Libris Britannia 4/science library(b).zip/science library(b)/ENGINEER/2912.ZIP/23

Text File | 1990-11-12 | 2KB | 303 lines

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   Again, learn  the extremes. Try
another  inch, this  time move  so
slow that you  melt holes into the
steel tube. Do another inch moving
so fast that you apply molten bits
of welding  rod to the  top of the
steel tube which  do not melt into
or become one with the steel tube.
   These bird  droppings have very
little  adhesive power,  the steel
must     all     melt    together.
Ultimately,  the  welder  works on
the very edge of losing control of
the puddle,  where the penetration
of melting  reaches nearly through
to  the  inside   surface  of  the
tubing.
~

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Exaggerated
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Cross section
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shows incorrect bird
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 dropping-like welding
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which is too cold, does
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not mix well with par-
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ent metal  and  has
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no strength
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