CN106475666A - Pipeline narrow gap vertical downward TIG weld method - Google Patents
Pipeline narrow gap vertical downward TIG weld method Download PDFInfo
- Publication number
- CN106475666A CN106475666A CN201611019564.5A CN201611019564A CN106475666A CN 106475666 A CN106475666 A CN 106475666A CN 201611019564 A CN201611019564 A CN 201611019564A CN 106475666 A CN106475666 A CN 106475666A
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- China
- Prior art keywords
- welding
- point
- groove
- tubing
- narrow gap
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Classifications
-
- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- 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
-
- 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
Abstract
The invention discloses a kind of pipeline narrow gap vertical downward TIG weld method, including：Step 1：Prepare before weldering；Step 2：Welding rod and the selection of electric current；Step 3：Tack welding, the upper extreme point of the vertical line in tubing axle center is downhand welding point, and lower extreme point is overhead welding point, and described downhand welding point and overhead welding point carry out tack welding respectively；Step 4：Welding, the left side welding sequence being divided into the vertical line in tubing axle center and right-hand part welding sequence, carry out backing welding first, from downhand welding point striking, add welding wire, welding gun tungsten electrode end is all the time from opposite side natural downslide one angle, θ at a lateral groove back side at the groove back side, until breath arc；Then it is filled with welding；After filling weldering, carry out cosmetic welding, from downhand welding point striking, add welding wire, welding gun tungsten electrode end is all the time from lateral opposite side natural downslide one angle, θ of groove, until breath arc.The present invention is easy to operate, welding blind area is few, can effectively improve pipeline welding qualification rate, controls back of weld to stay and indent phenomenon.
Description
Technical field
The present invention relates to solder technology is and in particular to the welding method of pipeline narrow gap vertical downward.
Background technology
Now commonly used boiler heating in city, welding is the important component part of boiler quality, welding quality good
The length of bad direct relation boiler heating surface of tubes service life.High-temperature Superheater In A Boiler welding position be boiler welding emphasis it
One it is important to alloy material is also High Temperature High Pressure part, traditional welding method from bottom to top, visits through X-ray detection X-ray
Hindering ratio is 50%；Welding sight line blind area is many：Especially narrow gap welding position, some welding positions fist all can not be stretched, only
Can go to weld by stretching handss and holding welding gun using two or three fingers, increase sight line blind area, welding operation when putting on welding mask
More difficult；And traditional welding method, the weld seam downhand welding back side easily stays, and x-ray film is assessed as not merging；Weld seam is faced upward
The easy indent in the weldering back side, x-ray film is assessed as serious undercut, does not merge and be unqualified egative film with serious undercut, can lead to
Waste of material, inefficiency, speed of welding is slow, increased repair rate, and labour cost.
In order to ensure welding quality and duration, need above-mentioned welding method is improved.
Content of the invention
For the above-mentioned deficiency of prior art, it is an object of the invention to provide one kind is easy to operate, welding blind area is few, energy
Enough effectively improve the pipeline narrow gap vertical downward TIG weld method of pipeline welding qualification rate.
The above-mentioned purpose of the present invention to be realized by following technical solution：
The present invention provides a kind of pipeline narrow gap vertical downward TIG weld method, comprises the following steps：
Step 1：Prepare before weldering, it is right that tubing is organized two-by-two, reserved fit-up gap, and according to size of pipe and tubing finished edge chi
Very little；
Step 2：Welding wire and the selection of electric current, according to the size of tubing, welding personnel selects weldering to the proficiency level of welding
Bar and electric current；
Step 3：Tack welding, the upper extreme point of the vertical line in tubing axle center is downhand welding point, and lower extreme point is overhead welding point, described downhand welding
Point and overhead welding point carry out tack welding respectively；
Step 4：Welding, welding is divided into left side welding sequence and right-hand part welding sequence by the vertical line in tubing axle center,
The welding step of described left side welding sequence and right-hand part welding sequence is as follows：
Carry out backing welding first, from downhand welding point striking, add welding wire, welding wire remains at the side at the groove back side, weldering
Rifle tungsten electrode end is welded from welding wire groove one angle, θ of lateral opposite side natural downslide all the time, until breath arc；
Then it is filled with welding, be overlapped welding on the basis of backing welding；
Finally carry out cosmetic welding, after filling weldering, from downhand welding point striking, add welding wire, welding wire remains at groove
Side, welding gun tungsten electrode end is welded from welding wire groove one angle, θ of lateral opposite side natural downslide all the time, until breath arc.
