(
1
)
“-” Output terminal.
(
2
)
TIG torch remote connection socket.
(
3
)
TIG torch gas connector.
(
4
)
“+” Output terminal.
(
5
)
Power switch: control the power
Supply on and off.
(
6
)
Input power cable.
(
7
)
Inlet gas connector.
(
8
)
Parameter select/adjust Knob. *
(
9
)
Post gas flow setting indicator.. *
(
10
)
End current setting indicator.*
(
11
)
Down slope setting indicator. *
(
12
)
Pulse width setting indicator.*
(
13
)
Pulse frequency setting indicator.*.
(
14
)
Base current setting indicator.*
(
15
)
Tig Pulse Mode “ON” indicator.*
(
16
)
Tig Pulse Mode”OFF” indicator.*
(
17
)
I2: Tig Welding Current setting indicator.*
(
18
)
Pre gas flow setting indicator.*.
(
19
)
I STA: start current setting indicator.*
(
20
)
Up Slope parameter.
(
21
)
MMA Arc Force setting indicator.*
(
22
)
MMA Welding Current setting indicator.*
(
23
)
MMA Hot Start setting indicator.*
(
24
)
Welding Mode Selector ( change to MMA, Tig lift, Tig HF)
(
25
)
MMA mode indicator
(
26
)
Tig Lift mode indicator.*
(
27
)
Tig HF mode indicator.*
(
28
)
Trigger control mode selector.*
(
29
)
2T trigger mode indicator.
(
30
)
4T trigger mode indicator.
(
31
)
Alarm indicator.*
(
32
)
Voltage indicator.
(
33
)
Amper indicator.
(
34
)
Multi meter display
(
35
)
Second (time) indicator
(
36
)
Percentual indicator
(
37
)
Hertz (frequency) indicator.*
*Denotes more detailed explanation of function to follow.
Further Controls Explained
Multi Meter display (34)
Before welding this displays the setting selected or being adjusted using the control knob (8). During
welding it displays welding current. The parameter setting displayed is indicated by the LEDs beside
the display; Current (A), Time (S), Percentage (%), Voltage (V) and Frequency (Hz). If left inactive for
several seconds, display will revert back to main welding current setting.
TIG HF/ Lift Ignition Modes (26,27)
For TIG welding process, contact of the torch tungsten to the workpiece will cause contamination of
the tungsten and the workpiece that will adversely affect the weld quality, especially when the
tungsten is electrically energised.
HF Ignition
(High Frequency) sends a pulse of high energy electricity through the torch system that is
capable of ‘jumping’ between the tungsten and the workpiece, ensuring arc starting without any
contact between the tungsten and workpiece. The disadvantage of HF ignition is that the high ener-
gy electrical pulse creates significant electrical and radio signal interference, which limits its use
around sensitive electronic equipment such as computers.
3.4.3
TIG GUN
Control
TIG GUN (TIG-17)
12 Pin Remote Plug Connection
3.4.4
Tig Welding
Techniques
DC TIG Welding
The DC power source uses what is known as DC (direct current) in which the
main electrical component known as electrons flowin only one direction from
the negative pole (terminal) to the positive pole (terminal). In the DC electrical
circuit there is an electrical principle at work which should always be taken into
account when using any DC circuit. With a DC circuit 70% of the energy (heat) is
always on the positive side. This needs to be understood because it determines
what terminal the TIG torch will be connected to (this rule applies to all the other
forms of DC welding as well ).
DC TIG welding is a process in which an arc is struck between a TUNGSTEN
electrode and the metal work piece. The weld area is shielded by an inert gas
flow to prevent contamination of the tungsten, molten pool and weld area.
When the TIG arc is struck the inert gas is ionized and superheated changing it’s
molecular structure which converts it into a plasma stream. This plasma stream
flowing between the tungsten and the work piece is the TIG arc and can be as
hot as 19,000°C. It is a very pure and concentrated arc which provides the
controlled melting of most metals into a weld pool. TIG welding offers the user
the greatest amount of flexibility to weld the widest range of material and
thickness and types. DC TIG welding is also the cleanest weld with no sparks or
spatter.
The intensity of the arc is proportional to the current that flows from the tungsten.
The welder regulates the welding current to adjust the power of the arc.
Typically thin material requires a less powerful arc with less heat to melt the
material so less current (amps) is required, thicker material requires a more
powerful arc with more heat so more current (amps) are necessary to melt the
material.