CN104858535A - Connection method for improving strength of overlap joints - Google Patents
Connection method for improving strength of overlap joints Download PDFInfo
- Publication number
- CN104858535A CN104858535A CN201510253324.0A CN201510253324A CN104858535A CN 104858535 A CN104858535 A CN 104858535A CN 201510253324 A CN201510253324 A CN 201510253324A CN 104858535 A CN104858535 A CN 104858535A
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- China
- Prior art keywords
- welding
- rectangular indentation
- overlap
- attachment
- raising
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Classifications
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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
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the technical field of welding, in particular to a connection method for improving the strength of overlap joints. The connection method is suitable for the welding process of various aluminum alloy overlap joints with the overlap jointing distance larger than or equal to 20 mm. The connection method for improving the strength of overlap joints includes the following steps that a, a plurality of rectangular notches are machined in the overlap joint edge of an upper overlap joint plate before welding; b, welding is conducted along the edge of a lap weld according to a conventional welding method. Compared with the prior art, the connection method for improving the strength of overlap joints has the advantages that the stress condition of welding seams is changed by enlarging the bearing area of the welding seams, so that the bearing load of the welding seams is improved.
Description
Technical field
The present invention relates to welding technology field, particularly a kind of method of attachment improving lap joint intensity, be applicable to the lap joint of various aluminium alloy and overlap distance is not less than the welding process of 20mm.
Background technology
Energy problem becomes more and more serious, makes the key alleviating automotive dead weight, reduction oil consumption Cheng Liaoge great automobile production manufacturer improves the competitiveness.It is reported, vehicle weight often reduces 50kg, and the distance of often liter of fuel oil traveling can increase 2km.Aluminium alloy density is about 1/3rd of steel, and its corrosion resistance is good, and plasticity is excellent, the techniques such as casting, forging, punching press can be adopted to process, therefore automobile uses increasing aluminium alloy to reduce car weight to replace steel, thus reduces oil consumption.The use of aluminium alloy part, makes the welding between aluminium alloy part also apply more.Welded faces many difficult problems, and weld strength coefficient low be one of sixty-four dollar question, strength of welded joint can be caused to decline.Cause the low main cause of weld strength coefficient to be: (1) aluminium alloy thermal conductivity is good, thermal weld stress is large, under the effect of Thermal Cycle, defines softened zone in heat affected area (HAZ); (2) aluminium in atmosphere and welding time be very easily oxidized, the aluminium oxide (Al of generation
2o
3) fusing point is high, highly stable, not easily removes, and easily generates slag inclusion, incomplete fusion, the defect such as lack of penetration; (3) surface film oxide of aluminium alloy can adsorb a large amount of moisture, easily makes weld seam produce pore, thus reduces weld seam loaded area and then cause strength of joint to reduce.
The phenomenon that strength of welded joint declines is more obvious in overlap joint welding.Overlap joint welding is welded lap joint, namely two joints of workpiece (upper plate and lower plate) be separated hang together the welding of (be not to together with), aluminum alloy lapped welding has a common boundary the existence in face due to it, oxidizable in welding process, thus produce the problem such as slag inclusion and pore, during overlap joint welding simultaneously, welding parameter variable quantity is many, and these all can cause the strength factor of aluminum alloy lapped plumb joint to reduce.
Summary of the invention
The object of the invention is to provide a kind of method of attachment improving lap joint intensity, to solve the above-mentioned technical problem existed in prior art.
The object of the invention is realized by following technical scheme:
Improve a method of attachment for lap joint intensity, comprise the following steps:
(1) upper plate and lower plate overlap distance d at least ensure at more than 20mm, and assembling during welding between upper and lower two plates ensures gapless, and is fixed by upper and lower two plates with fixture;
(2) multiple rectangular indentation is processed at the overlap joint edge of overlap joint upper plate before welding; The width a of described rectangular indentation is no more than 2d/3, the length b of rectangular indentation at least should be 1.5 times of width a, spacing c between adjacent two rectangular indentation is approximately the length b of rectangular indentation, is at least 10mm near the overlap joint rectangular indentation of upper plate end and the distance of nearest overlap joint upper plate end.
(3) welding before to upper plate and lower plate carry out pickling and alkali cleaning surface to remove oxide-film, then natural drying 24h, welds afterwards again.
(4) adopt welding, welding gun clamping on robot arm, carry out automatic welding.Remain in welding process that welding gun inclination angle is 45 °, welding gun is positioned in the plane perpendicular to workpiece, finally completes welding along upper plate overlap joint edge;
(5) chamfer machining is carried out to the corner angle of whole weld seam transition region, in case there is defects such as not filling up.
(6) also trimming is checked.
Preferably, the spacing between adjacent two rectangular indentation equals the length of rectangular indentation.
Preferably, described overlap joint upper plate is dull and stereotyped or arc.
Compared with prior art, the present invention has following advantage:
1, the method for attachment of raising lap joint intensity of the present invention is by increasing weld seam loaded area, changes weld seam stress, thus improves the bearing load of weld seam.
