Applications
Hard surfacing of cutter knives, shovel-teeth and casings.
Characteristics
VHF-700B deposits the weld metal of extremely hard martensite structure which contains dispersed precipitates of carbides and borides. It is applicable to such on abrasion that a weld metal of ordinary martensite structure can not withstand. Multi-layer hardsurfacing is not applicable due to less crack resistibility because the hardness of the weld metal is extremely high. Machining is impossible on the weld metal under as-welded condition.
INSTRUCTIONS FOR WELDING
1.) Preheat at 200ºC and over in general.
2.) It is desirable to apply postweld heat treatment at about 600ºC.
3.) Under-layer welding with low hydrogen type electrodes for mild steel is needed.
4.) Dry the electrodes at 300~350ºC for 30~60 minutes before use.
TYPICAL ANALYSIS OF ALL WELD DEPOSIT:
C |
Si |
Mn |
Cr |
Mo |
Others |
|
|
|
0.51 |
0.23 |
0.31 |
5.5 |
5.20 |
- |
|
|
|
HARDNESS: 57-61 HRC (640-720 Hv)
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. |
