25
All-State®
No. 26 Copper
Electrode for Welding Copper and Overlaying Steel DC
Reverse Polarity—Flat Position General
Characteristics High
purity copper deposits on copper base alloys and smooth, easy flowing deposits
on iron base metals are easily
obtained with this electrode. Typical
Applications For
fabricating deoxidized, oxygen free and electrolytic tough pitch copper. It can
also be used to join copper to
mild steel or to overlay steel. High electrical conductivity and corrosion resistance
equal to pure copper will be
produced with this electrode. Ideal for repair or fabrication of bus bars, copper
encased steam kettles, and copper
heat exchange units. Qualities
Tensile strength—up to 35,000
psi (24.61 kgs/mm2) Hardness—25
to 40 Rockwell F Color
match—good on copper Procedures
Base metal to be welded must be clean
and free of oxides. Preheat is very important and the proper temperature
range should be closely maintained
to obtain a sound, porosity-free weld deposit. Heat copper alloys 400°-700°F
(204°-371°C)
(with the exception of silicon bronze which should not be heated above 150°F
(66°C). Pure copper should
be preheated 800°-1000°F (427°-538°C). Due to heat dissipation,
wider groove angles and root openings are
required than with steel alloys. Peening is not necessary but will help to reduce
stresses and distortion.
