9
Touch, with the electrode fastened, in the
electrode holder, the work piece until the arc
Avoid hammering the workpiece with the
electrode since it may loose the coating
- After striking the arc keep feeding the
electrode into the weld pool with an angle of
of the arc can also be controlled by lifting or
-
tion of the welding angle may increase the
size of the weld pool improving the capacity
- At the end of the weld let the slag cool off
CAUTION:
Protect your eyes when hitting the slag
with the chip hammer to avoid damages.
CAUTION:
A bad start can be due to the dirty wor-
kpiece, a bad connection between earth
cable and work piece, or the bad faste-
ning of the electrode in the electrode
holder.
7.0 QUALITY OF THE WELD
The quality of the weld will depend mainly on
the ability of the welder, on the type of weld
and on the quality of the electrode: Choose
the proper electrode before attempting to
weld, paying attention to the thickness and
Correct welding current.
If the current is too high the elctrode will burn
fast and the weld pool will be wide irregula-
too low you will lack power and the weld pool
Correct arc length.
If the arc is too long it will cause spatters and
-
Correct welding speed.
The correct welding speed will consent to
achieve a weld of proper width, without wa-
8.0 TIG WELDING
The TIG process uses the electrical arc
struck between the tungsten electrode of the
In TIG welding the torch is always con-
nected to the negative pole of the welder.
Welder preparation:
- Select TIG welding thru the Selector on
- Connect the earth cable to the positive
pole of the welder and the earth clamp to the
- Connect the TIG torch to the negative
pole of the welder and the gas hose to the
-
led using the knob on the torch handle.
Use inert gas (argon ) only.
9.0 TIG WELDING BY SCRATCH ARC
- Ensure the electrode at the torch nozzle,
electrode is sharply pointed with an angle of
- Set the welding current considering the
thickness of the material to be welded and of
the diameter of the tungsten electrode to be
- Open the gas valve on the torch handle,
Cover your face with the head shield, bring
the torch to within 3-4mm of the work, and
-
Scratch the tip of the electrode until an arc
develops, quickly withdraw the electrode and
REMEMBER to turn OFF the gas immediate-
