Connection And Preparation For Welding; Manual Shielded Metal Arc; Features Enabled With Mma Welding - Saf-Fro PRESTO 300MV Instrucciones De Uso Seguridad Y Mantenimiento

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5 - CONNECTION AND PREPARATION FOR WELDING

SWITCH OFF THE WELDING MACHINE BEFORE
CARRYING OUT THE CONNECTIONS.
5.1 - MANUAL SHIELDED METAL ARC WELDING (MMA).
Connect the welding accessories carefully in order to avoid power losses.
Carefully comply with safety rules.
¿ÈÉÊ º»Ê»ÈÿĻ ʾ» ÆÈÅÆ»È ÆÅ·ȿÊÏ ¼ÅÈ Ê¾» »Â»¹ÊÈź» ÊÅ ¸» ËÉ»º ¹ÅÄÉËÂÊ
ʾ» »Â»¹ÊÈź» º·Ê· ¼ÅÈ Ê¾¿É ¿Ä¼ÅÈ÷ʿÅÄ
2. Fit the required electrode on the electrode holder.
3. Connect the welding cables to the output terminals of the unit for the
selected polarity:
4. ATTENTION: insert the male connector with the key lining up with
the keyway and rotate approximately ¼ turn clockwise. Do not
over tighten.
· ÅÈ ÉÊ¿¹Á  ¿È»¹Ê ËÈÈ»ÄÊ Â»¹ÊÈź» ÅÉ¿Ê¿Ì» ¹ÅÄÄ»¹Ê ʾ»
»Â»¹ÊÈź» ¾Åº»È ¹·¸Â» ÊÅ ÆÅÉ¿Ê¿Ì» ͻº ÅËÊÆËÊ Ê»Èÿķ »¼
¸ ÅÈ ÉÊ¿¹Á  ¿È»¹Ê ËÈÈ»ÄÊ Â»¹ÊÈź» ÅÉ¿Ê¿Ì» ¹ÅÄÄ»¹Ê ʾ» ÍÅÈÁ
»·º ÊÅ Ä»½·Ê¿Ì» ͻº ÅËÊÆËÊ Ê»Èÿķ »¼
near the welding zone.
5. Shown here below is the connection method for DCEP welding.
Fig.4
6. The connection of these two connectors as made above will result in
ͻº¿Ä½ Ϳʾ Ȼ̻ÈÉ» ÆÅ·ȿÊÏ É¾·ÂÂÅÍ Æ»Ä»ÊÈ·Ê¿ÅÄ
ÅÈ ÉÊ¿¹Á  ¿È»¹Ê ËÈÈ»ÄÊ Â»¹ÊÈź» »½·Ê¿Ì» ÉͿʹ¾ ʾ» ¹·¸Â»É
connections at the machine to obtain welding with "straight polarity"
º»»Æ ƻĻÊÈ·Ê¿ÅÄ
8. Turn ON the machine (Ref.A-Fig.3) and select the Electrode welding
Ãź» »¼ ¿½
9. Select the Hot Start and Arc Force functions thru the selection key
»¼ ¿½
· ¿Ê¾ ʾ» ÅÊ Ê·ÈÊ   ÊËÈÄ Ê¾» È»½Ë·ʿÅÄ ÁÄŸ »¼
·ºÀËÉÊ Ê¾» ÅÊ Ê·ÈÊ Ì·ÂË» ʾ» º¿ÉÆÂ·Ï Í¿Â ̿»Í ʾ» É»Ê Ì·ÂË» ¼ÈÅÃ
ÊŠ÷Π¾» ºËÈ·Ê¿ÅÄ Å¼ ʾ» ÅÊ Ê·ÈÊ ¼ËĹʿÅÄ ¿É λº ÊÅ
¿Ê É ÄÅÊ ÆÅÉÉ¿¸Â» ÊÅ ¹¾·Ä½»
¸ ¿Ê¾ ʾ» ȹ Åȹ»   ÊËÈÄ Ê¾» È»½Ë·ʿÅÄ ÁÄŸ »¼
·ºÀËÉÊ Ê¾» ȹ Åȹ» Ì·ÂË» ʾ» º¿ÉÆÂ·Ï Í¿Â ̿»Í ʾ» É»Ê Ì·ÂË» ¼ÈÅÃ
ÊŠ÷Î
c. After 5 seconds, the unit will automatically exits from the regulation
ûÄË ÅÈ ÆÈ»ÉÉ · É»¹Åĺ ʿû ʾ» ɻ»¹Ê Á»Ï »¼
¿Ãûº¿·Ê»ÂÏ ¾»  »¼ ¿½
ºÀËÉÊ Ê¾» ·È¹ »Ľʾ »¼ ¿½
cause spatters and small fusion of the welding piece. If the arc length
¿É ÊÅŠɾÅÈÊ Ê¾» ·È¹ ¾»·Ê Ϳ ¸» ¿ÄÉË ¹¿»ÄÊ ¹·ËɿĽ ʾ» »Â»¹ÊÈź» ÊÅ
stick to the work piece; the right balance of the arc length in relation to
the welding application and type of electrode must be found.
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CONNECTION AND PREPARATION FOR WELDING
¿½
¿½ ·Äº ʾ» ¹Â·ÃÆ
¿½ ÊÅ
É»¹
¿½ ÊÅ
¿½ ÊÅ »Î¿Ê
ÊËÈÄÉ  ·½·¿Ä
¿¼ ʾ» ·È¹ »Ľʾ ¿É ÊÅÅ ÂÅĽ ¿Ê Í¿ÂÂ
EN-8
 ÅÂÊ·½» »ºË¹Ê¿ÅÄ »Ì¿¹» ·É º»¼·ËÂÊ Ê¾» º»Ì¿¹» ¿É 
ÊÅ ·¹Ê¿Ì·Ê» ¿Ê ÆÈ»ÉÉ ÅĹ» ¼ÅÈ É»¹ ʾ» Á»Ï »¼
 ¼ËĹʿÅÄ  ·Ê ʾ» »Äº ż ͻº¿Ä½ ʾ» ËÄ¿Ê ¿É 
automatically restart when the electrode gets in touch with the work piece.
È» É»Ê Ê¾» ͻº¿Ä½ ¹ËÈÈ»ÄÊ ÅÄ · ȷĽ» ¼ÈÅÃ Ã¿Ä ÊŠ÷Π·Ì·¿Â·¸Â» ¿ÊÉ
value depends on the supply voltage available in the area and by the
ͻº¿Ä½ ÆÈŹ»ÉÉ ËɿĽ ʾ» Ĺź»È ÅÄÊÈÅ ÁÄŸ »¼
13. To use remote control: connect the remote control connector to the
Æ¿ÄÉ È»¹»ÆÊ·¹Â» ÅÄ Ê¾» ¼ÈÅÄÊ Æ·Ä»Â »¼
ʾ» Á»Ï »¼ ¿½ Ä Ê¾¿É ¹Åĺ¿Ê¿ÅÄ Ê¾» ¹ËÈÈ»ÄÊ ¹·Ä ¸» ·ºÀËÉÊ»º
independently of the setting made on the unit, but attention: the max
welding current by remote control depends on the value set on the
¼ÈÅÄÊ Æ·Ä»Â Í¿Ê¾ ʾ» Ĺź»È ÅÄÊÈÅ ÄŸ »¼
14. The welding current should be chosen following the instruction given
by the electrodes manufacturer on the electrode box, but the following
indications may be useful as general information:
¾¿¹ÁÄ»ÉÉ»É ¼ÅÈ ·Ê Electrode
welding, diameter
butt welding and (mm)
ÂÂ»Ê Í»Âº¿Ä½ ÃÃ
1.6 1.6
2.0 2.0
2.0-3.0 2.5
3.0-5.0 3.2
6.0-10 4.0
> 8.0 5.0
Tab.1
NOTE: ADJUST THE WELDING CURRENT ACCORDING TO
THE DIAMETER OF THE ELECTRODE TO BE USED AND THE
PROCEDURE IN COURSE.

