Lincoln Electric IM892-C manual Gmaw-Stt, Weld Modes

B-21 OPERATION B-21

GMAW-STT™

Waveform Control Technology™ maximizes the ability to modify the arc for the perfect weld. When STT™ welding, the parameters to control are:

•Wire Feed Speed - sets the deposition rate.

•Peak Current - controls the arc length.

•Background Current - regulates the bead contour.

•Tail-out - provides additional power in the arc.

There is no Voltage control when STT™ welding.

220

WFS AMPS

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Deposition Deposition

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VOLTS TRIM

MSP4 OPERATION

WELD MODES

ELECTRODE AND GAS					WIRE SIZE
					0.035	0.045		0.052
STEEL CO2			Ar/CO 2		110	126		126
STAINLESS			He/Ar/CO2		110	126		126
(with Hot Start)					123	124		124
STEEL	CO2		Ar/CO 2
STAINLESS			He/Ar/CO2		123	124		124
(SYNERGIC STT)					111	117		120
STEEL	CO	2
STEEL	AR/CO2				112	118		121
STAINLESS He/Ar/CO2					127	129		---
STAINLESS Ar/CO 2					131	133		---
SYNERGIC STT, OPEN ROOT					113	119		122
STEEL	CO	2	He/Ar/CO 2
STAINLESS					135	137		---
			WAVEFORM CONTROL TECHNOLOGY
			109		Steel
IR PORT					.035"
								SETUP
			STT
WELD MODE								START OPTIONS
ARC CONTROL								END OPTIONS
				SET
			ARC CONTROL
EFFECT / RANGE				DESCRIPTION
PEAK CURRENT Peak Current acts similar to an arc pinch
			control. Peak Current sets the arc leng th
			and promotes go od fus ion.				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.

BA CKG	RO UND	Background Current controls the overall
CURRENT		heat input in t he weld .
TAIL OUT		Tail out prov ides addi tio nal po wer
( STT ll	MOD ES w ithou tt he molt en droplet beco min g
ONLY)		too large . Increase as necessary 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.

START OPTIONS
PREFLOW TIME	FUNCTION
0 - 25.0 seconds	Adjusts the time that shielding
	gas flows after the trigger is
	pulled and prior to feeding wire.
RUN-IN WFS:	Run-in sets the wire fee d
Off, 30 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
	procedures.

-

END OPTIONS
PARAMETER		FUNCTION
RANGE
Spot Timer	Adjust the time		weldin g w ill
0 to 120.0 Seconds	conti nue even		if the tr	igg er
	is sti	ll pulled . This op		tion
	has	no e ffect i	n 4-Step
	Trigg er Mode.
Postflow Time:	Adjusts the time that shielding
0 to 25.0 seconds	gas flows after the welding out-
	put turns off.
Burnback: 0 to .25	The	burnba ck	time	is t he
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.
Crater Procedure	Crater is not commonly used
	in STT weld procedures.

POWER FEED™ 25M