Hilti FX 3-A Operating Instructions Manual page 16

3.2 Product overview, hand tool
3.3 Overview, system components
3.4 Intended use
The product described is a cordless stud welding machine. It is designed for welding F­BT studs to steel on
the principle of drawn-arc welding.
• Use only Hilti chargers of the C 53 series. More information is available from your Hilti Store or from
www.hilti.group
• Observe the operating instructions and other documents for the studs, the inert-gas can and all other
system components used.
3.5 Cordless Stud Fusion technology
The Cordless Stud Fusion (CSF) technology is based on the principle of stud welding by drawn arc.
This welding process consists of several phases. The sequencing of the individual welding phases is fully
automated and requires no additional control intervention by the user.
The five phases of the welding operation:
1. In the first phase, the inert-gas atmosphere is created. Inert gas flows to the front part of the hand tool,
where it displaces the atmospheric air.
2. Current flows through the stud to the base metal, while at the same time the stud is lifted in a controlled
movement until there is a gap of defined size between it and the base metal. This produces a stable pilot
arc, initially of low power. In this phase there is no appreciable melting of stud or base metal.
3. The power of the arc is surged to maximum, with current flux now automatically increased to the target
value. The power of the arc is now sufficient to melt the tip of the stud and the base metal.
4. Welding is completed by the system. The stud is moved toward the base metal. Molten material from
base metal and stud mix.
5. The stud is briefly held in this position and the molten metal hardens. More inert gas flows round the
weld, protecting against oxidation.
3.6 AFI (Active Fusion Indicator)
The welding machine assists the user in carrying out the welding process correctly, increasing the achievable
quality of the weld. The achievable quality of a weld depends on many influencing factors.
6 English
2
Stud holder
@
Shielding ring
;
Belt hook
=
Trigger
%
Support leg
&
Eye for attaching the tool tether
(
Control connector
)
Current connector (-)
+
AFI (Active Fusion Indicator)
§
Fault indicator
/
OK button
:
3
C 53 charger
@
Welding machine FX 3­A
;
Inert-gas can FX 3­GC
=
FX 3­HT hand tool, with lines
%
Ground lead
&
Cable clamp
(
Magnetic foot
)
Cordless drill / driver Hilti SF 8M­A22
+
Surfacing tool
§
Setting tool for sealing washer
/
2302420
*2302420*