CN111037040B - Welding process for improving fatigue performance of metal yielding damper - Google Patents
Welding process for improving fatigue performance of metal yielding damper Download PDFInfo
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- CN111037040B CN111037040B CN201911414435.XA CN201911414435A CN111037040B CN 111037040 B CN111037040 B CN 111037040B CN 201911414435 A CN201911414435 A CN 201911414435A CN 111037040 B CN111037040 B CN 111037040B
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
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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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
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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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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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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- 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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- 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
- B23K9/32—Accessories
Abstract
The invention relates to consumable electrode argon arc welding and CO2The technical field of welding of gas shielded arc welding, in particular to a welding process for improving fatigue performance of a metal yielding damper. The welding process comprises the following steps: preparing before welding, preparing a corresponding V-shaped groove according to the thickness of a steel plate, wherein the angle of the groove is 45 degrees, and polishing the edge and the inner side of the groove smoothly; backing welding: performing tack welding assembly on each part by using gas shielded welding, wherein the prefabricated butt joint gap of a welding line is 2mm, and then completely welding the gap of the welding line; the process adopts gas shielded welding and pulse welding at the same time; angle robot welding: and welding the flange plate with a connecting plate, welding the energy consumption plate with the flange plate, welding the connecting plate with the energy consumption plate, welding the flange plate with the rib plate and welding the energy consumption plate with the rib plate. According to the invention, the damper is welded by the robot, the size of the structure crystal grain in the welding line is reduced, the hardening structure is avoided, the fatigue resistance of the damper is improved, the quality of the welding line is ensured, and the production efficiency can be greatly improved.
Description
Technical Field
The invention relates to the technical field of welding of consumable electrode argon arc welding and CO2 gas shielded arc welding, in particular to a welding process for improving fatigue performance of a metal yield damper.
Background
The metal yield damper can well improve the structural earthquake resistance, so the design of the metal yield damper in an earthquake-resistant structure is very important. Metal yield dampers rely on the inelastic plastic deformation of a metallic material (e.g., a low yield point steel, structural steel, or alloy) to dissipate energy from the earthquake. The metal yield damper has the advantages of simple structure, convenient manufacture, strong energy dissipation capability due to inelastic plastic deformation and lower manufacturing cost. At present, manual gas shielded welding is mainly adopted in the welding production of the metal yielding type damper, the automatic welding of a robot is rarely involved, the welding seam quality of each damper is difficult to be ensured to be the same because the level of each welding operator is different, the structure grain size in the welding seam is large, the structure is easy to harden, and the fatigue life of each metal damper can hardly meet the design requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a welding process for improving the fatigue performance of a metal yielding type damper, the size of structural crystal grains in a welding seam is reduced, a hardening structure is avoided, the fatigue resistance of the damper is improved, the quality of the welding seam is ensured, and the production efficiency is greatly improved.
The technical scheme of the invention is realized as follows: a welding process for improving fatigue performance of a metal yield damper comprises the following steps:
s1) pre-weld preparation: the connecting plate and the flange plate are made of Q355 low alloy steel, the rib plate is made of Q235 or Q355 low alloy steel, and the energy consumption plate is made of LY low carbon steel; preparing a corresponding V-shaped groove according to the thickness of the steel plate, wherein the angle of the groove is 45 degrees, and polishing the edge and the inner side of the groove smoothly;
s2) backing welding:
performing tack welding assembly on each part by using gas shielded welding, wherein the prefabricated butt joint gap of a welding line is 2mm, and then completely welding the gap of the welding line; the process adopts gas shielded welding and pulse welding at the same time, wherein the wire feeding speed of the gas shielded welding is 7.0m/min, the welding speed is 0.65m/min, the wire feeding speed of the pulse welding is 7.0m/min, and the welding speed is 0.7 m/min;
s3) angle joint robot welding:
welding flange plates on the left side and the right side with connecting plates at the upper end and the lower end, wherein the wire feeding speed of the robot is 3.5m/min, the welding speed is 0.5m/min, the left-right retention time is 0.5s, the length is 4mm, the deflection is 3mm, and the angle of a welding gun is 120 degrees;
the energy consumption plate is welded with the flange plates at the left side and the right side, the wire feeding speed of the robot is 2.5m/min, the welding speed is 0.5m/min, the left-right retention time is 0.1s, the length is 2.9mm, the deflection is 4.2mm, and the angle of a welding gun is 70 degrees;
welding the flange plates at the left side and the right side with the rib plate between the flange plates, wherein the wire feeding speed is 2.0m/min, the welding speed is 0.9m/min, the staying time from the upper edge to the edge is 0.35s, the staying time from the lower edge to the edge is 0.2s, the length is 2.5mm, and the deflection is 0.5 mm;
the connecting plates at the upper end and the lower end are welded with the energy consumption plate between the upper end and the lower end, the wire feeding speed is 2.5m/min, the welding speed is 0.4m/min, the staying time from the upper edge to the edge is 0.45s, the staying time from the lower edge to the edge is 0.25s, the length is 2.5mm, and the deflection is 0.5 mm.
