Welding Operations, Process Guidelines | Lincoln Electric SP-100

Lincoln Electric SP-100 Welding Operations, Process Guidelines, Sequence of Operation

B-3

OPERATION

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FIGURE B.1a

1	2

The recommended gas and electrode for GMAW is welding grade CO2 gas and 0.025” (0 6 mm) diameter Lincoln L-56 mild-steel welding wire [supplied on 121/2 Ib (6 kg) spools]. For 14 gauge (2,0 mm) and thinner, CO2 gas is recommended because it gives equal or better performance than a blended gas at a lower cost. A mixed gas consisting of 75 to 80% Argon and 20 to 25% CO2 is recommended for welding on heavier gauge [12 gauge (2,5 mm) for example] steel.

The recommended electrode for the self-shielded process is 0.035” (0,9 mm) diameter Lincoln Innershield NR-211-MP on 10 Ib (4,5 kg) spools. This electrode can be used for all position welding of 20 gauge through 5/16” (1 0 – 8,0 mm) thick steel [multi- ple passes are required for 1/4” and 5/16” (6,0 and 8,0 mm)].

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Refer to Figure B-1b.

4.Circuit Breaker - Protects machine from damage if maximum output is exceeded. Button will extend out when tripped (Manual reset).

FIGURE B.1b

WELDING OPERATIONS

PROCESS GUIDELINES

The SP-100 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 electrode process.

SEQUENCE OF OPERATION

WIRE LOADING

Refer to Figure B.2. and B.3.

The machine power switch should be turned to the OFF (“O”) position before working inside the wire feed enclosure.

The machine is shipped from the factory ready to feed 8” (200 mm) diameter spools [2.2” (56 mm) max. width]. These spools fit on a 2” (50 mm) diame- ter spindle that has a built-in adjustable* friction brake to prevent overrun of the spool and excess slack in the wire. The thumb screw at the end of the shaft is not intended to be loosened. It should be tightened full clockwise. NOTE: If full tightening of the spindle thumbscrew causes too much tension in the wire spool, the thumb screw stop point should be adjusted.

*Earlier spindle shafts did not include a set screw to adjust brake friction. If a set screw is desired, order Lincoln part number T12932-2.

Load an 8” (200 mm) diameter spool on the wire spool spindle shown in Figure B.2.

To use 4” (100 mm) diameter spools, the 2” (50

mm)diameter spindle must be removed (See Figure B.3). Remove the thumb screw at the end of the shaft and remove the spindle. The spindle can be stored in the wire feed compartment. A 4’ (100 mm) diameter spool is mounted directly on the 5/8” (16 mm) diame- ter shaft and held in place with the previously removed thumb screw. Make certain that the thumbscrew is