CN115351396A - Welding method for improving plane bending fatigue performance of lap joint - Google Patents
Welding method for improving plane bending fatigue performance of lap joint Download PDFInfo
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- CN115351396A CN115351396A CN202211012428.9A CN202211012428A CN115351396A CN 115351396 A CN115351396 A CN 115351396A CN 202211012428 A CN202211012428 A CN 202211012428A CN 115351396 A CN115351396 A CN 115351396A
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- welding
- bending fatigue
- plane bending
- improving
- weld
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- 238000003466 welding Methods 0.000 title claims abstract description 187
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005452 bending Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims description 15
- 241000375392 Tana Species 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 5
- 238000009661 fatigue test Methods 0.000 description 16
- 230000008021 deposition Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003068 static effect Effects 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
- B23K9/16—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
- B23K9/32—Accessories
Abstract
The invention relates to the technical field of welding of steel materials, and discloses a welding method for improving the plane bending fatigue performance of an overlap joint, aiming at low-alloy high-strength steel with the 2-8 mm specification tensile strength of 370-660 MPa, a lap plate and a bottom plate which are the same in thickness form a fillet weld, and a consumable electrode gas shielded welding method is adopted to control the shape and the size of the fillet weld, form a concave weld and realize one-step forming of the fillet weld. The welding method for improving the plane bending fatigue performance of the lap joint is simple and easy to implement, does not need postweld heat treatment, can effectively improve the plane bending fatigue resistance of the lap fillet weld, and improves the overall safety of the structure.
Description
Technical Field
The invention relates to the technical field of welding of steel materials, in particular to a welding method for improving the plane bending fatigue performance of an overlap joint.
Background
An effective way for improving the energy utilization efficiency of vehicles, whether fuel-fired vehicles or new energy electric vehicles, is to reduce the weight of the vehicle body. The material for the chassis is particularly important in the light weight design of the automobile, and the basic idea at present is to replace the traditional carbon steel by high-strength steel.
In vehicle design, light weight and safety must be considered, chassis parts are important components for ensuring vehicle safety, and good static load performance and excellent fatigue resistance are required.
Gas metal arc welding is the primary joining process in vehicle chassis manufacturing, and extensive research has shown that the weld joint is a weak point in the overall structure in fatigue failure. Therefore, it is very critical to improve the fatigue resistance of the welded joint. While experimental studies have shown that lap fillet fatigue resistance is the weakest in all welded joint forms.
The lap joint welding joint is quite common in a vehicle chassis welding structure, and the welding joint is the welding joint with the weakest fatigue resistance, so that how to effectively improve the fatigue resistance of the lap joint welding joint has important significance for improving the safety of the whole chassis.
Disclosure of Invention
The invention aims to provide a welding method for improving the plane bending fatigue performance of an overlap joint aiming at the defects of the technology, which is simple and feasible, does not need postweld heat treatment, can effectively improve the plane bending fatigue resistance of an overlap fillet weld, and improves the overall safety of a structure.
In order to achieve the purpose, the welding method for improving the plane bending fatigue performance of the lap joint is designed, aiming at low-alloy high-strength steel with the 2-8 mm specification tensile strength of 370-660 MPa, a lap plate with the same plate thickness and a bottom plate form a fillet weld, and the shape and the size of the fillet weld are controlled by adopting a gas metal arc welding method to form a concave weld, so that the one-step forming of the fillet weld is realized.
Preferably, the lapping plate and the bottom plate are lapped and assembled without gaps, and the lapping amount is controlled to be 15-20 mm.
Preferably, during welding, the welding trolley is used for automatic gas shielded welding, the welding wire adopts a 1.2mm specification gas shielded solid welding wire, the tensile strength of the deposited metal of the welding wire is 500-560 MPa, and the distance between the welding wire and the end part of the lap plate is 1-5 mm.
Preferably, during welding, the welding gun forms an included angle of 45-60 degrees with the bottom plate and is inclined backwards at 7-15 degrees with the welding direction.
