Campbell Hausfeld GR2100 Manual De Instrucciones Y Lista De Piezas página 15

Welding Guidelines (Continued)
STRIKING AN ARC
Place the bare end of the electrode in the holder. Grip the holder
lightly to reduce tiring of the hand and arm.
NOTE: Always keep the jaws of the holder clean to insure good
electrical contact with the electrode.
Be careful not to touch the work piece or
welding bench with the electrode as this causes
arc flashes.
The best method of striking an arc is the scratching method.
Drag the electrode at an angle along the surface much like
striking a match. Upon contact with the plate, lift the electrode
approximately 1/16 inch off the surface or it will stick (See
Figure 5).
NOTE: Should the electrode stick to the work piece, break it
loose by quickly twisting or bending at the holder while pulling
upward. If the electrode does not break loose, disengage the
electrode by releasing it from the holder.
Same as Electrode Diameter
Figure 5 - Scratching Method
ELECTRODE TYPE AND SIZE
Four types of electrodes are recommended for this welder. The
electrodes are commonly known by the AWS (American Welding
Society) designation as follows:
1. E-6011 Deep penetrating
• Flat bead with deep penetrating arc.
• For rusted or dirty mild steel general repair work.
2. E-6013 General Purpose
• All position, smooth deposit rod with low spatter.
• For all mild steel and general purpose work.
3. E-7014 Fast fill
• Smooth bead and fast deposition
• Ideal for joints with poor fitup and general repair work.
4. E-7018-AC High Strength
• Ideal for pipes and structural applications.
• Low hydrogen reduces porosity for a strong weld.
ARC WELDING BASICS
Four basic techniques affect weld quality. These are: amperage
setting, weld angle, arc length, and travel speed. Proper use of
these techniques is necessary for good weld quality.
GR2100, GR2200, GR2300, GR3100, GR3200, GR3300
AMPERAGE SETTING
The correct amperage involves the adjustment of the welding
machine to the required amp setting. This is regulated by a
current range selector switch and a welding current selector
knob. The amperage required depends on the size (diameter) of
electrode used and the thickness of the work piece.
Consult specifications listed on the welder. Excessive amps burn
through light metals and the weld bead is flat and porous (See
Figure 6). The bead appears high and irregular if the amperage is
too low.
ARC LENGTH
Arc length is the distance from the work piece to the tip of the
electrode, the distance which the arc must travel. A proper
arc length is essential to generate the heat needed for welding
(See Figure 6). An arc that is too long produces an unstable arc,
reduces penetration, increases spatter, and causes flat and wide
beads. Too short an arc does not create enough heat to melt the
work piece, the electrode has a tendency to stick, penetration
will be poor, and uneven beads with irregular ripples result. A
1/16 inch
proper arc should be no longer than the diameter of the rod.
The sound of a proper arc is a steady, crisp sizzle, similar to
bacon frying.
TRAVEL SPEED
The travel speed is the rate at which the electrode is moved
across the weld area (See Figure 6). When the speed is too fast,
the bead is narrow and bead ripples are pointed as shown.
When the speed is to slow, the weld metal piles up and the bead
is high and wide. To control travel speed, watch the width of
the weld bead (not the arc) when welding. The weld bead is
the orange, molten metal behind the arc. The width should be
approximately twice the diameter of the welding rod. Control
travel speed to obtain a consistent bead width.
SLAG REMOVAL
removing slag. Hot, flying debris can cause personal injury to anyone
in the area.
After completing the weld, wait for the welded sections to cool.
A protective coating called slag now covers the weld bead which
prevents contaminants in the air from reacting with the molten
metal. Once the weld cools to the point that it is no longer
glowing red, the slag can be removed. Removal is done with a
chipping hammer. Lightly tap the slag with the hammer and
break it loose from the weld bead. The final clean-up is done
with a wire brush. When making multiple weld passes, remove
the slag before each pass.
Wear ANSI compliant safety glasses (ANSI
Standard Z87.1) and protective clothing when
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