C
HECK
BEFORE
W
ELDING
W
ELDING
O
PERATION
C
HAPTER
5
5-2
5.1.2
Precaution for protective equipment
For protection from arc ray generated from welding, spatter and spattering dross and hearing disorder
from noise, observe the following:
5.1.3
Precautions on welding place
To avoid poor welding, ensure to follow the instructions below:
5.2 Check before Welding
This section explains the check parameters before welding. To avoid welding problems beforehand,
check the parameters below when the welding environments are prepared. (These are the check
parameters recommended by OTC. They also contain check parameters after power ON or after shield
gas supply.)
For handling the cooling water circulation device, refer to the instruction manual of the cooling water
circulation device. (When using the water-cooled welding torch)
• Wear safety goggles with sufficient blocking effect or face shield in the work area and
the surrounding.
Ignoring the above may cause inflammation and burn from arc ray.
• Wear safety goggles in the work area and the surrounding.
Ignoring the above may cause injury in the eye or burn from spatter and spattering
dross.
• Wear protective equipment such as protective leather gloves, long-sleeve clothes, leg
covers, and leather apron.
Ignoring the above may cause electrical shock and burn.
• Install protective screens or barriers to protect the eyes of others in the work area from
arc ray.
• Wear an ear protector when noise level is high.
Ignoring the above may cause hearing disorder.
• When the welding is performed outside with wind or when wind is caused by the indoor
ventilation facility (including fan), provide a partition to avoid the arc generating part
being exposed to wind.
Check parameter
Countermeasures
Check
1
There should be no loose connections of the
cables.
Use a proper tool to ensure connection.
2
There should be no dirt such as oil or
spatter adhering on the connection
terminals or connection part of cables.
Wipe off dirt so that the metal face of connection terminal or connection
part is fully exposed. Using a metal brush is effective.
3
There should be no tightening together of
the voltage detection cable (base metal
side) and the cable at the base metal side.
Connect the voltage detection cable (base metal side) and the cable at the
base metal side separately to a different location.
Each cable should be connected to the position near to the workpiece to
be welded.
