
Description¡G
CH-88 is
high chrome cast iron electrode. Its weld metal has
martens tic structure and dispersed chrome carbide. It
is suitable for erosive abrasion. Machining is not
available.
Application¡G
Hard surfacing of pump
impellers, sand blasts, conveyor screws and mixer
blades, etc.
Instructions for welding :
-
Preheat at more than
200¢J is required.
-
Postheat at 550 ~ 600¢J
after welding and cool gradually to avoid cracking,
if possible.
-
Under lay with
austenitic stainless electrodes to avoid cracking in
the case of multi-layer welding of 13% manganese
steel and hardenable steel.
-
It is effective with 1
or 2 layer surfacing.
-
Dry the electrodes at
80 ~ 120¢J for 30 ~ 60 minutes before use.
¡@
Typical weld
metal properties¡G (Weld Metal Analysis)
Carbon
¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K 3.00
Manganese ¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K 0.81
Silicon ¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K 1.10
Chromium ¡K¡K¡K¡K¡K¡K¡K..¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K.¡K¡K.. 32.65
Molybdenum ¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K.. 0.71
Vanadium ¡K¡K..¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K.. -----
Tungsten ¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K. -----
Hardness of
weld metal:
650 ~ 800 V.H.N. ( HRC: 55
~ 61 )
Available diameter and recommended operating ranges¡G
¡@
¡@ |
F.
& H. ¡V fillet |
¡@ |
3.2 X350 m/m
4.0 X400 m/m
5.0 X400 m/m |
90 ~ 130 Amps
140 ~ 180 Amps
190 ~ 250 Amps |
|
Type
of power¡GA.C. or D.C.E.P.
Approvals¡G |