10
Continued on next page...
ERCuSn-C (All-State Phosphorus Bronze
C) – This wire is used in place
of the ERCuSn-A wire electrode where
greater hardness, tensile strength and yield strength are required. Postweld heat
treating is necessary
to achieve good ductility. On copper-zinc alloys, a better color match between
the base plate and weld
will be achieved with ERCuSn-C. ERCuA1-A2
(All-State Aluminum Bronze A2) –
ERCuA1-A2 electrodes are extremely useful as they can
be used to weld a variety of copper
alloys and ferrous metals. Because of the higher aluminum content and
iron additions, the resulting weld will
be stronger and harder than that of an ERCuA1-A1. Materials welded
with this wire are aluminum bronzes
of similar chemistry such as alloys 612, 613, and 618. Yellow brasses,
high-strength copper zinc alloys, silicon,
bronze, carbon steel and copper or copper alloy clad steel can also
be welded. High aluminum content castings,
such as alloys 952 and 958, are also welded with this wire.
They can also be used for wear and
corrosion-resistant surfacing. Flux-Cored
Carbon Steel Electrodes Selection
of a flux cored wire for welding carbon steels is usually based on the operating
characteristics of the
wire and mechanical properties of the weldment. Summarized below are the operating
characteristics to be
found in flux cored wires belonging to various AWS A5.20 classifications.
E70T-1 (Dual Shield 111AC) GENERAL
PURPOSE – This wire is formulated
with a rutile base slag system which
yields a smooth arc, low spatter and a light, easy peeling slag. It is capable
of making flat fillet welds with
equal legs in the horizontal positiop. These wires contain moderate amounts of
deoxidizers making it usable
in multi-pass welding. E70T-1/T-9
(Dual Shield R-70 Ultra) DOWNHAND –
This wire has been formulated for optimum performance
on heavier rust and mill scale. It contains high amounts of deoxidizers for use
over rust and mill
scale. This wire is characterized by low smoke, high deposition efficiencies 88%,
and fluid slag. Because
the puddle is fluid, this wire tends to produce convex horizontal fillets that
make clean-up minimal. E70T-2
(Dual Shield SP) SINGLE PASS –
Most E70T-2 wires contain high amounts of deoxidizers to
tolerate substantial rust and millscale.
Thus, their multiple pass strengths typically exceed 100 ksi UTS.
They perform well at high travel speeds,
but are not recommended for multi-pass use.
