Description:
Product Name
Nominal Hardness
Type of covering
Pol
Features
WP
HF-600
HV 800
Graphite
AC,DC-EP
F EX
Identification Color
Product name
1st
2nd
HF-800K
Orange
Yellow
Composition(%)
C
0.80
Si
1.65
Mn
1.24
Cr
3.82
Mo
-
V
2.42
W
0.29
Diameter and length (mm)
Dia.
3.2
4.0
5.0
6.0
350
400
450
Common to individual welding processes
- Preparation of base metal:
Rust, oil and soil attached on the base metal may cause blowholes.
- Preheat and interpass temperature:
In order to minimize cracking, control of preheat and interpass temperature is a key technique
- Immediate postweld heating:
Heating the weldment at 300-350oC for 10-30 Minutes. Control the temperature carefully, or the hardness of the weld will be decreased.
- Postweld heat treatment:
Postweld heat treatment(PWHT) at 550-750oC is effective to prevent cld cracking and distortion in service.
- Underlaying:
Underlaying is effective to prevent cracking in weld here low-alloy steel having high hardenability is hardfaced or where high-hardness weld metal is deposited on carbon steel.
- Penetration:
In hardfacing, the properties of the weld metal will considerably be affected by welding penetration into the base metal.
- Welding distortion:
Intermittent and symmetrical welding sequences are effective to minimize welding distortion.
