Prepare The Work; Optimizing Feeding - Lincoln Electric INNERSHIELD Series Welding Instruction Manual

WELDING PREPARATIONS

PREPARE THE WORK

Clean the joint by removing excessive scale, rust, moisture, paint,
oil and grease from the surface. As with all welding applications,
joint cleanliness is necessary to avoid porosity and to attain the
travel speeds indicated in the procedures.
Tack weld with Innershield wire or Fleetweld® 35LS, Jetweld®
LH-70 or Jetweld 2 manual stick electrodes. If other electrodes are
used, Innershield slag removal may be difficult in the area of the
tacks.
The work connection can be placed either at the beginning or at
the end of the weld, depending upon the application. If necessary,
try different locations until the best weld quality is obtained.
Clamp the work cable to the work so there is a positive and clean
metal-to-metal contact point. Poor work connections raise system
voltage losses and can result in convex or ropey beads typical of
low voltage, even if the machine meters indicate proper voltage.
Never use undersize or badly worn work cables. Choose the
cable size per the following table:
Current Amps
60% Duty Cycle
300
400
500
600
(1)
mm 2 equivalent according to IEC (International Electrical Code).

OPTIMIZING FEEDING

Most feeding problems are caused by improper handling of the
gun cable or wire.
1. Do not kink or pull the cable around sharp corners. Keep the
gun cable as straight as possible when welding.
2. Do not allow two-wheelers, fork lift trucks, etc. to run over the
cables.
3. Keep the cable clean per instructions in the wire feeder
operating manual.
4. Innershield wire has proper surface lubrication on it. Use only
clean, rust-free wire.
5. Replace the nozzle contact tip when it becomes worn or the
end appears fused or deformed.
Total Work and Electrode Cable Length
0-50 ft. (0-15m)
(50mm 2 )
1
(70mm 2 )
2/0
(70mm 2 )
2/0
(95mm 2 )
3/0
– 17 –
50-100 ft. (15-30m)
(50mm 2 )
1
(70mm 2 )
2/0
(70mm 2 )
2/0
(95mm 2 )
3/0
(1)