Lincoln Electric IM915 manual STT and STT II NONN-SYNERGIC, MAW-S TT WE L D Mode, Wir E S Ize

b-28OPERATIONb-28

MACHINE FUNCTIONALITY bY WELD PROCESS

STT AND STT II (NONN-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.

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

G MAW-S TT WE L D MODE

MA T E R IA L	G A S	WIR E S IZE
		0.035	0.045	0.052
Steel	CO2, Ar/CO2	110	126	126
Stainless	Ar/He/CO2	110	126	126
(With Hot Start)
Steel
	CO2, Ar/CO2	123	124	124
Stainless	Ar/He/CO2	123	124	124
(Synergic STT)
Steel	CO2	111	117	120
Steel	Ar/CO2	112	118	121
Stainless	Ar/He/CO2	127	129	-----
Stainless
	Ar/CO2	131	133	-----
(Synergic STT,
Open Root)
Steel
	CO2	113	119	122
Stainless	Ar/He/CO2	135	137	-----

200		----
WFS	AMPS	VOLTS TRIM
LESS	MORE
DEPOSITION	DEPOSITION
START OPTIONS
PREFLOW TIME		FUNCTION
0 to 10 seconds		Adjusts the time the gas flows
		after the trigger is pulled and
		prior to feeding wire.
RUN-IN WFS:		Run-in sets the wire feed
Off, 50 to150 in/min.		speed from the time the trigger
		is pulled until an arc is estab-
		lished.
Start Procedure		The Start Procedure is not
		commonly used with STT pro-
		cedures.

ARC CONTROL

EFFECT / RANGE	DESCRIPTION
PEAK CURRENT	Peak Current acts similar to an arc
	pinch control. Peak Current sets
	the arc length and promotes good
	fusion. Higher peak current levels
	will cause the arc to broaden
	momentarily while increasing arc
	length. If set too high, globular
	transfer may occur. Setting it too
	low may cause instability and wire
	stubbing. Best practice is to adjust
	for minimum spatter and puddle
	agitation.
BACKGROUND CUR-	Background Current controls the
RENT	overall heat input in the weld.
TAIL OUT	Tail out provides additional power
(STT ll MODES ONLY)	without the molten droplet becom-
	ing too large. Increase as neces-
	sary to add heat input without
	increasing arc length. Often this
	results in faster travel speeds.
	Note that as tail out increases, the
	peak current and/or background
	current may need to be reduced.

	WAVEFORM CONTROL TECHNOLOGY
	110		STEEL	SETUP
IR PORT			.035”
		STT
WELD MODE				START OPTIONS
ARC CONTROL				END OPTIONS
		SET
END OPTIONS
PARAMETER RANGE			FUNCTION
Spot Timer:		Adjusts the time welding will continue
0 to 120.0 Seconds		even if tigger is still pulled. This option
		has no effect in 4-Step Trigger Mode.
Postflow Time:		Adjusts the time that shielding gas
0 to 25.0 seconds		flows after the welding output
		turns off.
Crater Procedure		Crater Procedure is not commonly
		used in STT wels procedures.
Burnback:		The burnback time is the
0 to .25 Seconds		amount of time that the weld
		output continues after the wire
		stops feeding. It prevents the
		wire from sticking in the puddle
		and prepares the end of the
		wire for the next arc start.

POWER FEED™ 10M SINGLE WIRE FEEDER