second branch pipe, the weld gap in other areas of the circular weld is sealed by an adhesive tape, then shielding gas argon is filled into a drainage cylinder by the gas filling pipe by utilizing the characteristic that the argon density is greater than that of air, the air in the cylinder is emptied from bottom to top in the drainage cylinder, the gas flow mixed with the argon flows to an annular space between the drainage cylinder and the pipe fitting to be welded through a first vent hole in the upper part of the drainage cylinder and a second vent hole in an upper ring plate, the gas flow flows downwards and drives the gas flow in the upper part of the annular space to flow downwards and is exhausted through the exhaust pipe, wherein part of the argon in the gas flow sinks to the bottom of the annular space, the air at the bottom is discharged upwards, and finally discharged through an exhaust pipe, so that the air at the inner side of the circumferential weld to be welded is completely emptied, the inner side of the 2G circumferential weld is in a high-quality shielding gas state, the welding of the ending circumferential weld is completed under the common protection of the front shielding gas sprayed by the argon arc welding gun and the shielding gas inside the pipe test piece, and the welding quality of the inner side and the outer side of the 2G circumferential weld and the welding quality of the ending welding of the welding seam are improved; furthermore, a drainage cylinder, an upper sealing plate, a lower sealing plate, an upper ring plate and a plugging piece are all made of water-soluble materials, and after welding is completed, the inside of a pipe test piece is flushed with water and dissolved, so that the use and the operation are convenient.
Drawings
FIG. 1 is a half sectional view showing the use state of an argon arc welding internal shielding gas device for a 2G circumferential weld of a pipe test piece according to the invention.
FIG. 2 is a perspective view of an internal shielding gas device for argon arc welding of a 2G circumferential weld of a pipe test piece according to the invention.
FIG. 3 is a schematic diagram of the fourth operation in the use steps of the argon arc welding internal shielding gas device for the 2G circumferential weld of the pipe test piece according to the invention.
FIG. 4 is a schematic diagram of the fifth operation in the use steps of the argon arc welding internal shielding gas device for the 2G circumferential weld of the pipe test piece according to the invention.
FIG. 5 is a schematic diagram of the operation of the sixth step in the use steps of the argon arc welding internal shielding gas device for the 2G circumferential weld of the pipe test piece according to the invention.
FIG. 6 is a schematic diagram of a seventh operation in the use steps of the argon arc welding internal shielding gas device for the 2G circumferential weld of the pipe test piece according to the invention.
Reference numerals: 1-a drainage tube; 2-an inflation tube; 3-an exhaust pipe; 4-plugging piece; 10-2G girth welds; 11-lower closing plate; 12-an upper closing plate; 13-upper ring plate; 14-a first vent; 15-a first branch; 16-a second branch; 17-bell mouth joint; 20-lower tube test piece; 30-upper tube test piece; 131-second venting hole.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 and 2, an inner shielding gas device for 2G circular weld argon arc welding of a pipe test piece is arranged inside the pipe test piece and opposite to the 2G circular weld 10, and comprises: a drainage tube 1, gas tube 2, blast pipe 3 and shutoff piece 4, the bottom and the top of a drainage tube 1 are equipped with down shrouding 11 and last shrouding 12 respectively, still be equipped with a plurality of first air vents 14 that are close to the setting of last shrouding 12 on the drainage tube 11, be equipped with respectively on the middle section position of a drainage tube 1 with the inside first branch pipe 15 and the second branch pipe 16 that communicate of a drainage tube 1, the one end of gas tube 2 passes behind 2G girth joint 10 with 15 butts of first branch pipe, the one end of blast pipe 3 passes behind 2G girth joint 10, the setting is in the position that corresponds with second branch pipe 16, but not the butt, shutoff piece 4 removes and sets up in the branch pipe that blast pipe 3 corresponds.
