Lincoln Electric IM724 Changing Machine Over to Feed Other Wire Sizes, Welding with Gmaw MIG

B-6 OPERATION B-6

The SP-135T is suitable for .035" aluminum wire and

.030" stainless wire. Refer to Table B.1 for recom- mended procedure settings (requires K499 Argon Regulator Kit).

TABLE B.1

		Shielding	Voltage/Wire Speed
Process	Welding Wire	Gas	16 ga	14 ga	12 ga	10 ga
MIG DC+	.035 Dia	100% Argon	B-5	D-7	D-9	D-9
	4043 Aluminum
	Wire
MIG DC+	.035 Dia	100% Argon	B-5	C-7	D-9	D-10
	5356 Aluminum
	Wire
MIG DC+	.030 Dia	98% Argon/	A-3	C-6	D-7.5	D-7.5
	308L Stainless	2% Oxygen
	Steel Wire

CHANGING MACHINE OVER TO FEED OTHER WIRE SIZES

The SP-135T is shipped from the factory ready to feed

.023”-.025” (0.6 mm) diameter wire. To operate the SP-135T with other sizes of wire, it is necessary to change the contact tip and change the drive roll over to other sizes. Refer to Changing the Contact Tip and Changing the Drive Roll, in the MAINTENANCE sec- tion, for specific information on these procedures.

WELDING WITH GMAW (MIG)

Shielding Gas

When using the GMAW process, obtain and install a gas regulator and hose kit; K463 (for CO2) or K499 (Argon mixed) gas regulator and hose kit.

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 for CO2]. For argon mixed gas, trigger to release gas pressure, and adjust the flow to give 25 – 30 CFH (12 – 14 I/min).

3.Keep the cylinder valve closed, except when using the SP-135T. 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-135T.

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 kit K549-1 (for .035" / 0.9mm) is also available.

OVERLOAD PROTECTION

Output Overload

The SP-135T is equipped with a circuit breaker and a thermostat which protects the machine from damage if maximum output is exceeded. The circuit breaker but- ton will extend out when tripped. The circuit breaker must be manually reset.

Thermal Protection

The SP-135T 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-135T and does not require user inter- vention. The fan continues to run during cooling.

Electronic Wire Drive Motor Protection

The SP-135T has built-in protection for wire drive motor overload.

SP-135T