CN117564408A - Double-sided forming welding method for gapless single-sided welding - Google Patents
Double-sided forming welding method for gapless single-sided welding Download PDFInfo
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- CN117564408A CN117564408A CN202311624990.1A CN202311624990A CN117564408A CN 117564408 A CN117564408 A CN 117564408A CN 202311624990 A CN202311624990 A CN 202311624990A CN 117564408 A CN117564408 A CN 117564408A
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- 238000003466 welding Methods 0.000 title claims abstract description 254
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 17
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims abstract description 6
- 230000037452 priming Effects 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 19
- 239000000945 filler Substances 0.000 claims description 4
- 239000010953 base metal Substances 0.000 abstract description 26
- 230000007704 transition Effects 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005498 polishing Methods 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- B23K9/02—Seam welding; Backing means; Inserts
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a gapless single-sided welding double-sided forming welding method, which is used for flat angle welding of a first base metal and a second base metal, wherein a blade-shaped groove is arranged at the edge where the first base metal and the second base metal are connected, the first base metal and the second base metal are arranged at an angle, and the part to be connected of the groove and the second base metal is a welding position, and the welding method comprises the following steps: in the priming welding process, the arc of the welding gun is utilized to melt and puncture the edge part of the groove to form a melting hole, and in the swinging and advancing process of the welding gun, the arc blowing force is utilized to push the molten pool liquid metal to continuously fill the melting hole, so that the formed welding seam is fully fused with the first base metal and the second base metal. The invention adopts gapless welding, reduces shrinkage deformation after welding, and ensures the size and welding quality after welding; the welding forming is better, the welding seam at the back of the groove is in a smooth transition state, and the stress concentration degree is smaller.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a gapless single-sided welding double-sided forming welding method.
Background
At present, some large-sized vehicles, such as double-deck vehicles and the like, can set up the anticollision post at the both ends of wall door for improving the mechanical strength of vehicle, and this anticollision post is the rectangle box structure that is formed by C shaped steel and apron and supporting rib assembly welding, in the welding process that carries out C shaped steel and apron, in order to guarantee welding strength, all single face welding double-sided shaping needs to be guaranteed.
In the prior art, a large number of welding lines of T-shaped HV end connection are adopted for welding the anti-collision column, and a traditional welding operation mode is adopted, namely a welding line gap of 2-3mm is reserved between the C-shaped steel and the cover plate, and then welding is carried out. The welding method is easy to generate serious wave deformation after welding, cannot ensure the precision of the workpiece, and influences the installation and mechanical strength of the anti-collision column.
Summary of the invention
Therefore, the invention aims to provide a gapless single-sided welding double-sided forming welding method, so as to solve the problem that workpieces are easy to deform in the traditional welding process of welding seams.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the utility model provides a zero clearance single face welds two-sided shaping welding method for the flat angle welding of first parent metal and second parent metal, first parent metal with the edge that the second parent metal meets is provided with the edge form groove, just first parent metal with the second parent metal is the angle setting, groove with the position of waiting to connect of second parent metal is the welding position, the welding method includes the following steps:
in the backing welding process, an arc is obtained by using a welding gun to melt and puncture the edge part of the groove to form a melting hole, and in the swinging and advancing process of the welding gun, the melting hole is continuously filled with molten pool liquid metal by using the blowing force of the arc to enable the formed welding seam to be fully fused with the first base metal and the second base metal.
Further, in the welding process, the axis position of arc swing is deviated to the position of the second parent metal 1mm-3mm away from the welding position; preferably 2mm.
Further, when the molten pool liquid metal is pushed by the arc blowing force to fill the molten hole, the filling size is one third of the molten hole.
Further, the size of the smelting hole is 4-6mm.
Further, the right welding method is adopted in the welding direction; in the welding process, the welding gun forms an included angle of 50-70 degrees with the welding direction; preferably 60 degrees.
Further, welding is carried out by adopting an oblique saw-tooth welding operation method; in the welding process, the welding gun swings backwards and obliquely by 45 degrees.
Further, the gapless single-sided welding double-sided molding welding method further comprises the steps of welding the filling layer: the filling layer forms a concave weld joint with the side edges of the first base material and the second base material.
