CN110666290A - Full penetration welding method for U-shaped rib angle welding seam - Google Patents
Full penetration welding method for U-shaped rib angle welding seam Download PDFInfo
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- CN110666290A CN110666290A CN201911033687.8A CN201911033687A CN110666290A CN 110666290 A CN110666290 A CN 110666290A CN 201911033687 A CN201911033687 A CN 201911033687A CN 110666290 A CN110666290 A CN 110666290A
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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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
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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
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Abstract
The invention provides a full penetration welding method for a U-shaped rib fillet weld, which comprises the steps of firstly welding an inner fillet weld and then welding an outer fillet weld; the inner side angle welding seam welding adopts flat angle position welding, and a welding gun forms an included angle of 40 degrees with the horizontal plane; the outer side angle welding seam welding adopts two-ship position welding, the first ship position welding is carried out, the included angle between a welding gun and the panel is 25-35 degrees, the forward inclination angle is 10 degrees, the second ship position welding is carried out, and the included angle between the welding gun and the panel is 50-55 degrees. According to the invention, the inner side fillet weld is welded at the flat angle position, the outer side fillet weld is welded at the ship position, and the inner side fillet weld provides a support for the outer side fillet weld, so that penetration is realized and welding leakage is avoided; due to the special arrangement of the welding angle, the outer side fillet weld and the inner side fillet weld can be conveniently lapped, penetration is realized, the problems of slag inclusion, undercut or welding leakage can be avoided, the good appearance of the weld can be ensured, and the quality of the weld can be improved.
Description
Technical Field
The invention belongs to the technical field of bridge steel structure welding, and particularly relates to a full penetration welding method for a U-shaped rib angle welding seam.
Background
The orthotropic U-shaped rib plate unit is generally applied to the field of bridge steel structures due to the characteristics of light weight and good bearing capacity; however, the U-shaped rib plate units are easy to generate fatigue cracks, and are main factors influencing the service life and the safety of the bridge steel structure.
The traditional U-shaped rib angle welding seam adopts single-side welding and partial penetration welding. Because the weld root is not melted through and the penetration depth of different parts is different, the weld root has larger stress concentration and is the most prominent part of the fatigue crack phenomenon. Therefore, the research on the technological method for realizing the full penetration welding of the U-rib fillet weld is one of the approaches for solving the problem of root fatigue.
Disclosure of Invention
Aiming at the problems, the invention provides a full penetration welding method for a U-shaped rib angle welding seam, which realizes full penetration welding of the U-shaped rib angle welding seam in a back chipping-free state.
A full penetration welding method for a U-shaped rib fillet weld comprises the steps of firstly welding an inner fillet weld and then welding an outer fillet weld; the inner side angle welding seam welding adopts flat angle position welding, and a welding gun forms an included angle of 40 degrees with the horizontal plane; the outer side angle welding seam welding adopts two-channel ship position welding, the first ship position welding, the welding gun and the panel form an included angle of 25-35 degrees, the forward inclination angle is 10 degrees, the second ship position welding, and the welding gun and the panel form an included angle of 50-55 degrees.
Preferably, the groove angle of the U-shaped rib fillet weld is 52-55 degrees, the truncated edge of the groove is 1.5-2.5mm, and the gap between the root and the panel is controlled within 1 mm.
Preferably, the fillet weld at the inner side of the U-shaped rib adopts argon-rich gas shielded welding, the welding wire is ER50-6, the diameter is 1.2mm, and the distance between the welding wire and the root of the U-shaped rib is 0-1.2 mm; the welding specification parameters are current 300-340A, arc voltage 31-35V and welding speed 38-42 cm/min.
Preferably, the first ship position welding of the fillet weld at the outer side of the U-shaped rib is carried out, and the welding specification parameters comprise current 320-380A, arc voltage 33-36V, welding speed 50-60cm/min, swing amplitude 2mm, swing frequency 180 times/min and CO2 gas flow 20-25L/min.
Preferably, the fillet weld on the outer side of the U-shaped rib is welded for the second time, and the welding specification parameters are current 320-350A, arc voltage 35-39V, welding speed 35-45cm/min, swing amplitude 5mm, swing frequency 120 times/min and CO2 protective gas flow 20-25L/min.
Preferably, the fillet weld at the outer side of the U-shaped rib is subjected to swing welding by a welding robot with an arc tracking function, the position of the weld is accurately tracked, and the swing amplitude and frequency are controllable during welding; flux-cored wire CO2 gas shielded welding is adopted, the grade of the welding wire is GFL-70C, and the diameter is 1.4 mm.
