Hard Facing welding electrode type HV350 
3.2mm Diameter - 5kg Pack Weight

PRODUCT DESCRIPTION 
The design emphasis of the alloyed weld metal ensures the desired hardness level of the specification is readily achieved as is the deposits maximum resistance to impact loading combined with medium resistance to abrasion. The flux contains the appropriate alloying elements plus iron powder addition and is extruded onto a ferritic wire with a balance of silicates that ensures both coating strength and resistance to moisture absorption.

WELDING FEATURES OF THE ELECTRODE
The electrode is suitable for both AC and DC and is used to best advantage in the flat and HF positions. The arc is smooth and stable weld beads are evenly rippled, of bright appearance and the slag readily detachable. The weld deposit is highly crack resistant under normal circumstances, but on high carbon cast steels or restrained sections of mild steel, a pre-heat of 150°C should be used.

APPLICATIONS AND MATERIALS TO BE WELDED
The main applications occur when intermetalic abrasion is involved, eg: to control wear in interconnecting steel components such as gear wheels, shafts, sprockets, couplings etc. The deposit is machinable thus enabling worn or broken sections to be rebuilt and then reshaped. Similarly the repaired component may be oil quenched to increase hardness or may be case hardened by conventional practices.
WELD METAL ANALYSIS COMPOSITION % BY Wt.

                   C      Mn       Si       S       P       Cr       Mo       V       W        Fe
MIN             0.2    0.4       -         -        -       1.0       0.1       -         -
MAX            0.3    1.2     0.8     0.03   0.03   2.0       0.3       -         -
TYPICAL    0.25   0.5     0.6     0.02   0.02   1.2      0.2     0.02   0.007    Bal.

WELD METAL HARDNESS (ALL WELD METAL)
AS WELDED 150^oC
PRE-HEAT             HRC            HV           QUENCHED              TEMPERED
1 st Layer                 24              260              850^oC                       650^oC HV 
2 nd Layer                32              320                                   HV
3 rd Layer                39               380            300 – 500                    290 – 310
Heat input, cooling rate, and dilution will affect hardness in the first two layers but
no significant affect in next layers

WELDING AMPERAGE AC or DC+
Ø mm              2.6               3.2               4.0                     5.0
MIN                  60                90               140                    190
MAX                90                140              180                     240

OTHER DATA
Electrodes that have become damp should be re-dried at 150^oC for 1 hour.