WO2000076710A1 - Weld stud with elliptical weld flange - Google Patents
Weld stud with elliptical weld flange Download PDFInfo
- Publication number
- WO2000076710A1 WO2000076710A1 PCT/GB2000/002258 GB0002258W WO0076710A1 WO 2000076710 A1 WO2000076710 A1 WO 2000076710A1 GB 0002258 W GB0002258 W GB 0002258W WO 0076710 A1 WO0076710 A1 WO 0076710A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weld
- stud
- flange
- weld stud
- head
- Prior art date
Links
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 5
- 230000001419 dependent effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000000155 melt Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009966 trimming Methods 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
- B23K9/20—Stud welding
-
- 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
- B23K9/20—Stud welding
- B23K9/207—Features related to studs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B9/00—Connections of rods or tubular parts to flat surfaces at an angle
Definitions
- the invention relates to a weld stud with a free end and head which, in each case, form an end face of the weld stud, the head comprising a weld flange.
- Weld studs of this type are used as fixing elements in many areas, in particular the car industry. They are welded at their head end to a structure so other components can be fixed to the free end. The free end normally has an external structure, giving the stud a similarity, in particular to a fir tree, this being the reason why these studs were given the name fir tree studs.
- Weld studs of this type are preferably fixed by the lift and strike process in which, by means of brief contact of the stud with the structure, an arc is ignited which then continues to burn when the stud is lifted from the structure and which fuses structure and welding flange of the stud. The stud is then lowered again into this melt so a very durable welded connection is produced on solidification of the melt.
- the weld flange at the head of the stud is designed with a correspondingly large diameter according to the state of the art.
- a further problem consists in the fact that the current does not flow evenly through the edge regions of the flange so they are not reliably welded.
- the weld stud according to the invention with a free end and a head which, in each case, form an end face of the weld stud, has a weld flange designed on the head which has a substantially elliptical geometry with a main axis and a secondary axis.
- the ratio of main axis to secondary axis is preferably 10 to 6 up to 9.
- Fig. 1 is a front view of a weld stud according to the invention
- Fig. 2 is a plan view of the geometry of an untrimmed weld flange; and Fig. 3 is a plan view of the geometry of a trimmed weld flange.
- Fig. 1 shows a front view of a weld stud 1 according to the invention.
- the weld stud 1 with its free end 2, which can comprise, in particular a thread, preferably a fir tree-like external structure 11 and with a head 3, which in each case form an end face 4 or 5 of the weld stud 1 has a cylindrical body 6.
- Formed on the head 3 is a weld flange 6 having a substantially elliptical geometry.
- a shoulder 9 Adjacent to the weld flange 6 in the direction of the free end 2 there is additionally formed a shoulder 9 which is generally formed rotationally symmetrically like the rest of the weld stud and is used as support for a component to be fixed to the weld stud, for example a lug, not shown, or a fixing clip.
- Fig. 2 is a plan view of the approximately elliptical geometry of an untrimmed weld flange 6.
- the substantially elliptical geometry of the weld flange 6 is substantially defined by two axes 7 and 8 which are substantially at right angles to one another.
- the main axis 7 is preferably about 10 mm and the subsidiary axis 8 about 8 mm.
- Fig. 3 also shows a plan view of a substantially elliptical geometry of a laterally trimmed weld flange 6 while keeping the preferred ratios of main axis 7 to subsidiary axis 8.
- the trimming of the lateral region 10 of the weld flange 6 is preferably approximately parallel to the subsidiary axis 8.
- the weld stud 1 according to the invention is advantageously suited to the high quality, repeatable welding, with a low number of pores, of weld studs, in particular on thin sheet metal.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
- Arc Welding In General (AREA)
Abstract
The weld stud (1) according to the invention with a free end (2) and a head (3), forming in each case an end face (4, 5) of the weld stud (1), comprises, at the head (3), a weld flange (6), having a substantially elliptical geometry with a main axis (7) and a secondary axis (8). As a result of this design of the weld flange geometry there is a particularly favourable formation of the welding current during welding by the lift and strike process leading to a high quality repeatable welded connection with a small quantity of pores. As the torques transmitted by the welded connection are substantially dependent on the length of the main axis (7) no disadvantages arise in this respect either with an elliptical weld flange compared to a circular weld flange. The weld stud (1) according to the invention is advantageously suited to the welding on a thin sheet metal.
Description
WELD STUD WITH ELLIPTICAL WELD FLANGE
The invention relates to a weld stud with a free end and head which, in each case, form an end face of the weld stud, the head comprising a weld flange.
Weld studs of this type are used as fixing elements in many areas, in particular the car industry. They are welded at their head end to a structure so other components can be fixed to the free end. The free end normally has an external structure, giving the stud a similarity, in particular to a fir tree, this being the reason why these studs were given the name fir tree studs. Weld studs of this type are preferably fixed by the lift and strike process in which, by means of brief contact of the stud with the structure, an arc is ignited which then continues to burn when the stud is lifted from the structure and which fuses structure and welding flange of the stud. The stud is then lowered again into this melt so a very durable welded connection is produced on solidification of the melt.
Depending on the size of the forces and torques which this welded connection has to withstand, the weld flange at the head of the stud is designed with a correspondingly large diameter according to the state of the art.
However, this creates problems such as the need for large currents for welding in the case of large diameters which, in particular in the case of weldings on thin sheet metal, i.e. sheet metal with a thickness smaller than 1 mm, in particular with a thickness smaller than/equal to 0.75 mm, can lead to an undesirable number and/or size of pores in the join region.
A further problem consists in the fact that the current does not flow evenly through the edge regions of the flange so they are not reliably welded.
It is therefore the object of the present invention to provide a weld stud which can be welded, preferably on thin sheet metal, more reliably and with fewer pores.