The invention relates to an internal shielding gas device for argon arc welding of a circumferential weld of a pipe test piece 2G, which is arranged in a pipe fitting to be welded, a gas filling pipe 2 is inserted into a first branch pipe 15, a gas exhaust pipe 3 is inserted into a position corresponding to a second branch pipe 16 but not abutted against the second branch pipe 16, a blocking piece 4 is introduced into the second branch pipe 16 and blocks the second branch pipe 16, the weld gaps of other regions of the circumferential weld are sealed by adhesive tapes, then the argon gas is flushed into a drainage tube 1 from the gas filling pipe 2 by utilizing the characteristic that the argon gas density is higher than that of air, the air in the tube body is evacuated from bottom to top in the drainage tube 1, the air flow mixed with the argon gas flows to an annular space between the drainage tube 1 and the pipe fitting to be welded through a first vent hole 14 at the upper part of the drainage tube 1 and a second vent hole 131 on an upper ring plate 13, the air flow downwards and drives the gas at the upper part of the annular space to flow downwards and be exhausted through the gas exhaust pipe 3, part of argon in the gas flow sinks to the bottom of the annular space, the air at the bottom is discharged upwards, and finally the air is discharged through the exhaust pipe 3, so that the air at the inner side of the circumferential weld to be welded is completely emptied, the inner side of the 2G circumferential weld 10 is in a high-quality shielding gas state, the welding of the ending circumferential weld is completed under the common protection of front shielding gas sprayed by an argon arc welding gun and the shielding gas inside the pipe test piece, and the welding quality of the inner side and the outer side of the 2G circumferential weld 10 and the welding quality of the ending of the welding seam is improved; further, drainage tube 1, last shrouding 12, shrouding 11 down, upper ring plate 13 and shutoff piece 4 are the water-soluble material and make, and after the welding was accomplished, the inside bath of pipe test piece dissolve can, use convenient operation.
As shown in fig. 1 and 2, an upper ring plate 13 is sleeved on the drainage tube 1, the upper ring plate 13 is close to the first vent hole 14 and is located below the first vent hole 14, a plurality of second vent holes 131 are formed in the upper ring plate 13, wherein the diameter of the upper ring plate 14 is the same as that of the upper sealing plate 12 and that of the lower sealing plate 11, the upper sealing plate 12 and the lower sealing plate 11 are water-soluble material plates with sealing performance, so that the drainage tube 1 and the tube test piece form an air dam, and the upper sealing plate 12 and the lower sealing plate 11 act together to centralize and fix the drainage tube 1 inside the tube test piece to be welded, and the second vent holes 131 and the first vent holes 14 in the upper ring plate 13 play a role in gas drainage.
As shown in fig. 1 and 2, the outer diameter of the gas-filled tube 2 is smaller than the weld gap of the 2G girth weld 10, and the inner diameter of the gas-filled tube 2 is slightly larger than the inner diameter of the first branch tube 15; the external diameter of blast pipe 3 is less than 2G girth weld 10's weld seam clearance, the internal diameter of blast pipe 3 slightly is greater than the internal diameter of second branch pipe 16, wherein first branch pipe 15 is unanimous with second branch pipe 16 structure, the symmetry is established in the both sides of draft tube 1, first branch pipe 15 and second branch pipe 16 all are equipped with bell mouth joint 17 on being located the terminal surface in the draft tube 1 outside, it needs to understand, bell mouth joint 17 makes things convenient for gas tube 2 and first branch pipe 15 or 16 butts of second branch pipe, make things convenient for blocking piece 4 to get into in second branch pipe 16 or first branch pipe 15 and fix through blast pipe 3 simultaneously.
As shown in fig. 1 and 2, the plugging member 4 is made of spherical water-soluble material, the diameter of the plugging member 4 is the same as the inner diameter of the first branch pipe 15 or the second branch pipe 16, it should be understood that the spherical plugging member 4 is fixed in the first branch pipe 15 or the second branch pipe 16 by friction force to play a role in plugging the pipeline, and after welding is completed, the inside of the pipe test piece is flushed by water to dissolve the plugging member 4, so that the inside of the pipe test piece is not blocked.
As shown in fig. 1 and 2, the drainage tube 1, the upper sealing plate 12, the lower sealing plate 11 and the upper annular plate 13 are made of water-soluble materials, and after welding is completed, the inside of the pipe test piece is flushed with water to dissolve the plugging piece, so that the inside of the pipe test piece cannot be blocked.
