Lincoln Electric IM794 Changing Machine Over To Feed Other Wire Sizes, Welding With Gmaw Mig

B-6 OPERATION B-6

The SP-170T is suitable for .035" aluminum wire and

.023"– .035" stainless wire. Refer to Table B.1 for rec- ommended procedure settings. (Requires K586-1 Deluxe Adjustable kit and K664-2 Aluminum - Stainless Feeding Kit.)

CAUTION

It is important when changing between welding with steel wire and aluminum to exchange feeding components due to the lubricant applied to steel wire. Failure to do so may result in contaminated welds when welding aluminum.

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TABLE B.1 — SP-170T

WELDING PROCEDURES

		Shielding		Voltage/Wire Speed
Process	Welding Wire	Gas	22 ga	16 ga	12 ga	1/8”	3/16”	1/4”
	.035 Dia(0.9mm	100% Argon	A-4.5	B-6.5	D-8.5	D-10	E-10	E-10*
	4043 Aluminum
	Wire
MIG DC+
			18 ga	16 ga	14 ga	12 ga	10 ga
	.030 Dia	98% Argon/	A-2	B-3	C-5	D-7	E-10
	308L Stainless	2% Oxygen
	Steel Wire

NOTE: * Test assembly preheat to 250°F.

CHANGING MACHINE OVER TO FEED OTHER WIRE SIZES

The SP-170T is shipped from the factory ready to feed 0.023” – .025" (0.9 mm) diameter wire. To operate the SP-170T with other sizes of wire, it may be necessary to change the contact tip, drive roll, and the gun liner configuration. Refer to the MAINTENANCE section, for component configuration and placement.

WELDING WITH GMAW (MIG)

Shielding Gas

When using the GMAW process, install the gas regu- lator and hose. If using 100% CO2 a CO2 adapter is required, sold separately.

1.For CO2, open the cylinder very slowly. For argon- mixed gas, open cylinder valve slowly a fraction of a turn. When the cylinder pressure gauge pointer stops moving, open the valve fully.

2.If using a regulator with an adjustable flow meter, close the gun trigger and adjust the flow to give 15

– 20 cubic ft per hour (CFH) (7 – 10 I/min) [use 20 – 25 CFH (10 – 12 I/min) when welding out of position or in a drafty location.

3.Keep the cylinder valve closed, except when using the SP-170T. When finished welding:

a)Close the cylinder valve to stop gas flow.

b)Depress the gun trigger briefly to release the pressure in the gas hose.

c)Turn off the SP-170T.

WELDING WITH FCAW (Innershield)

When using the FCAW process, the correct drive roll and electrode polarity must be used. See Work Cable Installation in INSTALLATION section for changing the polarity.

Innershield welding kits K549-1 (for .035") and K549-2 (for .045") are also available.

OVERLOAD PROTECTION

Output Overload

The SP-170T is equipped with a circuit breaker which protects the machine from damage if a severe over- load occurs. The circuit breaker button will extend out when tripped. The circuit breaker must be manually reset.

Thermal Protection

The SP-170T has a rated output duty cycle of 20%. If the duty cycle is exceeded, a thermal protector will shut off the output until the machine cools to a reason- able operating temperature. This is an automatic func- tion of the SP-170T and does not require user inter- vention. The fan continues to run during cooling.

Electronic Wire Drive Motor Protection

The SP-170T has built-in protection for wire drive motor overload.

SP-170T