Lincoln Electric SVM172-A Step Trigger Operation, See Figure B.4, Sequence of Operation

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B-14			OPERATION			B-14
2 STEP TRIGGER OPERATION					3. UPSLOPE: Once the wire touches the work and an
(See Figure B.4)
					arc is established, both the machine output and the
Sometimes it is advantageous to set specific arc start,
					wire feed speed ramp to the weld settings through-
crater and arc ending parameters for the ideal weld.
					out the start time. The time period of ramping from
Many times when welding aluminum crater control is
					the start settings to the weld settings is called UPS-
necessary to make a good weld. This is done by set-
					LOPE.
ting Start, Crater and Burnback functions to desired
values.					4. WELD: After upslope, the power source output and
SEQUENCE OF OPERATION					the wire feed speed continue at the weld settings.
Following is the total weld sequence that the Power					5. CRATER: As soon as the trigger is released, the
					wire feed speed and power source output ramp to
Feed 10M Single Wire Feeder will execute. If any para-
					the crater settings throughout the crater time. The
meter is inactive or its time is set to zero, the weld pro-
					time period of ramping from the weld settings to the
cedure immediately shifts to the next parameter in the
					crater settings is called DOWNSLOPE.
sequence.
1. PREFLOW: Shielding gas begins to flow immediate-					6. BURNBACK: After the crater time expires, the wire
					feed speed is turned OFF and the machine output
ly when the gun trigger is pulled.
					continues for the burnback time.
2. STRIKE: After preflow	time	expires,	the	power	7. POSTFLOW: Next, the machine output is turned
source regulates to the	start	output	and	wire is

advanced towards the work piece at the Strike WFS.	OFF and shielding gas continues until the post flow
	timer expires.
If an arc is not established within 1.5 seconds, the
power source output and wire feed speed skips to
the weld settings.

FIGURE B.4

	Head / Procedure Select		Memory
•	Press to select head or change active	•	Permanent storage for procedure
	procedure.		settings.
•	Changes to weld settings affect	•	Six available memory locations. One
	active procedure only.		procedure (A or B) can be stored in
	t		each.

MEMORY

PRESS AND HOLD TO SAVE

POWER FEED 10M SINGLE/DUAL