SMA(Extra) is a basic coated electrode producing an austenitic manganese steel weld metal which is crack resistant. The weld metal work hardens under impact loads in service and has excellent resistance to abrasion in combination with high impact. It is ideally suited for rebuilding of austenitic manganese steels to enhance the life of these components. The weld deposit work hardens in service and attains maximum resistance to abrasion combined with impact. Some typical applications include crusher jaws, hammer, bucket teeth and lips, manganese steel castings, etc.
1. Re-dry the electrodes at 250-300°C for one hour.
2. Ensure the surfaces to be welded are clean.
3. Work hardened surfaces may require buffer layers using our electrodes like CROMA.
4. Reduce heat input by using:
a. Stringer and short length beads,
b. Short arc and minimum current,
c. Keeping the base material under water partly immersed.
(Three layers deposit on mild steel)
170 240 BHN (As welded)
Work hardens up to 550 BHN (UNDER IMPACT)
|Current Range (Amps)||240-290||170-230||140-180||100-140|
|Weight / Carton (kgs)||20||35||55||75|