NP
Contact us You can contact us using any of the methods below. Unit 3 Durham Lane Armthorpe Doncaster South Yorkshire DN3 3FE England +44 (0)1302 836010 +44 (0)1302 836012 sales@npfasteners.com
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NORTHERN PRECISION LTD
Accreditations Northern Precision Ltd operate a quality management system in accordance with ISO 9001:2008. The ISO 9001:2008 standard is recognised worldwide and you can be assured of the benefits of working with a certified company knowing that our management systems are constantly assessed and improved.
Registered in England & Wales Company number 3275391
V.A.T Registration number GB 684 1384 17
NP
NORTHERN PRECISION LTD
Specialist Fasteners for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 836012
Tel:
Fax:
sales@npfasteners.com
Quality
Service
Reliability
Northern Precision Ltd YouTube Channel
Weld Gun
Stud
Base Panel
Stud in place with Initial pressure provided by gun on base panel.
Insert stud in gun and position on panel
Press trigger
Welding cycle
Release
Stud is now welded in place
Stored energy is discharged as a high current pulse.
The high current melts the pip on the head and  produces an arc.
Return spring pressure presses the stud into the molten surface and fuses the base of the stud with the base panel.
Perform your preferred tests to confirm correct weld formation and ensure stud meets required performance criteria.
~0.04 seconds
1
2
3
4
Weldability cross reference
Base Panel Material
CD Weld Stud Material
Mild Steel
Stainless Steel
Aluminium
Brass
Low Carbon Mild Steel
Steel up to 0.6% carbon
Austenitic Stainless Steel
Zinc coated Steel
Electro Galvanised Steel
Hot Rolled Steel
Aluminium Alloy
Pure Aluminium
Lead Free Brass
Leaded Brass
Lead Free Copper
Good
Fair
Good
Fair
Fair
Fair
Not Weldable
Not Weldable
Good
Not Weldable
Fair
Good
Good
Good
Fair
Fair
Fair
Not Weldable
Not Weldable
Fair
Not Weldable
Fair
Not Weldable
Not Weldable
Not Weldable
Not Weldable
Not Weldable
Not Weldable
Good
Good
Not Weldable
Not Weldable
Not Weldable
Good
Good
Fair
Good
Good
Fair
Not Weldable
Not Weldable
Good
Not Weldable
Good
Material & Finish
Copper Coated Steel (CP) Stainless Steel (A2) Aluminium (AL) Brass (BR)
Part Number Examples
Part number is made up as follows: (Type)-(Thread/Dia.)-(Length)-(Material/Finish code) For example: WS-M4-10-CP (CD Weld Stud-M4-10mm long-copper coated steel) WS-6MM-15-A2 (CD Weld Pin-6mm Diameter-15mm long-stainless steel)
RoHS REACH COMPLIANT
Dimensional
Thread Size Pin Dia. ±0.1
M3 x 0.5 3MM
M4 x 0.7 4MM
M5 x 0.8 5MM
M6 x 1.0 6MM
M8 x 1.25 8MM
M10 x 1.5 -
D ±0.2
4.5
5.5
6.5
7.5
9.0
10.5
H
0.7 - 1.4
0.7 - 1.4
0.8 - 1.4
0.8 - 1.4
0.8 - 1.4
0.8 - 1.6
L ±0.5
6
6
6
-
-
-
8
8
8
8
-
-
10
10
10
10
10
-
12
12
12
12
12
12
15
15
15
15
15
15
20
20
20
20
20
20
25
25
25
25
25
25
30
30
30
30
30
30
35
35
35
35
35
35
40
40
40
40
40
40
45
45
45
45
45
45
-
50
50
50
50
50
-
-
55
55
55
55
-
-
-
60
60
60
±0.4
Preferred lengths shown. Other lengths available to order.
Installation and materials compatibility
Info
The capacitor discharge (CD) process is suitable for attaching smaller diameter fasteners to thin sheet metal applications. The weld cycle is completed in milliseconds meaning that weld can be achieved without generating pronounced distortion or discolouration on the reverse side of the panel.   CD stud welding is a versatile single fastening process where threaded studs and unthreaded pins can be end joined to a sheet metal application instantaneously. CD Weld Studs and Pins are available in a range of thread sizes, diameters and lengths, manufactured from copper coated steel, stainless steel, aluminium and brass and are suitable for use with compatible panel materials as thin as 0.5mm. CD Weld studs and pins require appropriate stud welding equipment for attachment.
Capacitor Discharge Weld Studs and Pins
CAPACITOR DISCHARGE (CD) WELD STUDS & PINS
cd weld studs