Lincoln Electric Pro-MIG 140 Changing Machine Over to Feed Other Wire Sizes, Overload Protection

B-6 OPERATION B-6

The Pro-MIG 140 is suitable for .035" aluminum wire and .030" stainless wire. Refer to Table B.1 for recom- mended procedure settings.

TABLE B.1

		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	C-8.5	D-10	NR	NR	NR
	4043 Aluminum
	Wire
MIG DC+			18 ga	16 ga	14 ga	12 ga	10ga
	.030 Dia	98% Argon/	B-6	C-6.5	D-7.5	NR	NR
	308L Stainless	2% Oxygen
	Steel Wire

NOTE:

NR - Not Recommended

CHANGING MACHINE OVER TO FEED OTHER WIRE SIZES

The Pro-MIG 140 is shipped from the factory ready to feed .035” (0.9 mm) diameter wire. To operate the Pro-MIG 140 with other sizes of wire, it is necessary to change the appropriate contact tip, diffuser, nozzle and change the drive roll over to other sizes. Refer to Changing the Contact Tip and Changing the Drive Roll, in the MAINTENANCE section, for specific infor- mation on these procedures.

WELDING WITH GMAW (MIG)

Shielding Gas

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

When using the GMAW process, obtain and install a gas regulator and hose kit. If using 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 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 Pro-MIG 140. 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 Pro-MIG 140.

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.

OVERLOAD PROTECTION

Output Overload

The Pro-MIG 140 is equipped with a circuit breaker and a thermostat which protects the machine from damage if maximum output is exceeded. The circuit breaker button will extend out when tripped. The cir- cuit breaker must be manually reset.

Thermal Protection

The Pro-MIG 140 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 reasonable operating temperature. This is an auto- matic function of the Pro-MIG 140 and does not require user intervention. The fan continues to run during cooling.

Electronic Wire Drive Motor Protection

The Pro-MIG 140 has built-in protection for wire drive motor overload.

Pro-MIG 140