FusoFlex

Ultimate-18(SPECIAL):

ULTIMATE-18 (SPECIAL) is an outstanding electrode designed for several stringent applications demanding the best in terms of total weld quality. This unique electrode is capable of yielding welds which are of radiographic quality, combined with exceptionally high impact strength and crack resistance. Thus it is suitable for a very wide range of grain-refined steels having tensile strength in the range of 500 to 600 N/mm², as well as difficult steels containing higher carbon or higher levels of sulphur and other impurities.

Ease of operation in all positions.
Smooth and stable arc which is easy to strike & restrike, combined with low spatter and with due control on molten pool.
Slag detachability with little effort.
Finely rippled bead with regular profile.
Welds of consistent X-ray quality.
Weld metal which possesses excellent mechanical properties and displays resistance to cracking caused by heavy stresses and /or hydrogen. In particular, it displays remarkable impact resistance at subzero temperatures down to minus 50°C.

Identification:Name Printed

Applications

Boilers
Horton spheres
Pumps and Compressors
Penstocks
Off-shore drilling rigs & Platforms
Pressure vessels
Frigates & Submarines
Blast furnace shells
Rotary kiln shells
Machinery for earth moving & road building
Bridges
Rail wagons & coaches

Chemical analysis of all weld deposits(%):

Carbon	Manganese	Silicon	Sulphur	Phosphorus
0.08	1.10-1.60	0.50	0.008	0.015

All weld mechanical properties:

Ultimate Tensile Strength kg/mm²	Yield Strength kg/mm²	Elongation (L=4d)%	CVN Impact Value Joules at -50°C
53-62	46-52	25-32	60-120

Welding current ranges and packing data for sizes manufactured:

Dia (mm)	2.5	3.15	4.0	5.0	6.3
Length(mm)	350	450	450	450	450
Current(Amp)(DC+ or AC 70V)	80-100	100-140	140-190	190-250	270-320
Pieces per carton	125	90	60	40	25

Notes on usage:

Redry the electrodes at 300-350°C for one hour, cool them to 100°C, and transfer them to a holding oven maintained at 50°-60°C.
Minimise heat input, and control interpass temperatures below 150°C to obtain optimum impact values. Clean the weld area free of any surface contaminations.