CN113523574B - Full penetration welding method for marine pipe fitting - Google Patents

Full penetration welding method for marine pipe fitting Download PDF

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Publication number
CN113523574B
CN113523574B CN202110800020.7A CN202110800020A CN113523574B CN 113523574 B CN113523574 B CN 113523574B CN 202110800020 A CN202110800020 A CN 202110800020A CN 113523574 B CN113523574 B CN 113523574B
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welding
gmaw
welded
pipe fitting
pipe
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CN113523574A (en
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毕学松
侯艳喜
柳春恕
曹东生
董传阳
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Tangshan Kaiyuan Welding Automation Technology Institute Co ltd
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Tangshan Kaiyuan Welding Automation Technology Institute Co ltd
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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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60—Preliminary treatment
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention relates to a full penetration welding method for a marine pipe fitting, and belongs to the technical field of ship construction. The invention comprises the following steps: firstly, processing a groove and assembling a pipe fitting to be welded, and performing tack welding; rotating the pipe fitting to be welded, and GMAW welding for the first time; rotating the pipe fitting to be welded, and welding a second pass by laser-GMAW composite welding; and step four, rotating the pipe fitting to be welded, and performing filling welding and cover surface welding by using GMAW (gas metal arc welding). The invention has better adaptability to workpiece processing and assembly precision, can realize full penetration welding only by ensuring that the assembly clearance of the pipe fittings to be welded is not more than 3mm and the misalignment is not more than 2mm, does not need to process the marine pipe fittings at high precision, ensures the welding quality and improves the welding efficiency.

Description

Full penetration welding method for marine pipe fitting
Technical Field
The invention relates to a full penetration welding method for marine pipe fittings, in particular to a full penetration welding method for marine pipes and pipe elbows, and belongs to the technical field of ship construction.
Background
Pipe welding is one of the important tasks in the shipbuilding process, wherein the butt welding process of pipes and elbow is complex, and a full penetration weld joint is generally required to be obtained. The traditional welding method of the marine pipe fitting comprises welding rod welding and CO 2 Welding, MIG/MAG welding, TIG welding and the like, has low automation degree, poor welding quality stability and low production efficiency, and is difficult to meet the requirements of shipyards on high-efficiency full penetration welding technology.
Laser-arc hybrid welding is a welding method in which an arc is combined with a laser to obtain a large penetration depth. Two heat sources with different physical properties and energy transmission mechanisms are compounded together to jointly act on the surface of a workpiece, and the workpiece is heated to complete the welding process. The laser-arc hybrid welding is a welding method suitable for full penetration, can obviously improve the welding efficiency and quality, but has high requirements on the processing dimensional precision of workpieces and the precision of a pre-welding group. The Chinese patent application No. 202011295042.4, published as 3.9.2021, entitled "method for single-side welding of thick ship plate", discloses a method for laser hybrid welding priming and GMAW (gas metal arc welding for short) cover welding of thick ship plate, and the butt-joint gap of workpiece is 0.7-0.9 mm. The Chinese patent application No. 202011145423.4, published as 12 and 29 days in 2020, entitled "a shipyard thin plate jointed plate butt-joint laser composite welding system", and the Chinese patent application No. 202010450603.7, published as 9 and 11 days in 2020, entitled "marine flat plate butt-welding system, butt-welding method and plane segmentation processing line" all disclose the laser composite welding system of marine flat plates, and realize the full penetration welding of ship plate splicing. The above patents essentially ensure that the assembly precision of workpieces to be welded meets the requirement by establishing a production line comprising units such as feeding, transporting, milling, welding and discharging, and the like, thereby realizing the full penetration welding of the laser composite welding.
