HW0482309
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2.7
Consolidation of Ambient Condition
(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
countermeasures 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 welder
(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
ventilation 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. On the other hand, use numbers 10 to 13 for welding of medium-thick
plates since the arc is bright. For MAG welding, for which stronger arc light is required
compared to CO2 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 welder is controlled by external control input signal or while operating the
manipulator, provide proper shade around the welding torch.
Accidental arc generation may damage eyes or burn the skin of those without proper
protection.
Wind
Object to be welded
Screen
Torch
Ventilating fan
Torch
Fig. 2-5 Shielding Wind for Welding Fig. 2-6 Example of Ventilation