Preferably, ar + 5-7% of CO is used in welding 2 Gas shielded welding, a direct current power supply reverse connection method, welding current of 175-300A, arc voltage of 21-30V, welding speed of 45-65 cm/min and gas flow of 17-22L/min.
Preferably, the fillet weld has the following shape and size:
L 1 ＝L 2 /tana+x
in the formula (I), the compound is shown in the specification,
L 1 is the weld angle size of the bottom plate, in mm, L 2 The welding angle size of the lap plate is in unit mm, a is an included angle formed by the surface of the fillet weld and the bottom plate, the included angle ranges from 30 degrees to 45 degrees, and x is 1-5 in unit mm.
Compared with the prior art, the invention has the following advantages:
1. by adopting the conventional gas shielded welding process, other complicated measures for improving the fatigue performance of the welding joint are not needed, and the welding cost is effectively reduced;
2. the welding wire position is matched with the welding current, the arc voltage and the welding speed, the size of a welding seam can be restrained according to a formula rule, a welding joint with excellent plane bending fatigue performance is obtained, and the fatigue resistance performance of the whole structure is effectively improved;
3. the lap fillet weld is formed at one time, complex heat treatment after pre-heating before welding and post-welding is avoided, the welding material adopts conventional gas shielded welding wires which are easy to purchase, and the process method is simple and easy to implement and is generally applicable.
Detailed Description
The present invention is further described in detail below with reference to specific examples.
Example 1
Aiming at low-alloy high-strength steel with the 2mm specification and the tensile strength of 370MPa, a lap plate with the same plate thickness and a bottom plate form an angle welding seam, the assembly is carried out in a gapless lap joint mode, and the lap joint quantity is controlled to be 15mm.
The welding wire adopts 1.2mm specification gas shielded solid core welding wire, and welding wire deposition metal tensile strength is 500MPa, and the welding wire is apart from overlap joint plate tip 1mm, and welder and bottom plate are 60 contained angles, and are 7 hypsokinesis with the welding direction.
During welding, adopting a consumable electrode gas shielded welding method, using a welding carriage to perform automatic gas shielded welding, adopting Ar +5% of CO 2 Gas shielded welding, a direct current power supply reverse connection method, welding current 175A, arc voltage 21V, welding speed 65cm/min and gas flow 17L/min.
Welding to form a weld fillet dimension L of the base plate 1 About 4.5mm, fillet size L of lap plate 2 About 2mm, the included angle a formed by the fillet weld surface and the bottom plate is about 30 degrees, x is 1mm, and the size of the welding angle meets the requirement
L 1 ＝L 2 /tana+x
The fillet weld is formed in one step and is a concave weld, and in the formula, the welding angle size L of the bottom plate 1 Take decimal point one bit.
Preheating is not needed before welding and heat treatment is not needed after welding. After welding, preparing a fatigue test sample of a welding joint according to a JISZ2275 metal plate plane bending fatigue test method, performing a plane bending fatigue test according to a stress ratio of 0 and a loading frequency of 25Hz, and circulating for 1 multiplied by 10 under the maximum stress of 240MPa 7 The welding seam is not broken in week time, and the plane bending fatigue performance of the lap joint is excellent.
Example 2
Aiming at 4mm specification low alloy high strength steel with 460MPa tensile strength, a lap plate with the same plate thickness and a bottom plate form an angle welding seam, the assembly is in gapless lap joint, and the lap joint amount is controlled at 16mm.
The welding wire adopts 1.2mm specification gas shielded solid core welding wire, and welding wire deposition metal tensile strength is 500MPa, and the welding wire is apart from overlap joint plate tip 2mm, and welder and bottom plate are 55 contained angles, and are 9 hypsokinesis with the welding direction.
During welding, the welding method is carried out by adopting a consumable electrode gas shielded welding method, the welding trolley is used for automatic gas shielded welding, and the content of Ar +6 percent CO is adopted 2 Gas shielded welding, a direct current power supply reverse connection method, welding current 215A, arc voltage 23V, welding speed 60cm/min and gas flow 18L/min.
