CN110883407A - Method for solving welding joint defects in production - Google Patents
Method for solving welding joint defects in production Download PDFInfo
- Publication number
- CN110883407A CN110883407A CN201911018223.XA CN201911018223A CN110883407A CN 110883407 A CN110883407 A CN 110883407A CN 201911018223 A CN201911018223 A CN 201911018223A CN 110883407 A CN110883407 A CN 110883407A
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- welding
- joint
- groove
- backing
- ceramic liner
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- 238000003466 welding Methods 0.000 title claims abstract description 114
- 230000007547 defect Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 29
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000005498 polishing Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000011324 bead Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000003371 toe Anatomy 0.000 description 1
Images
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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to a method for solving the defects of a welding joint in production, which comprises the following steps: s1, cleaning a welding groove before welding, wherein the angle of the welding groove is 40-50 degrees; s2, leaving a gap at the bottom of the groove, pasting a first section of ceramic liner on the back of the welding groove, and pasting the ceramic liner in sections; s3, performing backing welding, checking and polishing shrinkage cavity defects generated by the backing welding, and pasting a next section of ceramic liner to finish the next section of backing welding; and S4, performing filling welding and cover surface welding after backing welding is completed. The method can determine the position of the welding joint, is convenient for flaw detection of the welding joint, and can timely treat the defects of the outer pipe of the welding joint.
Description
Technical Field
The invention relates to the technical field of steel plate welding, in particular to a method for overcoming the defect of a welding joint in production.
Background
Because the reason of welding seam operation length, the welder can not carry out welding operation for a long time in welding production, must have welded joint's appearance this moment, and in actual welding process, welding seam groove both sides need install the location horse board before the welding, and the welder welds the location horse board position and also must stop in welding process, also can appear welded joint this moment.
The welding joint is a weak link of a welding structure, the welding joint part is often a starting point of structural damage, and the welding joint has the following characteristics:
1. the structure and the performance are uneven, the weld metal and the base metal are different in chemical composition, and different degrees of difference exist in the metal structure of each area of the welding joint when different welding thermal cycles and thermal strain cycles are subjected to, so that the mechanical property, the physical property, the chemical property and other properties of the welding joint are uneven.
2. Geometric discontinuities, which are geometric discontinuities that transmit complex stresses during operation, when the joint is located in a region where the geometry and dimensions of the mechanism change. Even with butt joints, stress concentrations of varying degrees can occur at the weld toes as long as the residual height exists. The misalignment, welding defect, deformation and the like in the production process all aggravate stress concentration, and the distribution of the working stress of the joint is more complicated.
3. The residual stress and deformation are generated, the heat source is concentrated on the joint position in the welding process, and the high welding residual stress and deformation are generated under the uneven temperature field, so that the joint area reaches the yield point and the strength limit too early, and the rigidity, the dimensional stability and other service performances of the structure are influenced.
In the welding production, because of the length of the welding seam operation, a welder cannot perform the welding operation for a long time, and a welding joint is inevitably generated at the moment. In actual production, positioning horse plates need to be installed on two sides of a welding seam groove before welding, a welder needs to stay at the position of the positioning horse plates when welding, and a welding joint can also appear at the moment. The welding joint is a necessary product in production and is unavoidable, so that how to reasonably solve the defect problem of the welding joint in production has very important significance for improving the use reliability of a welding structure.
Disclosure of Invention
In order to solve the problem of the defects of the welding joint in the welding process and improve the welding quality, the invention provides a method for solving the defects of the welding joint in production, and the technical purpose of the invention is realized by the following technical scheme:
a method for addressing weld joint defects in production, the method comprising the steps of:
s1, cleaning the welding groove before welding, removing oil stain, rust, scale and other substances which influence welding on the surface of the groove and the width range of 20mm on the two sides of the groove, wherein the angle of the welding groove is 40-50 degrees;
s2, leaving a gap at the bottom of the groove, pasting a first section of ceramic liner on the back of the welding groove, and pasting the ceramic liner in sections;
s3, performing backing welding, checking and polishing shrinkage cavity defects generated by the backing welding, and pasting a next section of ceramic liner to finish the next section of backing welding;
and S4, performing filling welding and cover surface welding after backing welding is completed.
Further, in S2, the fitting gap at the root of the groove is 4 to 12 mm.
Further, in S3, after the welding at the first segment ceramic liner is completed, a welding joint is left at the welding end at the first segment ceramic liner.
Further, in S3, 175-230A of backing welding current and 20-27V of voltage are adopted, and flux-cored wire with diameter of 1.4mm approved by classification society is adopted as the selected welding material.
Further, in S4, fill welding is performed first, and after the fill welding is completed, cover surface welding is performed.