2, the method for attachment of raising lap joint intensity of the present invention is except adopting robot in conjunction with except gas metal-arc welding, can also adopt the method such as manual electric arc welding and TIG (argon tungsten-arc welding) landfilling area, flexible to operation.
3, the method for attachment of raising lap joint intensity of the present invention is except carrying out except dull and stereotyped overlap welding, can also carry out cylinder overlap welding.
Accompanying drawing explanation
Fig. 1 is the assembling schematic diagram before the upper plate of embodiments of the invention 1 and lower plate welding;
Fig. 2 is the machining sketch chart of embodiments of the invention 1.
Detailed description of the invention
The invention discloses a kind of method of attachment improving lap joint intensity, be mainly applicable to the overlap welding that overlap distance d is greater than 20mm.Cardinal principle of the present invention relies on the loaded area increasing weld seam and the stress changing weld seam, thus improve joint bearing load.Welding method key step of the present invention is: determine overlap distance d, calculates the spacing c between length b, the width a of rectangular indentation and adjacent two rectangular indentation according to overlap distance d.According to the shape of rectangular indentation and the length of lapping plate to be welded, design quantity and the position of rectangular indentation, finally upper plate is processed, weld again afterwards.Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment 1
In the present embodiment, sheet material to be welded is A356 aluminium alloy, and welding board size is 215mm × 175mm × 4mm, and overlap distance d is 25mm, as shown in Figure 2.Adopt welding method, packing material is ER4043 welding wire, and protective gas is straight argon, and welding current is 130A, speed of welding 0.9m/min, finally completes the welding of whole overlap edge with manipulator.
The first step, according to the size of overlap distance d and lapping plate, process multiple rectangular indentation 11 at the overlap joint edge of overlap joint upper plate 1 before welding, be processed into the sample shown in Fig. 1,2, rectangular indentation 11 quantity processed be 3, wherein in Fig. 2, institute's target size is not used in restriction.Be specially: the width a of described rectangular indentation 11 is 15mm, the length b of rectangular indentation 11 is 25mm, spacing between adjacent two rectangular indentation 11 is 25mm, is at least 10mm near the overlap joint rectangular indentation of upper plate end and the distance e of nearest overlap joint upper plate end.Lower plate 2 and the upper plate 1 that processes are polished with sand paper, removing surface and oil contaminant, then carries out pickling and alkali cleaning to remove oxide-film, after natural drying 24h, to be welded.
Second step, welding gun clamping on a robotic arm, according to path of welding, setting manipulator run trace, ensures that welding gun is positioned on the vertical plane of upper plate to be welded all the time, and is 45 ° with the angle of upper plate, torch neck is 10mm from root of weld distance.
3rd step, setting speed of welding is 0.9m/min, and welding current is 135A, and argon flow amount is 15L/min, welds along lap weld edge.
4th step, carries out chamfer machining to the corner angle of whole weld seam transition region, in case there is defects such as not filling up.
5th step, checks and trimming.
Mechanics Performance Testing is carried out to the sample adopting above welding method to complete, specific as follows:
Edge is perpendicular to bead direction, intercepting comprises half rectangular indentation half non-rectangle breach weld seam, width is 25mm, carry out tensile property test, bearing maximum load is 16.24kN, and same sample intercepts the wide weld seam of the 25mm not comprising rectangular indentation, recording and bearing maximum load is 12.9kN, visible, weld after being processed into rectangular indentation compared with directly welding, the maximum load that the weld seam welded again after being processed into rectangular indentation bears can improve about 25.9% again.
Contrast above data, can learn that welding method of the present invention is significantly increased to the maximum load that lap joint bears, remarkable to the effect improving strength of joint.
In the present embodiment, upper plate 1 and lower plate 2 are flat board, and in other embodiments, upper plate 1 and lower plate 2 can be arc or cylinder.
Above-described embodiment is selected about the material of lapping plate, size and rectangular indentation processing dimension position, welding wire, the selection of welding method, the selection of concrete technology parameter are only and illustrate, above-described embodiment also should not be construed as limitation of the invention.
The disclosed preferred embodiment of the present invention just sets forth the present invention for helping above.Preferred embodiment does not have all details of detailed descriptionthe, does not limit the detailed description of the invention that this invention is only described yet.Obviously, according to the content of this description, can make many modifications and variations.This description is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes art technical staff understand well and to utilize the present invention.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (7)
1. improve a method of attachment for lap joint intensity, it is characterized in that, comprise the following steps:
A. multiple rectangular indentation is processed at the overlap joint edge of overlap joint upper plate before welding;
B. welding method is conveniently welded along lap weld edge.
2. the method for attachment of raising lap joint intensity according to claim 1, it is characterized in that, the width of described rectangular indentation is no more than 2/3 of overlap distance, the length of rectangular indentation at least should be 1.5 times of width, spacing between adjacent two rectangular indentation is approximately the length of rectangular indentation, is at least 10mm near the overlap joint rectangular indentation of upper plate end and the distance of nearest overlap joint upper plate end.