Welding to form a weld fillet dimension L of the base plate 1 About 7mm, fillet size L of lap plate 2 About 4mm, fillet weld surface and base plateThe included angle a is about 35 degrees, x is 2mm, and the size of the welding angle satisfies
L 1 ＝L 2 /tana+x
The fillet weld is formed in one step and is a concave weld, and in the formula, the welding angle size L of the bottom plate 1 And (6) taking the whole.
Preheating is not needed before welding and heat treatment is not needed after welding. After welding, preparing a fatigue test sample of a welding joint according to a JISZ2275 metal plate plane bending fatigue test method, performing a plane bending fatigue test according to a stress ratio of 0 and a loading frequency of 25Hz, and circulating for 1 multiplied by 10 under the condition that the maximum stress is 260MPa 7 The welding seam is not broken in week time, and the plane bending fatigue performance of the lap joint is excellent.
Example 3
For low-alloy high-strength steel with the 5mm specification and the tensile strength of 550MPa, a lap plate with the same plate thickness and a bottom plate form a fillet weld, the assembly is carried out in a gapless lap joint mode, and the lap joint amount is controlled to be 18mm.
The welding wire adopts a 1.2mm specification gas shielded solid welding wire, the tensile strength of the welding wire deposited metal is 500MPa, the welding wire is 3mm away from the end part of the lapping plate, the welding gun and the bottom plate form an included angle of 50 degrees, and the welding gun and the welding direction form a backward tilting of 11 degrees.
During welding, the welding method is carried out by adopting a consumable electrode gas shielded welding method, the welding trolley is used for automatic gas shielded welding, and the content of Ar +6 percent CO is adopted 2 Gas shielded welding, a direct current power supply reverse connection method, welding current 245A, arc voltage 25V, welding speed 50cm/min and gas flow 20L/min.
Welding to form a weld fillet dimension L of the base plate 1 About 9mm, lap plate fillet size L 2 About 5mm, the included angle a formed by the fillet weld surface and the bottom plate is about 40 degrees, x is 3mm, and the size of the welding angle meets the requirement
L 1 ＝L 2 /tana+x
The fillet weld is formed in one step and is a concave weld, and in the formula, the welding angle size L of the bottom plate 1 And (6) taking the whole.
Preheating is not needed before welding and heat treatment is not needed after welding. After welding, preparing a fatigue test sample of the welded joint according to a JISZ2275 metal plate plane bending fatigue test method, and performing stress test on the fatigue test sampleThe plane bending fatigue test is carried out at a loading frequency of 25Hz and a ratio of 0, and the cycle is 1 multiplied by 10 under the maximum stress of 290MPa 7 The welding seam is not broken in week time, and the plane bending fatigue performance of the lap joint is excellent.
Example 4
Aiming at low-alloy high-strength steel with the 6mm specification and the tensile strength of 600MPa, a lap plate with the same plate thickness and a bottom plate form an angle welding seam, the assembly is carried out in a gapless lap joint mode, and the lap joint quantity is controlled to be 19mm.
The welding wire adopts a 1.2mm specification gas shielded solid core welding wire, the tensile strength of the welding wire deposited metal is 550MPa, the welding wire is 4mm away from the end part of the lapping plate, and a welding gun and the bottom plate form an included angle of 45 degrees and are inclined backwards by 12 degrees relative to the welding direction.
During welding, adopting a consumable electrode gas shielded welding method, using a welding carriage to perform automatic gas shielded welding, adopting Ar +7% of CO 2 Gas shielded welding, a direct current power supply reverse connection method, 275A of welding current, 27V of arc voltage, 45cm/min of welding speed and 20L/min of gas flow.
Welding to form a weld fillet dimension L of the bottom plate 1 About 10mm, lap plate fillet size L 2 About 6mm, the included angle a formed by the fillet weld surface and the bottom plate is about 45 degrees, x is 4mm, and the size of the welding angle meets the requirement
L 1 ＝L 2 /tana+x
The fillet weld is formed in one step and is a concave weld, and in the formula, the welding angle size L of the bottom plate 1 And (6) taking the whole.
