1
Introduction
Page 2
Stud welding unit
operating manual
Date:
July 2021
ALPHA 850
07.2021 / EN
Rev.:
A
1.2 Device description
The ALPHA 850 is a powerful welding device developed by Tucker for stud welding
according to the
drawn arc
process and
short cycle
drawn arc process.
Depending on the welding task, the ALPHA 850 can be configured with manually
loaded welding guns (standard operation) or automatic guns and sorting (automatic
mode).
The standard version of the ALPHA 850 has a 4-pin control cable socket.
When an automatic gun and a sorter of type NSA 606 M-NON AUTO “manual mode”
are connected, the studs are fed automatically. In this case, the welding device’s
control cable socket has 7 pins.
Information on safe, proper handling of the sorters and pistols can be found in the
specific device’s operating manual.
The ALPHA 850 works based on a fully controlled thyristor copper bar and delivers
constant welding currents up to 850 A. The AC grid power supply is transformed
through a transformer and then rectified.
The entire weld cycle is coordinated by the ALPHA 850’s control unit and can be
monitored with the LED display elements.
The welding current needed for stud welding and the weld times must be set on the
relevant potentiometers.
To keep the ALPHA 850’s temperature level as low as possible, the welding device
had a permanently controlled fan.
The stud welding process is selected according to the welding task and is set on the
welding device’s operating mode selector switch.
According to the short cycle process, SC studs with a weld diameter of 3 to 9 mm can
easily be welded without a weld pool guard.
The drawn arc process allows welding of ordinary commercial studs with a weld
diameter of 3 to 12 mm. To weld according to the drawn arc process, a weld pool
guard is necessary.
For protecting the weld pool, it is preferable to use ceramic rings or perform welding
under shielding gas (optional).