This object is achieved by a weld stud with the features of claim 1. Advantageous embodiments and developments are given in the dependent claims.
The weld stud according to the invention with a free end and a head which, in each case, form an end face of the weld stud, has a weld flange designed on the head which has a substantially elliptical geometry with a main axis and a secondary axis.
The change in the geometry of the weld flange compared to the state of the art to a substantially elliptical geometry results in a more desirable rotationally non- symmetrical distribution of current and a rotationally non-symmetrical melt during the welding process, as a result of which the weld stud can be welded in an advantageous manner with significantly fewer pores, in particular on thin sheet metal. Due to the higher quality of the welded connection there are no disadvantages as a result of the elliptical form with respect to the torques transmitted as these are substantially dependent on the length of the main axis.
According to the invention the ratio of main axis to secondary axis is preferably 10 to 6 up to 9.
It was possible to achieve particularly good welding results with a preferred ratio of the main axis to the secondary axis of about 10 to 8.
A further improved welding result was achievable with a weld stud which is laterally trimmed approximately parallel to its secondary axis.
Further advantageous embodiments are described hereinafter with reference to the schematic drawings, in which:
Fig. 1 is a front view of a weld stud according to the invention;
Fig. 2 is a plan view of the geometry of an untrimmed weld flange; and
Fig. 3 is a plan view of the geometry of a trimmed weld flange.
Fig. 1 shows a front view of a weld stud 1 according to the invention. The weld stud 1 with its free end 2, which can comprise, in particular a thread, preferably a fir tree-like external structure 11 and with a head 3, which in each case form an end face 4 or 5 of the weld stud 1 has a cylindrical body 6. Formed on the head 3 is a weld flange 6 having a substantially elliptical geometry. Adjacent to the weld flange 6 in the direction of the free end 2 there is additionally formed a shoulder 9 which is generally formed rotationally symmetrically like the rest of the weld stud and is used as support for a component to be fixed to the weld stud, for example a lug, not shown, or a fixing clip.
Fig. 2 is a plan view of the approximately elliptical geometry of an untrimmed weld flange 6. The substantially elliptical geometry of the weld flange 6 is substantially defined by two axes 7 and 8 which are substantially at right angles to one another. The main axis 7 is preferably about 10 mm and the subsidiary axis 8 about 8 mm.
Fig. 3 also shows a plan view of a substantially elliptical geometry of a laterally trimmed weld flange 6 while keeping the preferred ratios of main axis 7 to subsidiary axis 8. The trimming of the lateral region 10 of the weld flange 6 is preferably approximately parallel to the subsidiary axis 8.
The weld stud 1 according to the invention is advantageously suited to the high quality, repeatable welding, with a low number of pores, of weld studs, in particular on thin sheet metal.
Claims
1. Weld stud (1) with a free end (2) and a head (3), which in each case form an end face (4, 5) of the weld stud (1), wherein the head (3) comprises a weld flange (6), having a substantially elliptical geometry with a main axis (7) and a secondary axis (8).
2. Weld stud (1) according to claim 1, wherein the ratio of the main axis (7) to the secondary axis (8) is approximately 10 to 6 up to 9.
3. Weld stud (1) according to claim 2, characterised in that the ratio of main axis (7) to the subsidiary axis (8) is approximately 10 to 8.
4. Weld stud (1) according to claims 1, 2 or 3, wherein the weld flange (6) is laterally trimmed (10) approximately parallel to its secondary axis (8).
5. Weld stud (1) according to one of the preceding claims, characterised in that the free end (2) comprises an external structure (11), in particular a thread, preferably in the manner of a fir tree.
6. Weld stud (1) according to one of the preceding claims, characterised in that the weld stud (1) consists of aluminium or an aluminium alloy.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29910229U DE29910229U1 (en) | 1999-06-11 | 1999-06-11 | Welding studs with an elliptical welding flange |
DE299/10/229.7 | 1999-06-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000076710A1 true WO2000076710A1 (en) | 2000-12-21 |
Family
ID=8074685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/002258 WO2000076710A1 (en) | 1999-06-11 | 2000-06-09 | Weld stud with elliptical weld flange |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE29910229U1 (en) |
WO (1) | WO2000076710A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113600982A (en) * | 2021-07-22 | 2021-11-05 | 中国航空制造技术研究院 | Screw for stud welding and welding device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006016553B4 (en) * | 2006-04-07 | 2008-02-14 | Heinz Soyer Bolzenschweisstechnik Gmbh | Method and system for arc stud welding and welding studs |
DE102016212495A1 (en) * | 2016-07-08 | 2018-01-11 | Bolzenschweißtechnik Heinz Soyer GmbH | Welding method based on the principle of lift ignition using a magnetically moved arc, as well as welding element |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4300630A (en) * | 1977-01-28 | 1981-11-17 | Trojani Benito L | Finned metal tube and method for making the same |
DE29620020U1 (en) * | 1996-07-05 | 1997-01-16 | Emhart Inc., Newark, Del. | Welding stud with external thread |
-
1999
- 1999-06-11 DE DE29910229U patent/DE29910229U1/en not_active Expired - Lifetime
-
2000
- 2000-06-09 WO PCT/GB2000/002258 patent/WO2000076710A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4300630A (en) * | 1977-01-28 | 1981-11-17 | Trojani Benito L | Finned metal tube and method for making the same |
DE29620020U1 (en) * | 1996-07-05 | 1997-01-16 | Emhart Inc., Newark, Del. | Welding stud with external thread |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113600982A (en) * | 2021-07-22 | 2021-11-05 | 中国航空制造技术研究院 | Screw for stud welding and welding device |
Also Published As
Publication number | Publication date |
---|---|
DE29910229U1 (en) | 1999-09-02 |
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