CN101293468A - Welding process for rear overhang rack - Google Patents
Welding process for rear overhang rack Download PDFInfo
- Publication number
- CN101293468A CN101293468A CNA2008100389122A CN200810038912A CN101293468A CN 101293468 A CN101293468 A CN 101293468A CN A2008100389122 A CNA2008100389122 A CN A2008100389122A CN 200810038912 A CN200810038912 A CN 200810038912A CN 101293468 A CN101293468 A CN 101293468A
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- CN
- China
- Prior art keywords
- welding
- trailing arm
- welding process
- rear overhang
- overhang rack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to a welding technique of a back suspension fork of an automobile; a reinforced plate is connected with a dragging arm; the invention is characterized in that the head part of a welding line is welded with a smooth arc and then is transited to the bottom side of the dragging arm; the welding technique of the invention has the advantages of removing the heat treatment after the welding and eliminating welding residual stress of the welding joint of the reinforced plate, thereby simplifying the technique during manufacture, being easy to control the quality, improving the fatigue strength of a product and reducing the manufacturing cost.
Description
Technical field
The present invention relates to a kind of welding process of rear overhang rack, relate in particular to a kind of welding process of rear overhang rack-trailing arm, the strength at repeated alternation of suspension system is further improved, belong to the welding technique field.
Background technology
At home, for being suitable for a kind of requirement of car chassis, increase the intensity of its rear suspension-trailing arm, increase a brace panel at automobile with rear suspension-trailing arm, brace panel and trailing arm are for being welded to connect.
Brace panel and trailing arm body welding process have following characteristics:
The equal tight weld of the starting the arc and receipts arc position when 1, brace panel and trailing arm weld;
The surplus of 12mm was all stayed in the starting the arc and receipts arc position when 2, brace panel and trailing arm welded from end points;
Above welding process has following shortcoming when doing the suspension fatigue test:
Ignore focal point of stress when 1, test loads;
2, ignored welding heat affected zone;
More than the characteristics of two welding processs when doing the suspension fatigue test, all do not meeting the requirements of fracture taken place under the times of fatigue situation.
Rear suspension-trailing arm fracture position is welding heat affected, cause by fatigue, illustrate that rear suspension-trailing arm is subjected under the situation of load, stress mainly concentrates on the position of weld, because the anisotropic character of weld seam, the weld seam of rear suspension-trailing arm need be arranged according to stressed situation, reasonably weld seam is arranged the strength at repeated alternation that can improve structure effectively, trailing arm brace panel weld is subjected to flexure stress after being subjected to plus load, and weld seam is a straight weld, and its weld seam belongs to unreasonable layout.
The variation of weld metal zone metalline, can be divided into three districts: weld metal, heat affected zone, parent metal, three districts have different metallographic microstructures, unrelieved stress and mechanical characteristics, weld metal has tangible anisotropy, heat affected zone Yin Gaowen in welding process causes crystallization again, thereby cause crystal grain excessive, reduce strength at repeated alternation, stress concentration is one of principal element that influences welded joint fatigue strength.
The effect and the steady component of stress of unrelieved stress that it is generally acknowledged welding is suitable, the stretching unrelieved stress is equivalent to a stretching steady component of stress, strength at repeated alternation is reduced, and the measure of elimination unrelieved stress is that member is heat-treated, but very difficult at the complicated heat treatment of trailing arm member.
Summary of the invention
The purpose of this invention is to provide that a kind of technology is simple, cost reduces, can improve the welding process of the rear overhang rack of rear suspension-trailing arm strength at repeated alternation.
For realizing above purpose, technical scheme of the present invention provides a kind of welding process of rear overhang rack, and brace panel and trailing arm welding is characterized in that the arc transition of welding again at the welding line joint position with slyness arrives the trailing arm base.
Described arc length is 40mm-46mm, and the radius of circular arc is 30mm-40mm, and the width of weld seam is 5mm-9mm.
The present invention by original welding line joint position extend out the back to the bottom with the circular arc of slyness excessively to the bottom, make the position of heat affected zone avoid focal point of stress, the arc transition reasonable weld seam of subordinate on earth arranges that the flexure stress that member is received behind the stress that makes it and the plus load is consistent.
Advantage of the present invention is to have reduced the welding back by heat treatment step, has eliminated the welding residual stress of brace panel welded joint, thereby has simplified technology aborning, and quality is controlled easily, has improved the strength at repeated alternation of product, has reduced productive costs.
Description of drawings
Fig. 1 is a kind of welded structure scheme drawing of rear overhang rack;
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 1, welded structure scheme drawing for a kind of rear overhang rack, the welding process of described a kind of rear overhang rack is: brace panel 1 and trailing arm 2 welding, the circular arc 4 that welds again with slyness at weld seam 3 joint areas excessively arrives trailing arm 2 bases, described circular arc 4 length are 43mm, the radius of circular arc is 35mm, and weld width is 7mm, and all welding parameters are the same with original welding.
The rear overhang rack that welded is all meeting the requirements of when doing the suspension fatigue test phenomenon of rupture is not taking place after the times of fatigue.
Claims (2)
1. the welding process of a rear overhang rack, brace panel (1) and trailing arm (2) welding is characterized in that the circular arc (4) that welds again with slyness at weld seam (3) joint area carries out the transition to trailing arm (2) base.
2. the welding process of a kind of rear overhang rack according to claim 1 is characterized in that, described circular arc (4) length is 40mm-46mm, and the radius of circular arc is 30mm-40mm, and the width of weld seam is 5mm-9mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100389122A CN101293468A (en) | 2008-06-13 | 2008-06-13 | Welding process for rear overhang rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100389122A CN101293468A (en) | 2008-06-13 | 2008-06-13 | Welding process for rear overhang rack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101293468A true CN101293468A (en) | 2008-10-29 |
Family
ID=40064111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100389122A Pending CN101293468A (en) | 2008-06-13 | 2008-06-13 | Welding process for rear overhang rack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101293468A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101879849A (en) * | 2010-06-25 | 2010-11-10 | 重庆长安汽车股份有限公司 | Automobile rear independent suspension swing arm mounting bracket assembly |
| CN102350927A (en) * | 2011-07-18 | 2012-02-15 | 奇瑞汽车股份有限公司 | Automobile towing-arm mounting seat structure of independent suspension and production method thereof |
| CN105946486A (en) * | 2016-06-13 | 2016-09-21 | 奇瑞汽车股份有限公司 | Trailing arm |
-
2008
- 2008-06-13 CN CNA2008100389122A patent/CN101293468A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101879849A (en) * | 2010-06-25 | 2010-11-10 | 重庆长安汽车股份有限公司 | Automobile rear independent suspension swing arm mounting bracket assembly |
| CN102350927A (en) * | 2011-07-18 | 2012-02-15 | 奇瑞汽车股份有限公司 | Automobile towing-arm mounting seat structure of independent suspension and production method thereof |
| CN105946486A (en) * | 2016-06-13 | 2016-09-21 | 奇瑞汽车股份有限公司 | Trailing arm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081029 |