Lincoln Electric IM10024 manual Operation, Loading of Wire, K148 Nozzle Installation

Electrode

Tang

Contact

Tip

Straighten the start end of the coil for at least eight inch- es, pass the end down through the appropriate wire straightener. Inch the wire through the wire feeder and the nozzle. When using .062 (1.6 mm) or 5/64 (2.0 mm) Innershield electrode with a K148-C nozzle, make sure that the wire is in the “vee” groove of the pressure tang. For the .062 (1.6 mm) and 5/64 (2.0 mm) wire sizes, it may be necessary to back off on the idle roll pressure so that there is little or no flattening of the wire.

Because the electrode is held against one point of the contact tip, it wears a groove at that point. When the groove is about one half the diameter of the electrode, rotate the contact tip to a new position per the instruc- tions below. Careful positioning of the contact tip will provide four to six wear spots depending upon the elec- trode size.

When welding with the small diameter electrodes, it will be necessary to change contact position more frequent- ly since the amount of tip wear that can be tolerated is much less. The tang should never be allowed to touch the I.D. of the contact tip. If the groove is allowed to wear until the tang touches the I.D. of the contact tip, welding current passes through the tang. This causes electrical wear and overheating of the tang and the con- tact tip. See Figure C.7.

FIGURE C.7

C-5		ACCESSORIES		C-5
10.	Line up the lower spot in the center guide tube (G)		Operation
	with the 3/8” (9.5 mm) set screw (H) and tighten the		The same contact tip, S13763, is used for 3/32” (2.4
	screw securely.
11.	Replace the brass thread protecting collar (E). It is		mm) through 3/16” (4.8 mm) diameter electrodes.
			S16388 is used for .062 (1.6 mm) and 5/64 (2.0 mm)
	important that this protecting collar be pulled up		electrode.
	against its locating shoulder, otherwise the tip lock-
12.	ing nut will not clamp the tip securely.		Loading of Wire
	Replace the contact tip and its clamping nut (D)
13.	and tighten securely.
	Assemble the proper combination of extension
	guides (Items 12, 13 and 14) with locking nut (Item
14.	11) for the welding procedure to be used.
	For Submerged Arc welding, screw the flux hose
	clamp (Item 10) onto the extension housing.

K148 Nozzle Installation

To install the nozzle on the head, insert the outgoing wire guide from the head into the nozzle assembly. Place the combined assembly in position on the bottom of the wire feed roll box. Clamp it in place using the two clamps supplied with the head.

Before pulling the clamps up tight the nozzle must be positioned relative to the travel direction as shown in Figure C.6. This position is set so accidental contact between the work and the nozzle will not compress the contact pressure spring. If positioned otherwise, such accidental contact may cause arcing inside the contact tip.

After the nozzle is positioned in the proper relationship with the travel direction, the connector tab for the elec- trode cables can be moved to any of four positions 90 degrees apart. To change the tab, remove the two 1/4- 20 hex head screws. ap the connector tab to loosen it from the tapered collar on the nozzle body. Turn the tab to the desired position. Replace and tighten the 1/4-20 screws.

FIGURE C.6

Nozzle

Pivot

Connector

Tab

New	Time to	Too Late
	Rotate

Lock ni g

Nut

Con t cta

Tip

Contact

Pressure

Spring

Nozzle

Travel

Work

Travel

Toup rotateuntil ittheis freetip, clipof thethe contactend of thetip.electrodeLoosen theandlockinginch it nut about one-half turn and pull the nozzle body to relieve the pressure of the tang against the inside of the contact tip hole. At this moment rotate the tip the proper amount and then retighten the locking nut.

MAXSA™ 22 & 29 WIRE DRIVES