5.1.1 - FEATURES ENABLED WITH MMA WELDING

HOT START.
This is a temporary increase in the initial welding current. This helps ignite
the arc quickly and reliably.
ANTI-STICKING.
This is a function that decreases the output current of the machine to a
low level when the operator makes an error and sticks the electrode on
the work piece. This decrease in current allows the operator to remove
the electrode holder without creating large sparks that can damage the
electrode holder.
ARC FORCE.
This is a temporary increase in the output current during normal welding.
This temporary increase in output current is used to clear intermittent
connections between the electrode and the weld puddle that occur during
normal stick welding.
ARC LENGTH.
This is an active control feature that guarantee the best arrangements
between the arc stability and spatter presence. The control measure in
each instant the output voltage and it determines the power to break with
the mapped Arc Force level the metal drop that is transferred from the
electrode to the work piece as guarantee the arc stability. With this feature
ʾ» ͻº¿Ä½ ÅƻȷʿÅÄÉ ·È» É¿ÃÆ¿ »º ·Äº ʾ» ͻº»º ÀÅ¿ÄÉ ÂÅÅÁÉ ¸»ÊÊ»È
¿Ä 
¿½ ¿Ê¾ ʾ»
Éʷĺ ¸Ï ÊÅ
¿½
¿½ ·Äº »Ä·¸Â» ¿Ê Ϳʾ
¿½
Average
intensity for
rutile electrodes
(A)
40
55
70
110
160
200