7
Start-up and weld quality check
Page 33
Stud welding unit
operating manual
Date:
July 2021
ALPHA 850
07.2021 / EN
Rev.:
A
7
Start-up and weld quality check
7.1 Notes about stud welding
Before welding starts, the stud welding instructions must be followed.
They contain important information for achieving good weld joints.
1.
The weld elements and workpieces must be suitable for welding. Use only material
combinations indicated in the operating manual.
2.
The welding zone should be even and metallically blank Note that roughness
greater than 80 µm in the welding zone should not be exceeded.
3.
Contaminations of the welding zone, such as rust, scale, paint, moisture, greases
and oils must be carefully removed before welding. Anodized workpiece surfaces
must be stripped with caustic soda.
4.
Workpieces made of aluminium or workpieces with aluminium coating must be
cleaned only with a rust-free wire brush.
5.
Make sure the workpiece is placed free of vibration (especially important for large
and thin-walled workpieces).
6.
Solvents that contain chlorine absolutely must be removed from the welding zone.
They are not to be exposed to arc radiation.
7.
Impairments to weld quality due to arc blow can be prevented with symmetrical
attachment of earthing tongs.
8.
Always lay the welding and earth cable without loops. This can largely prevent
electromagnetic influences.
9.
Check the setting values required for your welding task*
)
on the ALPHA 850
welding device and on the connected gun.
10.
During the welding process, the position of the gun and welding process are not to
be changed.
11.
Welding on one workpiece with more than one welding device must be avoided
(electrical hazard from high open-circuit voltage).
12.
If welding on one workpiece with more than one welding device cannot be avoided,
the welds must be alternated in time.
13.
Shielding gas welding should preferably be done with the following gas mixture:
Argon 82% and CO
2
18%.
*
)
To make sure the setting parameters are correct, always do some test welds before
starting work. The quality of the weld results must be checked.
