7
Start-up and weld quality check
Page 42
Stud welding unit
operating manual
Date:
July 2021
ALPHA 850
07.2021 / EN
Rev.:
A
Warning:
•
During the welding process, touchable parts such as studs, stud
holder, loading head and all electrically connected parts carry current.
These components must not be touched during the welding process!
13.
Press the gun with both hands as vertically as possible (90°) to the workpiece.
14.
Hold the gun still and press the start button. The “Start weld cycle” LED is on as
long as the start button is pressed.
15.
For welding with shielding gas, the shielding gas feed is activated for the duration
of the pre-set pre-flow time.
16.
After the shielding gas pre-flow time is over, a pilot current flows through the
external welding circuit “Welding cable - Stud - Workpiece - Earth cable”.
17.
The gun coil activates and lifts the stud from the workpiece surface. The “Contact”
LED goes out.
18.
After the pre-flow time is over, the main welding current is shut off. When the weld
time ends, the solenoid actuator is depowered.
19.
The stud dips into the melt bath, the arc goes out, and the weld current is switched
off.
20.
For shielding gas welding, a fixed activated post-flow time is activated.
21.
Pull the welding gun as straight as possible off the stud.
22.
Before the welding gun is used for series production, the quality of the weld joint
must be checked (see Chapter 7.5).
23.
To make sure the weld parameters are correct, always do some test welds before
starting work.
24.
If the weld results are poor, optimize the weld parameters.
The test welds must be repeated until the optimal weld quality can be achieved.
