Lincoln Electric IM806 manual Welding Process, Duty Cycle, Stick Constant Current Welding

B-4 OPERATION B-4

WELDING PROCESS

DUTY CYCLE

Duty Cycle is the the percentage of time the load is being applied in a 10 minute period. For example, a 60% duty cycle reresents 6 minutes of load and 4 min- utes of no load in a 10 minute period.

STICK (CONSTANT CURRENT) WELDING

Connect welding cables to the "TO WORK” and "ELECTRODE” studs. Start the engine. Set the "Polarity” switch to the desired polarity. Set the “RANGE” switch to a setting that is equal to or slightly greater than the desired welding current. (The “RANGE” dial marking indicates the maximum current for that range). Fine adjustment of the welding current is made by adjusting the output “CONTROL” or remote control. For best arc stability, use settings 5 through 10.

The Weldmark 225 can be used with a broad range of AC and DC stick electrodes. See “Welding Tips 1” included with the WELDMARK 225 for electrodes within the rating of this unit and recommended weld- ing currents of each.

TIG (CONSTANT CURRENT) WELDING

The K930-[ ] TIG Module installed on a Weldmark 225 provides high frequency and shielding gas control for AC and DC GTAW (TIG) welding processes. The TIG Module allows full range output control. Afterflow time is adjustable from 0 to 55 seconds.

When using the Weldmark 225 for AC TIG welding of aluminum, the following settings and electrodes are recommended:

SETTINGS FOR PURE TUNGSTEN

TUNGSTEN	RANGE SWITCH					APPROXIMATE
DIAMETER (in.)		SETTINGS				CURRENT RANGE
1/8		70,	90,	or 125		80	- 150 Amps
3/32		50,	70,	or	90	45	- 130 Amps
1/16			50,	or	70	40	- 80 Amps
SETTINGS FOR 1% THORIATED TUNGSTEN
TUNGSTEN	RANGE SWITCH					APPROXIMATE
DIAMETER (in.)		SETTINGS				CURRENT RANGE
1/8	70,	90,	125, or 175			80	- 225	Amps
3/32	50,	70,		90, or 125		50	- 180	Amps
1/16		50,		70, or	90	45	- 120	Amps

The K930-[ ] TIG Module should be used with the Weldmark 225 on high idle to maintain satisfactory operation. It can be used in the AUTO position but the delay going to flow idle after welding is ceased will be increased if the AFTERFLOW CONTROL is set above 10 seconds.

WIRE FEED WELDING PROCESSES (CONSTANT VOLTAGE)

The only Innershield® electrode recommended for use with the Weldmark 225 is NR®-211-MP. The electrode sizes and welding ranges that can be used with the Weldmark 225 are shown in the following table:

Diameter	Wire Speed		Approximate
(in.)	Range In./Min.		Current Range
.035	80	- 110	75A to 120A
.045	70	- 130	120A to 170A
.068	40	- 90	125A to 210A

The Weldmark 225 is recommended for limited “MIG” welding (GMAW - gas metal arc welding). The recom- mended electrodes are .030” and .035” L-50 and L-56. They must be used with a blended shielding gas such as C25 (75% Argon - 25% CO2). The welding ranges that can be used with the Weldmark 225 are shown in the following table:

Diameter	Wire Speed	Approximate
(in.)	Range In./Min.	Current Range
.030	80 - 110	75A to 120A
.035	70 - 130	120A to 170A

WELDMARK 225