Lincoln Electric NA-5NF, NA-5SF Starting and Stopping Sequences, Means of ARC Striking

B-5 OPERATING INSTRUCTIONS B-5

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11.Set the travel speed as specified by the procedures. With the wire feeder travel switch set to “Hand Travel”, the travel runs without welding, permitting accurate measurement of travel speed. When using a Lincoln travel carriage, adjust the speed with the rheostat and the direction with the toggle switch on the carriage control panel.

12.Connect the work lead to the work or a suitable piece of scrap. Clip the end of the electrode to a sharp point.

13.Preset the “Start” (if used), “Weld”, and “Crater” (if used) controls to the wire speed and voltage specified in the procedure.

14.Make several test welds, readjusting the controls in the following order:

STARTING AND STOPPING SEQUENCES

MEANS OF ARC STRIKING

The NA-5 Codes utilize “hot start” arc striking which operates as follows:

1.With the electrode not touching the work, press the “Start” button.

2.The electrically “hot” electrode inches down as set by the “Inch Wire Speed” control.

3.When the electrode makes contact with the work, the arc strikes and the circuit automatically switches from “Strike” settings to “Weld” (or “Start”, if used) settings.

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NA-5 models above Code 8300 offer both

a.Set the “Arc Striking”, “Inch Wire “hot start” arc striking, as described

	Speed”, and “Volts” controls for				above, or “Cold Start” arc striking which
	optimum	arc	striking.	The	operates as follows:
	optimum strike control settings for				1. Press the “Inch Down” button until the
	most processes will be typically 4
	to 5 volts higher than the weld				tip of the electrode touches the work,
	mode voltage setting and 40% to				automatically stops, and the flux (if
	50% of the weld mode wire feed				used) is automatically dispensed.
	speed setting (possibly lower if				NOTE: If inch speed is set too high, the
	cold starting is used).
					electrode may stop with too much force on
b.	If striking is still not satisfactory,
					its tip, resulting in possible poor starting.
	refer to the section on Setting
	Travel Starting and Stopping or				2. The arc establishes when the “Start”
	IM305 Sec. T3.5.2 for information				button is pressed, and the circuit
	on wire feed motor acceleration.				automatically switches to “Weld” (or
c. If installed, adjust the				“Start	“Start”, is used) settings. Should the
					arc not start immediately, the wire will
	Controls”	to	set the welding
					retract	slightly	until	the	arc is
	procedures for the time set on the
					established and then feed down in the
	timer to provide the bead size,
					normal manner.
	penetration, or other factor as
	needed for the application.				Use either the standard “on-the-fly” travel
d.	If installed, adjust the “Crater				starting or rewire the controls for “standstill”
	Controls”	to	set the welding		travel starting as described in the Setting
	procedures for the set time after				Travel Starting and Stopping section.
	the “Stop” button is pressed to
	provide the bead size or fill the				Optional “Start Controls”
	crater as needed for the
	application.				Recommended for applications				where
e. Set the		“Burnback		Time” to	penetration,	bead	size,	and	other
					characteristics must be carefully controlled
	provide	the	stopping	char-
					at the start.
	acteristics needed.

NA-5