Lincoln Electric SVM 117-A Connect Output Components GUN Liner and Contact, Installation

		A-7	INSTALLATION		A-7
TOC	TOC	CONNECT OUTPUT COMPONENTS		GUN LINER AND CONTACT	TIP
				INSTALLATION
Section	Master	INSTALL THE WORK CLAMP
				The Magnum 250L gun and cable provided with the
to	to	Attach the work clamp to the cable which extends from		WIRE-MATIC 250 is factory installed with a liner for a
		the front of the machine using the following procedure:		.035-.045” (0.9-1.2mm) diameter electrode and an
Return	Return
				.035” (0.9mm) contact tip.
		1. Insert the lug on the end of the work cable through
			the strain relief hole in the work clamp handle. See	1. If a .045” diameter wire size is to be used, install
			Figure A.7.	the .045” contact tip (also provided).
		2. Slide the work cable through the hole up to the bolt		2. For other wire sizes, use the following procedure
			and nut.	for contact tip and gas nozzle installation.	See
				Figure A.8.

3. Fasten work cable using the bolt and nut provided.

TOC	TOC	a.	Choose the correct size contact tip for the
			electrode being used (wire size is stenciled on
Section	Master	b	the side of the contact tip) and screw it snugly
			Be sure the nozzle insulator is fully screwed
			into the gas diffuser.
to	to		onto the gun tube and does not block the gas
Return	Return		holes in the diffuser.
		c.	Slip the appropriate gas nozzle onto the noz-
			zle insulator. Either a standard .50" (12.7mm)
			or optional .62” (15.9mm) I.D. slip-on gas noz-
			zle may be used and should be selected
			based on the welding application.
		d.	Adjust the gas nozzle for the GMAW process
		FIGURE A.7 - Installing The Work Clamp.	to be used.

TOC	TOC	OUTPUT POLARITY CONNECTION	For the short-circuiting transfer process, the contact tip
Section	Master		end should be flush to extended to .12" (3.2mm). See
			Figure A.8.
to	to	WARNING	For the spray transfer process, the contact tip should
			be flush to recessed .12" (3.2mm). See Figure A.8.
Return	Return	Turn the welder Power Switch OFF before chang-
		ing output connection.
		____________________________________

The welder is shipped from the factory connected for electrode positive (+) polarity. This is the normal polar- ity for GMA welding.

		If negative (-) polarity is required, interchange the con-
TOC	TOC	nection of the two cables located in the wire drive com-
		partment near the front panel. The negative lead is the
Section	Master	lead closest to the front panel (where the leads come
		out of the floor of the compartment) and should be
		reconnected to the brass conductor tube of the gun
to	to	connector. The positive lead is stamped (+) on its ter-	FIGURE A.8 - Contact Tip and Electrode
		minal and should be reconnected to the work lead ter-
Return	Return		Connections.
		minal.
		WIRE-MATIC 250