The invention has the beneficial effects that: 1. welding an inner fillet weld at a flat angle position, welding an outer fillet weld at a ship position, and providing a support for the outer fillet weld by using an inner fillet weld, so that penetration is realized and welding leakage is avoided; 2. the inner fillet weld is welded at the flat angle position by adopting specific process parameters, so that the inner weld is well formed and has certain penetration, and the overlapping of the outer fillet weld and the inner fillet weld is facilitated, thereby facilitating the penetration welding; 3. the outer groove fillet weld is welded by adopting a specific process parameter ship position, the specific process parameter of the first weld is convenient for the overlap joint of the outer fillet weld and the inner fillet weld, so that the penetration is realized, the problems of slag inclusion, undercut or welding leakage and the like are avoided, the specific process parameter of the second weld ensures that the appearance of the weld is well formed, and the weld quality is improved.
Drawings
FIG. 1 is a schematic view of the assembly of a U-shaped rib with a panel;
FIG. 2 is a schematic diagram of the groove milling structure on two sides of a U-shaped rib;
FIG. 3 is a schematic view of fillet weld welding;
FIG. 4 is a schematic view of a first outer fillet weld;
FIG. 5 is a schematic view of the rake angle;
FIG. 6 is a second schematic view of an outer fillet weld;
FIG. 7 is an exemplary effect graph of welding;
FIG. 8 is a first problem welding effect diagram;
FIG. 9 is a second problem welding effect diagram;
fig. 10 is a third view of the welding effect of the problem.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Example 1
A full penetration welding method for a U-shaped rib fillet weld comprises the following steps:
1. assembling the U-shaped rib and the panel, as shown in figure 1, wherein the two sides of the U-shaped rib are milled to form a groove, the angle alpha of the groove is controlled to be 52-55 degrees, the blunt edge P is controlled to be 1.5-2.5mm, and the gap b between the root and the panel is controlled to be within 1mm, as shown in figure 2. The truncated edge size is less than 1.5mm, so that welding leakage is easy, and the truncated edge size is more than 2.5mm, so that fusion penetration is difficult.
2. An inner corner weld joint welding arm extends into the inner side of a U-shaped rib to weld an inner side corner weld joint, the inner side corner weld joint welding adopts flat corner position welding, as shown in figure 3, an included angle beta between a welding gun and a panel is controlled to be 40-45 degrees, argon-rich gas shielded welding of 85% Ar +15% CO2 is adopted, a welding wire is ER50-6, the diameter is 1.2mm, the distance L between the welding wire and the root of the U-shaped rib is controlled to be 0-1.2mm, welding standard parameters are current 300 and 340A, arc voltage is 31-35V, welding speed is 38-42cm/min, shielding gas adopts the proportion of 85% Ar +15% CO2, certain penetration is guaranteed under the condition that splashing is small, the included angle beta between the welding gun and the panel is controlled to be 40-45 degrees, the position near a center line deviates to the panel, welding seam forming is guaranteed, meanwhile, the penetration is beneficial to improving, the distance L between the welding wire and the root of the U-shaped rib is controlled to be 0-1.2mm, side biting of the U-shaped rib is avoided, the welding current 300 ~ 340A is smaller than the range, the splashing speed is larger than.
3. After the inner angle welding seam is welded, transferring the plate unit to an anti-deformation jig frame of a welding robot, presetting an anti-surface shape and turning to a 38-degree ship position;
4. performing first outer corner welding seam welding by the welding robot, and controlling an included angle theta 1 between a welding gun and a panel to be 25-35 degrees and a forward inclination angle theta 2 to be 10 degrees as shown in figures 4 and 5; the welding specification parameters are current 320-380A, arc voltage 33-36V, welding speed 50-60cm/min, swing amplitude 2mm, swing frequency 180 times/min and CO2 gas flow 20-25L/min. The included angle theta 1 and the anteversion angle theta 2 between the welding gun and the panel are as small as possible within the range of equipment capacity, so that the fusion penetration is facilitated; the welding current 320-380A is larger than the conventional selection, so that the penetration is facilitated, the welding leakage is easy to occur when the range is exceeded, and the arc voltage and the welding speed are matched with the welding current, so that the better fusion depth is obtained; the swing amplitude is matched with the groove size, the swing frequency is matched with the swing amplitude, and good weld appearance is obtained.
