IMPORTANT: If a blade has been cut by using snips, the ends of the blade must be ground square before welding them together, as shown in Figure 17.
Removing Teeth
In fine pitched blades, one or more of the teeth on each side of the cut may need to be removed by grinding so that the weld area of the blade is uniform and the teeth will be uniformly spaced. See Figure 16.
Welding
4.Carefully clean the ends of the blade which will contact the welder jaws. Remove any dirt, oil, scale and oxide.
Any rust (oxide) on the blade in the vicinity of the weld must be ground off before the blade can be welded.
5.Turn pressure knob to “0” position (pointed downward). NOTE: There will be some resistance when turning the knob.
6.Insert one end of the blade in the left clamp (Figure 18). Position the back edge of the blade against the back edge of the left clamp. Then position the end of the blade midway between the left and right clamps. Tighten the left clamp.
7.Insert the other end of the blade in the right clamp. Position the back edge of the blade against the back of the right clamp. Then butt the end of the blade against the other end of the blade (the blade ends need to be in contact with each other). Tighten the right clamp.
8.Set the pressure selector switch (counterclockwise rotation) to the approximate setting required for the width of the blade being welded.
Keep hands clear of the weld area and the clamp jaws during welding.
9.Press and hold the weld button (Figure 18). When the weld button is pushed, the left clamp moves to the right to apply pressure to the blade ends. At the same time, sparks will come from the blade ends as they are being welded. Do not release weld button until the blade joint is “red hot.”
10.Release the weld button, and wait 3 or 4 seconds until blade returns to original color. Unclamp the blade.
11.Rotate the pressure selector switch back to “0”.
Figure 17
Figure 18
17