Page 121 - CITS - Welder - Trade Theory

WELDER - CITS

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Electrodes affected by moisture may be baked before use by putting them in a controlled drying oven for
approximately one hour at a temperature around 110 - 150°C. This should not be done without reference to the
conditions laid down by the manufacturer. It is important that hydrogen controlled electrodes are stored in dry,
heated conditions at all times.
Warning: Special drying procedures apply to hydrogen controlled electrodes. Follow the manufacturer’s
instructions.
Remember a moisture-affected electrode:

a has rusty stub end.
b has white powder appearance in coating.
c produces porous weld.
Always pick up the right electrode that will provide:

a good arc stability
b smooth weld bead
c fast deposition
d minimum spatters
e maximum weld strength

f easy slag removal.

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CITS : CG & M - Welder - Lesson 27 - 30