- Where the ambient air contains high concentrations of inflammable vapours,
combustible gases or dust, cutting work may only be performed if the area is
properly ventilated.
- If hydrogen is used or is present, it should be noted that it is an inflammable
gas and that there is a potential danger of explosion.
- If aluminium is cut underwater or directly on water, the high temperature of
the plasma can trigger decomposition of the water into oxygen and hydrogen.
The combination of oxygen with hot aluminium can result in dangerously high
concentrations of the remaining hydrogen. This concentration of hydrogen
can be avoided by using suitably designed air agitation units on the table
bottom.
- Only use pressure regulators that are in good condition and only for the
gases for which they are intended. Never lubricate pressure regulators with
grease or oil.
6.5 Ventilation
- During cutting work, poisonous gases can be given off as a result of melting
of the material. Wear protective masks!
- Workstations must be designed taking into account the methods, materials
and conditions of use, so that the air inhaled by the user can be kept free of
substances harmful to health (see VBG 15, 4 and 29).
- Take care to ensure that the cutting area is ventilated either by natural
ventilation or by appropriate technical devices.
- Do not perform any cutting work on workpieces that are painted or treated
with degreasing agents, which can cause poisonous vapours to be given off.
The material to be cut must be cleaned of any solvent or degreasing agent.
- Solvents containing chlorine or materials containing lead, graphite cadmium,
zinc, mercury or beryllium or are coated with these can give off poisonous
fumes that could be a health hazard.
6.6 Checks before switching on
It is assumed that:
- the unit was set up properly in accordance with Chapter 5,
Commissioning;
- all connections (shielding gas, torch connection) were established in the
proper fashion in accordance with Chapter 5, Commissioning;
- maintenance work has been carried out at the due intervals Chapter 8,
Maintenance;
- the safety devices and equipment components (especially the torch
connection hoses) have been checked by the operator and are in proper
working order;
- the operator and other persons involved have put on the appropriate
protective clothing, and the working area has been shielded so that no
bystanders are at risk.
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