Application field
VHF-HSS690 is used for manufacturing and reconditioning tools and in general for surfacing with high wear resistance on machines and tools. The weld metal withstands stressing by abrasions, impact compression and temperatures up to 1020ºF (550ºC).
This electrode is suitable for the production of all kinds of cutting tools, such as lathe and plane tools, large drills, countersinks, millers, broaches and for hot work tools like deburring plates, punches, hot shear blades etc.
Under the designation VHF-HSS690 we supply a special synthetic electrode.
Welding properties of the weld metal
The electrode can be welded in all positions except vertical down. Good slag removal. The weld metal of VHF-HSS690 corresponds to a super-speed steel with high molybdenum content.
Pure weld metal hardness
Hardness after welding : 61-63 HRC (720-780 Hv)
Soft-annealed : about 25 HRC
Hardened : 64-66 HRC
Heat treatment
Soft annealing :1470-1525ºF (800-830ºC) 2 hours
Hardening : 2120-2260ºF (1160-1240ºC) / cooling in oil
Tempering : once or twice at 1000-1040ºF (540-560ºC) / 30 mins each
Welding instructions
Bigger workpieces must be preheated to 750-1110ºF (400-600ºC) and kept at this temperature during welding.
A lower preheat temperature is enough for smaller work, because it is heated adequately by the arc. Certain jobs on smaller workpieces may even be welded without preheating. The depth of the build-up may amount to 15mm max.
Slowly cool in an oven or under asbestos after welding. The weld can be machined only by grinding after it cools. If other cutting operations have to be performed on a build-up weld, annealing is necessary.
TYPICAL ANALYSIS OF ALL WELD DEPOSIT:
C |
Si |
Mn |
Cr |
Mo |
W |
V |
|
|
0.9 |
0.81 |
0.52 |
4.6 |
8.1 |
2.0 |
1.2 |
|
|
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
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. |