For welding marine pipe fittings, due to the fact that the wall thickness, diameter, length, material and other specifications of the pipe fittings are diversified, the roundness consistency of the steel pipe is poor and the like, the precision of key machining dimensions such as the groove angle and the truncated edge of the pipe fittings and the assembly precision before welding are difficult to guarantee, the welding requirements of laser-arc hybrid welding cannot be met, and therefore full penetration welding cannot be achieved simply through laser hybrid welding.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a full penetration welding method for marine pipe fittings, which is suitable for large pipe fitting machining precision and assembly clearance range, reduces the machining working hours before welding the marine pipe fittings and improves the welding quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a full penetration welding method for marine pipe fittings comprises the following steps:
the method comprises the following steps: processing a groove and assembling the pipe fittings to be welded, and performing tack welding;
step two: rotating the pipe fittings to be welded, GMAW welding for the first time, and filling gaps between the pipe fittings to be welded;
step three: rotating the pipe fitting to be welded, and performing laser-GMAW composite welding for a second time; the laser beam penetrates through the first welding line and the non-welded area at the root part of the groove, and complete penetration is realized under the combined action of the laser beam and the GMAW electric arc;
step four: and rotating the pipe to be welded, and performing filling welding and cover surface welding by using GMAW (gas metal arc welding) to obtain the full penetration weld of the marine pipe.
The innovation points of the invention are as follows: because GMAW treats the pipe fitting dimensional machining precision and group to the clearance insensitive, adopt GMAW welding first pass, fill the clearance between the pipe fitting of treating welding. On the basis, a second welding pass is welded by adopting laser-GMAW (gas metal arc welding), a laser beam penetrates through a first welding seam and an unwelded area at the root of the groove, and the back surface is completely melted through under the combined action of the laser beam and a GMAW electric arc. The problem of laser GMAW composite welding treat welded pipe fitting size machining precision and group to the clearance high requirement is solved. And filling and capping welding to obtain the full penetration weld of the marine pipe.
Preferably, in the first step, the bevel is in a V shape, and the bevel angle is alpha 0 The angle is 40-60 degrees, the assembly gap is 0-3 mm, and the misalignment amount is 0-2 mm.
Preferably, the maximum distance d from the highest point of the surface of the positioning welding point to the inner wall of the pipe fitting to be welded 0 ≤3mm。
Preferably, the second step adopts downhill welding, and the included angle alpha between the first GMAW welding wire and the vertical direction in the first GMAW welding process 1 40-50 degrees, and the contact point O of the GMAW welding wire I and the pipe fitting to be welded 1 Distance d to vertical plane passing through center O of cross section of pipe fitting to be welded 1 Is 0.25 to 0.4 times of the diameter of the pipe fitting to be welded; the welding current is 100-150A, and the welding speed is 100-320 mm/min; when the pairing gap is smaller than 1mm, the GMAW welding wire does not swing; when the pairing gap is 1-3 mm, the GMAW welding wire swings at a swing frequency of 0.5-1.5 Hz and a swing amplitude of 1-1.5 mm.
Preferably, the third step adopts downhill welding, and the second laser-GMAW composite welding of the laser-GMAW composite welding comprises a laser beam and a GMAW electric arc; in the welding direction, the laser beam is forward and the GMAW arc is backward; included angle alpha between laser beam and GMAW welding wire 3 Is 25 to 60 DEG, filament spacing d 3 0-4 mm, and the included angle alpha between the GMAW welding wire II and the horizontal direction 2 Is 85-95 degrees, and the contact point O of a GMAW welding wire II and a pipe fitting to be welded 2 Distance d to vertical plane passing through center O of cross section of pipe fitting to be welded 2 Is 0.15 to 0.4 times of the diameter of the pipe fitting to be welded; the laser power is 4-8 kW, the welding current is 80-240A, the welding speed is 500-1000 mm/min, and the defocusing amount is-5 to +5 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention has better adaptability to workpiece processing and assembly precision, can realize full penetration welding only by ensuring that the assembly clearance of the marine pipe fitting is not more than 3mm and the misalignment is not more than 2mm, does not need to process the marine pipe fitting at high precision, improves the welding efficiency and ensures the welding quality.