Preheating is not needed before welding and heat treatment is not needed after welding. After welding, preparing a fatigue test sample of a welding joint according to a JISZ2275 metal plate plane bending fatigue test method, performing a plane bending fatigue test according to a stress ratio of 0 and a loading frequency of 25Hz, and circulating for 1 multiplied by 10 under the maximum stress of 325MPa 7 The welding seam is not broken in week time, and the plane bending fatigue performance of the lap joint is excellent.
Example 5
Aiming at 8mm specification low alloy high strength steel with 660MPa of tensile strength, a lap plate with the same plate thickness and a bottom plate form an angle welding seam, gapless lap assembly is carried out, and the lap amount is controlled to be 20mm.
The welding wire adopts a 1.2mm specification gas shielded solid welding wire, the tensile strength of the welding wire deposited metal is 560MPa, the welding wire is 5mm away from the end part of the lap-joint plate, the welding gun and the bottom plate form an included angle of 45 degrees, and the welding gun and the welding direction form a 15-degree backward tilting.
During welding, adopting a consumable electrode gas shielded welding method, using a welding carriage to perform automatic gas shielded welding, adopting Ar +7% of CO 2 Gas shielded welding, a direct current power supply reverse connection method, welding current 300A, arc voltage 30V, welding speed 45cm/min and gas flow 22L/min.
Welding to form a weld fillet dimension L of the base plate 1 About 13mm, fillet size L of the lap plate 2 About 8mm, the included angle a formed by the fillet weld surface and the bottom plate is about 45 degrees, x is 5mm, and the size of the welding angle meets the requirement
L 1 ＝L 2 /tana+x
The fillet weld is formed in one step and is a concave weld, and in the formula, the welding angle size L of the bottom plate 1 And (6) taking the whole.
Preheating is not needed before welding and heat treatment is not needed after welding. After welding, preparing a fatigue test sample of a welding joint according to a JISZ2275 metal plate plane bending fatigue test method, performing a plane bending fatigue test according to a stress ratio of 0 and a loading frequency of 25Hz, and circulating for 1 multiplied by 10 under the maximum stress of 335MPa 7 The welding seam is not broken in week time, and the plane bending fatigue performance of the lap joint is excellent.
The welding method for improving the plane bending fatigue performance of the lap joint adopts a conventional gas shielded welding process, does not have other complicated measures for improving the fatigue performance of the welded joint, and effectively reduces the welding cost; the welding wire position is matched with the welding current, the arc voltage and the welding speed, the size of a welding seam can be restrained according to a formula rule, a welding joint with excellent plane bending fatigue performance is obtained, and the fatigue resistance performance of the whole structure is effectively improved; the lap fillet weld is formed at one time, complex heat treatment after pre-heating before welding and post-welding is avoided, the welding material adopts conventional gas shielded welding wires which are easy to purchase, and the process method is simple and easy to implement and is generally applicable.
Claims (6)
1. A welding method for improving the plane bending fatigue performance of an overlap joint is characterized in that: aiming at low-alloy high-strength steel with the 2-8 mm specification tensile strength of 370-660 MPa, a fillet weld is formed by a lapping plate and a bottom plate which are of the same plate thickness, the shape and the size of the fillet weld are controlled by adopting a gas metal arc welding method, a concave weld is formed, and the one-step forming of the fillet weld is realized.
2. A welding method for improving the plane bending fatigue performance of an overlap joint according to claim 1, wherein: the lapping plate and the bottom plate are lapped and assembled without gaps, and the lapping amount is controlled to be 15-20 mm.
3. A welding method for improving the plane bending fatigue performance of an overlap joint according to claim 1, wherein: during welding, the welding trolley is used for automatic gas shielded welding, the welding wire adopts a 1.2mm specification gas shielded solid welding wire, the tensile strength of the deposited metal of the welding wire is 500-560 MPa, and the distance between the welding wire and the end part of the lap-joint plate is 1-5 mm.
4. A welding method for improving the plane bending fatigue performance of an overlap joint according to claim 1, wherein: during welding, the welding gun forms an included angle of 45-60 degrees with the bottom plate and tilts backwards at 7-15 degrees with the welding direction.
