5. While continuing to exert moderate pressure with the
shoe, lean the welder to about 60º toward the operator
and start pulling the welder in the same direction of the
weld, at the same time helping the rod into the preheating
tube with light hand pressure (see Figure 5, illustration 2).
This technique requires practice. If the weld progresses too
slowly, discoloration and charring will occur, and the rod
will buckle in the feed tube. If it progresses too quickly, a
cold weld will occur.
6. Continuously observe the condition of the welding rod as
it appears under the shoe as the weld progresses. Uniform
flow lines should be visible along both sides of the rod,
without discoloration or charring.
7. After completion of the weld, the rod can be cut off in two
ways:
a) Withdraw the welder completely so that any
remaining welding rod will slide out of the tube.
The rod can then be cut with a knife or cutting
pliers as close as possible to the end of the weld.
DO NOT allow the rod to lift at the end of the
weld.
b) Bring the welder quickly to an upright position
and push down hard with the point of the shoe.
This action cuts the rod at the end of the weld.
The remaining rod is pulled out of the tube by
hand (see Figure 5, illustration 3).
HIGH-SPEED WELDING FOR PLASTICIzED STRIPS
(CORNER OR FLAT STRIPS)
Follow the same procedure as for round or triangular rod
high-speed welding as previously described, except:
1. Precut the strips to required length to complete the weld.
2. Start the weld by tamping the shoe section of the strip in
the direction of the weld. Do not drag for the first inch of
the weld until the strip appears firm. Then continue weld-
ing with proper downward pressure and speed, showing
slight flow lines along both sides of the strip. If performed
properly, slight flow lines along both sides of the strip will
appear
Figure 6. High-Speed Welding with Plasticized Strips
NOTE:
If the weld progresses too slowly, the strip will soften
excessively and the shoe will stretch the strip. A quick recov-
ery can be made by immediate motion, such as in the start of
a weld, proceeding in the direction of weld at the same time.
Plasticized Strip
Base Material
Flow Lines
High Speed
Tool
Position of
Welder
KS-3
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