Drawings
FIG. 1 is a schematic diagram of a groove of a pipe to be welded;
FIG. 2 is a schematic view of a two-GMAW welding position of the present invention;
FIG. 3 is a schematic view of the laser beam and GMAW wire two position of the present invention in a three step process;
FIG. 4 is a schematic view of a three-step laser-GMAW hybrid welding position of the present invention;
FIG. 5 is a front view of a weld joint of the present embodiment;
FIG. 6 is a photograph showing the appearance of the back of a weld according to an embodiment;
FIG. 7 is a cross-sectional profile of a weld of an embodiment;
FIG. 8 is a front view of a weld joint of the second embodiment;
FIG. 9 is a back appearance forming picture of a weld joint of the second embodiment;
FIG. 10 is a cross-sectional view of a weld of example two;
FIG. 11 is a front appearance forming picture of a triple weld seam of the embodiment;
FIG. 12 is a back appearance forming picture of a triple weld of the example;
FIG. 13 is a cross-sectional profile of a triple weld of the example;
the figures are labeled as follows: 1 is a pipe fitting to be welded; 2 is a laser beam; 3 is GMAW welding wire I; 4 is GMAW weldingII, silk II; alpha is alpha 0 Is a bevel angle; alpha is alpha 1 Forming an included angle between a GMAW welding wire I and the vertical direction; alpha is alpha 2 Forming an included angle between a GMAW welding wire II and the horizontal direction; alpha is alpha 3 Forming an included angle between a laser beam and a GMAW welding wire; d is a radical of 0 The maximum distance from the highest point of the surface of the positioning welding spot to the inner wall of the pipe fitting to be welded; d is a radical of 1 For GMAW welding wire I and the contact point O of the pipe fitting to be welded 1 The distance to a vertical plane passing through the center O of the cross section of the pipe fitting to be welded; d 2 Is the contact point O of a GMAW welding wire II and a pipe fitting to be welded 2 The distance to a vertical plane passing through the center O of the cross section of the pipe fitting to be welded; d 3 Is the filament spacing; o is the center of the cross section of the pipe fitting to be welded; o is 1 The contact point of a GMAW welding wire I and a pipe fitting to be welded is set; o is 2 The contact point of the GMAW welding wire two and the pipe fitting to be welded is shown.
Detailed Description
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, a method for fully penetration welding of marine pipe fittings comprises the following steps:
the method comprises the following steps: processing a groove and assembling the pipe fittings to be welded, and performing tack welding;
step two: rotating the pipe fittings to be welded, GMAW welding for the first time, and filling gaps between the pipe fittings to be welded;
step three: rotating the pipe to be welded, and performing laser-GMAW composite welding for a second time; the laser beam penetrates through the first welding line and the unwelded area at the root part of the groove, and complete penetration is realized under the combined action of the laser beam and the GMAW electric arc;
step four: and rotating the pipe to be welded, and performing filling welding and cover surface welding by using GMAW (gas metal arc welding) to obtain the full penetration weld of the marine pipe.
In the step one, the groove is V-shaped, and the angle of the groove is alpha 0 The angle is 40-60 degrees, the assembly gap is 0-3 mm, and the misalignment amount is 0-2 mm.
Maximum distance d from the highest point of the surface of the positioning welding spot to the inner wall of the pipe fitting 1 to be welded 0 ≤3mm。
Step two, adopting downhill welding, and welding a first GMAW welding wire I3 of a first pass by GMAW and an included angle alpha between the welding wire and the vertical direction 1 Is 40 to 50Contact point O of GMAW welding wire-3 and pipe fitting 1 to be welded 1 To a vertical plane passing through the centre O of the cross-section of the pipe 1 to be welded 1 Is 0.25 to 0.4 times of the diameter of the pipe fitting 1 to be welded; the welding current is 100-150A, and the welding speed is 100-320 mm/min; when the pairing gap is smaller than 1mm, the GMAW welding wire I3 does not swing; when the pairing gap is 1-3 mm, the GMAW welding wire I3 swings, the swing frequency is 0.5-1.5 Hz, and the swing amplitude is 1-1.5 mm.