Preferably, in described step 4, the scope of the angle, θ of natural downslide is 4 °～8 °.
Preferably, described striking and breath arc position are located at the solid point welding line 5mm of welding direction of advance.
Preferably, welding wire is added when being located at the solid point welding line end of welding direction of advance in described striking and breath arc position,
So that tack welding back of weld forming width and reinforcement uniformity, and welding wire remains at groove side.
Preferably, cease arc when fusing groove and exceeding tubing two arris 1mm, every time fusion identical so that weld seam width and
Reinforcement uniformity.
Preferably, in described step 3, the tack welding length range of downhand welding point and overhead welding point is 20mm～30mm.
Preferably, the scope that fit-up gap reserved by described tubing is 3～5mm.
Preferably, described groove adopts double V-groove, and bevel angle is in the range of 55 °～65 °.
With respect to traditional welding method from bottom to top, inventive pipeline narrow gap vertical downward TIG weld method has
Following beneficial effect：
1) present invention by making one jiao of θ of electric arc natural downslide with tungsten electrode arc thrust and remains at groove
Welding wire is added in side, is effectively controlled back of weld and stays and indent phenomenon, so that whole back of weld molding is kept with weld seam
Uniformity, width and reinforcement uniformity.
2) present invention adopts the vertical downward welding of left side welding sequence and right-hand part welding sequence, decreases narrow of pipeline
Sight line blind area during gap welding.
3) present invention reaches more than 96% through X-ray detection flaw detection qualification rate.
In sum, repair rate can be decreased using inventive pipeline narrow gap vertical downward TIG weld method, improve
Work efficiency；Save material, effectively improve pipeline welding qualification rate.
Brief description
Fig. 1 is the present invention two tubing horizontal positioned schematic diagrams to be welded.
Fig. 2 is tack welding downhand welding point of the present invention and the schematic diagram facing upward bond pad locations.
Fig. 3 is the electric arc walking path schematic diagram of left side of the present invention welding sequence and right-hand part welding sequence.
Fig. 4 is natural downslide angle schematic diagram when backing welding of the present invention and cosmetic welding welding.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes：
As Figure 1-4, inventive pipeline narrow gap vertical downward TIG weld method is as follows：
Step 1：Prepare before weldering, all tubing 1 and tubing 2 are organized right, two tubing two-by-two according to clearance requirement horizontal positioned
Between reserved fit-up gap d be 3～5mm,
Further, between tubing 1 and tubing 2, reserved fit-up gap d is 4mm,
And require processing V-shaped groove according to size of pipe and tubing and bevel angle, in the range of bevel angle is 55 °～65 °,
Further, bevel angle opens 60 °, and root face is 0.5,
Then clear up at the 20mm of in two tube grooves and pipeline both sides.
Step 2：Welding rod and the selection of electric current, the size according to tubing such as thickness of diameter, tube wall etc. and welding personnel
Proficiency level to welding, selects suitable welding rod and electric current,
Further, select tubing 1 and the tubing 2 of Φ 38*5mm (pipe diameter * tubing thickness), select a diameter of 1.6
～2 welding rod, electric current is in the range of 100～120A.
Step 3：Tack welding, the upper extreme point of the vertical line in tubing axle center is downhand welding point P1, and lower extreme point is overhead welding point P2, described
Downhand welding point P1 and overhead welding point P2 carries out tack welding respectively；Tack welding length range is 20mm～30mm,
Further, the tack welding length of described downhand welding point P1 is 20mm, and the tack welding length of overhead welding point P2 is 20mm, point
Gu postwelding weld gap d shrinks 0.5mm.
