Welding Discontinuities And Defects; Emc - Helvi READY MIG 100 Manual De Uso

14.0 WELDING DISCONTINUITIES AND DEFECTS

1. Defect: The wire pushes the torch back from the workpiece.
Cause: Excessive wire speed.
2. Defect: The wire sticks on the contact tip.
Cause: Low wire feeding.
3. Defect: Excessive welding spatters
Cause: Erratic wire feeding, improper torch position (too
4. Defect: Arc is unstable
Cause: Low voltage, erratic wire feeding.
5. Defect: Inadequate penetration.
Cause: Welding current too low, excessive travel speed, torch
6. Defect: Cracking
Cause: Base material dirty, welding current too low, excessive welding voltage, rust on the electrode wire.

EMC

Before installing the unity, carry out an inspection of the surrounding area, observing the following guide-lines:
1. Make sure that there are no other power supply cables, control lines, telephone leads or other equipment near the
unit.
2. Make sure that there are no radio receivers or television appliances.
3. Make sure there are no computers or other control systems.
4. Make sure there are no -one with a pacemaker or hearing aid in the area around the unit.
5. Check the immunity of any other equipment operating in the same environment. In certain cases additional protective
measures may be required.
Interference can be reduced in the following ways:
1. If there is interference in the power supply line, an E.M.C. fi lter should be inserted between the mains and the unit.
2. The output cables of the unit should be shortened; these should be kept close together and stretched along the
ground.
3. All the panels of the unit should be correctly closed after carrying out maintenance.
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inclined)
travel direction should be reversed.