SMA (Extra)
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Hardfacing Electrodes

SMA (EXTRA)

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.

Precaution

1. Redry 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.

TYPICAL CHEMICAL COMPOSITION OF ALL WELD METAL (%)


Element
CMnSi 
P

S

Percent
0.8512.50.600.0250.018


HARDNESS:

 (Three layers deposit on mild steel)

170 240 BHN (As welded)

Work hardens up to 550 BHN (UNDER IMPACT)

CURRENT & PACKING DATA: AC / DC (+)


Size (mm)
6.3x450
5x450
4x350
3.15x350
Current Range (Amps)
240-290
170-230
140-180
100-140
Weight / Carton (kgs)
20
3555
75


Hardfacing Electrodes

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