Publicité
Les langues disponibles
Les langues disponibles
CAUTION: Please note that the torch must always be placed on an insulated surface after welding.
Always switch off the welder after completing welding work and during breaks and pull the plug
„
from the mains socket.
z Creating a weld seam
Forehand welding
Push the torch forwards. Result: The penetration depth is lower, broader weld width, flatter weld bead
(visible surface of the seam) and greater fusion error tolerance.
Backhand welding
The torch is dragged from the weld seam (Fig. U). Result: Greater penetration depth, narrower weld
width, higher weld bead and lower fusion error tolerance.
Welded joints
There are two-basic types of joints in welding: Butt welds (outer edge) and angle welding (inner edge
and overlapping).
Butt welds
With butt welds of up to 2 mm material thickness, the weld edges are completely brought together.
For greater thicknesses, a gap of 0.5–4 mm must be selected. The ideal gap depends on the welded
material (aluminium or steel), the material composition as well as the type of welding selected.
This gap should be determined by welding on a sample workpiece.
Flat butt welds
Welds should be made without interruption and with a sufficient penetration depth.
Therefore, it is extremely important to be well prepared. The quality of the weld result is affected by:
the amperage, the gap between weld edges, the inclination of the torch and the diameter of the welding
wire. The steeper you hold the torch against the workpiece, the higher the penetration depth and vice
versa.
U
To forestall or reduce deformations that can happen during the material hardening process, it is good
to fix the workpiece with a device. Avoid stiffening the welded structure to prevent cracks in the weld.
These problems can be avoided if there is a possibility of turning the workpiece so that the weld can be
carried out in two passes running in opposite directions.
22
GB/IE/NI/CY/MT
Publicité
