Joining And Build-Up - NPK M20S Instruction Manual

GENERAL MAINTENANCE
REPLACING THE PIERCING TIP
Place the new tip into the seat area. Use a straight edge to position the tip before
tacking it into place. Place the straight edge against the face of the cutting blade and
maintain the alignment to the side edge of the replaceable tip.
Fig. D
Fig. C
Move tip squarely against the edge, making sure it is level, see Fig. C. Tack firmly in
place, see Fig. D, cycle the processor jaws to check the clearance of the new tip. The
leading edge of the tip should pass within .045" (1.14 mm) of the upper lip of the female
jaw. NOTE: Some grinding may be required to fit the tip properly to the tunnel, see
Fig. E.
Fig. E
1. Remove the worn tip by carbon arcing or torch cutting.
2. Prepare the surface for the new tip by grinding away any remaining slag.
3. Place the new tip into its proper location.
4. Dry welding rod to 300°F + (150°C +).
5. Preheat the weld area to 300°F - 400°F (150° - 200°C).

JOINING AND BUILD-UP

For joining, stringer beads are the best. For build-up, weaving is acceptable. Use one
of the following rods (or wire equivalent) or equal: Airco Austex 361, Cronatron 7770,
Eutectic 3205, Hobart Smooth Arc MC, McKay Chrome-mang, and Stoody 2110.
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