In the bottoming welding and angle welding robot welding processes, inner root welding, hot welding, filling welding and cover surface welding are included, H08Mn2SiA welding wires are selected as welding materials, the diameter phi is 1.2mm, and the dry elongation of the welding wires is 15 mm.
In the step S2), when backing welding is performed, the welding current 278A between the energy consumption plate and the flange plate (3), voltage: 25.5V; welding current 278A of the flange plate and the connection plate, voltage: 27.6V.
The proportion of the protective gas in the gas shielded welding is 82% of Ar and 18% of CO2, the gas flow is 15L/min, and the protective gas is uniformly and stably fed into a welding area at an angle of 45 degrees with the welding direction.
And S2), backing welding, wherein when the process adopts pulse symmetric welding, the wire feeding speed is 5m/min, and the welding speed is 0.35 m/min.
And S3), in the welding process of the angle welding robot, the staying time at the welding seam terminal and the air supply time at the welding seam terminal are 0.8S.
The invention solves the defects in the background technology and has the following beneficial effects:
the welding process parameters for improving the fatigue performance of the metal yielding damper provided by the invention are simple and reasonable, and the penetration of the T-shaped welding line of the metal yielding damper is ensured by controlling the process parameters such as the wire feeding speed, the welding speed, the up-down to-side residence time and the like during welding by a robot; the heat input of the welding seam is controlled, so that the width of a heat affected zone is reduced, and the high-temperature retention time of the heat affected zone is controlled, so that the structure of the heat affected zone is not abnormally thick; the sectional shape of the weld is controlled to reduce stress concentration at the weld toe of the T-shaped weld, thereby improving the fatigue resistance of the metal yield damper. The invention adopts the angle welding robot for welding, ensures the welding seam strength, reduces the filling amount of deposited metal, adopts the all-position automatic welding process, improves the stability of the welding seam quality, automatically operates the whole process, and avoids the fluctuation influence of the traditional manual welding on the welding seam quality. Meanwhile, the welding speed can be obviously improved due to reasonable setting of welding parameters and interference of avoided human factors.
Drawings
FIG. 1 is a schematic view of a metal compliant damper;
FIG. 2 is a schematic view of a welded joint between a connecting plate and a flange plate;
FIG. 3 is a schematic view of a welding joint between a connecting plate and an energy dissipation plate;
in the figure: 1-connecting plate, 2-energy dissipation plate, 3-flange plate and 4-rib plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A welding process example 1 for improving fatigue performance of a metal yield damper as shown in fig. 1, 2 and 3, S1) preparation before welding: the connecting plate 1 is made of Q355 low alloy steel, and the size of a single block is 200 multiplied by 100 multiplied by 30 mm. The flange plate 3 is made of Q355 low alloy steel, the size of a single block is 200 multiplied by 100 multiplied by 12mm, the rib plate 4 is made of Q235 low alloy steel, the size of a single block is 100 multiplied by 40 multiplied by 8mm, and the energy consumption plate 2 is made of LY low carbon steel; preparing a corresponding V-shaped groove according to the thickness of the steel plate, wherein the angle of the groove is 45 degrees, and polishing the edge and the inner side of the groove smoothly; welding materials: h08Mn2SiA welding wires with the diameter phi of 1.2mm are selected. The proportion of the mixed gas is 82% of Ar and 18% of CO2, and the gas flow is 15L/min according to the selection.