3. the method for attachment of raising lap joint intensity according to claim 2, is characterized in that, the spacing between adjacent two rectangular indentation equals the length of rectangular indentation.
4. the method for attachment of raising lap joint intensity according to claim 1, is characterized in that, also comprises and treated the step that oxide-film removal is carried out in welding zone territory before step b.
5. the method for attachment of raising lap joint intensity according to claim 1, is characterized in that, after step b, also comprise step c: carry out chamfer machining to the corner angle of whole weld seam transition region.
6. the method for attachment of raising lap joint intensity according to claim 5, is characterized in that, after step c, also comprise steps d: check and trimming.
7. according to the method for attachment of the raising lap joint intensity in claim 1-6 described in any one, it is characterized in that, described overlap joint upper plate is dull and stereotyped or arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510253324.0A CN104858535A (en) | 2015-05-18 | 2015-05-18 | Connection method for improving strength of overlap joints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510253324.0A CN104858535A (en) | 2015-05-18 | 2015-05-18 | Connection method for improving strength of overlap joints |
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| CN104858535A true CN104858535A (en) | 2015-08-26 |
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| CN201510253324.0A Pending CN104858535A (en) | 2015-05-18 | 2015-05-18 | Connection method for improving strength of overlap joints |
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| CN (1) | CN104858535A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020078819A (en) * | 2018-11-14 | 2020-05-28 | 株式会社Uacj | Lap fillet welding method for aluminium alloy plate |
| CN113500275A (en) * | 2021-07-22 | 2021-10-15 | 南京航空航天大学 | GMAW (gas metal arc welding) welding process for improving formation and performance of high-speed electric arc lap welding seam of sheet steel |
Citations (7)
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|---|---|---|---|---|
| JPH03161176A (en) * | 1989-11-16 | 1991-07-11 | Sky Alum Co Ltd | Lap welding method for surface treated aluminum sheet metals |
| JPH11320099A (en) * | 1998-05-15 | 1999-11-24 | Honda Motor Co Ltd | Lap arc welding method for aluminum based workpiece |
| JP2000263235A (en) * | 1999-03-11 | 2000-09-26 | Kobe Steel Ltd | Structural material for weld joint |
| CN102395443A (en) * | 2009-04-15 | 2012-03-28 | 本田技研工业株式会社 | Weld joint of aluminum alloy member |
| CN103231154A (en) * | 2013-04-26 | 2013-08-07 | 上海交通大学 | Welding method for improving aluminum alloy overlap joint strength |
| CN103486363A (en) * | 2013-10-08 | 2014-01-01 | 俞亮亮 | Aluminum alloy pipeline achieving equal-diameter welding and butt joint |
| CN103521898A (en) * | 2013-10-08 | 2014-01-22 | 俞亮亮 | Unequal-diameter welding butt joint aluminum alloy pipe |
-
2015
- 2015-05-18 CN CN201510253324.0A patent/CN104858535A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03161176A (en) * | 1989-11-16 | 1991-07-11 | Sky Alum Co Ltd | Lap welding method for surface treated aluminum sheet metals |
| JPH11320099A (en) * | 1998-05-15 | 1999-11-24 | Honda Motor Co Ltd | Lap arc welding method for aluminum based workpiece |
| JP2000263235A (en) * | 1999-03-11 | 2000-09-26 | Kobe Steel Ltd | Structural material for weld joint |
| CN102395443A (en) * | 2009-04-15 | 2012-03-28 | 本田技研工业株式会社 | Weld joint of aluminum alloy member |
| CN103231154A (en) * | 2013-04-26 | 2013-08-07 | 上海交通大学 | Welding method for improving aluminum alloy overlap joint strength |
| CN103486363A (en) * | 2013-10-08 | 2014-01-01 | 俞亮亮 | Aluminum alloy pipeline achieving equal-diameter welding and butt joint |
| CN103521898A (en) * | 2013-10-08 | 2014-01-22 | 俞亮亮 | Unequal-diameter welding butt joint aluminum alloy pipe |
Non-Patent Citations (1)
| Title |
|---|
| 李淑华等: "《焊接技师技术问答》", 31 July 2005, 国防工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020078819A (en) * | 2018-11-14 | 2020-05-28 | 株式会社Uacj | Lap fillet welding method for aluminium alloy plate |
| JP7132830B2 (en) | 2018-11-14 | 2022-09-07 | 株式会社Uacj | Lap fillet welding method for aluminum alloy plate |
| CN113500275A (en) * | 2021-07-22 | 2021-10-15 | 南京航空航天大学 | GMAW (gas metal arc welding) welding process for improving formation and performance of high-speed electric arc lap welding seam of sheet steel |
| CN113500275B (en) * | 2021-07-22 | 2022-06-21 | 南京航空航天大学 | GMAW (gas metal arc welding) welding process for improving formation and performance of high-speed electric arc lap welding seam of sheet steel |
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Application publication date: 20150826 |
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