Thirdly, adopting downhill welding, wherein laser-GMAW composite welding comprises laser beam 2 and GMAW electric arc; in the welding direction, the laser beam 2 is forward and the GMAW arc is backward; an included angle alpha is formed between the laser beam 2 of the second laser-GMAW composite welding and the GMAW welding wire two 4 3 Is 25-60 degrees and the distance d between the light filaments 3 0-4 mm, and the included angle alpha between the GMAW welding wire II 4 and the horizontal direction 2 Is 85-95 degrees, and the contact point O of GMAW welding wire two 4 and the pipe fitting 1 to be welded 2 To a vertical plane passing through the centre O of the cross-section of the pipe 1 to be welded 2 Is 0.15 to 0.4 times of the diameter of the pipe fitting 1 to be welded; the laser power is 4-8 kW, the defocusing amount is-5 to +5mm, the welding current is 80-240A, and the welding speed is 500-1000 mm/min.
The first embodiment is as follows:
the pipe fitting 1 to be welded is a carbon steel pipe for a ship, the diameter of the carbon steel pipe is 160mm, the wall thickness of the carbon steel pipe is 12mm, the welding joint is in butt joint, and the welding wire is ER 50-6.
The implementation mode is as follows:
the method comprises the following steps: a V-shaped groove is formed on the pipe fitting 1 to be welded, and the angle of the groove is 60 degrees; then, assembling is carried out, so that the assembling gap is 0, the misalignment amount is 0-2 mm, tack welding is carried out, and the maximum distance d from the highest point of the surface of a tack welding spot to the inner wall of the pipe fitting 1 to be welded is the maximum distance 0 Is 2 mm;
step two: included angle alpha between GMAW welding wire I3 and vertical direction 1 At 45 degrees, the contact point O of a GMAW welding wire I3 and the pipe fitting 1 to be welded 1 To a vertical plane passing through the centre O of the cross-section of the pipe 1 to be welded 1 Is 50 mm; the welding current is 130A, the welding speed is 300 mm/min, and a first GMAW welding wire 3 does not swing; the pipe fitting 1 to be welded rotates, downhill welding is adopted, and GMAW welding is carried out for the first time;
step three: in the welding direction, the laser beam 2 is in front,after GMAW arc; included angle alpha between laser beam 2 and GMAW welding wire two 4 3 Is 30 degrees and the distance d between the filaments 3 2mm, and the included angle alpha between the GMAW welding wire two 4 and the horizontal direction 2 Is 90 degrees, and the contact point O of the GMAW welding wire two 4 and the pipe fitting 1 to be welded 2 To a vertical plane passing through the centre O of the cross-section of the pipe 4 to be welded 2 Is 50 mm; the laser power is 5kW, the defocusing amount is 0, the welding current is 130A, and the welding speed is 600 mm/min; rotating the pipe fitting 1 to be welded, and welding a second pass by adopting downhill welding and laser-GMAW composite welding;
step four: and (4) rotating the pipe fitting 1 to be welded, and performing filling welding and cover surface welding by using GMAW.
The welding results are shown in fig. 5, 6 and 7, and the weld was formed well, fully penetrated and free of defects.
Example two:
the pipe fitting 1 to be welded is a carbon steel pipe for a ship, the diameter of the carbon steel pipe is 160mm, the wall thickness of the carbon steel pipe is 12mm, the welding joint is in butt joint, and the welding wire is ER 50-6.