S2) backing welding:
performing tack welding assembly on each part by using gas shielded welding, wherein the prefabricated butt joint gap of a welding line is 2mm, and then completely welding the gap of the welding line; the process adopts gas shielded welding and pulse welding at the same time, wherein the wire feeding speed of the gas shielded welding is 7.0m/min, the welding speed is 0.65m/min, the wire feeding speed of the pulse welding is 7.0m/min, and the welding speed is 0.7 m/min;
s3) angle joint robot welding:
the connecting plate 1 is welded with the flange plate 3 by an angle joint robot;
during bottoming, one-side gas shielded welding and one-side pulse welding are adopted, and the gas shielded welding parameters are as follows: wire feeding speed: 7m/min, welding speed: 0.65 m/min; welding current: 278 (A); voltage: 25.5 (V). Pulse welding parameters: wire feeding speed: 7.0m/min, welding speed: 0.7 m/min; welding current: 278 (A); voltage: 27.6 (V). The fillet weld position is changed into the ship-shaped welding position when the cover surface is covered, and the wire feeding speed of the robot is as follows: 3.5 m/min; welding speed: 0.5 m/min; the left and right retention time is 0.5 s; the length is 4mm, the deflection is 3mm, and the welding angle is 120 degrees.
The energy dissipation plate 2 is in angular connection with the flange plate 3 through a robot;
gas shielded welding is adopted during priming, and the parameters are as follows: wire feeding speed: 7 m/min; welding speed: 0.3 m/min; welding current: 278 (A); voltage: 25.5 (V). The fillet weld position is changed into the ship-shaped welding position when the cover surface is covered, and the wire feeding speed of the robot is as follows: 2.5m/min, robot speed: 0.5 m/min; the left retention time is 0.1s, and the right retention time is 0.1 s; deflection of 4.2mm, length of 2.9 mm; the welding angle was 70 °.
The energy consumption plate 2 is welded with the rib plate 4 in an angle joint robot;
the technological parameters are as follows: wire feed speed of the robot: 2.0 m/min; speed of the robot: 0.9 m/min; the residence time from the upper part to the side is 0.35s, and the residence time from the lower part to the side is 0.2 s; deflection 0.5mm and length 2.5 mm.
The flange plate 3 and the rib plate 4 are welded in an angle joint robot mode;
wire feed speed of the robot: 2m/min, robot speed: 0.9 m/min; the residence time from the upper part to the side is 0.35s, and the residence time from the lower part to the side is 0.2 s; the deflection is 0.5mm, the length is 2.5mm, and the welding gun angle is parallel to the bottom plate.
The connecting plate 1 is welded with the energy consumption plate 2;
the wire feeding speed is 2.5m/min, the welding speed is 0.4m/min, the residence time from the upper part to the edge is 0.45s, the residence time from the lower part to the edge is 0.25s, the length is 2.5mm, and the deflection is 0.5 mm. The residence time at the weld end and the air feed time at the weld end were 0.8 s.
Example 2
Different from the embodiment 1, in the backing welding in the step S2), the process adopts pulse symmetric welding with the wire feeding speed of 5m/min and the welding speed of 0.35 m/min.
