PowR-Quip Contractor Serie Manual De Instrucciones página 14

ARC LENGHT
1 The arc length is the distance from the work piece to the
tip of the electrode, the distance which must traverse the
arc. A proper arc length is essential to generate the heat
required for welding (see figure below).
2 An arc that is too long produces an unstable arc, reduces
penetration, increases the spatter and causes flat and wide
beads. A too short arc does not create enough heat to melt
the work piece, the electrode tends to stick, penetration is
inadequate and uneven flanges with irregularities will be.
3 A proper arc should not be greater than the diameter of the
bar. The sound of a proper arc is steady, clear sparking
similar to bacon fry.
TRAVEL SPEED
The travel speed is the speed at which the welding
1
electrode is moving moves along the area (see fig. 7).
When the speed is very high, the bead is narrow and the
curl of the lip are pointed as shown. When the speed is
very low weld metal accumulates and the flange is high
and wide. To control the speed of the displacement, note
the flange (not the arc) when welding.
2
The flange is melted, orange metal behind the arc. The
width should be approximately twice the diameter of the
welding rod. Check the travel speed to obtain an even
flange width.
REMOVAL OF SLAG
USE ANSI (ANSI Z87.1) APPROVED SAFETY
GOGGLES AND PROTECTIVE CLOTHING WHEN
REMOVING SLAG. FIRED HOT REMANENTS CAN
CAUSE PERSONAL INJURY IN ANY AREA.
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1 After completing welding, wait to cool the welded sections.
A layer of protection, called slag now covers the flange
and this avoids that air pollutants react with molten metal.
Once the weld cools to the point that is not red hot, slag
can be removed.
2 The removal is carried out with a hammer chisel. Gently
hit the slag with the hammer and peel of the flange. The
final cleaning is done with a wire brush. When they do
several steps of welding, remove slag before each pass.
WELDING POSITIONS
I t c a n u s e f o u r
1
basic positions; flat,
horizontal, vertical and
over head. Welding
in the flat position is
the easiest of any of
the others because
welding speed can be
increased, the molten
metal has less tendency
to corrode, penetration
can be achieved and the
work is less fatiguing.
Other positions require different welding techniques as
2
dithering, circular step and short length soldering. A high
level of skill is required to perform these welds.
The work must be done in the flat position if possible. For
3
specific applications, refer to the manual of arc welding.
STEPS OF WELDING
1
Occasionally more than one pass
is necessary to fill the joint. The
root pass is first, followed by the
steps of filling and the cover pass
(see above and aside figures).
If the pieces are thick, it might be
2
necessary to bevel the edges that
are attached to an angle of 60
degrees. Remember to remove
the slag after each step.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE