will usually break. A rod in this c

will usually break. A rod in this condition is impossible to control and will make a poor weld. When this
occurs, the welder should be quickly withdrawn, and the rod cut with pliers or twisted off a the last point
where good adhesion or bonding occurred. If the rod is not removed quickly enough, some residue will
usually be left in the pre-heating tube. This may be removed by pushing a cold rod back and forth through
the tube until it is cleared.
As in hand welding, absence of flow lines indicates a ‘‘cold’’ and unsatisfactory weld.
11. Observe the emerging rod constantly, so that corrective action can be taken immediately, as soon as
unsatisfactory conditions are evident.
12. If the rod is stretching, the weld is going too slowly and the rod is overheating. When this occurs,
withdraw the welder, cut off the rod, and make a new start before the point where the rod started to
stretch excessively. If flow lines do not occur, the weld is going too fast, and adequate bonding is not
taking place. In this case, recovery can sometimes he made by bringing the welder back up to an angle of
ninety degrees, and continuing at that angle for a few inches, gradually bringing it back down to the sixtydegree
angle. Any poorly welded section must be completely removed and rewelded before proceeding.
The rate at which the weld proceeds is governed by the temperature, the consistency of the rod, and the
angle of the welder.
13. Make sure that the pre-heating orifice in the high-speed tool is aligned exactly in the direction of the
weld, so that the pre-heated rod will bond into the center of the pre-heated base material.
14. To stop a high-speed weld:
Withdraw the welder quickly until all welding rod is out of the tube, or bring the welder quickly to the
ninety-degree angle, so that the sharpened edge of the shoe will bear on the softened top surface of the
rod. Press down toward the base material. This will cut the rod. Quickly remove rod from the tube.
15. A good single ‘V” speed weld will have a slightly higher crown than a hand weld, and will have a much
more uniform and smoother appearance than a hand weld, and the flow-lines will usually be
somewhat less prominent.
16. The pre-heating tube must be kept clean. The shoe should be cleaned with a soft wire brush to