Description

A uniquely formulated cast iron electrode producing deposits with superb machineability.

Procus 999 is a specifically designed cast iron electrode which exhibits exceptionally low temperature welding characteristics but a high elongation to compensate for cooling stresses.

• weld deposits are very easily machined.
• super out-of-position welding characteristics.
• high elongation significantly reduces the dangers of weld failure.
• superb ac and dc arc characteristics.
• welds all types of cast irons, including grey cast.

The smooth arc and fine welding characteristics of procus 999 makes it the ideal electrode to weld all types of cast irons.

A cast iron welding electrode with a specially developed flux coating which enables low temperature input during the welding process and provides for excellent machineability of the weld deposit.

All cast irons are characterised by a carbon content of 3 to 4% which, while solidifying, separates in the matrix and, depending upon the shape and form of the carbon, also the microstructure.

Thus the cast iron properties are determined. The welding of some of these cast irons is immensely difficult unless an electrode that can compensate for the cooling stresses is used.

Procus 999 is, because of its high elongation, such an electrode and so aids and simplifies the welding of many cast irons, particularly grey cast iron.

When ordinary electrodes are used to weld cast irons the weld metal becomes hard and brittle because the carbon content from the dilution results in martensite and iron carbide formation during solidification. The stresses created in the heat effected zone are often related to the high amperages required to run the electrode and by the migration of carbon into the weld metal, making the weld deposit hard, low in elongation and almost impossible to machine.

The special flux formulation of procus 999 cast iron electrode is designed to allow the electrode to run at low temperatures, with either ac or dc and in all positions. The weld metal of procus 999 can dissolve high levels of carbon and iron from the base material without becoming hard and brittle, even under rapid cooling conditions and so making the weld machineable. Additionally, the alloy composition of the weld metal has a coefficient of thermal expansion to that of cast iron, which is a further advantage in reducing welding stresses.

Tensile strength – up to 345 mpa (50,000 psi) as welded
Yield strength – up to 275 (40,000) mpa
Elongation in 50 mm (2·0″) = 24% to 27%
Machineability – excellent