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Just as there is no universal medicine
that will cure all ailments, some cast iron repairs lend themselves
to gas welding better than arc welding. In other cases, arc welding
is more practical than gas welding.
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Types
of applications where oxyacetylene welding is generally
preferred: |
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Small
parts, such as a broken lever.
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Repairs
such as a fracture where both parts to be joined are
loose and free to move.
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Welds
where the weld metal must have the exact, or almost
exact, same properties as the base material. For example,
a glass mold where a weld with dissimilar coefficient
of expansion and contraction could cause a spot or flaw
in the glass.
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In some
machine applications where heat, corrosion, color or
other reasons require that the weld metal have the same
properties as the base metal. For example, valve ports
in cylinder heads.
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| Most engineers would prefer to oxyacetylene
weld any part where facilities are available and it is practical to
preheat, especially on parts where the crack cannot be reached by
an electrode but the iron must be melted in order to obtain access.
For example a crack between valve ports. Here usually only the top
of the crack is reachable. It is therefore necessary to melt down
into the crack in order to weld the complete crack. In such case,
the oxyacetylene torch is naturally used. |
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