GF Welding Weld334m - Hazards Associated with Resistance Welding Machines

Weld334m - User’s manual
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1.1 Hazards associated with the use of resistance welding machines
Because of the presence of electric current and live parts in the machine, mounting,
maintenance work and replacement of genuine parts is only to be entrusted to Qualified
Personnel (electricians or authorised personnel). All work undertaken is to be done in safety
conditions. The non-observance of these requirements can cause death, injury to persons
or damage to machine and property.
1.1.1 ! Prohibitions
•
It is prohibited to work on the live installation.
•
It is prohibited to remove by-pass and modify the safety devices as this could cause
serious risks to personnel and equipment and could lead to death.
1.1.2 ! Conditions to be respected to reduce the hazard
•
Always insure that the electric switchboard main switch is OFF.
•
Work on the machine, equipment and the welding transformer only after breaking
the connection from the mains. This to be sure that no undesired switching of
electrical current occurs.
•
Work on the spotgun and welding cable connections only after breaking the
connection from the mains power.
1.1.3 ! Causes of hazard
•
The programming of the welding control is entrusted only to qualified personnel.
Incorrect parameter settings may cause damage or injury because of undesired
molten material splashes during welding.
•
It is compulsory to wear protective goggles, non-flammable clothes and protective
shoes.
•
Dangerous conditions may arise when, for example, electrodes are changed or
dressed and no current re-adaptation/re-setting takes place, especially when using
the stepper function (stepper reset).
•
If 24V power supply is external to the machine or the control device, power may be
applied to the equipment even if the main switch connection is broken.
•
During mounting, setting of work, maintenance and/or repair operations, hazards
may occur because of the exchange of leads, air/water pipes, etc…
•
Unqualified personnel may be unaware of the risk that such changes/modifications
entail, therefore, all changes/modifications are only to be entrusted to and/or
performed by qualified personnel.
•
Hazardous situations may arise because of mains voltage drops, or in case of tripping
of the machine emergency stop device, which causes the return to rest position of
the pneumatic valves in use during the operation (this situation affects the whole
plant).
•
If during the welding process the cooling water flow is low or non-existent, it is
prohibited to bypass or inhibit the tripping of thermostats or the water flow control
device (if installed).