Capacitor discharge or drawn arc
Capacitor discharge is fast and leaves little mark on the back of thin sheet. Drawn arc welds larger studs with a ceramic ferrule or gas. Ask the stud range for each.
No DramaBuyer guide · Metal & CNC
Stud welding is two processes under one name, capacitor discharge for small studs on thin sheet and drawn arc for larger studs on thicker material, and buying the wrong one shows as burn marks or weak welds on your parts.

01
Capacitor discharge is fast and leaves little mark on the back of thin sheet. Drawn arc welds larger studs with a ceramic ferrule or gas. Ask the stud range for each.
Ask for the gun type, lift adjustment, and a chuck for every stud size you use.
A CNC table places many studs on panels by program. It pays when positions repeat.
Studs and ferrules to EN ISO 13918 fit most guns. Ask whether the machine needs its own studs.
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Send these with the enquiry. Without them, any number a factory gives you is a guess dressed as a quotation.
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| Require this | A pass looks like |
|---|---|
| Weld your studs on your sheet and bend or torque test them as EN ISO 14555 describes. | No weld failure; the stud or the sheet fails first. |
| Inspect the reverse side of thin sheet after welding. | Marking inside what your visible face accepts. |
| Weld at your production rate for an hour. | Last weld passes the same test as the first. |
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A nut projection welder or clinch nuts; several listings sold projection welders under this name.
A CNC stud welding table or robotic welding cell.
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We name the kind of source, how many and when, and never the factory. Listed prices are asking prices, not landed cost. Where we do not hold a fact we say so: that is a GAP, not an estimate.
07
Every machine we source in this area is on the Metal & CNC page. How a project runs, stage by stage, is on how it works, and what it costs is on pricing.
Straight answers
Power sources can be close. Gun build and chuck quality differ.
The three tests above, chucks counted per stud size.
A Declaration of Conformity naming its directives and standards, and a manual in your language.
If you import it yourself, you are: check the documents and put your name and address on it.
Contact
Send a machine, a quotation you want checked, or a question. We reply with what we would look at first.
Sent
A person reads every message. You will hear back within one working day.
Not sent
Please email info@nodramachina.com directly and we will pick it up from there.