Further, the gapless single-sided welding double-sided molding welding method further comprises the steps of welding the cover layer: the cover layer covers the concave weld seam.
Compared with the prior art, the gapless single-sided welding double-sided forming welding method provided by the invention has the following advantages:
(1) The gapless single-sided welding double-sided forming welding method provided by the invention adopts gapless welding, reduces shrinkage deformation after welding, and ensures the size and welding quality after welding.
(2) The gapless single-sided welding double-sided forming welding method provided by the invention has the advantages that the welding forming is better, the welding seam at the back of the groove is in a smooth transition state, the stress concentration degree is smaller, a great amount of time for polishing and trimming the welding seam later is saved, and the production efficiency is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of the positions of a first base material and a second base material in a gapless single-sided welding double-sided forming welding method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a backing layer welding operation mode of a gapless single-sided welding double-sided forming welding method according to an embodiment of the invention;
FIG. 3 is a schematic view of the position structure of a backing layer of a gapless single-sided welding double-sided forming welding method according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a filler layer welding operation mode of a gapless single-sided welding double-sided forming welding method according to an embodiment of the invention;
FIG. 5 is a schematic diagram of the position structure of a filling layer of a gapless single-sided welding double-sided forming welding method according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a welding operation mode of a cover layer of a gapless single-sided welding double-sided molding welding method according to an embodiment of the invention;
fig. 7 is a schematic diagram of a cover layer position structure of a gapless single-sided welding double-sided forming welding method according to an embodiment of the invention.
Reference numerals illustrate:
1-a first parent material; 2-a second parent material; 3-groove; 4-welding position; 5-the back of the groove; 6-welding gun; 7-welding wires; 10-priming; 20-a filling layer; 30-cover layer.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The gapless single-sided welding double-sided forming welding method provided by the embodiment is used for flat angle welding of a first base metal 1 and a second base metal 2, a blade-shaped groove 3 is arranged at the edge where the first base metal 1 is connected with the second base metal 2, the first base metal 1 and the second base metal 2 are arranged in an angle, the part to be connected between the groove 3 and the second base metal 2 is a welding position 4, and the welding method comprises the following steps:
in the welding process of the priming layer 10, the arc of the welding gun 6 is utilized to melt and puncture the edge part of the groove 3 to form a melting hole, and in the swinging forward process of the welding gun 6, the arc blowing force is utilized to push the molten pool liquid metal to continuously fill the melting hole, so that the formed welding seam is fully fused with the first base metal 1 and the second base metal 2.
The gapless single-sided welding double-sided forming welding method provided by the embodiment adopts gapless welding, reduces shrinkage deformation after welding, and ensures the size and welding quality after welding; the molten pool liquid metal permeates into the groove back surface 5 through the melting hole and is fully fused with the two sides of the welding position 4, so that the welding forming is good, and the welding strength is high; the welding seam of the groove back surface 5 is in a smooth transition state, the stress concentration degree is small, and meanwhile, a large amount of time for polishing and trimming the welding seam later is saved, so that the production efficiency is further improved.
Preferably, the method is suitable for a gapless single-sided welding double-sided forming welding operation of the first base material 1 and the second base material 2 of 3mm and above.
The following description will describe the welding method in detail with reference to a welding example of the bumper post:
in the welding of the collision post, the C-shaped steel corresponds to the first base metal 1, the cover plate corresponds to the second base metal 2, the first base metal 1 and the second base metal 2 are each 10mm thick, the groove 3 is located on the outer side surface of the edge where the C-shaped steel meets the cover plate, and the collision post fixes the cover plate to the opening surface of the C-shaped steel by welding.
This example uses MAG welding (consumable electrode active gas shielded arc welding, abbreviated as gas shielded welding) in combination with MAG solid wire 7 for welding, generally comprising 2G position (flat angle welding position 4) backing welding +1G position (flat welding position) filler cap welding.
1. Selection of welding parameters
The diameter of the welding wire 7 is 1.2mm, and the gas component is 82 percent Ar+18 percent CO 2 The gas flow is 14-18L/min. The welder was a Funies TPS5000 with a rated current of 500A.
