Problems - Causes; Possible Faults In The Mma Welding; Possible Faults In The Tig Welding; Possible Electrical Failures - Selco Genesis 282 Instrucciones De Uso

7.0 PROBLEMS - CAUSES

7.1 Possible faults in the MMA welding

Fault
Excessive spatter
Craters
Inclusions
Insufficient penetration
Sticking
Blow-hole and porosity
Cracks

7.2 Possible faults in the TIG welding

Fault
Oxidations
Tungsten inclusions
Porosity
Hot cracks
20
Cause
1) Long arc
2) High current
1) Fast movement of the
electrode away from piece.
1) Poor cleanliness or distri-
bution of the passes
2) Defective movement of
the electrode
1) High progression speed
2) Welding current too low
3) Narrow chamfering
4) Deseaming failure on top
1) Arc too short
2) Current too low
1) Humidity in electrode
2) Long arc
1) Current too high
2) Dirty materials
3) Hydrogen in weld
(present on electrode
coating)
Cause
1) lnsufficient gas.
2) No protection on the re-
verse.
1) lncorrect electrode shar-
pening.
2) Electrode too small.
3) Operating failure (contact
of the tip with the work-
piece).
1) Dirt on the edges.
2) Dirt on the filler material.
3) High advancement speed.
4) Current intensity too low.
1) Unsuitable filler material.
2) High heat supply.
3) Dirty materials.

7.3 Possible electrical failures

Fault
Machine fails to come on
(Green LED off)
Power output incorrect
(Green LED on)
Absence of output current
(Green LED on)
If you have any doubts or problems, do not hesitate to con-
sult your nearest technical service centre.

8.0 ROUTINE MAINTENANCE

Prevent metal powder from accumulating near the aeration fins
and over them.
Disconnect the power supply before every opera-
tion!
Carry out the following periodic controls on the
power source:
* Clean the power source inside by means of low-
pressure compressed air and soft bristel brushes.
* Check the electric connections and all the connec-
tion cables.
For the use and maintenance of the pressure
reducers, consult the specific manuals.
For the maintenance or replacement of torch
componente TIG, electrode holder and/or earth
cables:
* Disconnect the power supply before every operation.
* Check the temperature of the componente and make
sure that they are not overheated.
* Always use gloves in compliance with the safety stan-
dards.
* Use suitable spanners and tools.
Cause
1) No current in the power
socket.
2) Faulty supply plug or cable.
3) Internal fuse blown.
1) MMA/TIG selector switch
in incorrect position.
2) Incorrect set-up parameters.
1) Equipment overheated
(yellow LED on).
With welder on, wait for it
to cool.
2) Power supply voltage out of
range - yellow led on.