Preparing The Electrode - Cebora 351 Manual De Instrucciones

If you are using gas-lens type accessories, the gas
throughput may be reduced to approximately 3 times the
diameter of the electrode. The ceramic nozzle diameter
must be between 4 and 6 times the electrode diameter.
• Remember to shut off the machine and close the
gas cylinder valve when you have finished welding.

3.5.3 Preparing the electrode

Be especially careful when preparing the electrode tip.
Grind it so that it has vertical grooves as shown in fig.4.
WARNING: LOOSE HOT METAL PARTICLES may cause
personal injury, fire and equipment damage; TUNGSTEN
CONTAMINATION may lower the quality of the weld.
• Use only a grinding machine equipped with adequate
safety guards to shape the tungsten electrode
protect the face, hands and body with suitable gear.
• To shape the tungsten, use a hard, fine-grained abrasive
grinding wheel used solely for this purpose.
• Grind the end of the tungsten electrode into a tapered
shape, for a length equivalent to approximately 1.5-2
times the electrode diameter. (fig. 4).
Fig. 4
3.6. SAVING
Pressing the push-button Q briefly makes a selection;
held down for more than 3 seconds, it saves the data.
Each time it is turned on, the machine always shows
the last welding condition used.
3.6.1. Saving data from the PL program
Using the machine for the first time
When the machine is turned on, the display shows the
symbol PL; this disappears after 5 seconds, and a work-
ing current is displayed. Follow the instructions in para-
graphs 3.2 and 3.5, then proceed as follows to save the
data in the program P01:
· Briefly press the push-button AQ (mem+mem-); the
message P01 will appear, flashing.
· Hold down the push-button AQ for more than 3 sec-
onds, until the symbol P01 stops flashing: at this point,
the data have been saved.
· Obviously, if you wish to save in a program other than
P01, you should briefly press the push-button AQ as
many times as necessary to display the desired pro-
gram.P01 will be displayed the next time the machine is
turned on.
PRESSING THE PUSH-BUTTON AQ BRIEFLY MAKES
A SELECTION, WHILE HOLDING IT DOWN FOR MORE
THAN 3 SECONDS SAVES THE DATA.
18
3.6.2. Save from a free program
The operator may edit and save a selected program by
proceeding as follows:
· Press the push-button AQ briefly and select the desired
program number.
The symbols of free programs are flashing.
Press the button AT and choose the welding procedure;
press the button AS to select the mode (paragraph 3.1).
· Turn the knob Y and set the welding current.
If the TIG procedure has been selected, activate the LED
AB (post gas) by means of the push-button AP, and set
the desired value via the knob Y (paragraph 3.1.)
If you wish to adjust the "slope" times or other parame-
ters, after making these adjustments which are neces-
sary in order to weld, follow the steps described in para-
graph 3.1.
To save in the previously selected program, press the
button AQ for more than 3 seconds, until the number
stops flashing.
To save in a different program, make your selection by
briefly pressing the push-button AQ, then hold down the
push-button AQ for more than 3 seconds.
3.6.3 Save from a saved program.
Beginning with a previously saved program, the operator
may edit the data in memory to update the program itself,
or to find new parameters to save in another program.
3.6.3.1 Updating
· After turning on the machine, select the parameters to
be edited and edit them.
· Hold down the AQ button for more than 3 seconds, until
the save is confirmed (program symbol changes from
d
flashing to steady).
3.6.3.2 Save in a new program
· After turning on the machine, select the parameters to
be edited and edit them.
· Weld, even briefly.
· Briefly press the selector switch AQ until the desired
program is displayed.
· Hold down the AQ button until the save is confirmed
(program symbol changes from flashing to steady).
3.6.4 Weld with synergy.
The purpose of "synergy" is to offer the operator a quick
guide for setting the TIG welding parameters. It is there-
fore not compulsory, but only a suggestion.
"Synergic" relationships between current thickness and
electrode diameter have been developed using Ceriati
grey 2% electrodes (EN26848 WC20), at an alternating
current frequency of 90 Hz.
The teasts were carried out with the waveform n°. 12
(square penetration - sinusoidal cleaning).
The logic: The operator sets the type of material to be
welded, the welding position and thickness in relation to
the welding process; an electrode diameter is suggested
based on these choices, and if confirmed the machine
prepares for welding.
Turning on synergy.
Briefly press the key H (for less than 0.7 sec):the LED I
(Syn) lights simultaneously with the LED L (material). The