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| COBALARC |
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| Cobalarc - the future of hardfacing. This range of tubular
electrodes gives a host of advantages over conventional
coated electrodes in respect of hardfacing applications
owing to its unique features. |
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- The prime weapons that provide the hardness in
hardfacing deposits are the metallic and non metallic
carbides. In coated electrodes, the carbides are
formed at the time of welding. Carbides, preformed,
cannot be used in these electrodes because the
high hardness renders them difficult to produce.
But, Cobalarc electrodes have the advantage that
the preformed carbides are put inside a hollow mild
steel tube
- In hardfacing controlling the heat input is important
because greater dilution will lower the hardness of
the deposit. In this respect, Cobalarc gives a major
headway because only a thin walled tube has to be
melted instead of a solid wire. So the heat requirement
will be considerably less and automatically the heat
input will really be low
- The low heat input also reduces the heat-affected
zone in the base metal
- Cobalarc provides economy as the total loss involves
only butt end loss and very negligible slag loss.
Moreover, the butt end does not contain any carbide
inside - it is only the hollow tube that is lost, so the
actual loss is even lower
- The slag formation is very small in Cobalarc. So
the welder can apply the next run without wasting
any time for deslagging. This gives an immense
advantage of speed and productivity. So in 1 hour
of arcing, Cobalarc gives 2-2.5 times the weight of
deposit than coated hardfacing electrodes
- A near absence of slag does not mean that
Cobalarc deposits are exposed to the atmosphere
for oxidation. The outer coating contains ingredients
that burn in the welding arc and generate copious
amount of fumes, which provides the shielding to the
weld pool
- This outer coating has one more function. Since it
contains non-hygroscopic stabilizers the mild steel
tube is free from rusting giving these electrodes an
indefinite shelf life. The rigid tube also protects the
preformed carbides from degeneration over time
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| More Info... |
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