Welding Method; Mma Welding - Fimer TT 162HF Bedienungsanleitung

Attention: The cylinders contain highly
pressurised gas. Handle with care.
Improper handling could lead to serious
accidents. Do not place the cylinders on
top of each other and do not expose to
excessive heat, flames or sparks. Do not
allow the cylinders to strike against each
other. Contact your gas supplier for
more information on the use and han-
dling of the cylinders.
Attention: Do not use the cylinder if you
find oil leaks, grease or damaged parts.
Immediately contact your gas supplier if
these conditions exist.
6.

WELDING METHOD

Select the correct welding method by
repeatedly pressing button 5 shown in
Figure 1 and check that the correct weld-
ing procedure is activated, e.g. MMA
(LED 17), Normal TIG (LED 16) and
Pulsed TIG (where provided) (LED 15).
6.1 MMA WELDING (Fig.1: LED 17
turned on)
Activate this operating mode by
repeatedly pressing button 5 in Fig.1
until LED 17 lights up.
6.1.1 Description
Electrical arc welding with MMA coated
electrode (Metal Manual Arc) or SMAW
(Shielded Metal Arc Welding) is a manu-
al welding procedure which exploits the
heat generated by the electric arc that is
Fig. 3
struck between a coated fusible elec-
trode and the pieces to be welded.
This procedure is commonly used in
welding because of its versatility. In fact,
it allows creating joints in any position:
in the machine stop, outdoors, in con-
fined areas or hard to access areas. A
vast range of electrodes are available
on the market for meeting the most var-
ied requirements. The striking of the arc
occurs by bringing the electrode close to
the workpiece.
The potentiometer (4 of figure 1) allows
regulating the welding current (thicker
welding pieces require higher welding
currents).
6.1.2 Functions active during MMA
welding
The following functions are active during
welding:
Arc Force: Each time the arc tends to
interrupt itself, the microprocessor of the
welding machine automatically increas-
es the welding current in order to restore
the correct arc and keep it correctly
struck.
Hot Start: The arc strikes when the
electrode touches the workpiece. In
order to facilitate the correct starting,
the welder 's microprocessor sees to
increasing the value of the welding
current for around one second. This
guarantees a safe and quick striking
of the arc.
A n t i - s t i c k i n g :
This function
cancels the out-
put current if
the operator
makes a mis-
take and sticks
the electrode to
the piece; this
allows remov-
ing the elec-
trode from the
holder without
causing flare
ups which may
damage it.
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