Troubleshooting Table; Welding Defects - CEA SMARTMIG T21 Manual De Instrucciones

Troubleshooting table

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

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 wind-
ing
• Wrong connection of the voltage change
connector
• Wrong connection of the voltage change
connector
• Short circuit on main transformer winding
• Defective circuit
• Fuses not high enough capacity
• Wrong connection
• Line fuses burnt out
• Circuit open on welding cables
• Variations of voltage on the line
• Section of connecting cables too small
• Loose connections
• Missing power supply phase
• Fuse interrupted
• Gearmotor broken
• Wire-guide sheath defective
• Replace
• Control and replace
• Control and replace if necessary
Cause
• Defective wire
• Insufficient gas flow
• Defective flow meter
• Frost on reducer
• 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
11
Remedy
• Check and follow the instructions for con-
nection
• Repair or replace the motor
• Check and, if necessary, replace the trans-
former
• Check and follow the instructions for con-
nection
• Check and follow the instructions for con-
nection
• Replace transformer
• Replace circuit
• Use fuses of adequate capacity for the line
absorption (see table)
• Check and follow the instructions for con-
nection
• Find the cause and replace
• Check the welding cables for breakage
• Check the line voltage with a voltmeter
• Replace with cables of adequate section
• Check connections to the power mains and
welding circuit and tighten if necessary
• Check the power mains
• Electronic control circuit defective
• Drive roller worn
• Control point worn
• Replace
• Replace
• Replace
Remedy
• Change wire
• Adjust flow
• Check flow meter
• Check preheater
• 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