Selco GENESIS 145, Руководство по ремонту

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Connection for TIG welding (Fig. 4)
- Separately connect the torch gas pipe connector to the gas distri-
bution.
The protection gas flow is adjusted using the tap
normally located on the torch.
5.6) PROBLEMS - CAUSES
5.6.1 Possible faults in the MMA welding
Fault Cause
Excessive spatter 1) Long arc
) High current
Craters 1) Fast movement of the electro-
de away from piece.
Inclusions 1) Poor cleanliness or distribu-
tion of the passes
) Defective movement of the
electrode
Insufficient penetration 1) High progression speed
) Welding current too low
3) Narrow chamfering
4) Deseaming failure on top
Sticking 1) Arc too short
) Current too low
Blow-hole and porosity 1) Humidity in electrode
) Long arc
Cracks 1) Current too high
) Dirty materials
3) Hydrogen in weld (present
on electrode coating)
5.6.2 Possible faults in the TIG welding
Fault Cause
Oxidations 1) lnsufficient gas.
) No protection on the rever-
se.
Tungsten inclusion 1) lncorrect electrode sharpe-
ning.
) Electrode too small.
3) Operating failure (contact of
the tip with the workpiece).
Porosity 1) Dirt on the edges.
) Dirt on the filler material.
3) High advancement speed.
4) Current intensity too low.
Hot cracks 1) Unsuitable filler material.
) High heat supply.
3) Dirty materials.
5.6.3 Possible electrical failures
Fault Cause
Machine fails to come on
(Green LED off)
1) No current in the power soc-
ket
) Faulty supply plug or cable
3) Internal fuse blown
Power output incorrect
(Green LED on)
1) MMA/TIG selector switch in
incorrect position or faulty
) Low mains supply voltage
3) Faulty current control poten-
tiometer
Absence of output current
(Green LED on)
1) Equipment overheated (yel-
low LED on). With welder
on, wait for it to cool.