The head of the torch
should be inclined at an angle of about 60 degrees to the surface of the
work. The torch handle should extend in the same line with the break
(Figure 35) and not across it, except when welding very light plates.
[Illustration: Figure 35.--Torch Held in Line with the Break]
If the metal is 1/16 inch or less in thickness it is only necessary to
circle along the crack, the metal itself furnishing enough material to
complete the weld without additions. Heat both sides evenly until they flow
together.
Material thicker than the above requires the addition of more metal of the
same or different kind from the welding rod, this rod being held by the
left hand. The proper size rod for cast iron is one having a diameter equal
to the thickness of metal being welded up to a one-half inch rod, which is
the largest used. For steel the rod should be one-half the thickness of the
metal being joined up to one-fourth inch rod. As a general rule, better
results will be obtained by the use of smaller rods, the very small sizes
being twisted together to furnish enough material while retaining the free
melting qualities.
[Illustration: Figure 36.--The Welding Rod Should Be Held in the Molten
Metal]
The tip of the rod must at all times be held in contact with the pieces
being welded and the flame must be so directed that the two sides of the
crack and the end of the rod are melted at the same time (Figure 36).
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