CN106475666B - Pipeline narrow gap vertical downward TIG weld method - Google Patents
Pipeline narrow gap vertical downward TIG weld method Download PDFInfo
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- CN106475666B CN106475666B CN201611019564.5A CN201611019564A CN106475666B CN 106475666 B CN106475666 B CN 106475666B CN 201611019564 A CN201611019564 A CN 201611019564A CN 106475666 B CN106475666 B CN 106475666B
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- welding
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- downhand
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Classifications
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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
- 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 methods, comprising: step 1: welding preparation；Step 2: the selection of welding rod and electric current；Step 3: tack welding, the upper extreme point of the vertical line in tubing axle center are downhand welding point, and lower extreme point is overhead welding point, and the downhand welding point and overhead welding point carry out tack welding respectively；Step 4: welding, the left side welding sequence and right side welding sequence being divided into the vertical line in tubing axle center, first progress backing welding, from downhand welding point striking, welding wire is added, welding gun tungsten electrode end is always from the side at the groove back side to one angle, θ of other side natural downslide at the groove back side, until breath arc；Then it is filled weldering；After filling weldering, cosmetic welding is carried out, from downhand welding point striking, adds welding wire, welding gun tungsten electrode end is always from a side of groove to one angle, θ of other side natural downslide, until breath arc.Operation of the present invention is convenient, welding blind area is few, can effectively improve pipeline solder yield, and control back of weld is stayed and indent phenomenon.
Description
Technical field
The present invention relates to welding techniques, and in particular to the welding method of pipeline narrow gap vertical downward.
Background technique
Generally use boiler heating in present city, welding is the important component of boiler quality, welding quality it is 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 which alloy material is also high temperature and pressure part, and traditional welding method from bottom to top is visited through X-ray detection X-ray
Hurting ratio is 50%；It is more to weld sight blind area: special narrow gap welding position, some welding position fists all can not be stretched, only
Welding gun capable of being held using two or three of fingers by stretching hand to go to weld, increasing sight blind area when putting on welding mask, welding operates
It is more difficult；And traditional welding method, the weld seam downhand welding back side are easy to stay, and x-ray film is assessed as not merging；Weld seam is faced upward
It welds the back side and is easy indent, x-ray film is assessed as serious undercut, and not merging with serious undercut is unqualified egative film, be will lead to
Waste of material, working efficiency is low, and speed of welding is slow, increases repair rate and labour cost.
In order to ensure welding quality and duration, need to improve above-mentioned welding method.
Summary of the invention
For the above-mentioned deficiency of the prior art, the purpose of the present invention is to provide it is a kind of it is easy to operate, welding blind area is few, energy
Enough effectively improve the pipeline narrow gap vertical downward TIG weld method of pipeline solder yield.
Above-mentioned purpose of the invention is realized by following technical solution:
The present invention provides a kind of pipeline narrow gap vertical downward TIG weld method, comprising the following steps:
Step 1: welding preparation is organized tubing pair two-by-two, reserves fit-up gap, and according to size of pipe and tubing finished edge ruler
It is very little；
Step 2: the selection of welding wire and electric current, according to the size of tubing, welding personnel selects weldering to the qualification of welding
Item and electric current；
Step 3: tack welding, the upper extreme point of the vertical line in tubing axle center are downhand welding point, and lower extreme point is overhead welding point, the downhand welding
Point and overhead welding point carry out tack welding respectively；
Step 4: welding is divided into left side welding sequence and right side welding sequence by welding, the vertical line in tubing axle center,
The welding step of the left side welding sequence and right side welding sequence is as follows:
Backing welding is carried out first, from downhand welding point striking, adds welding wire, and welding wire remains at the side at the groove back side, welds
Rifle tungsten electrode end is welded from welding wire groove side to one angle, θ of other side natural downslide always, until breath arc；
Then it is filled weldering, welding is overlapped on the basis of backing welding；
Cosmetic welding is finally carried out, after filling weldering, from downhand welding point striking, adds welding wire, welding wire remains at groove
Side, welding gun tungsten electrode end are welded from welding wire groove side to one angle, θ of other side natural downslide always, until breath arc.
Preferably, in the step 4, the range of the angle, θ of natural downslide is 4 °~8 °.
Preferably, the 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 the striking and breath arc position are located at the solid point welding line end of welding direction of advance,
So that tack welding back of weld forming width and reinforcement uniformity, and welding wire remains at groove side.
Preferably, when fuse groove be more than two arris 1mm of tubing when cease arc, fuse every time it is identical so that weld seam width with
Reinforcement uniformity.
Preferably, in the step 3, the tack welding length range of downhand welding point and overhead welding point is 20mm~30mm.
Preferably, it is 3~5mm that the tubing, which reserves the range of fit-up gap,.
