Welding Process; Changing Setup For Different Materials - ESAB MigMaster 210 Instruction Manual

Welding Process

A factor which influences the depth
of penetration is how the welding
gun is moved during welding.
Trailing welding (welding towards
the body) increases the penetra-
tion depth.
If instead the gun is pushed away
from the body, penetration depth
is reduced.
A short arc gives a deeper
penetration.
A long arc gives shallower pene-
tration. A long arc also increases
the risk of welding spatter.
In the case of down-welding,
penetration depth is heavily
reduced and is at a minimum
in vertical down-welding. In
up-welding penetration is
deep.
Changing Set Up For Different
Materials
Stainless Steel
Stainless steel uses similar set ups as required for mild
steel. You may want to use a new steel liner to avoid
contamination from particles left behind when welding
with mild steels. The gas mixture required will be diffe-
rent and may differ according to the grade and thickness
of the stainless steel being welded. Seek advice from
your local ESAB distributor or gas supplier.
Gasless / Self shielded wires
As the name implies, no gas is required for these wires.
Mainly only used when welding outdoors where wind may
affect shielding gas coverage.
Gasless wires and some cored wires require that the
welding polarity be changed to reverse polarity.
With the reverse polarity feature, change the short lead
coming out the front of the machine from the 'positive'
gun terminal to one of the two 'negative' terminals (A or
B). The return cable should now be connected to the
positive gun terminal.
(See illustration on page 9).
Overload
The machines are fitted with thermostats which shut down
the unit should it become overheated. The LED on the
front panel will light to show that the thermostat has
tripped. The thermostats will automatically reset once
the unit has cooled.
Maintenance
Minimal maintenance is required to keep your
MigMaster 210 in good working order. Keep the drive
mechanism free of dust and dirt by regular cleaning
with a brush. Remove the covers and blow out unit
using soft, dry compressed air at least once per year.
Keep the cables and leads in good working condition
and away from grease, oil, solvents or water. Have
an electrical technican immediately replace any
damaged or worn cables. Replace the Mig gun wear
parts and lead as required due to normal usage wear
and tear.
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