Pins
UT
SMOOTH SHANK.
FLANGE.
CAPACITOR DISCHARGE.
| Standard | DIN EN ISO 13918 |
| Type | UT – smooth pin with flange and ignition tip |
| Welding process | Tip ignition / capacitor discharge |
| Diameter | 3 / 4 / 5 / 6 / 7.1 mm according to the dimensional sheet |
| Minimum length | 8 / 12 / 15 mm, depending on diameter |
| materials | Copper-plated steel 4.8, stainless steel A2-50, aluminium AlMg3 |
UT pins for capacitor discharge welding.
Available materials include copper-plated steel 4.8, stainless steel A2-50 and aluminium AlMg3. Material and dimensions are selected to suit the welding task.
The ignition tip melts during welding. The flange remains part of the pin.
UT pins
in accordance with DIN EN ISO 13918
| Ø d₁ +0.1 | l₁ min +0.6 | Flange d₂ ±0.2 | Ignition tip d₄ ±0.08 | l₃ ±0.05 | h₁ | α ±2° |
|---|---|---|---|---|---|---|
| 3 | 8 | 4,5 | 0,60 | 0,55 | 0.7 to 1.4 | 174° |
| 4 | 8 | 5,5 | 0,65 | 0,55 | 0.7 to 1.4 | 174° |
| 5 | 12 | 6,5 | 0,75 | 0,80 | 0.7 to 1.4 | 174° |
| 6 | 12 | 7,5 | 0,75 | 0,80 | 0.7 to 1.4 | 174° |
| 7,1 | 15 | 9 | 0,75 | 0,85 | 0.8 to 1.4 | 174° |
All length dimensions in mm. l₁ min denotes the minimum length before welding. According to the dimensional sheet, approximately l₂ = l₁ − 0.3 mm.
| Steel | 4.8, copper-plated |
|---|---|
| Stainless steel | A2-50 |
| Aluminium | AlMg3 |
Order enquiry
Please specify type UT, diameter, required length, material and quantity. We clarify further versions and availability to suit your application.
Applications for
UT pins
Control cabinet & enclosure manufacturing
General sheet metal fabrication
Electrical engineering & electronics
Equipment manufacturing
Facade & metal construction
Medical & laboratory technology
Stud welding
with capacitor discharge
Still unsure which stud to choose?
Find the right solution for your application.
Equipment for
UT pins
Frequently asked questions
about UT pins
Which diameters and lengths are available for UT?
The manufacturer’s dimensional sheet lists diameters of 3, 4, 5, 6 and 7.1 mm. Minimum lengths are 8, 12 or 15 mm depending on diameter. We confirm the required available length and availability on request.
Which materials are available?
According to the manufacturer, UT pins are available in copper-plated steel 4.8, stainless steel A2-50 and aluminium AlMg3. We review further materials and special designs on request.
What are the functions of the flange and ignition tip?
The UT has a smooth shank, a flange at the welding end and a defined ignition tip. The ignition tip initiates the welding process and melts during it. The flange remains part of the pin.
What changes during welding of the UT pin?
The ignition tip melts and the pin is joined to the workpiece. According to the manufacturer’s UT dimensional sheet, the length after welding is approximately 0.3 mm shorter. The actual joint geometry depends on the material and welding parameters.
What should be considered when designing the joint?
Stud dimensions, material, sheet thickness and loading must suit the application. Joint suitability must be assessed for the specific welding task using appropriate tests. We support the selection process.
Are ceramic ferrules required for UT?
UT pins are processed using capacitor discharge welding. RF ceramic ferrules are not used for this process.
Which units and welding guns are suitable for UT?
The manufacturer’s page lists CDP-99M and GAP-M as well as the RAPIDOR QF automatic welding head, among others. The unit, pin holder and parameters are selected to suit the material, diameter and welding task.
Are special dimensions available?
Yes. Further dimensions and materials are available on request. We review a suitable version for your application.
