Hilti FX 3-A Operating Instructions Manual page 37

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.
Certain process deviations from the expected sequence can be detected and brought to the attention of the
user. No assessment of weld quality is made by this process analysis. It is not possible to detect all faults.
This process analysis is not a substitute for diligence and quality control on the part of the user!
If an irregularity is detected, always check the fault indicator on the welding machine and consult the
Troubleshooting → page 36 section.
Indicator
Hand tool
AFI
Fault indi-
cator
Welding
Operating
machine status indica-
tor
Service
indicator
Process-
fault indicator
Hand-tool
fault indicator
Tempera-
ture indicator
*2302408*
System Hand tool
ready for with stud
use inserted
pressed
against
base metal,
ready for
triggering
Green Green
light light
Off Green
light
Green Green
light light
Off Off
Off Off
Off Off
Off Off
2302408
During the Welding
welding operation
operation completed,
no irregu-
larities
Green Off
light
Green Off
light
Green Green
light light
Off Off
Off Off
Off Off
Off Off
Welding
operation
completed,
irregular-
ities de-
tected
Off
Flashing
red light
Off
Off
Flashing
red light
Off
Off
English 27