Step 4：Welding, is divided into left side welding sequence with the vertical line in tubing axle center and right-hand part welding sequence is welded
Connect, welding step is as follows：
Carry out backing welding first, before welding, welding wire extend into the tack welding side of downhand welding point P1 inside weld gap, weldering
When connecing, welding wire remains at the side at the groove back side；
Striking, from the direction of advance of downhand welding point P1 away from weld seam one end 0.5 at start striking, the solid point of heated flat solder joint P1
Welding line, is melted to during solid point welding line end interpolation welding wire so that the tack welding back of weld forming width of downhand welding point P1 and
Reinforcement uniformity, welding wire remains at the side at the groove back side；
Electric arc moving direction, makes the opposite side at a lateral groove back side from the groove back side for the electric arc with tungsten electrode arc thrust
One jiao of θ of natural downslide, described one jiao of θ of natural downslide are 6 °, until to overhead welding welding line joint position；
Breath arc, when reaching at the solid point welding line end of overhead welding point P2, adds welding wire, so that the solid point welding line of overhead welding point P2
Bead formed on back width and reinforcement uniformity, welding wire remains at the side at the groove back side, is welded to the solid point of overhead welding point P2
When at welding line fusing 0.5mm, cease arc.
Then it is filled with welding, be overlapped welding on the basis of backing welding.
Finally carry out cosmetic welding, after filling weldering, from downhand welding point P1 striking, add welding wire, welding wire remains groove one
Side, makes one jiao of θ of opposite side natural downslide of a lateral groove from groove for the electric arc, described natural downslide with tungsten electrode arc thrust
One jiao of θ is 6 °, until fusion groove exceedes breath arc during tubing two arris 1mm, fusion is identical every time, so that weld seam width and remaining
High uniformity.
In welding process, according to narrow gap, narrow gap pipe radian, welding wire and welding gun uninterruptedly change, and wherein, are soldered to
During 4 o'clock direction, welding gun and weld horizontal direction angle in 90 °, welding wire becomes 130 ° of angles with weld horizontal direction.
In sum, the present invention adopts vertical downward welding method, by making electric arc in welding with tungsten electrode arc thrust
During natural downslide certain angle thus completing to weld, solve the problems, such as to weld blind area many, effective control back of weld
Stay and indent phenomenon, and x-ray inspection qualification rate reaches 96%, welding method of the present invention is easy to operate, whole back of weld
Molding keeps uniformity with weld seam, and appearance of weld is attractive in appearance, has certain use value.
Above in association with accompanying drawing, the preferred embodiment of the present invention is described, but the invention is not limited in above-mentioned concrete
Embodiment, above-mentioned specific embodiment is only schematically, is not restricted, those of ordinary skill in the art
Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, can also make very
Multi-form, these belong within the scope of the present invention.
Claims (8)
1. a kind of pipeline narrow gap vertical downward TIG weld method is it is characterised in that comprise the following steps：
Step 1：Prepare before weldering, it is right that tubing is organized two-by-two, reserved fit-up gap, and according to size of pipe and tubing finished edge size；
Step 2：Welding wire and the selection of electric current, according to the size of tubing, welding personnel the proficiency level of welding is selected welding rod and
Electric current；
Step 3：Tack welding, the upper extreme point of the vertical line in tubing axle center is downhand welding point, and lower extreme point is overhead welding point, described downhand welding point and
Overhead welding point carries out tack welding respectively；
Step 4：Welding, welding is divided into left side welding sequence and right-hand part welding sequence by the vertical line in tubing axle center, described
The welding step of left side welding sequence and right-hand part welding sequence is as follows：
Carry out backing welding first, from downhand welding point striking, add welding wire, welding wire remains at the side at the groove back side, welding gun tungsten
Pole end is welded from welding wire groove one angle, θ of lateral opposite side natural downslide all the time, until breath arc；
Then it is filled with welding, be overlapped welding on the basis of backing welding；
Finally carry out cosmetic welding, after filling weldering, from downhand welding point striking, add welding wire, welding wire remains at the side of groove,
Welding gun tungsten electrode end is welded from welding wire groove one angle, θ of lateral opposite side natural downslide all the time, until breath arc.