5. Performing second outer corner welding seam welding by the welding robot, and controlling an included angle theta 3 between the welding gun and the panel to be 50-55 degrees as shown in fig. 6; the welding specification parameters are current 320-350A, arc voltage 35-39V, welding speed 35-45cm/min, swing amplitude 5mm, swing frequency 120 times/min and CO2 protective gas flow 20-25L/min. The welding current 320-350A is matched with the welding current of the first outer side fillet weld, the groove can be filled, welding materials cannot be wasted due to overlarge welding angles, the arc voltage and the welding speed are matched with the welding current, and good welding line appearance is obtained; an included angle theta 3 between the welding gun and the panel is controlled to be 50-55 degrees, and the center of the welding gun slightly deviates from a U-shaped rib, so that good welding seam appearance is obtained; the swing amplitude is matched with the required width of the welding seam, and the swing frequency is matched with the swing amplitude.
In the step 4 and the step 5, the U-shaped rib outer side fillet weld is subjected to swing welding by adopting a welding robot with an arc tracking function, the position of the weld is accurately tracked, and the swing amplitude and frequency are controllable during welding; flux-cored wire CO2 gas shielded welding is adopted, the grade of the welding wire is GFL-70C, and the diameter is 1.4 mm.
According to the invention, the inner side fillet weld is welded at the flat angle position, the outer side fillet weld is welded at the ship position, and the inner side fillet weld provides a support for the outer side fillet weld, so that penetration is realized and welding leakage is avoided. Due to the special arrangement of the welding angle, the outer side fillet weld and the inner side fillet weld can be conveniently lapped, penetration is realized, the problems of slag inclusion, undercut or welding leakage defects and the like can be avoided, the good appearance of the weld is ensured, and the quality of the weld is improved; the specific welding specification parameters are used for assisting in matching, and the overlapping and penetration effects of the inner and outer side fillet welds are better achieved.
Specific examples are described below:
① inside corner welding, adopting argon-rich gas shielded welding of 85% Ar +15% CO2, welding wire ER50-6 with diameter of 1.2mm, welding gun included angle beta =42 degree with panel, welding wire distance L =0.8mm with U-shaped rib root, welding current 320A, welding voltage 33V and welding speed 40 cm/min.
② welding the outer side fillet weld on the first ship position, wherein the welding current is 350A, the arc voltage is 34V, the welding speed is 55cm/min, the included angle between a welding gun and a panel is theta 1=30 degrees, the forward rake angle is theta 2=10 degrees, the swing amplitude is 2mm, the swing frequency is 180 times/min, and the CO2 gas flow is 20-25L/min.
③ welding the fillet weld on the outer side of the second ship position, wherein the welding current is 330A, the arc voltage is 37V, the welding speed is 40cm/min, the included angle theta 3=52 degrees between a welding gun and a panel, the swing amplitude is 5mm, the swing frequency is 120 times/min, and the CO2 gas flow is 20-25L/min.
Exemplary U-rib weld results As shown in FIG. 7, it can be seen that the root penetration is good and the weld appearance is good. Welding effect fig. 8 corresponds to the problem that the root is not melted through if the truncated edge is too large (3 mm); the outside fillet weld is only welded for 1 time, the surface convexity of the weld is too large, and the appearance forming is not good. Welding effect fig. 9 corresponds to the problem that the root is not melted through if the truncated edge is too large (3 mm); the first welding of the outside fillet weld is not provided with a front rake, the penetration is small, the second welding voltage of the outside fillet weld is too small (34V), the speed is too high (50 cm/min), and the appearance forming of the weld is poor. Welding effect fig. 10 corresponds to the problem that the first welding of the outside fillet weld does not have a forward rake angle and is not completely melted through, the second welding gun of the outside fillet weld has an excessively large angle with the panel, and the appearance of the weld is not formed well.
According to the orthotropic U-shaped rib plate unit of the exemplary welding, through the detection of a relevant mechanism, the welding hardness is 200-; the root is fully melted through.
Finally, it should also be noted that the above list is only one specific embodiment of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (6)
1. A full penetration welding method for a U-shaped rib fillet weld is characterized in that an inner fillet weld is welded firstly, and then an outer fillet weld is welded; the inner side angle welding seam welding adopts flat angle position welding, and a welding gun forms an included angle of 40 degrees with the horizontal plane; the outer side angle welding seam welding adopts two-ship position welding, the first ship position welding is carried out, the included angle between a welding gun and the panel is 25-35 degrees, the forward inclination angle is 10 degrees, the second ship position welding is carried out, and the included angle between the welding gun and the panel is 50-55 degrees.