5. A welding method for improving the plane bending fatigue performance of an overlap joint according to claim 1, wherein: when welding, ar + 5-7% of CO is adopted 2 Gas shielded welding, a direct current power supply reverse connection method, welding current of 175-300A, arc voltage of 21-30V, welding speed of 45-65 cm/min and gas flow of 17-22L/min.
6. A welding method for improving the plane bending fatigue performance of an overlap joint according to claim 1, wherein: the fillet weld has the following shape and size:
L 1 ＝L 2 /tana+x
in the formula, L 1 Is the weld angle size of the bottom plate, in mm, L 2 Is the weld corner size of the lap plate, and has a unit of mm, wherein a is the included angle formed by the surface of the fillet weld and the bottom plate and the range of30-45 degrees, x is 1-5, unit mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211012428.9A CN115351396A (en) | 2022-08-23 | 2022-08-23 | Welding method for improving plane bending fatigue performance of lap joint |
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| CN202211012428.9A CN115351396A (en) | 2022-08-23 | 2022-08-23 | Welding method for improving plane bending fatigue performance of lap joint |
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| CN115351396A true CN115351396A (en) | 2022-11-18 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05329682A (en) * | 1992-05-26 | 1993-12-14 | Sumitomo Metal Ind Ltd | Welding wire and welding method for galvanized steel sheet |
| JPH08332568A (en) * | 1995-04-07 | 1996-12-17 | Nippon Steel Weld Prod & Eng Co Ltd | High speed horizontal fillet gas shield arc welding method |
| JP2007296535A (en) * | 2006-04-27 | 2007-11-15 | Kobe Steel Ltd | Gas-shielded arc welding flux-cored wire and welding method |
| US20080142490A1 (en) * | 2006-12-13 | 2008-06-19 | Kabushiki Kaisha Kobe Seiko Sho ( Kobe Steel, Ltd.) | Gas-shielded arc welding method |
| CN104625359A (en) * | 2015-01-27 | 2015-05-20 | 中石化第十建设有限公司 | Welding technique for base plate of LNG low-temperature tank |
| CN109551086A (en) * | 2018-12-27 | 2019-04-02 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of consumable electrode gas-arc high-speed welding method for galvanized sheet |
| CN110839341A (en) * | 2018-06-18 | 2020-02-25 | 株式会社Posco | Welded member of plated steel sheet having excellent weld porosity resistance and fatigue characteristics, and method for producing same |
-
2022
- 2022-08-23 CN CN202211012428.9A patent/CN115351396A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05329682A (en) * | 1992-05-26 | 1993-12-14 | Sumitomo Metal Ind Ltd | Welding wire and welding method for galvanized steel sheet |
| JPH08332568A (en) * | 1995-04-07 | 1996-12-17 | Nippon Steel Weld Prod & Eng Co Ltd | High speed horizontal fillet gas shield arc welding method |
| JP2007296535A (en) * | 2006-04-27 | 2007-11-15 | Kobe Steel Ltd | Gas-shielded arc welding flux-cored wire and welding method |
| US20080142490A1 (en) * | 2006-12-13 | 2008-06-19 | Kabushiki Kaisha Kobe Seiko Sho ( Kobe Steel, Ltd.) | Gas-shielded arc welding method |
| CN104625359A (en) * | 2015-01-27 | 2015-05-20 | 中石化第十建设有限公司 | Welding technique for base plate of LNG low-temperature tank |
| CN110839341A (en) * | 2018-06-18 | 2020-02-25 | 株式会社Posco | Welded member of plated steel sheet having excellent weld porosity resistance and fatigue characteristics, and method for producing same |
| CN109551086A (en) * | 2018-12-27 | 2019-04-02 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of consumable electrode gas-arc high-speed welding method for galvanized sheet |
Non-Patent Citations (1)
| Title |
|---|
| 天津大学 中国石油化工总公司编著: "《金属结构的电弧焊》", pages: 94 - 95 * |
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