Lincoln Electric IM788 manual Changing Machine Over to Feed Other Wire Sizes, Process Guidelines

B-6 OPERATION B-6

9.To stop welding, release the gun trigger and then pull the gun away from the work after the arc goes out.

10.When no more welding is to be done, close valve on gas cylinder (if used), momentarily operate gun trigger to release gas pressure, and turn off the SP-135 PLUS.

Cleaning Tip And Nozzle

Clean the contact tip and nozzle to avoid arc bridging between the nozzle and contact tip which can result in a shorted nozzle, poor welds and an overheated gun. Hint: Anti-stick spray or gel, available from a welding supplier, may reduce buildup and aid in spatter removal.

PROCESS GUIDELINES

The SP-135 PLUS can be used for welding mild steel using the GMAW, single pass, process which requires a supply of shielding gas or it can be used for the self shielded, Innershield® process (FCAW).

The recommended gases and electrodes for GMAW are welding grade CO2 gas or an argon-CO2blended gas (75 to 80% argon and 25 to 20% CO2) and .025" (0.6 mm) diameter Lincoln Super Arc L-56 mild-steel welding wire.

The recommended electrode for the self-shielded process is 0 . 035” (0,9 mm) diameter Lincoln Innershield NR-211-MP. This electrode can be used for all position welding of 20 gauge through 5/16” (1,0

–8,0 mm) thick steel [multiple passes are required for 1/4” and 5/16” (6,0 and 8,0 mm)].

WARNING

Use of the GMAW process with the SP-135 PLUS on thicker materials than recommended may result in poor welds. The welds may “look” good, but may just be “sitting” on top of the plate. This is called “cold casting” and will result in weld fail- ure.

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The SP-135 PLUS is suitable for .035" Aluminum wire and .030" stainless wire. Refer to Table B.1 for Recommended Procedure Settings. Aluminum wire requires K663-2 Aluminum Welding kit. See ACCES- SORIES section.

CAUTION

It is important when changing between welding with steel wire and aluminum to exchange feeding components due to the lubricant applied to steel wire. Failure to do so may result in contaminated welds when welding aluminum.

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TABLE B.1 — SP-135 PLUS Welding Procedures

		Shielding		Voltage/Wire Speed
Process	Welding Wire	Gas	22 ga	16 ga	12 ga	1/8”	3/16”	1/4”
	.035 Dia(0.9mm	100% Argon	C-5	E-8.5	H-10	J-109	NR	NR
4043	Aluminum Wire
MIG DC+
			16 ga	14 ga	12 ga	10 ga
	.030 Dia	98% Argon/	A-3	C-6	D-7.5	D-7.5
	308L Stainless	2% Oxygen
	Steel Wire
NR-Not Recommended

CHANGING MACHINE OVER TO FEED OTHER WIRE SIZES

The SP-135 PLUS is shipped from the factory ready to feed 0.023-0.025” (0,6 mm) diameter wire. To operate the SP-135 PLUS with other sizes of wire, it is neces- sary to change the contact tip and change the drive roll over to other sizes. Refer to Changing the Contact Tip and Changing the Drive Roll, in the MAINTE- NANCE section, for specific information on these pro- cedures.

WELDING WITH FCAW (Innershield)

Welding with Innershield requires an Innershield Welding Kit. A gasless nozzle is provided in the Innershield Welding Kit. When using Innershield elec- trode, installing the gasless nozzle will improve visibili- ty of the arc and protect the gas diffuser from weld spatter. Additionally included is a gun cable liner to permit proper feeding of .035” (0,9 mm) Innershield wire. Refer to the ACCESSORIES section for details on obtaining this kit.

SP-135 PLUS