REHM 150 3310, Руководство по эксплуатации

Страница: 26 / 64

Description of function
26
3.3.15 Stick-electrode welding with the Booster-Function
The setting for Booster function is performed as described in section 3.1. In the
Booster mode the mains current monitoring function is deactivated, and the
machine always welds with the welding current set (I1), which is on the TIGER
170 150 A and the TIGER 210 170 A. If a higher value is set, then the machine
automatically reduces this to 150 A or 170 A respectively.
When stick welding, improved ignition and a more stable arc can be achieved by
fine tuning of the settings for Hot-start and Arc-force (see chapters 3.3.18.7 and
3.3.18.8)
3.3.16 Stick-electrode welding in the Fuse Hold mode
The setting for Fuse Hold function is performed as described in section 3.1. In
this mode of operation, the actual current drawn from the mains is continuously
monitored. If necessary, the welding current is reduced to the level required to
prevent the mains fuse form tripping out. A fast acting circuit breaker Type L,
similar to the type normally installed in households should be installed in the
mains supply cabinet as the Fuse Hold function is designed for use in
conjunction with this type of circuit breaker.
The machine is designed for use with all the common types of stick-electrodes.
The maximum current on the Tiger 170 is 140 A, and on the Tiger 210 is 160 A. If
a higher current is set, the current is automatically limited to 140 A or 160A
respectively.
This current enables the welding of standard electrodes up to 3.25mm to be used
The polarity of the electrode can be obtained from the manufacturers data sheet.
If there is a permanent short circuit between the electrode and the workpiece
during welding, the Anti-Stick Function is automatically activated after approx.
1.3s. This function automatically limits the welding current to approx. 35 A. This
prevents the electrode from overheating and burning out. The operator
terminates the short circuit simply by removing the contact between the electrode
and the workpiece.
When stick welding, improved ignition and a more stable arc can be achieved by
fine tuning of the settings for Hot-start and Arc-force (see chapters 3.3.18.7 and
3.3.18.8)
3.3.17 TIG - welding
The setting for TIG welding is performed as described in section 3.1. It is
possible to weld with up to 170 A on the TIGER 170, and up to 210 A on the
TIGER 210. The mains current monitoring is deactivated in the TIG welding
mode. Even though the welding current is higher, the load on the mains supply is
lower than by stick-electrode welding, therefore the chances of the mains fuse
tripping are greatly reduced.
When TIG welding the arc is established between the end of the non-
consumable Tungsten electrode and the workpiece. An inert shielding gas
protects the electrode and the weld pool and prevents them from oxidising during
the welding process. The usual selection of gas is pure Argon, however Helium
and other mixtures can also be used depending upon the application.
The negative pole of the power source is connected to the torch, and the positive
pole to the workpiece. The tungsten electrode is the current conductor and
sustains the arc (non-consumable). The filler material is usually introduced into
the weld pool by hand, in the form of a rod, or by a separate cold wire feed unit,
in the from of a wire. The tungsten electrode and the molten pool, as well as the
molten end of the filler material, are protected from the atmosphere by the inert