Too Slow Travel Speed -
A too slow
travel speed produces a large weld with
lack of penetra tion and fusion. The energy
fr
om the arc dwells on top of the weld pool
rather than penetrating the base metal. This
produces a wider weld bead with more
deposited weld metal per mm than is required
resulting in a weld deposit of poor quality.
Too Slow Travel Speed
large wide bead
lack of fusion
porosity
cold lap
lack of joint penetration
Correct
Travel Speed -
The correct
travel speed keeps the arc at the leading edge
of the weld pool allowing the base metal
to
melt sufficiently
to
create
good
penetration, fusion and wetting out of the
weld pool producing a weld deposit of good
quality.
Correc t Travel Speed
even shaped bead
good side wall fusion
good toe fusion
good penetration
Wire types and sizes -
Use the correct wire
type for the base metal being welded. Use
stainless steel wire for stainless steel,
aluminium wires for alumi nium and steel
wires for steel.
Use a smaller diameter wire for thin base
metals. For thicker materials use a larger
wire diameter and larger machine, check the
recommended welding capability of you
machine. As a guide refer to the “Welding
Wire Thickness Char t” on the following page.
16
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