2. The full penetration welding method of the U-shaped rib fillet weld according to claim 1, characterized in that the groove angle of the U-shaped rib fillet weld is 52-55 degrees, the groove truncated edge is 1.5-2.5mm, and the gap between the root and the panel is controlled within 1 mm.
3. The full penetration welding method of the U-shaped rib fillet weld according to claim 2, characterized in that the fillet weld at the inner side of the U-shaped rib adopts argon-rich gas shielded welding, the welding wire is ER50-6, the diameter is 1.2mm, and the distance between the welding wire and the root of the U-shaped rib is 0-1.2 mm; the welding specification parameters are current 300-340A, arc voltage 31-35V and welding speed 38-42 cm/min.
4. The full penetration welding method for the U-shaped rib fillet weld according to claim 2, characterized in that the first ship position welding of the U-shaped rib outside fillet weld is carried out, and the welding specification parameters are current 320-380A, arc voltage 33-36V, welding speed 50-60cm/min, swing amplitude 2mm, swing frequency 180 times/min and CO2 gas flow 20-25L/min.
5. The full penetration welding method for the U-shaped rib fillet weld according to claim 2, characterized in that the fillet weld on the outer side of the U-shaped rib is welded for the second time, and the welding specification parameters are current 320-350A, arc voltage 35-39V, welding speed 35-45cm/min, swing amplitude 5mm, swing frequency 120 times/min and CO2 protective gas flow 20-25L/min.
6. The full penetration welding method of the U-shaped rib fillet weld according to the claim 4 or 5, characterized in that the fillet weld outside the U-shaped rib adopts a welding robot with an arc tracking function to carry out swing welding, the position of the weld joint is accurately tracked, and the swing amplitude and frequency are controllable during welding; flux-cored wire CO2 gas shielded welding is adopted, the grade of the welding wire is GFL-70C, and the diameter is 1.4 mm.
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| CN201911033687.8A CN110666290A (en) | 2019-10-28 | 2019-10-28 | Full penetration welding method for U-shaped rib angle welding seam |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111570971A (en) * | 2020-05-28 | 2020-08-25 | 上海外高桥造船有限公司 | Welding method for full penetration fillet weld of bulkhead lower pier and double-layer bottom high-stress area |
| CN112589235A (en) * | 2020-12-01 | 2021-04-02 | 中铁宝桥（扬州）有限公司 | U-rib bilateral double-arc synchronous asymmetric penetration welding process |
| CN113145992A (en) * | 2021-04-22 | 2021-07-23 | 中铁九桥工程有限公司 | Full penetration welding process method for U-rib embedding section |
| CN114800287A (en) * | 2022-06-29 | 2022-07-29 | 中铁山桥集团有限公司 | Automatic rust cleaning system that polishes of two sides of U rib |
| CN117020367A (en) * | 2023-10-08 | 2023-11-10 | 中国航发沈阳黎明航空发动机有限责任公司 | Welding device and welding method for titanium alloy supporting ring of engine tail nozzle |
| CN117464134A (en) * | 2023-12-26 | 2024-01-30 | 中铁四局集团有限公司 | Streamline flat steel box girder welding equipment and processing method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111570971A (en) * | 2020-05-28 | 2020-08-25 | 上海外高桥造船有限公司 | Welding method for full penetration fillet weld of bulkhead lower pier and double-layer bottom high-stress area |
| CN112589235A (en) * | 2020-12-01 | 2021-04-02 | 中铁宝桥（扬州）有限公司 | U-rib bilateral double-arc synchronous asymmetric penetration welding process |
| CN113145992A (en) * | 2021-04-22 | 2021-07-23 | 中铁九桥工程有限公司 | Full penetration welding process method for U-rib embedding section |
| CN113145992B (en) * | 2021-04-22 | 2022-08-09 | 中铁九桥工程有限公司 | Full penetration welding process method for U-rib embedding section |
| CN114800287A (en) * | 2022-06-29 | 2022-07-29 | 中铁山桥集团有限公司 | Automatic rust cleaning system that polishes of two sides of U rib |
| CN114800287B (en) * | 2022-06-29 | 2022-11-04 | 中铁山桥集团有限公司 | Automatic rust cleaning system that polishes of two sides of U rib |
| CN117020367A (en) * | 2023-10-08 | 2023-11-10 | 中国航发沈阳黎明航空发动机有限责任公司 | Welding device and welding method for titanium alloy supporting ring of engine tail nozzle |
| CN117464134A (en) * | 2023-12-26 | 2024-01-30 | 中铁四局集团有限公司 | Streamline flat steel box girder welding equipment and processing method thereof |
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Application publication date: 20200110 |