Lincoln Electric IM927 manual Welding Process, Stick Constant Current Welding, ARC Gouging

B-4 OPERATION B-4

WELDING PROCESS

For any electrodes the procedures should be kept within the rating of the machine. For electrode infor- mation see the appropriate Lincoln publication.

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. The “RANGE” switch markings indicate the maximum current for that range as well as the typical electrode size for that range. The “OUTPUT” Control provides fine adjust- ment of the welding current within the select range. For maximum output within a selected range set the “OUTPUT” Control at 10. For minimum output within a selected range set the “OUTPUT” Control at 5. (“OUT- PUT” Control settings below 5 may reduce arc stabili- ty) For best overall welding performance set the “RANGE” Switch to the lowest setting and the OUT- PUT” Control near the maximum to achieve the desired welding current.

RANGE SETTING	TYPICAL	CURRENT RANGE
	ELECTRODE SIZE
90 MAX.	3/32	40 TO 90 AMPS
125 MAX.	1/8	70 TO 145 AMPS
210(DC)/225(AC)	5/32	120 TO 210(DC),
MAX.		225(AC) AMPS

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. After flow 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	90	or	145	80	-	150	Amps
3/32	90	or	145	45	-	130	Amps
1/16		90		40 - 80 Amps

SETTINGS FOR  1% THORIATED TUNGSTEN

TUNGSTEN	RANGE SWITCH	APPROXIMATE
DIAMETER (in.)	SETTINGS	CURRENT RANGE
1/8	90, 145, or 210	80	- 225		Amps
3/32	90 or 145	50	-	180	Amps
1/16	90 or 145	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 AFTER FLOW CONTROL is set above 10 seconds.

WIRE FEED WELDING PROCESSES (CONSTANT VOLTAGE)

The 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 recommended electrodes are .030” and .035” L-50 and L-56. They must be used with a blended shield- ing gas such as C25 (75% Argon - 25% CO2). The welding ranges that can be used with the WELD- MARK 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

ARC GOUGING

The Weldmark 225 can be used for limited arc goug- ing.

Set the Range switch to adjust output current to the desired level for the gouging electrode being used according to the ratings in the following table:

ELECTRODE DIAMETER	CURRENT RANGE (DC, electrode positive)
1/8	60	-	90 Amps
5/32	90	-	150 Amps
3/16	200 - 250 Amps

WELDMARK 225