2.8 Ambient Environment
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HW0480311
HW0480311
2.8
Ambient Environment
1.
Wind Prevention
Normally, the allowable wind limit for welding using shielding gas is approx. 1.5 m/s or
less. If the wind speed is higher than this limit, stop operation or take some counter-
measures such as putting up a screen.
Even for indoor operations, sufficient attention to the shield effect must be paid when
using air tools or fans around the welding.
2.
Ventilation
The carbon dioxide gas used as the shielding gas is decomposed by arc heating, and a
small amount of carbon monoxide is generated.
For operations indoor or in a container or a tank, ventilation is needed. In this case, do
not use a fan to blow the air, but ventilate the accumulated gas by providing a ventila-
tion fan or exhaust duct.
3.
Shading Measures
For shaded glasses of helmets or hand shields, use filter numbers 8 to 10 of JIS T8141
for welding of thin plates since it has a weak arc beam and the arc must be seen easily.
Use numbers 10 to 13 for welding of medium-hick plates since the arc is bright. For
MAG welding, for which stronger arc light is required compared to CO
2
welding, use
greater filter numbers.
The welder brings in ultraviolet rays stronger than that caused by manual welding.
Periodically check protectors for eyes and the skin. Also, be sure to always wear these
protectors.
When the welding source is controlled by external control input signal or while operat-
ing the manipulator, provided proper shade around the welding torch.
Accidental arc generation may damage eyes or burn the skin of those without proper
protection.
Fig. 6 Shielding Wind for Welding
Fig. 7 Ventilation Example
Wind
Screen
Torch
Object to be welded
Torch
Ventilating fan
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