2. pipeline narrow gap vertical downward TIG weld method according to claim 1 it is characterised in that：In described step 4,
The scope of one angle, θ of natural downslide is 4 °～8 °.
3. pipeline narrow gap vertical downward TIG weld method according to claim 1 it is characterised in that：In described step 3,
The tack welding length range of downhand welding point and overhead welding point is 20mm～30mm.
4. pipeline narrow gap vertical downward TIG weld method according to claim 1 it is characterised in that：In described step 4,
Described striking and breath arc position are located at the solid point welding line 5mm of welding direction of advance.
5. pipeline narrow gap vertical downward TIG weld method according to claim 1 it is characterised in that：In described step 4,
Welding wire is added when being located at the solid point welding line end of welding direction of advance in described striking and breath arc position, so that the solid point welding line back of the body
Face forming width and reinforcement uniformity, and welding wire remains at groove side.
6. pipeline narrow gap vertical downward TIG weld method according to claim 1 it is characterised in that：In described step 4,
Cease arc when fusing groove and exceeding tubing two arris 1mm, every time fusion identical so that weld seam width and reinforcement uniformity.
7. pipeline narrow gap vertical downward TIG weld method according to claim 1 it is characterised in that：Described groove adopts V
Type groove, bevel angle is in the range of 55 °～65 °.
8. the pipeline narrow gap vertical downward TIG weld method according to any one of claim 1-8 it is characterised in that：Described
The scope that fit-up gap reserved by tubing is 3～5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611019564.5A CN106475666B (en) | 2016-11-17 | 2016-11-17 | Pipeline narrow gap vertical downward TIG weld method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611019564.5A CN106475666B (en) | 2016-11-17 | 2016-11-17 | Pipeline narrow gap vertical downward TIG weld method |
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| Publication Number | Publication Date |
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| CN106475666A true CN106475666A (en) | 2017-03-08 |
| CN106475666B CN106475666B (en) | 2019-03-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109048000A (en) * | 2018-08-24 | 2018-12-21 | 中国华冶科工集团有限公司 | Boiler water wall obstacle welds single face welding and double face shaping welding method |
| CN109202227A (en) * | 2018-10-09 | 2019-01-15 | 中国电建集团山东电力建设第工程有限公司 | A kind of effective operating procedure for inhibiting almag TIG weld defect |
| CN111360366A (en) * | 2020-03-24 | 2020-07-03 | 江苏省沙钢钢铁研究院有限公司 | Welding method of full penetration overhead plate |
| CN114054906A (en) * | 2021-12-21 | 2022-02-18 | 武昌船舶重工集团有限公司 | Combined welding method of ultrahigh-strength steel |
| CN114131154A (en) * | 2021-11-04 | 2022-03-04 | 中广核研究院有限公司 | Welding method for low alloy steel adapter tube of reactor main equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109048000A (en) * | 2018-08-24 | 2018-12-21 | 中国华冶科工集团有限公司 | Boiler water wall obstacle welds single face welding and double face shaping welding method |
| CN109202227A (en) * | 2018-10-09 | 2019-01-15 | 中国电建集团山东电力建设第工程有限公司 | A kind of effective operating procedure for inhibiting almag TIG weld defect |
| CN111360366A (en) * | 2020-03-24 | 2020-07-03 | 江苏省沙钢钢铁研究院有限公司 | Welding method of full penetration overhead plate |
| CN114131154A (en) * | 2021-11-04 | 2022-03-04 | 中广核研究院有限公司 | Welding method for low alloy steel adapter tube of reactor main equipment |
| CN114054906A (en) * | 2021-12-21 | 2022-02-18 | 武昌船舶重工集团有限公司 | Combined welding method of ultrahigh-strength steel |
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