Troubleshooting Table; Welding Defects - CEA MAXI 405 Manuel D'instructions Et Pièces Détachées

Troubleshooting table

Problem
The line fuses burn out and
close the line circuit breaker
The line fuses burn out when
the torch button is pressed
The line fuses burn out after
working for some time
The welder does not emit current
Welding current unsteady
Welding current insufficient

Welding defects

Problem
Porosity (external or internal)
Withdrawal cracks
Lateral incisions
Excessive splashing
Cause
• Wrong connection
• Short circuit on fan motor
• Short circuit on auxiliary
transformer winding
• Wrong connection of the
voltage change connector
• Short circuit on rectifier
• Short circuit on main
transformer winding
• Fuses not high enough capacity
• Defective circuit
• Wrong connection
• Line fuses burnt out
• Variations of voltage on the line
• Section of connecting cables too small • Replace with cables of
• Section of welding cables too
small or cables too long
• Loose connections
• Missing power supply phase
Cause
• Defective wire
• Insufficient gas flow
• Defective solenoid
• Wire guide nozzle clogged
• Gas flow holes clogged
• Drafts of air
• Wire or piece dirty or rusty
• Bead too small
• Bead too concave
• Bead too penetrating
• Pass speed too high
• Current too low and voltage too high
• Voltage too high
• Wire guide nozzle clogged
• Torch tilted too much
13
Remedy
• Check and follow the
instructions for connection
• Repair or replace the motor
• Check and, if necessary,
replace the transformer
• Check and follow the
instructions for connection
• Replace rectifier
• Replace transformer
• Use fuses of adequate capacity
for the line absorption
• Replace circuit
• Check and follow the
instructions for connection
• Find the cause and replace
• Check the line voltage with a voltmeter
adequate section
• Replace with cables of
adequate section or length
• Check connections to the
power mains and welding circuit
and tighten if necessary
• Check the power mains
Remedy
• Change wire
• Adjust flow
• Check
• Clean nozzle
• Clean with jets of air
• Screen the workplace
• Replace wire or clean piece
• Increase current
• Reduce voltage
• Reduce voltage and current
• Slow down
• Increase wire speed and
reduce voltage
• Adjust voltage
• Clean nozzle
• Tilt correctly