Lincoln Electric SVM172-A service manual 23OPERATIONB-23, STT and STT II Synergic, 035 045 052

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B-23OPERATIONB-23

MACHINE FUNCTIONALITY BY WELD PROCESS

STT AND STT II (SYNERGIC)

Use the following tables to review how the machine functions (output controls, arc control, Start options and weld options) for the weld modes listed in the top table.

STT AND STT II MODES

MATERIAL	PROCESS		GAS	WIRE SIZE
				0.035	0.045	0.052
STEEL	STT		Ar/CO2	109	125	125
STAINLESS
			CO2
STEEL	STT		Ar/CO2	110	126	126
		II
STAINLESS
			CO2

OUTPUT CONTROL KNOBS (There is no Voltage control when STT welding.)

							START OPTIONS
200		----					PREFLOW TIME		FUNCTION
							0 - 10 seconds	Adjusts the time the gas flows
WFS	AMPS	VOLTS		TRIM
								after the trigger is pulled and
								prior to feeding wire.
							RUN-IN WFS:
LESS	MORE						Off, 50 to150 in/min.	Run-in sets the wire feed speed
DEPOSITION	DEPOSITION							from the time the trigger is
EFFECT / RANGE		DESCRIPTION						pulled until		an arc is estab-
								lished.
PEAK CURRENT	Peak Current acts similar to an						Start Procedure	The	Start	Procedure	controls
								the	WFS. Trim at a		specified
	arc pinch control. Peak Current
								time	at the beginning of the
	sets the arc		length and			pro-
								weld. During the start time, the
	motes	good	fusion.		Higher
								machine will ramp up or down
	peak current levels will cause
								from the Start Procedure to the
	the arc to broaden momentarily
								preset Welding Procedure.
	while increasing arc length. If
	set too	high,	globular		transfer END OPTIONS
	may occur. Setting it				too	low	PARAMETER RANGE		FUNCTION
	may cause instability and wire
							Postflow Time:
	stubbing. Best			practice is to
							0 to 10 seconds	Adjusts the time that shielding gas
	adjust for minimum spatter and
								flows after the welding output turns
	puddle agitation.
								off.
B A C K G R O U N D Background			Current controls				Crater Procedure	Crater Procedure controls the
								WFS and volts for a specified time
CURRENT	the overall heat input				in	the
								at the end of the weld after the trig-
	weld.	High	background			cur-
								ger is released. During the Crater
	rents flatten the weld bead, and
								time, the machine will ramp up or
	low background currents create
								down from the Weld Procedure to
	a taller rounded contour.
								the Crater Procedure.
TAIL OUT	Tail out provides additional						Burnback:	The burnback time is the amount of
							0 to .25 Seconds	time that the weld output continues
(STT ll MODES power		without		the	molten
								after the wire stops feeding. It pre-
ONLY)	droplet	becoming too large.
								vents the wire from sticking in the
	Increase as necessary to add
								puddle and prepares the end of the
	heat input without increasing
								wire for the next arc start.
	arc length. Often this results in
							Spot Timer:	Adjusts the time welding will con-
	faster travel speeds. Note that
							0 to 10 Seconds	tinue even if tigger is still pulled.
	as tail out increases, the peak
								This option has no effect in 4-Step
	current and/or background cur-
								Trigger Mode.
	rent may need to be reduced.

POWER FEED 10M SINGLE/DUAL