Tweco 400i Transmig - Manual (Page 49)

TRANSMIG 400 i
6-9 July 18, 2008
4 Portions of the weld run do not
fuse to the surface of the metal or
edge of the joint
A Small electrodes used on
heavy cold plate
A Use larger electrodes and
preheat the plate
B Welding current is too low B Increase welding current
C Wrong electrode angle C Adjust angle so the
welding arc is directed
more into the base metal
D Travel speed of electrode is
too high
D Reduce travel speed of
electrode
E Scale or dirt on joint surface E Clean surface before
welding
Possible Cause Description Remedy
Art # A-05867_AB
Lack of inter-run fusion
Lack of side fusion,
scale dirt, small electrode,
amperage too low
Lack of root fusion
Lack of fusion caused by dirt,
electrode angle incorrect,
rate of travel too high
Figure 5-2: Example of Lack of Fusion