
B–70114EN/04
3. INSTALLATION
75
Use the gas bottle of the volume of 7m
3
. Store the necessary number of
bottles according to the operation of the laser.
Drawing of last chapter 1 shown laser gas connection of inlet and outlet.
Inlet and outlet fittings on laser are female PT 3/8”.
(1)Gas inlet of oscillator
D Use the tube designated. (FANUC recommends the use of AS1
tube manufactured by Jyunkosha.)
Do not use a tube possessing high permeability to He. (In the worst
case, the laser will be damaged by improper gas composition.)
D Use the gas of the correct composition.
(2)Gas outlet of oscillator
The oil mist and the dissociated gas come out from the exit of the gas.
Tie the piping of 3/8 inches or more to the gas exit and put it out to
outdoor. It will load the exhaust pump when thin piping or extremely
1ong and the exhaust ability decreases occasionally.
Observe the following cautions for piping between the laser gas cylinder
and laser oscillator.
D Use nylon tube having an inside diameter of 8 mm or larger (Junlon
AS1 manufactured by Junkousha, or equivalent). Do not use a rubber
or urethane tube.
D Use a swage–lock vacuum joint (Fujikin’s product or equivalent). Do
not use a one–touch coupler, quick coupler, or hose–band joint.
D Minimize the length of tubing. It should be kept within 5 m. Never
exceed 15 m. For a length of 15 m or greater, use stainless pipe.
D If it is necessary to use metal pipe for lack of an alternative, use
stainless bright annealed pipe. Minimize the number of joints used.
Connect pipes, if necessary, using a swage–lock vacuum joint or by
TIG welding. Do NOT use silver soldering or copper piping. Piping
should be installed by a vacuum piping specialist. Do not extend metal
piping over 30 m.
D Always keep the piping materials clean. Do not allow foreign matter
to get in the pipe.
D Use a pressure reducer that is free from gas leakage.
D After installing the pipe, check it for gas leakage, using a liquid leak
checker (Gyupoflex: A98L–0001–0856, detecting bubbles caused by
leaking gas) or a clamp test
1)
.
Note
1. Open the valve of the gas cylinder to pressurize the inside
of the pipe, then close the valve. Check to see if the
pressure in the pipe becomes low with time. Monitor the
primary pressure of the gas reducer for over 8 hours. If the
gas pressure becomes lower by 10% within 8 hours, gas is
likely to be leaking. Take an appropriate measure.
3.7
LASER GAS
3.7.1
Gas Bottle
3.7.2
Laser Gas Tubing
3.7.3
Gas Pipe