As shown in fig. 1 to 6, the use steps of the internal shielding gas device for the pipe test piece 2G girth weld argon arc welding of the invention are as follows:
firstly, polishing, derusting and other treatments are carried out on a 2G circumferential weld 10 groove, so that the periphery of the groove is bright within a range of 25mm and presents metallic luster;
secondly, the lower part of the drainage cylinder 1 is sleeved into a lower pipe test piece 20, so that the gaps between the grooves of the first branch pipe 15 and the second branch pipe 16 and the 2G circumferential weld 10 are parallel and level, a rigid iron wire with a diameter slightly smaller than that of the first branch pipe 15 and the second branch pipe 16 penetrates through the first branch pipe 15 and the second branch pipe 16 and is lapped on the truncated edge of the groove of the 2G circumferential weld 10, a thin sheet is padded between the rigid iron wire and the truncated edge of the 2G circumferential weld groove 10 to compensate the difference between the diameter of the iron wire and the inner diameters of the first branch pipe 15 and the second branch pipe 16 and the micro-deformation of the stressed iron wire, and the device can be normally used after the test piece is assembled;
thirdly, sheathing the upper pipe test piece 30 downwards from the upper part of the drainage cylinder 1 to form a test piece to be welded, drawing out the auxiliary steel wire after the test piece to be welded is assembled and fixed (the fixing method can be various, such as an external aligning device and the like), and fixing the drainage cylinder 1 in the test piece to be welded by virtue of friction force, thus completing the assembly of the test piece and the installation of the device;
fourthly, inserting the gas filling pipe 2 into the test piece to be welded from the gap of the groove of the 2G circular weld 10, butting the gas filling pipe with the first branch pipe 15, sending a plugging piece 4 into the second branch pipe 16, fixing the plugging piece 4 in the second branch pipe 16 by means of friction force, inserting the gas discharging pipe 3 into the test piece to be welded from the gap of the groove of the 2G circular weld 10, not butting the second branch pipe 16, sealing the whole groove of the 2G circular weld 10 except the gas filling pipe 2 and the gas discharging pipe 3 by using a sealing adhesive tape, filling protective gas argon into the test piece to be welded by the gas filling pipe 2, discharging the argon in the walking process of the test piece, namely the air emptying process, finally discharging the gas through the gas discharging pipe 3, detecting the oxygen content by an analyzer, completely exhausting the air in the test piece of the pipe under the condition that the emptying time is long enough, and after the oxygen content in the discharged gas is stable and meets the test requirements, the subsequent operation can be carried out;
fifthly, after emptying, selecting a proper position (the position is based on the principle of starting welding) near the gas-filled tube 2, uncovering a small section of sealing tape, simultaneously pulling off the gas-filled tube 3, sealing the welding seam at the position where the gas-filled tube 3 is pulled off by the sealing tape, starting to uncover the tape along the preset direction and weld at the position where the sealing tape is uncovered to exhaust, and leaving a section at the position corresponding to the second branch tube 16 without welding, wherein the section is slightly larger than the outer diameter of the gas-filled tube;
sixthly, after the steps are finished, stopping inflation, feeding another plugging piece 4 into the first branch pipe 15 through the inflation pipe 2, fixing the plugging piece 4 in the first branch pipe 15 by friction force, pulling out the inflation pipe 2, sealing the section of welding seam by using a sealing adhesive tape, removing the corresponding sealing adhesive tape at the second branch pipe 16, pushing the plugging piece 4 in the second branch pipe 16 into the drainage tube 1 by using a thin iron wire, inserting the inflation pipe 2 into the test piece from the section of welding seam gap, connecting the inflation pipe with the second branch pipe 16, sealing the welding seam gaps at two sides of the original inflation pipe by using the sealing adhesive tape, opening a small section of the sealing adhesive tape on the non-welded welding seam corresponding to the first branch pipe 15 to play a role of exhausting, inflating protective gas into the test piece to be welded from the inflation pipe 2, exhausting gas from the welding seam gap where the sealing adhesive tape is opened, after the sealing adhesive tape is fully exhausted, starting to open the adhesive tape and weld along a preset direction at the exhaust position, until the welding of the section of welding bead is finished, the adhesive tape on one side of the gas-filled tube 2 is uncovered to play a role of exhausting so as to prevent the welding bead forming from being influenced by the increase of the internal air pressure when the welding of the section of welding bead is finished;
and seventhly, completely removing the sealing adhesive tapes on the two sides of the inflation tube, inflating the protection gas into the inflation tube 2, exhausting the gas from the two sides of the inflation tube 2, fully emptying, removing the inflation tube 2, and immediately welding until welding is finished.