Preferably, the groove uses double V-groove, and bevel angle is within the scope of 55 °~65 °.
Relative to traditional welding method from bottom to top, inventive pipeline narrow gap vertical downward TIG weld method has
It is below the utility model has the advantages that
1) present invention is by making one jiao of θ of electric arc natural downslide with tungsten electrode arc thrust and remaining at groove
Welding wire is added in side, be effectively controlled back of weld stay with indent phenomenon, keep the molding of entire back of weld with weld seam
Uniformity, width and reinforcement uniformity.
2) present invention reduces narrow, pipeline using the welding of the vertical downward of left side welding sequence and right side welding sequence
Sight blind area when gap is welded.
3) present invention reaches 96% or more through X-ray detection flaw detection qualification rate.
In conclusion repair rate can be reduced using inventive pipeline narrow gap vertical downward TIG weld method, improve
Working efficiency；Material is saved, it is effective to improve pipeline solder yield.
Detailed description of the invention
Fig. 1 is that the present invention two tubing to be welded are horizontally arranged schematic diagram.
Fig. 2 is tack welding downhand welding point of the present invention and the schematic diagram for facing upward bond pad locations.
Fig. 3 is the electric arc walking path schematic diagram of left side welding sequence and right side welding sequence of the present invention.
Natural downslide angle schematic diagram when Fig. 4 is backing welding and cosmetic welding of the present invention welding.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description:
As shown in Figs 1-4, inventive pipeline narrow gap vertical downward TIG weld method is as follows:
Step 1: welding preparation, by all tubing 1 and tubing 2 according to the horizontal positioned group pair two-by-two of clearance requirement, two tubing
Between reserve fit-up gap d be 3~5mm,
Further, it is 4mm that fit-up gap d is reserved between tubing 1 and tubing 2,
And processing double V-groove is required according to size of pipe and tubing and bevel angle, bevel angle is within the scope of 55 °~65 °,
Further, bevel angle opens 60 °, and root face is 0.5 ㎜,
Then to being cleared up at the 20mm of in two tube grooves and pipeline two sides.
Step 2: the selection of welding rod and electric current, according to size of the tubing such as thickness of diameter, tube wall etc. and welding personnel
To the qualification of welding, suitable welding rod and electric current are selected,
Further, the tubing 1 and tubing 2 for selecting Φ 38*5mm (pipe diameter * tubing thickness), select diameter for 1.6
The welding rod of~2 ㎜, electric current is within the scope of 100~120A.
Step 3: tack welding, the upper extreme point of the vertical line in tubing axle center are downhand welding point P1, and lower extreme point is overhead welding point P2, described
Downhand welding point P1 and overhead welding point P2 carry out tack welding respectively；Tack welding length range is 20mm~30mm,
Further, the tack welding length of the 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 side welding sequence is welded
It connects, welding step is as follows:
Backing welding is carried out first, and before welding, welding wire extend into the tack welding side of downhand welding point P1 inside weld gap, weldering
Welding wire remains at the side at the groove back side when connecing；
Striking, the striking since the direction of advance of downhand welding point P1 is away from from 0.5 ㎜ of weld seam one end, the solid point of heated flat solder joint P1
Welding line adds welding wire when being melted to solid point welding line end so that the tack welding back of weld forming width of downhand welding point P1 and
Reinforcement uniformity, welding wire remain at the side at the groove back side；
Electric arc moving direction makes the other side of the electric arc from the side at the groove back side to the groove back side with tungsten electrode arc thrust
One jiao of θ of natural downslide, one jiao of θ of the natural downslide are 6 °, until to overhead welding welding line joint position；
Arc is ceased, 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 remain at the side at the groove back side, are welded to the solid point of overhead welding point P2
When welding line is melted at 0.5mm, arc is ceased.
Then it is filled weldering, welding is overlapped on the basis of backing welding.
Cosmetic welding is finally carried out, after filling weldering, from downhand welding point P1 striking, adds welding wire, welding wire remains groove one
Side makes the one jiao of θ of other side natural downslide of electric arc from a side of groove to groove, the natural downslide with tungsten electrode arc thrust
One jiao of θ is 6 °, until fusion groove ceases arc when being more than two arris 1mm of tubing, fuse every time it is identical 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, wherein are soldered to
When 4 o'clock direction, welding gun and weld horizontal direction angle in 90 °, welding wire and weld horizontal direction are at 130 ° of angles.
In conclusion the present invention uses vertical downward welding method, by welding electric arc with tungsten electrode arc thrust
Natural downslide certain angle solves the problems, such as that welding blind area is more, effectively controls back of weld in the process to complete to weld
Stay with indent phenomenon, and x-ray inspection qualification rate reaches 96%, and welding method of the present invention is easy to operate, entire back of weld
Molding keeps uniformity with weld seam, and appearance of weld is beautiful, has certain use value.