The implementation mode is as follows:
the method comprises the following steps: a V-shaped groove is formed on the pipe fitting 1 to be welded, and the angle of the groove is 60 degrees; then, assembling is carried out, the assembling gap is 2mm, the misalignment amount is 0-2 mm, tack welding is carried out, and the maximum distance d from the highest point of the surface of a tack welding point to the inner wall of the pipe fitting 1 to be welded is the maximum distance 0 Is 2 mm;
step two: included angle alpha between GMAW welding wire I3 and vertical direction 1 At 45 degrees, the contact point O of a GMAW welding wire I3 and the pipe fitting 1 to be welded 1 To a vertical plane passing through the centre O of the cross-section of the pipe 1 to be welded 1 Is 50 mm; the welding current is 130A, and the welding speed is 220 mm/min; the GMAW welding wire I3 swings, the swing frequency is 1.0Hz, and the swing amplitude is 1.0 mm; the pipe fitting 1 to be welded rotates, downhill welding is adopted, and GMAW welding is carried out for the first time;
step three: in the welding direction, the laser beam 2 is forward and the GMAW arc is backward; included angle alpha between laser beam 2 and GMAW welding wire two 4 3 Is 30 degrees and the distance d between the filaments 3 2mm, and the included angle alpha between the two 4 GMAW welding wires and the horizontal direction 2 Is 90 degrees, and the contact point O of the GMAW welding wire two 4 and the pipe fitting 1 to be welded 2 To a vertical plane passing through the centre O of the cross-section of the pipe 1 to be welded 2 Is 50 mm;the laser power is 5kW, the defocusing amount is 0, the welding current is 130A, and the welding speed is 600 mm/min; rotating the pipe fitting 1 to be welded, and welding a second pass by adopting downhill welding and laser-GMAW composite welding;
step four: and (4) rotating the pipe fitting 1 to be welded, and performing filling welding and facing welding by using GMAW (gas metal arc welding).
The welding results are shown in fig. 8, 9 and 10, and the weld was formed well, fully penetrated and free of defects.
Example three:
the pipe fitting 1 to be welded is a carbon steel pipe for a ship, the diameter of the carbon steel pipe is 160mm, the wall thickness of the carbon steel pipe is 12mm, the welding joint is in butt joint, and the welding wire is ER 50-6.
The implementation mode is as follows:
the method comprises the following steps: a V-shaped groove is formed on the pipe fitting 1 to be welded, and the angle of the groove is 60 degrees; then, assembling, enabling the assembling gap to be 3mm, enabling the misalignment amount to be 0-2 mm, performing tack welding, and enabling the maximum distance d from the highest point of the surface of a tack welding point to the inner wall of the pipe fitting to be welded 0 Is 2 mm;
step two: included angle alpha between GMAW welding wire I3 and vertical direction 1 At 50 degrees, the contact point O of a GMAW welding wire I3 and a pipe fitting 1 to be welded 1 Distance d to vertical plane passing through center O of cross section of pipe fitting 1 to be welded 1 Is 50 mm; the welding current is 130A, and the welding speed is 160 mm/min; the GMAW welding wire I3 swings, the swing frequency is 1.0Hz, and the swing amplitude is 1.5 mm; the pipe fitting 1 to be welded rotates, downhill welding is adopted, and GMAW welding is carried out for the first time;
step three: in the welding direction, the laser beam 2 is forward and the GMAW arc is backward; included angle alpha between laser beam 2 and GMAW welding wire two 4 3 Is 30 DEG, the filament spacing d 3 2mm, and the included angle alpha between the two 4 GMAW welding wires and the horizontal direction 2 Is 90 degrees, and the contact point O of the GMAW welding wire two 4 and the pipe fitting 1 to be welded 2 To a vertical plane passing through the centre O of the cross-section of the pipe 1 to be welded 2 Is 50 mm; the laser power is 5kW, the defocusing amount is 0, the welding current is 130A, and the welding speed is 600 mm/min; rotating the pipe fitting 1 to be welded, and welding a second pass by adopting downhill welding and laser-GMAW composite welding;
step four: and (4) rotating the pipe fitting 1 to be welded, and performing filling welding and facing welding by using GMAW (gas metal arc welding).
The welding results are shown in fig. 11, 12 and 13, and the weld was formed well, fully penetrated and free of defects.