The beneficial effects in the use steps are as follows:
1. the characteristic that the density of the argon gas of the shielding gas is greater than that of the air is utilized, the air in the test piece to be welded is discharged through the drainage guide effect in the device, the evacuation is thorough, and the welding bead back protection effect can be effectively improved.
2. Through the adjustment position of aerifing, can reduce the length of the final welding bead that does not have the protection of aerifing greatly, benefit here, remove the twinkling of an eye of gas tube, carry out the final welding promptly, argon arc welder spun protective gas can form the gas hood protection to the final welding bead that only has several millimeters for the air can not get into inside welding seam and the pipe test piece, and the inside high-purity argon gas that has of pipe test piece protects, the high-quality protective gas of inside and outside both sides has guaranteed the welding quality of final welding bead.
3. Stay in the inside part of pipe test piece, including a drainage section of thick bamboo and two shutoff pieces, all adopt water-soluble material, after the welding is accomplished, the test piece is inside to be washed by water and dissolve can, can not remain solid residue.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. The utility model provides a pipe test piece 2G girth weld argon arc welds inside shielding gas device establishes inside the pipe test piece and sets up with 2G girth weld position relatively, and it includes: a drainage tube, gas tube, blast pipe and shutoff piece, its characterized in that, the bottom and the top of a drainage tube are equipped with down shrouding and last shrouding respectively, still be equipped with a plurality ofly on the drainage tube and be close to go up the first air vent that the shrouding set up, be equipped with respectively on the middle section position of a drainage tube with first branch pipe and the second branch pipe of the inside intercommunication of a drainage tube, the one end of gas tube pass behind the 2G girth joint with first branch pipe butt, the one end of blast pipe pass behind the 2G girth joint, with the position that the second branch pipe corresponds, but not the butt, the shutoff piece removes and sets up in the branch pipe that the blast pipe corresponds.
2. The tube test piece 2G circular weld argon arc welding internal shielding gas device according to claim 1, wherein an upper ring plate is sleeved on the drainage cylinder, the upper ring plate is close to and located below the first vent hole, a plurality of second vent holes are formed in the upper ring plate, and the diameter of the upper ring plate is the same as that of the upper sealing plate and that of the lower sealing plate.
3. The tube test piece 2G circular weld argon arc welding internal shielding gas device according to claim 1, wherein the outer diameter of the inflation tube is smaller than the weld gap of the 2G circular weld, and the inner diameter of the inflation tube is slightly larger than the inner diameter of the first branch tube.
4. The pipe test piece 2G circumferential weld argon arc welding internal shielding gas device according to claim 2, characterized in that the outer diameter of the exhaust pipe is smaller than the weld gap of the 2G circumferential weld, and the inner diameter of the exhaust pipe is slightly larger than the inner diameter of the second branch pipe.
5. The pipe test piece 2G circumferential weld argon arc welding internal shielding gas device according to claim 1, wherein the first branch pipe and the second branch pipe are consistent in structure, and horn mouth joints are arranged on end faces, located on the outer side of the drainage cylinder, of the first branch pipe and the second branch pipe.
6. The pipe test piece 2G circumferential weld argon arc welding internal shielding gas device according to claim 1, wherein the blocking piece is made of spherical water-soluble materials.
7. The pipe test piece 2G circumferential weld argon arc welding internal shielding gas device according to claim 6, wherein the diameter of the blocking piece is the same as the inner diameter of the first branch pipe or the second branch pipe.
8. The pipe test piece 2G circular weld argon arc welding internal shielding gas device according to claim 2, wherein the drainage cylinder, the upper sealing plate, the lower sealing plate and the upper annular plate are all made of water-soluble materials.
9. The pipe test piece 2G circumferential weld argon arc welding internal shielding gas device according to claim 1, wherein the first branch pipe and the second branch pipe are symmetrically arranged on two sides of the drainage cylinder.
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| JP3996825B2 (en) * | 2002-09-17 | 2007-10-24 | 株式会社日立製作所 | Pipe welding method |
| EP2570223A1 (en) * | 2011-09-15 | 2013-03-20 | Linde Aktiengesellschaft | Method of purging air from a structure to be welded using liquid cryogen |
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| Publication number | Publication date |
|---|---|
| CN111230270A (en) | 2020-06-05 |
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