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YOUR
WELDER
and what it will do = °.
Your CRAFTSMAN Arc Welderis a sturdilyconstructed end thoroughlytestedmachineengineered to
give many years of efficient trouble-free service. It is listed by Underwriters' Laboratories,
incorporated,which meansthat it passes all requirements of safety,fire hazardand temperaturerise
limits asspecified in theirStandard for Transfer-TypeArc-Welding Equipment,
HOW THE CRAFTSMAN ELECTRODE
SIMPLIFIES WELDING
Craftsman
Contact
Electrode is self-starting-plus automatic
restarting , The electrode startson contacL
Craftsman Contact Electrode is serf-cleaning..... Under normal
conditionsthe slagremovesitselfasthe weld cools, Spatter is almost
nen-existenL Craftsman Contact Electrode has an exceptionally
good appearance _
With fine ripple, unusually clean, smooth
appearance, a ndreduced slaginclusions
Craftsman Contact Electrode deposits more metal faster
. Because
the powdered iron in the flux goesinto tile weld_
1
Beth edges of the metal
are heated by the arc,
until --
3
mere molten metal and
flux is added from the
rod, which-
2
they melt and flow
to
gether forming one piece,
instantly --
4
fills the crater andcovers
the top of the weld with
slag,
5
This process continues the entire length of the weld
Arc Welding is the process of fusing two or more pieces of
metal together
to form one piece. It is accomplished
by
heating adjacent metal surfaces to the melting point with an
electric
arc, then adding
a sufficient
amount
of molten
metal to provide reinforcement
and fill any vacant space
between the parts being joined, as shown in the accompany-
ing illustrations
The arc is created when an electric current, regulated
by
a welding transformer, flows across an air gap between an
electrode
and the work being
welded,
The intense heat
generated
by the arc is ideally
suited for welding,
as it
can be directed to affect only the part of the metal to be
welded, Uniform heat from the arc, is acquired by keeping
its length the same for a given rod size and current setting,
At the instant an arc is "struck",
a portion
of the base
metal directly
beneath it, is melted,
resulting in a small
pool of molten metal, some of which is forced out by the
blast of the arc and deposited along
the weld path, The
depth of the crater thus formed,
is the distance the weld
will extend into the base metal and is referred
to as the
penetration
of the weld
Some of the electrode (which consists of o metal rod sur-
rounded
by a flux coating)
is melted simultaneously
with
the base metal and is carried by the arc to the liquid pool
This added
metal combines with the base metal to form
the deposited weld,
During th_s operation
a part of the flux coating burns off
and forms a gaseous smoke screen that completely
en-
velops the arc, protecting
the molten metal from harmful
effects of oxygen and nitrogen in the surrounding
atmos-
phere, The remainder
of the flux
coating
that melts is
carried
to the molten pool where it mixes with the metal
to combine
with various impurities It then floats to the
surfaces to form a coating of slag which covers the de-
posited weld metal, protecting
it from the atmosphere and
retarding
its cooilng
I-3
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