Miller Electric Bobcat 250 manual MIG Welding Gmaw Guidelines, Holding And Positioning Welding Gun

SECTION 15 − MIG WELDING (GMAW) GUIDELINES

15-1. Typical MIG Process Connections Using A Voltage-Sensing Wire Feeder

	Gun
Workpiece
Work Clamp	Voltage

Sensing Clamp

	! Weld current can damage
	electronic parts in vehicles.
	Disconnect		both	battery
	cables before welding on a
Constant	vehicle. Place work clamp as
	close to the weld as possible.
Current (CC)	Voltage sensing wire feeders are
Or Constant
	used with constant current (CC) or
Voltage (CV)
	constant	voltage	(CV)	power
Power Source
	sources (14 pin receptacle not re-
	quired).
	If using a CC or CV welding power
	source without a weld output con-
	tactor, use optional secondary con-
	tactor.
	For GMAW, use optional gas valve.

Voltage
Sensing Wire
Feeder	Electrode Lead
	Work Lead

802 488

15-2. Holding And Positioning Welding Gun

.Welding wire is energized when gun trigger is pressed. Before lowering helmet and pressing trigger, be sure wire is no more than 1/2 in (13 mm) past end of nozzle, and tip of wire is positioned correctly on seam.

		1		1	Hold Gun and Control Gun
					Trigger
				2	Workpiece
			3	3	Work Clamp
		2		4	Electrode Extension (Stickout)
					1/4 to 1/2 in (6 To 13 mm)
				5 Cradle Gun and Rest Hand on
	5				Workpiece
		4
		0°-15°		°	° °
				45	0 -15
90°	90°			45°
End View Of Work Angle		Side View Of Gun Angle		End View Of Work Angle	Side View Of Gun Angle
	GROOVE WELDS			FILLET WELDS
					S-0421-A

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