Welding Machine Maintenance Course
1. Common Faults of AC Electric Welding Machines and Their Troubleshooting Methods
Fault phenomenon 1: Welding current size
Cause of failure: Welding cable is too long; Large, the welding cable is not in good contact with the terminal. ???
Remedy: reduce the length of the cable or increase the covered area of the cable core; straighten the cable as far as possible so that it does not bend; make the electrical grade wire in good contact with the terminal.
Symptoms2: Electric welding machine shell is live
Cause of failure: one or two The wire is touching the shell; the power cord is touching the shell; the welding cable is touching; the casing is poorly grounded or not grounded.
?Remedy: Eliminate the phenomenon of bumping the shell, connect the ground wire well, and ground the shell well.
Symptoms3:During the welding process, the movable iron core has a strong vibration sound strong>
Cause of failure: The brake screw or spring of the movable iron core is loose; the moving mechanism of the iron core is damaged.
Exclusion method: Tighten the brake screw or adjust the tension of the spring; repair the moving mechanism of the iron:.
Symptoms4: During the welding process, the current fluctuates up and down
Fault Reason: poor contact between welding cable and terminal; movable iron; moving with the vibration of the welding machine.
Remedy: keep the cable in good contact with the terminal; fix the iron core to eliminate the movement of the iron core.
Symptoms5: Welder overheated
Cause of failure: Welder is overloaded; The voltage iIF} coil is short-circuited; the core screw insulation is damaged.
Exclusion method: reduce the current; eliminate the short circuit, rewind the circle; restore the insulation.
Second, Common faults and troubleshooting methods of rotary DC welding machine
Fault phenomenon 1: The welder is overheating.
Causes of failure: overload of electric welding machine; short circuit of stator or rotor wire of generator or short circuit of commutator; surface of commutator is not clean.
Remedy: reduce the current used; eliminate the short-circuit phenomenon, including rewinding the coil; clean the surface of the commutator.
Symptoms2: During welding, the current is unstable
Cause of failure: welding Poor connection of cables and terminals; movable parts of current regulators move with the vibration of the welder. ??
Remedy: fix the cable and the terminal to make good contact, and eliminate the phenomenon of movement.
Symptoms3: After starting, the brushes sparked
Cause of failure: electric Poor contact between brushes and commutators or stuck or loose brushes; mica protruding between commutators.
Remedy: Clean the contact surface or adjust the brush pressure to normal; remove the protruding mica and make it 1mm lower than the commutator.
Symptoms4: Low RPM and buzzing after startup
Cause of failure : One of the three-phase wires is open circuit or the motor stator wire is disconnected.
Remedy: Repair: Phase wires; solder or rewind coil.
Symptoms5: Motor reverse rotation
Cause of failure: wrong motor wiring.
Remedy: Connect any two of the three power cords to each other.
Three. Common faults of rectifier DC welding machine and their troubleshooting methods
Fault phenomenon1 : The shell of the electric welding machine is charged
The cause of the fault: the power line touches the shell; the transformer, reactor, control circuit, etc. touch the shell; the grounding is poor or not grounded.
Remedy: Eliminate the shell collision phenomenon; connect the ground wire well.
Symptoms2: When welding, the voltage suddenly drops
Cause of failure: main circuit The arm is short-circuited or the rectifier element is broken down; the control circuit is disconnected.
Remedy: replace the components to repair the circuit, and check the protection circuit; overhaul the control circuit and repair it.
Symptoms3: Fan motor does not rotate
Cause of failure: blown fuse; The motor winding is disconnected or the button switch sampan is in poor contact.
Remedy: replace fuse; resolder or rewind coil winding; repair or replace push button switch.
Symptoms4: Welding current is unstable
Cause of failure: AC contact of main circuit The device is short-circuited or the air pressure switch is short-circuited; the control winding is in poor contact.
Remedy: Eliminate the short circuit; make the control winding in good contact.
Declare: The above methods are derived from the program system index or shared by netizens. They are for your reference only and do not represent the research views of this website. sex and authority.
