FusoFlex

Unimate-2:

Hydrogen controlled, basic-coated iron powder type electrode. Presence of 3.5% Ni imparts to weld metal a high degree of low temperature notch toughness. The electrode is thus well suited for welding fine grained steels, HSLA steels, used in penstocks, pressure vessels, piping, valves & tanks; in particular, 3.5% Ni steel used for LNG tankers, LNG storage tanks, ethylene production equipment to be used at about minus 100°C, and tankers for transportation of liquified ethylene.

Ease of operation in all positions, except vertical top to bottom.
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 adequate impact resistance at subzero temperatures down to minus 101°C.
A higher level of metal recovery at 100-110%.
Extra-low level of diffusible hydrogen.
UNIMATE-2 has been designed to meet the requirements of E 7018-C2L in terms of weld metal chemistry & mechanical properties, with emphasis on impact strength at minus 101°C after stress-relieving. Hence its suitability for welding of base materials of ASTM A 203, Grades A, B, D, E. DIN 10Ni14, 12Ni14, 16Ni14.

Identification:Name Printed

Application:

Chemical analysis of all weld deposits(%):

Carbon	Manganese	Silicon	Nickel/th>	Sulphur	Phosphorus
0.05	0.60-1.25	0.50	3.0-3.75	0.025	0.025

All weld mechanical properties:

Ultimate Tensile Strength kg/mm²	Yield Strength kg/mm²	Elongation (L=4d)%	CVN Impact Value Joules at +20°C	CVN Impact Value Joules at -60°C	CVN Impact Value Joules at -80°C	CVN Impact Value Joules at -101°C
50-65	48-56	25-32	>130	>65	>45	>30

Welding current ranges and packing data for sizes manufactured:

Dia (mm)	2.5	3.15	4.0
Length(mm)	350	350	350
Current(Amp)(DC+ or AC 90V)	80-100	100-140	140-180
Pieces per carton	125	90	60

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°C- 60°C.
Use short arc to the extent practicable.
Minimise heat input, and control interpass temperature below 100°C to obtain optimum impact values.
Minimise weaving to control heat input, and to optimise the number of layers to bring about grain refinement for improving notch toughness, especially at service temperatures below minus 80°C.
Clean the weld area free of any surface contaminations.