2. Pre-weld preparation
Before welding, removing greasy dirt, rust and the like within the range of 30mm on two sides of the welding position 4 of the first base material 1 and the second base material 2, and polishing until the surface is exposed with metallic luster. The polishing groove 3 is in a blade shape, the angle of the groove 3 is larger than 45 degrees, and preferably, the angle of the groove 3 is 50 degrees. And then carrying out spot welding before spot welding, wherein the gap between the first base metal 1 and the second base metal 2 after the spot welding is 0mm.
3. Welding of the primer layer 10
The welding direction adopts a right welding method. The welding mode is unified direct current welding, the molten drop transition mode is jet flow transition, the welding current is 280A-300A, the welding voltage is 27.9-29.4V, and the welding position 4 is 2G. The welder arc current, i.e., I-S, was set to 135%. When the arc is started by adopting 135% of welding arc starting current, the angle of the welding gun 6 is 60 degrees with the welding direction, an included angle larger than 45 degrees is formed between the welding gun 6 and the second parent metal 2, preferably 50 degrees, the welding wire 7 points to a position, which is 1-3mm, preferably 2mm away from the root of the welding seam, of the second parent metal 2, and the welding wire cannot point to the welding position 4 and the groove 3. After arcing, the switch is held by hand and is not loosened, at the moment, the welding current is larger, the edge of the groove 3 is instantaneously melted and broken into a melting hole, the size of the melting hole is 4-6mm, at the moment, the switch of the welding gun 6 is immediately loosened, and the welding is carried out by using the welding current.
In order to reduce the operation difficulty, prevent burning through and improve the qualification rate of welding seams, the welding is performed by adopting a welding operation method in an inclined zigzag shape, and the welding speed is 7mm/s-9mm/s. During welding, the angle of the welding gun 6 is 60 degrees relative to the welding direction, so that on one hand, a welder can observe the state of a molten pool conveniently, and on the other hand, the welder can operate conveniently under the condition of ensuring good gas protection effect; meanwhile, the swinging axis position of the welding gun 6 is deviated to the position of the second parent metal 2 which is 1mm-3mm away from the welding position 4, namely, the formed welding seam central line is positioned at the position of the second parent metal 2 which is 1mm-3mm away from the welding position 4, preferably 2mm, and the welding gun 6 swings to the side of the second parent metal 2 by 5mm and swings to the side of the groove 3 by 1mm, and an included angle which is larger than 45 degrees is formed between the welding gun 6 and the second parent metal 2, so that most of arc heat is conducted to the second parent metal 2, and the groove 3 is prevented from burning through.
And during welding, the state of the molten holes is controlled at all times, and the sizes of the molten holes are controlled to be consistent. The welding gun 6 is pulled forwards, the groove 3 is continuously melted into a new melting hole, most of electric arc (accounting for about 98 percent of the total area of the electric arc) is observed, and when the electric arc passes out of the melting hole along the second parent metal 2, the back surface 5 of the groove is melted; and then swinging backwards by 45 degrees, namely filling a previous melting hole by molten pool liquid metal until the molten pool liquid metal permeates into the groove back surface 5, wherein the filling size is one third of the melting hole, namely, two thirds of electric arcs act on the welding line, one third of electric arcs penetrate out of the melting hole along the second parent metal 2, so that the welding line at the previous position is fused, and welding can be continued, thereby reciprocating.
It should be noted that this step must be operated at a fast rate to prevent the already formed weld from burning through. The arc cutting cannot be directly directed to the welding position 4 and the groove 3, so that the welding is easy to pass through and the repair is difficult. Meanwhile, the welding of the priming layer 10 must be ensured to continue to weld after the molten holes are formed, and the unqualified post-welding detection can be caused by the fact that the molten holes are not formed or are too large or too small.
4. Welding of the filler layer 20
The left welding method is adopted for welding, the welding mode is unified pulse welding, and the molten drop transition mode is pulse transition. The welding current is 200A-220A, and the welding voltage is 23.8V-25.8V. The welding position 4 is a 1G position. The angle of the welding gun 6 is 90 degrees with the welding direction longitudinally and 90 degrees with the welding position 4 transversely. The welding mode of drawing a large circle is adopted, and the two sides are slightly stopped for 0.5-1 second so as to form a concave welding seam, ensure good fusion, ensure that the filling layer 20 is about 0.5mm away from the outer side surface of the groove 3, and prepare for welding the cover layer 30. The welding speed is 6mm/s-7mm/s.
