DESCRIPTION
The deposited metal of VHF-800 / VHF-800K is martensitic structure which contains C, Cr, W and B as principal alloy elements. It has extremely high hardness caused by precipitation of chrome carbide and chrome boride. It is most suitable for overlaying of the parts subjected to heavy soil abrasion.
APPLICATIONS
Hard surfacing of pump casings and cutter knives etc.
INSTRUCTIONS FOR WELDING
1.) Usually over 200ºC preheating and 500~600ºC postheating are required.
2.) Take care of the increase of cracking tendency when used for over triplelayer welding.
3.) Underlaying with low hydrogen type electrodes (N-7016 or N-7018) is required.
4.) Dry the electrodes at 150~200ºC for 30~60 minutes before use.
TYPICAL ANALYSIS OF ALL WELD DEPOSIT:
C |
Si |
Mn |
Cr |
Mo |
B |
W |
|
|
0.82 |
1.88 |
1.33 |
3.87 |
- |
0.38 |
2.54 |
|
|
HARDNESS:
as welded: 740-820 Hv / 62-65 HRC / 84-90 HS
600 deg C x 1 hr SR 520-550 HV / 50-52 HRC / 67-70 HS
RECCOMENDED CURRENTS: Ampere (AC/DC+)
Size |
Dia |
3.2 |
4.0 |
5.0 |
(mm) |
Length |
350 |
350 |
350 |
Current Range |
90-130 |
120-180 |
170-230 |
WELDING POSITIONS:
FLAT, FILLET, VERTICAL UP, HORIZONTAL, OVERHEAD
EXPORT Packing: 5Kg plastic container, then 4 5kg containers in master carton box
LOCAL Packing: 5Kg paper box in shrink wrapped plastic
Other special packaging can be accommodated as per request. |
