WELDFAST SERIES
WELDING CAST IRON TO CAST IRON & TO OTHER METAL
 
WELDALLOY CI WELDALLOY 521  
WELDALLOY 511 WELDALLOY 531  
 
Product Name / Specification
Characteristics
Useful Welding Technique Technical Data Principal App. Areas
WELDALLOY CI
A Low Cost Cast Iron Electrode Where Machinability is Not Essential.
WELDALLOY CI has a specially formulated, which
gives smooth, dense, high strength, porosity free deposit even on old and dirty cast irons. It is an all position electrode, which can be used on all types of cast iron. The deposit, however can not be
machined. The deposit has excellent colour match with parent metal and match evenly with the
casting.
Clean the area to be welded of dirt, grease, oil, scale or oxide. Whenever possible for best results, preheat the casting to about 150°C. Maintain the interpass temperature to the same level. Use short arc and stringer bead technique to minimize localized heating of casting. Peen the deposit
when hot to minimize shrinkage stresses. Use
lowest possible current.
Tensile Strength : 38-42 kgf/mm2
This electrode can be used for repairs of all types of cast iron where machinabilty of deposit is not an essential requirement. It can be used for welding
machine bases gears cams, valve bodies, foundry castings, non machinable motor or generator housing, building up worn out cast iron components
subjected to abrasive wear . The electrode is ideal for joining cast iron to steel.
Product Name / Specification
Characteristics
Useful Welding Technique Technical Data Principal App. Areas
WELDALLOY 511
A High Nickel Electrode for Cold Welding of Cast Iron for Machinable Deposit.
WELDALLOY 511 is an ideal electrode for cold
welding of cast iron. It deposits a machinable
weld which bonds to cast iron in a smooth and flat
way. The deposit has very little mixing with base
metal. Since the electrode operates on low voltage and current, the heat input to the base
metal is minimum. When properly made the welds are free from porosity and cracks.
Clean area to be welded of grease, oil and dirt. Weld with short arc using lowest possible current for good dense deposit. Direct the arc on weld pool with correct manipulation. The molten pool is brought forward over the surface of cast iron in a manner resembling to brazing. Peen the hot bead to reduce shrinkage stresses.
Tensile Strength : 35-40 Kgf/mm2
Elongation (Typical) : 15 %
Hardness : 150-180 BHN
For cold welding of grey cast iron to itself or to steel. Also suitable for surfacing cast iron parts subjected to erosion, corrosion and high temperatures. It can
be used for repairing intricate cast iron parts, water pump housing, electric motor bodies, machine frames, cylinder blocks. gears, pulleys, sugar mill rollers, glass moulds, cast iron dies, coupling, oil sump etc.
Product Name / Specification
Characteristics
Useful Welding Technique Technical Data Principal App. Areas
WELDALLOY 521
An Electrode for All Weldable Cast Irons.
WELDALLOY 521 is an ideal electrode for welding all weldable cast irons. It is also useful on casting
with relatively high phosphorous. The electrode welds with a mooth, stable arc giving a flat, dense and crack free deposit. This electrode yields a bond strength more than that of WELDALLOY 511
and WELDALLOY 531.
The surfaces to be welded should be free from grease, oil dirt and paint. Avoid localised heat input by operating at lowest possible current, stringer beads and skip weld technique. Maintain
low interpass temperature.
Tensile Strength : 35-40 Kgf/mm2
Hardness : 180-210 BHN
The superior bond strength and crack resistance makes the electrode useful for heavy work pieces or
where higher stresses occur like machine frames, lathe beds, cast iron dies, valve bodies, foundry defects, pump casing, differential housing etc. It is also used for joining of ferritic and pearlitic high strength irons such as malleable mechanite and ductile irons and also for welding these types to
steel.
Product Name / Specification
Characteristics
Useful Welding Technique Technical Data Principal App. Areas
WELDALLOY 531
Nickel Alloy Electrode for Welding Cast Iron.
WELDALLOY 531 is a low heat input electrode for
welding cast iron without preheating. The welds are sound and strong. Both the weld and heat affected zone (HAZ) are machinable.
Clean area to be welded thoroughly of any surface contamination, use short weld runs. Peen the weld deposit after welding. For repair of old castings remove entire defective portion to reach sound metal before welding.
Tensile Strength (Typical) : 35 Kgf/mm2
Hardness : 160-170 BHN
WELDALLOY 531 is ideal for repairing cracks in cast iron parts in-situ and without dismantling, joining of
broken cast iron parts, rectification of foundry
castings, gear box and differencial housing, sugar mill rollers, glass moulds, rebuilding worn out surfaces, gear teeth, pump impellers etc.
 
 
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