Claims (4)

1. A full penetration welding method for marine pipe fittings is characterized by comprising the following steps:
the method comprises the following steps: processing a pairing groove of the pipe fitting to be welded, carrying out pairing tack welding, wherein the pairing groove is V-shaped, and the angle alpha of the pairing groove 0 The angle is 40-60 degrees, the assembly gap is 2-3 mm, and the misalignment amount is 0-2 mm;
step two: rotating the pipe fittings to be welded, GMAW welding for the first time, and filling gaps between the pipe fittings to be welded;
step three: rotating the pipe to be welded, and performing laser-GMAW composite welding for a second time; the laser beam penetrates through the first welding line and the unwelded area at the root part of the groove, and complete penetration is realized under the combined action of the laser beam and the GMAW electric arc;
step four: and (4) rotating the pipe fitting to be welded, and performing filling welding and cover surface welding by using GMAW (gas metal arc welding) to obtain a full penetration weld of the marine pipe.
2. The full penetration welding method for the marine pipe fitting according to claim 1, characterized in that: the second step adopts downhill welding, and the included angle alpha between a first GMAW welding wire and the vertical direction in the first GMAW welding process 1 40-50 degrees, and a contact point O of a GMAW welding wire I and a pipe fitting to be welded 1 Distance d to vertical plane passing through center O of cross section of pipe fitting to be welded 1 Is 0.25 to 0.4 times of the diameter of the pipe fitting to be welded; the welding current is 100-150A, and the welding speed is 100-320 mm/min; the GMAW welding wire swings at a frequency of 0.5-1.5 Hz and a swing amplitude of 1-1.5 mm.
3. The full penetration welding method for the marine pipe fitting according to claim 1, characterized in that: thirdly, adopting downhill welding, wherein laser-GMAW composite welding comprises a laser beam and a GMAW electric arc; in the welding direction, the laser beam is forward and the GMAW arc is backward; included angle alpha between laser beam of second pass of laser-GMAW composite welding and GMAW welding wire 3 Is 25-60 degrees and the distance d between the light filaments 3 0-4 mm, GMAW welding wire two and horizontalIncluded angle alpha between 2 Is 85-95 degrees, and the contact point O of the GMAW welding wire II and the pipe fitting to be welded 2 Distance d to vertical plane passing through center O of cross section of pipe fitting to be welded 2 Is 0.15 to 0.4 times of the diameter of the pipe fitting to be welded; the laser power is 4-8 kW, the welding current is 80-240A, the welding speed is 500-1000 mm/min, and the defocusing amount is 0-5 mm.
4. The full penetration welding method for the marine pipe fitting according to claim 1, characterized in that: the maximum distance d from the highest point of the surface of the positioning welding spot to the inner wall of the pipe fitting to be welded 0 ≤3mm。
CN202110800020.7A 2021-07-15 2021-07-15 Full penetration welding method for marine pipe fitting Active CN113523574B (en)

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Publication number Priority date Publication date Assignee Title
JPS608916B2 (en) * 1982-10-06 1985-03-06 工業技術院長 Welding method using laser and MIG
JP5416422B2 (en) * 2009-01-26 2014-02-12 株式会社神戸製鋼所 Laser-arc combined welding method
CN103394815B (en) * 2013-08-14 2016-01-20 哈尔滨工业大学 A kind of method of circumferential weld laser-GMA composite welding
CN108941913A (en) * 2018-08-14 2018-12-07 辽宁增材制造产业技术研究院有限公司 A kind of efficient laser-MAG compound welding method of slab marine high strength steel
CN109454333A (en) * 2018-11-30 2019-03-12 上海航天精密机械研究所 Spinning part circumferential weld laser-GMA complex welding method
CN112453707A (en) * 2020-11-18 2021-03-09 上海中船临港船舶装备有限公司 Method for welding thick plate of ship on single surface
CN112756788A (en) * 2021-02-19 2021-05-07 东方电气集团东方锅炉股份有限公司 Welding process suitable for deep groove between tube plate and heat exchange tube

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