The method has the advantages that the method can visually detect the defects of the outer pipe at the welding joint, and in addition, because 100% nondestructive detection can not be carried out on each welding line in production, the method can focus on flaw detection at the welding joint, carry out remedial measures in time and reduce the quality problem at the welding joint.
Drawings
Fig. 1 is a schematic view of a welding groove.
Fig. 2 is a schematic view of a ceramic liner installation.
Fig. 3 is a groove welding sequence diagram.
In the figure, 1, a ceramic liner; 2. welding a joint; 3. backing a weld bead; 4. filling a weld bead; 5. and (7) surfacing welding.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments:
a method for resolving weld joint defects in production, comprising the steps of:
and S1, grinding the groove, wherein the angle of the welding groove is 40-50 degrees, and removing oil stain, rust, scale and other impurities in the groove and the width range of 20mm on the two sides of the groove before welding.
S2, as shown in figure 1, the groove is assembled and positioned, and the assembly gap of the root of the groove is 4-12 mm; as shown in fig. 2, the first end ceramic lining 1 is pasted on the back surface of the groove, the length of the ceramic lining adopted in the embodiment is 2m, the ceramic lining is pasted on the back surface of the groove by using an aluminum foil adhesive tape, the ceramic lining which is not opened is selected, and the ceramic lining exposed in the air for a long time cannot be used.
S3, backing welding the groove of the first section of the mounting ceramic liner, wherein the backing welding starts from one end of the ceramic liner and stops at the other end of the section of the ceramic liner, and a welding joint 2 is left at the stopping position; checking, after the shrinkage cavity defect that the backing weld produced polishes, post second section ceramic liner, carry out the backing weld to second section ceramic liner department, the starting point of backing weld is one end welded joint department along the one end of second section ceramic liner to other end, the terminal point is in the other end of second section ceramic liner, leave welded joint in the other end department of second section ceramic liner, the inspection, the shrinkage cavity defect that second section backing weld produced polishes, carry out the installation of third section ceramic liner again, so on, until satisfying welding length, as shown in fig. 2, the welding direction is as arrow head direction in fig. 2.
During backing welding, CO2 gas shielded welding is adopted, flux-cored wires approved by classification society and having a diameter of 1.4mm are selected as welding materials, the welding bead backing current is in a range of 175-230A, and the voltage is in a selectable range of 20-27 v.
And S4, after all backing welds are finished, performing filling welds on the basis of the backing welds, and then performing facing welds, wherein the welding groove comprises a backing weld bead 3, a filling weld bead 4 and a facing weld bead 5 in sequence from bottom to top as shown in figure 3.
In production, 100% nondestructive detection cannot be carried out on each welding line, but flaw detection can be carried out on the welding joint position which is easy to cause problems as long as the welding joint position is determined, if a liner full-pasting mode is adopted, the position where the welding joint stays cannot be determined clearly, and if appearance defects appear on the surface of the welding joint, effective treatment cannot be carried out in the first time, and the problem is effectively solved through the method provided by the invention.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (5)
1. A method for resolving weld joint defects in production, comprising the steps of:
s1, cleaning a welding groove before welding, wherein the angle of the welding groove is 40-50 degrees;
s2, leaving a gap at the bottom of the groove, pasting a first section of ceramic liner on the back of the welding groove, and pasting the ceramic liner in sections;
s3, performing backing welding, checking and polishing shrinkage cavity defects generated by the backing welding, and pasting a next section of ceramic liner to finish the next section of backing welding;
and S4, performing filling welding and cover surface welding after backing welding is completed.
2. The method for solving the defect of the welding joint in production according to claim 1, wherein in S2, the assembly clearance of the groove root is 4-12 mm.
3. The method for solving the defect of the welding joint in the production as claimed in claim 1, wherein in S3, after the welding at the first section of the ceramic liner is completed, the welding joint is left at the welding end of the first section of the ceramic liner.
4. The method as claimed in claim 1, wherein the backing welding current is 175-230A and the voltage is 20-27V in S3.
5. The method for solving the defect of the welding joint in the production as claimed in claim 1, wherein in S4, the filling welding is firstly carried out, and the cover surface welding is carried out after the filling welding is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018223.XA CN110883407A (en) | 2019-10-24 | 2019-10-24 | Method for solving welding joint defects in production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018223.XA CN110883407A (en) | 2019-10-24 | 2019-10-24 | Method for solving welding joint defects in production |
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| CN110883407A true CN110883407A (en) | 2020-03-17 |
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| CN201911018223.XA Pending CN110883407A (en) | 2019-10-24 | 2019-10-24 | Method for solving welding joint defects in production |
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