5. Welding of the cover layer 30
The left welding method is adopted for welding, the welding mode is unified pulse welding, and the molten drop transition mode is pulse transition. The welding current is 180A-200A, and the welding voltage is 22.6-23.8V. And during cover surface welding, adopting a 1G position for welding. The angle of the welding gun 6 is 90 degrees with the welding direction longitudinally and 90 degrees with the welding position 4 transversely. The zigzag welding operation method is adopted, and the outer side surface of the molten groove 3 of the molten pool is controlled to be 3mm, so that good weld joint forming is ensured. The welding speed is 6mm/s-7mm/s.
The gapless single-sided welding double-sided forming welding method provided by the embodiment not only can reduce the deformation of the welding piece and the stress at the welding seam, but also adopts a mode of combining jet transition and pulse transition for welding, so that the splashing in the welding process is less, the penetration of the welding seam is large, and the welding quality is good; and the welding mode of 2G+1G is adopted, so that the operation difficulty and the working strength of technical workers can be reduced, the welding quality can be guaranteed, and the working efficiency can be improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. A gapless single-sided welding double-sided forming welding method is used for flat angle welding of a first base material (1) and a second base material (2), and is characterized in that: the welding method comprises the following steps that a blade-shaped groove (3) is formed in the edge of the first base material (1) connected with the second base material (2), the first base material (1) and the second base material (2) are arranged in an angle mode, a part to be connected of the groove (3) and the second base material (2) is a welding position (4), and the welding method comprises the following steps:
in the welding process of the priming layer (10), the arc of the welding gun (6) is utilized to melt and break down the edge part of the groove (3) to form a melting hole, and in the swinging forward moving process of the welding gun (6), the arc blowing force is utilized to push the molten pool liquid metal to continuously fill the melting hole, so that the formed welding seam is fully fused with the first base material (1) and the second base material (2).
2. The gapless single-sided welding double-sided forming welding method of claim 1, wherein: in the welding process, the axis position of arc swing is deviated to the position of the second parent metal (2) which is 1mm-3mm away from the welding position (4).
3. The gapless single-sided welding double-sided forming welding method of claim 1, wherein: when the arc blowing force is utilized to push molten pool liquid metal to fill the melting hole, the filling size is one third of the melting hole.
4. The gapless single-sided welding double-sided forming welding method of claim 1, wherein: the size of the melting hole is 4-6mm.
5. The gapless single-sided welding double-sided forming welding method of claim 1, wherein: the welding direction adopts a right welding method; in the welding process, the welding gun (6) forms an included angle of 50-70 degrees with the welding direction.
6. The gapless single-sided welding double-sided forming welding method of claim 1, wherein: welding by adopting an oblique zigzag welding operation method; in the welding process, the welding gun (6) swings backwards and obliquely by 45 degrees.
7. The gapless single-sided welding double-sided forming welding method of claim 1, wherein: further comprising welding of the filler layer (20): the filling layer (20) forms a concave weld joint with the side edges of the first parent metal (1) and the second parent metal (2).
8. The gapless single-sided welding double-sided forming welding method of claim 7, wherein:
further comprising welding of the cover sheet (30): the cover layer (30) overlies the female weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311624990.1A CN117564408A (en) | 2023-11-30 | 2023-11-30 | Double-sided forming welding method for gapless single-sided welding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311624990.1A CN117564408A (en) | 2023-11-30 | 2023-11-30 | Double-sided forming welding method for gapless single-sided welding |
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| CN117564408A true CN117564408A (en) | 2024-02-20 |
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| CN202311624990.1A Pending CN117564408A (en) | 2023-11-30 | 2023-11-30 | Double-sided forming welding method for gapless single-sided welding |
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| CN (1) | CN117564408A (en) |
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2023
- 2023-11-30 CN CN202311624990.1A patent/CN117564408A/en active Pending
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