Operating the Machine in MIG mode
Once you have set machine up as per above instructions.
1. Select welding voltage (power) required on front panel
2. Select wire feed speed required on ‘wire speed’ knob
3. Ensure you are wearing the correct safety clothes & equipment for welding (I.E
Welding mask, gloves, apron etc)
4. Press torch trigger to start welding process and adjust welding current knob to adjust
wire feed accordingly.
5. The LED display will show actual welding amperage when welding (Display will show
000 when not welding)
Note: You can finely adjust the welding current knob to fine tune weld arc length to either
DIP or SPRAY welding DIP is when the wire is melting very close to the workpiece (Short
arc length), SPRAY is when the wire is melting far away from workpiece (Long arc
length)
1. Tips on welding aluminium
When welding aluminium as the wire is much softer than steel wire you have to fit
a Teflon liner in place of the steel liner in MIG torch, this is so the wire feeds
much smoother and stops it snarling at rollers.
To fit a Teflon liner, remove steel liner from torch and fit Teflon liner so you have
about 10 inches left coming out end of MIG torch at the machine end. In the brass
euro body where torch fits onto you will see a brass guide tube, remove this tube
(you will have to remove circlip to allow this) and fit torch to machine and cut off
excess Teflon liner as required.
You want the Teflon liner to get as close to the wire feed rollers as possible. Best
way to cut liner is with a sharp knife blade. Adjust the wire tensioner to minimum
pressure and tighten down until wire is gripped, too much pressure will deform
wire and end up with snarls by rollers.
The
PRO-MIG250
is fitted with rollers for steel wire as standard. Fit U-Groove
rollers for alloys and oversize welding tip. These are available and have and ‘A’
after tip size. I.E 0.8A where as for steel wire it would just say 0.8
2. Tips on using gasless wire
When using gasless wire you have to change the polarity of the arc. This can be
done simply by reversing the cables inside wire feed cabinet
Gas wire = Positive torch – Negative work (machine is set as standard)
Gasless wire = Negative torch – Positive earth
