Vertical-Down Welding; Machine Set Up For The Self-Shielded Fcaw Process; Welding Techniques For The Self-Shielded Fcaw Process; The Correct Welding Position - Lincoln Electric LTW1 Manual De Instrucciones

LEARNING TO WELD

Vertical-down Welding

Refer to Figure 11 Vertical-down welds are applied at a fast pace.
These welds are therefore shallow and narrow and, as such, are
excellent for sheet metal. Vertical-down welds may be applied by
following a table that is found in the Instruction Manual for lighter
material.
Use stringer beads and tip the gun in the direction of travel so the arc
force helps hold the molten metal in the joint. Move as fast as
possible while still maintaining the desired bead shape.
The important thing is to continue lowering the entire arm as the weld
is made so the angle of the gun does not change. Move the electrode
wire fast enough that the slag does not catch up with the arc.
Vertical-down welding gives thin, shallow welds. It should not be used
on heavy material where large welds are required. Use the vertical up
technique where large welds are required.
FIGURE 11
6
MACHINE SET UP FOR THE
SELF-SHIELDED FCAW
PROCESS
1. See PROCESS GUIDELINES in the OPERATION section
for selection of welding wire and voltage, and for range
of metal thicknesses that can be welded.
2. See the Application Guide on the inside of wire feed
section door for information on setting the controls.
3. Set the "Voltage" and "Wire Speed" controls to the
settings suggested on the Application Guide for the
welding wire and base metal thickness being used. The
voltage control is marked "V" and the wire feed speed
is marked "olo."
4. Check that the polarity is correct for the welding wire
being used. Set the polarity for DC(–) when welding with
Innershield NR-211-MP electrode. See Work Cable
Installation in the INSTALLATION section for
instructions on changing polarity.
5. When using Innershield electrode, the gasless nozzle
may be used instead of a gas nozzle to improve
visibility of the arc.
6. Connect work clamp to metal to be welded. Work
clamp must make good electrical contact to the work
piece. The work piece must also be grounded as stated
in the "Arc Welding Safety Precautions" at the
beginning of the Instruction Manual which is supplied
with each welder.
WELDING TECHNIQUES
FOR THE SELF-SHIELDED
FCAW PROCESS
Four simple manipulations are of prime importance when welding.
With complete mastery of the four, welding will be easy. They are as
follows:

1. The Correct Welding Position

Figure 12 illustrates the correct welding position for right handed
people. (For left handed people, it is the opposite.)
Hold the gun (of the gun and cable assembly) in your right hand and
hold the shield with your left hand. (Left handers simply do the
opposite.)
When using the FCAW Process, weld from left to right (if you are right
handed). This enables you to clearly see what you are doing. (Left
handers do the opposite.) Tilt the gun toward the direction of travel,
holding the electrode at an angle as shown in
Figure 12.
FIGURE 12