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10 The cutting technique and condition (continue)
10.2 Non-contact cutting
WARNING
Do not touch the electrically charged section to prevent electrical shocks and burnt.
·
During cutting do not touch cutting tip and electrode of the cutting torch end.
※
Please avoid unnecessary operation of the cutting torch switch, otherwise the consumption of the
electrode can be accelerated by generating arc without base metal.
Cutting
start
·
Keep the cutting tip end away
from the base metal 4mm
～
5mm or
so.
·
When cutting tip end centre and
the surface of the base metal end
are on same level position, turn on
the cutting torch switch
Reference
·
The finger gear takes the
function of reference guidance.
·
Regarding the selection of
finger gear, please refer to the
operational manual of the cutting
torch.
·
The status can transfer to plasma
arc after pilot arc is generated.
·
Start cutting until plasma arc and
base metal thickness vertical and
stop
During
cutting
·
Keep the cutting torch as vertical
as possible.
·
Keep cutting speed and constant
distance between the cutting tip
and base metal
Cutting
finishes
·
When the cutting torch reaches
around 10mm ahead of base metal
end,
keep
the
cutting
torch
horizontal or inclining 5
°
.
·
move the cutting torch until the
back of base metal is cut off
completely.
·
After the back of base metal is
cut off completely, release the
cutting torch switch.
At the moment of the end of
cutting, if cutting tip side touches
with the base metal, the strong
arc can be generated, causing
the cutting tip burning loss.
Base
metal
10mm
5
°
Base
metal
Cutting
tip
Base
metal
Plasma
arc
Base
metal
