KÖCO KST 108 - The Welding Gun; Technical Data of KÖCO Welding Guns

2.3 The Welding Gun
In tip ignition stud welding, the task of the welding gun is to hold the stud in its chuck, to conduct the welding
current through the stud, and to unite the two welding pools by means of precisely controlled movements.
When the welding process is triggered, the ESP 1 S gun first generates the air gap by activating its lifting mag-
net. As soon as the piston has been lifted to its set end position, the magnet is switched off, and the piston is
moved towards the workpiece by means of spring force. At the same time, the welding thyristor ignites, transfer-
ring the charging voltage from the capacitor to the welding clamps. As soon as the stud comes into contact with
the workpiece, the welding process begins (see fig 1). Due to the acceleration of the piston in the air gap, the
welding time (i.e. the time taken to cover the length of the ignition tip) can be adjusted by changing the width of
the air gap. Welding times are longer with a narrow gap than with a large gap.
The ESP 1 K gun is a device for contact welding. Therefore, it is only equipped with a pressure spring, without a
magnet. When the gun is triggered, the welding thyristor ignites immediately, and consequently the starting ve-
locity is zero. Compared to the ESP 10 S gun, it operates with lower speeds and consequently longer welding
times. By changing the spring force the welding time can also be altered here.
During the welding process there is a peak electricity flow of up to 10000 A. It is urgently recommended that
only the welding and earthing cables supplied as part of the scope of delivery are used. Welding cable exten-
sions lead to a pronounced drop in voltage, a reduction of the welding current and possibly to an increase in
welding time. Damage to the power source due to too high inductivity of the welding circuit cannot be ruled out.
2.4 Technical Data of KÖCO Welding Guns
Technical data
ESP 1 S
(gap welding)
ESP 1 K
(contact welding)
ESP 1 ISO
(for cup head pins)
tip ignition stud welding - welding range Ø
(mm)
2 - 8
2 - 10
2 - 4
welding range stud length (mm)
8 to 40, longer studs
may also be used with
spacer ring or spacer
bolts (q.v. 12.1.1)
8 to 40, longer
studs may also be
used with spacer
ring or spacer
bolts (q.v. 12.1.1)
Up to app. 100
standard support via ... legs
3
3
n. a.
welding cable (m/mm
2
)
4/25
4/25
10/6
welding cable plug (mm
2
)
50
50
50
control cable (m/mm
2
)
4/4 x 0.75
4/2 x 0.75
4/2 x 0.75
length (excluding chuck) (mm)
165
165
150
body diameter app. (mm)
40
40
50
height (including handle) (mm)
130
130
180
weight without connection cable app. (kg)
0.730
0.635
0.7
Issue 4/2019 ver. 2.0 page 11 of 42
Köster & Co. GmbH • D-58256 Ennepetal • Spreeler Weg 32 • Tel. +49 2333 8306-0 • Fax +49 2333 8306-38
Internet: http://www.koeco.net • E-Mail: koeco@koeco.net