15
size, size of run required and the amperage used.
Excessive travel speeds lead to poor fusion, lack of
penetration etc, while too slow a rate of travel will
frequently lead to arc instability, slag inclusions
and poor mechanical properties.
Correct work preparation
The method of preparation of components to
be welded will depend on equipment available
and relative costs. Methods may include sawing,
punching, shearing, machining, flame cutting
and others.
In all cases edges should be prepared for the joints
that suit the application.
Generally Recommended Current Range
for MMA electrodes
Size of Electrode (mm) Current Range (Amp)
2.5
60–95
3.2
110–130
4.0
140–165