When the staying time at the welding seam terminal and the air supply time at the welding seam terminal are 0.8s, and the filling metal at the tail part of the welding seam is moderate, the problem of crater cracks can be solved, and the welding strength is improved. During backing welding, gas shielded welding and pulse welding are carried out, and after welding, due to the effects of ambient air convection heat dissipation and self conduction heat dissipation of a welded steel plate, a welding area can generate a quenching effect, the size of structure grains in a welding line is reduced, and a hardening structure is avoided. The invention ensures the penetration welding of the T-shaped welding line of the metal yield damper by controlling the process parameters such as wire feeding speed, welding speed, up-down to-side retention time and the like during the welding of the robot; the heat input of the welding seam is controlled, so that the width of a heat affected zone is reduced, and the high-temperature retention time of the heat affected zone is controlled, so that the structure of the heat affected zone is not abnormally thick; the sectional shape of the weld is controlled to reduce stress concentration at the weld toe of the T-shaped weld, thereby improving the fatigue resistance of the metal yield damper. In addition, the invention adopts the angle welding robot for welding, ensures the welding seam strength, reduces the filling amount of the welding seam filling metal, adopts the all-position automatic welding process, improves the stability of the welding seam quality, automatically operates in the whole process, and avoids the fluctuation influence of the traditional manual welding on the welding seam quality. Meanwhile, due to reasonable setting of welding parameters and interference of avoided human factors, welding speed can be obviously improved, labor intensity of operators is reduced, requirements of enterprises on skilled worker operation skills are reduced, and construction cost is reduced. During welding, the proportion of (82% Ar + 18% CO2) is adopted in root welding, hot welding and cover welding mixed shielding gas, welding beads are filled, the tensile strength and the cold bending performance are improved, and the welding efficiency is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A welding process for improving fatigue performance of a metal yield damper is characterized by comprising the following steps:
s1) pre-weld preparation: the connecting plate (1) and the flange plate (3) are made of Q355 low alloy steel, the rib plate (4) is made of Q235 or Q355 low alloy steel, and the energy consumption plate (2) is made of LY low carbon steel; preparing a corresponding V-shaped groove according to the thickness of the steel plate, wherein the angle of the groove is 45 degrees, and polishing the edge and the inner side of the groove smoothly;
s2) backing welding:
performing tack welding assembly on each part by using gas shielded welding, wherein the prefabricated butt joint gap of a welding line is 2mm, and then completely welding the gap of the welding line; the process adopts gas shielded welding and pulse welding at the same time, wherein the wire feeding speed of the gas shielded welding is 7.0m/min, the welding speed is 0.65m/min, the wire feeding speed of the pulse welding is 7.0m/min, and the welding speed is 0.7 m/min;
s3) angle joint robot welding:
welding flange plates (3) on the left side and the right side with connecting plates (1) on the upper end and the lower end, wherein the wire feeding speed of a robot is 3.5m/min, the welding speed is 0.5m/min, the left-right retention time is 0.5s, the length is 4mm, the deflection is 3mm, and the welding gun angle is 120 degrees;
the energy consumption plate (2) is welded with the flange plates (3) at the left side and the right side, the wire feeding speed of the robot is 2.5m/min, the welding speed is 0.5m/min, the left and the right residence time is 0.1s, the length is 2.9mm, the deflection is 4.2mm, and the angle of a welding gun is 70 degrees;
welding of robot is received with gusset (4) angle to power consumption board (2), and the robot send a speed: 2.0m/min, and the welding speed is 0.9 m/min; the residence time from the upper part to the edge is 0.35s, the residence time from the lower part to the edge is 0.2s, the deflection is 0.5mm, and the length is 2.5 mm;
the flange plates (3) at the left side and the right side are welded with the rib plate (4) between the flange plates, the wire feeding speed is 2.0m/min, the welding speed is 0.9m/min, the staying time from the upper edge to the edge is 0.35s, the staying time from the lower edge to the edge is 0.2s, the length is 2.5mm, and the deflection is 0.5 mm;
the connecting plates (1) at the upper end and the lower end are welded with the energy consumption plate (2) between the upper end and the lower end, the wire feeding speed is 2.5m/min, the welding speed is 0.4m/min, the staying time from the upper edge to the edge is 0.45s, the staying time from the lower edge to the edge is 0.25s, the length is 2.5mm, and the deflection is 0.5 mm.
2. The welding process for improving the fatigue performance of the metal yield damper as claimed in claim 1, wherein: the proportion of the protective gas in the gas shielded welding is 82% of Ar and 18% of CO2, the gas flow is 15L/min, and the protective gas is uniformly and stably fed into a welding area at an angle of 45 degrees with the welding direction.
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