CHENGDU HUAYUAN ELECTRIC EQUIPMENT CO.,LTD
LGK-100.160.200
16
Nozzle select
The three main dimension of nozzle are the diameter of nozzleφ
, the
hole length
ι
and the compact angle
α
,
can affect the cutting. It should be
a dimension of the hole length and the diameter, the value is usually
lower than 2, it usually take
, the compact angle usually take
α
＝
30
°～
60
°, and now it usually takeα＝
30
°
Cutting current and arc voltage
The cutting current should be according to the diameter of the nozzle, the
relationship between the two should be as: I
（
current A
）＝（
7
0～100）×φ（
mm
）
.
As the increasing of the metal thickness, the arc current affection for the cutting
speed will become less. But the more increasing of the current, the more burnt
damage will happen for the electrode and the nozzle. So when cutting the metal
work-piece with large thickness, it usually increase the speed through the arc voltage
increasing. The actual arc voltage is decided not only by the air but also by the air
current and nozzle shape. The more air current is, the more voltage will increase.
Air current Q
The arc voltage will increase as the air current increase, that is if the power
increase, the speed will be quicker, so as the cutting capacity and quality. Because if
the arc compact increase, the energy will be more concentrate, the arc temperature
will increase rapidly, and the spray speed will increase, as well as the arc current
capacity. But large current may cause the unstable of the plasma arc. The air current
will be stable for one torch under the usual circumstance. It can be adjust a little
when the cutting thickness is large.
The distance between the nozzle and the work-piece (d)
If the d is too high, the power of plasma for metal melting will be
decrease, so as the cutting ability, the prick on the button will increase,
and the unstably of the arc will increase. However, if the d is too small,
the short current between the nozzle and the work-piece will increase,
usually ensure there is no short current, we take d as small as possible.
The cutting thickness for air plasma is 2～5mm, the work-piece can also
contact with the nozzle, that is the nozzle glide on the surface of the
work-piece. This cutting method is called contact cutting, the cutting
thickness is the half as the ordinary cutting.
no-load voltage
It needs power source with high no-load voltage when cutting material with
large thickness, the no-load voltage is related with air, for example, using argon gas,
the voltage may lower, while using air.
cutting speed
The cutting speed is related with many parameter, the main parameter is the
cutting thickness, current, air current and nozzle diameter. There maybe a little spare
space to ensure the cutting quality and speed.
2.
diminish the cutting prink
the characteristic of the cutting prink
The ordinary cutting surface is smooth and beautiful, but if the parameter not
