Table of Contents
Advertisement
1.15 Repair methods
Melting
I
The weld may melt in the event of excessive weld currents or
inadequate edge preparation (Fig. I).
Application error ('I' shaped bead)
Application errors occur when the filling material runs into the
gap and when a weld is applied on top of another newly applied
bead that has not yet solidified.
The root must be perfectly welded. Slightly bevelling the inner
side of the sheet flanges improves the influx of the root.
Application errors consist of material separation cracks with a
high penetration effect, which compromise the strength of the
weld itself.
Soot deposits
In event of an excessively small torch angle or incorrect welding
J
torch movements (such as when welding forward), significant
soot deposits may be formed in certain conditions (Fig. J).
Other causes of this phenomenon may be an insufficient
quantity of inert gas or inadequate cleaning of the welding
flanges.
When working with magnesium based aluminium alloys, small
soot deposits are practically unavoidable.
Copyright ©
2010
Advertisement
Table of Contents