The preferred embodiment of the present invention is described in conjunction with attached drawing above, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, is not restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very
Multi-form, these all fall within the protection scope of the present invention.
Claims (7)
1. a kind of pipeline narrow gap vertical downward TIG weld method, which comprises the following steps:
Step 1: welding preparation is organized tubing pair two-by-two, reserves fit-up gap, and according to size of pipe and tubing finished edge size；
Step 2: the selection of welding wire and electric current, according to the size of tubing, welding personnel to the qualification selection welding wire of welding and
Electric current；
Step 3: tack welding, the upper extreme point of the vertical line in tubing axle center are downhand welding point, and lower extreme point is overhead welding point, the 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 side welding sequence by the vertical line in tubing axle center, described
The welding step of left side welding sequence and right side welding sequence is as follows:
Backing welding is carried out first, from downhand welding point striking, adds welding wire, welding wire remains at the side at the groove back side, with tungsten
Pole electrical arc thrust, welding gun tungsten electrode end is always from a side at the welding wire groove back side to the groove back side other side one angle of natural downslide
Degree θ is welded, and the range of θ is 4 °~8 °, until breath arc；
Then it is filled weldering, welding is overlapped on the basis of backing welding；
Cosmetic welding is finally carried out, after filling weldering, from downhand welding point striking, adds welding wire, welding wire remains at the side of groove,
With tungsten electrode arc thrust, welding gun tungsten electrode end is welded from welding wire groove side to one angle, θ of other side natural downslide always
It connects, the range of θ is 4 °~8 °, until breath arc.
2. pipeline narrow gap vertical downward TIG weld method according to claim 1, it is characterised in that: in the step 3,
The tack welding length range of downhand welding point and overhead welding point is 20mm~30mm.
3. pipeline narrow gap vertical downward TIG weld method according to claim 1, it is characterised in that: in the step 4,
The striking and breath arc position are located at the solid point welding line 5mm of welding direction of advance.
4. pipeline narrow gap vertical downward TIG weld method according to claim 1, it is characterised in that: in the step 4,
Welding wire is added when being located at the solid point welding line end of welding direction of advance in the striking and breath arc position, so that solid point welding line is carried on the back
Face forming width and reinforcement uniformity, and welding wire remains at groove side.
5. pipeline narrow gap vertical downward TIG weld method according to claim 1, it is characterised in that: in the step 4,
Arc is ceased when fusing groove and being more than two arris 1mm of tubing, is fused every time identical so that weld seam width and reinforcement uniformity.
6. pipeline narrow gap vertical downward TIG weld method according to claim 1, it is characterised in that: the groove uses V
Type groove, bevel angle is within the scope of 55 °~65 °.
7. pipeline narrow gap vertical downward TIG weld method according to claim 1-6, it is characterised in that: described
The range that tubing reserves fit-up gap 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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| CN106475666A CN106475666A (en) | 2017-03-08 |
| CN106475666B true CN106475666B (en) | 2019-03-26 |
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| CN109048000B (en) * | 2018-08-24 | 2021-03-23 | 中国华冶科工集团有限公司 | One-side welding and two-side forming welding method for barrier welding of boiler water-cooling wall |
| 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 |
| CN114054906B (en) * | 2021-12-21 | 2023-04-18 | 武昌船舶重工集团有限公司 | Combined welding method of ultrahigh-strength steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006247673A (en) * | 2005-03-09 | 2006-09-21 | Hitachi Ltd | Method of welding procedure for pipe |
| CN1883865A (en) * | 2005-06-23 | 2006-12-27 | 上海锅炉厂有限公司 | Butt welding method for pipe with small diameter |
| CN100450692C (en) * | 2006-08-25 | 2009-01-14 | 中国核工业第二三建设公司 | Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method |
| CN100450688C (en) * | 2007-07-04 | 2009-01-14 | 中国石油天然气集团公司 | Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method |
| CN102528237B (en) * | 2012-01-18 | 2013-09-04 | 江苏中核利柏特股份有限公司 | Welding process for carbon steel process pipeline |
| CN102581430B (en) * | 2012-03-22 | 2014-04-09 | 上海锅炉厂有限公司 | Middle layer welding method of inclined tube |
| CN102653022B (en) * | 2012-05-16 | 2015-06-17 | 中国核工业二三建设有限公司 | Method for welding narrow-gap butt-joint connector of pipeline with large pipe diameter and thick wall |
| CN102935545A (en) * | 2012-11-14 | 2013-02-20 | 哈尔滨汽轮机厂有限责任公司 | Narrow-gap metal active gas (MAG) welding method for large-thickness shroud type diaphragms of turbines |
| CN104014909B (en) * | 2014-06-24 | 2016-02-10 | 中国华冶科工集团有限公司 | Method for welding pipeline |
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