Viewing Installed Software Versions; Before Welding; Welding Procedures - CEA DIGISTAR 250 DUAL PULSED Manual De Instrucciones

Viewing installed software versions

The DIGISTAR 250 PULSED has a digital control with software
on board produced in the factory. This software is subject to con-
tinuous innovation and improvement. A number/specific version
displayed on the PROGRAMME DISPLAY identifies the software
of each circuit board in the following way:
• MAIN MICROCONTROLLER
Start the welding machine by turning the switch on the rear
panel to 1. Then press the SPECIAL FUNCTIONS button, fol-
lowed by the RUN/MEM button.
• AUXILIARY MICROCONTROLLER
Start the welding machine by turning the switch on the rear
panel to 1. Then press the SPECIAL FUNCTIONS button, fol-
lowed by the WIRE TEST button.

Before welding

WARNING: Before welding, check that the data on the power
source plate correspond to the supply voltage and frequency.
• Start up the welder by turning the switch on the back panel to
1 (N.B.: the machine will display the last settings made before
it was switched off when it is turned on again);
• Set the various units according to the chosen welding pro-
cess.

Welding procedures

ELECTRODE WELDING
For coated electrode welding with devices that can be adjusted
from the user's "arc force" (adjustable with the V- PARAMETERS
SELECTION key) and "hot start" (adjustable with the SPECIAL
FUNCTIONS key).
You can access this welding mode by pressing the WELD PRO-
CESS key and then turning to MMA
Connect up the welding cables following description in paragraph
"Connecting up welding - ELECTRODE welding cables (fig. A)".
Welding parameters
Table 3 shows the values of current to use with the respective
electrodes for the welding of common steels and low-grade al-
loys. These data have no absolute value and are indicative data
only. For a precise choice follow the instructions provided by the
electrode manufacturer. The current to be used depends on the
welding positions and the type of joint, and it increases accord-
ing to the thickness and dimensions of the part. The current in-
tensity to be used for the different types of welding, within the
field of regulation shown in table 4 is:
• High for plane, frontal plane and vertical upwards welding;
• Medium for overhead welding;
• Low for vertical downwards welding and for joining small pre-
heated pieces.
Ø ELEC-
6010
TRODE (mm)
6011
1,6 -
2 -
2,4 40-80
3,2 75-125
4 110-170
4,8 140-215
5,6 170-250
6,4 210-320
8 275-425
.
ELECTRODE TYPE - Current adjustment field (A)
6012 6013 6020
20-40 20-40 -
25-60 25-60 -
35-85 45-90 -
80-140 80-130 100-150
110-190 105-180 130-190
140-240 150-230 175-250
200-320 310-300 225-310
250-400 250-350 275-375
300-500 320-430 340-450
A fairly approximate indication of the average current to use in
the welding of electrodes for ordinary steel is given by the follow-
ing formula:
where: I = intensity of the welding current
Øe = electrode diameter
Example: for electrode diameter 4 mm
I = 50 x (4 –1 ) = 50 x 3 = 150A
The pre-set values of the welding current
ENCODER 1 knob) and open-circuit voltage (not adjustable) or
of the "arc force" (adjustable with the ENCODER 2 knob - if se-
lected) will be displayed on the A- PARAMETERS Display (ab-
breviated in dVPA) and V - PARAMETERS Display (abbreviated in
dVPV) before welding starts.
The values of the welding current
justable with the ENCODER 1 knob) and the welding voltage
or the "arc force" (adjustable with the ENCODER 2 knob - if se-
lected (on a scale of values varying between 0 and 100 (absolute
value) with an adjustment interval at 1 - a parameter that increases
the energy of the arc under difficult welding conditions) will ap-
pear on the dVPA and dVPV displays during the welding pro-
cess.
Special functions
• HOT START i.e. overcurrent being supplied when the arc is
switched on. (Hot - from 0 to 100 with an adjustment interval
at 1). With electrodes, access can be gained to the "hot start"
function (adjustable with the ENCODER 2 knob, not change-
able during welding) by pressing the SPECIAL FUNCTIONS
key.
TIG WELDING WITH "LIFT" TYPE STRIKING
You can enter this welding mode by pressing the WELDING PRO-
CESS SELECTION key and turning to TIG with the "lift" type strik-
ing .
Connect up the welding cables following the description
given in the paragraph "Connecting up welding - TIG weld-
ing cables (fig. C)".
Welding parameters
Table 4shows the currents to use with the respective electrodes
for TIG AC and DC welding. This input is not absolute but is for
your guidance only; read the electrode manufacturers' instruc-
tions for a specific choice. The diameter of the electrode to use is
directly proportional to the current being used for welding.
7015
6027 7014
7016
- - -
- - -
- 80-125 65-110
125-185 110-160 100-150
160-240 150-210 140-200
210-300 200-275 180-255
250-350 260-340 240-320
300-420 330-415 300-390
375-475 390-500 375-475
30
I = 50 x (Øe – 1 )
(adjustable with
being used for welding (ad-
WELDING
7024 THICKNESS
7018
7028
- -
- -
70-100 100-145
115-165 140-190
150-220 180-250
200-275 230-305
260-340 275-365
315-400 335-430
375-470 400-525
Table 3
(mm)
≤ ≤ ≤ ≤ ≤ 5
≤ ≤ ≤ ≤ ≤ 6,5
> 3,5
> 6,5
> 9,5
> 13