FusoFlex

Unimate-22:

Hydrogen controlled, basic coated iron powder type electrode, Specially designed for welding of fine grained steels and nickel alloy steels. Presence of 3.5% Ni imparts to weld metal a high degree of low temperature notch toughness and resistance to the embritting effects of sub-zero temperatures. The electrode is thus well suited for welding pressure vessels, piping systems, valves and tanks used for liquified propane, butane, ethane and Co2 etc..

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.
Welds of consistent X-ray quality.
Weld metal which possesses excellent mechanical properties and displays remarkable impact resistance at sub-zero temperatures down to minus 80°C.
A higher level of metal recovery at 100-110%.
Resistance to moisture pick-up.

Identification:Name Printed

Chemical analysis of all weld deposits(%):

Carbon	Manganese	Silicon	Sulphur	Phosphorus	Nickel
0.10	0.80-1.25	0.60	0.025	0.030	3.0-3.75

All weld mechanical properties:

Ultimate Tensile Strength kg/mm²	Yield Strength kg/mm²	Elongation (L=4d)%	CVN Impact Value Joules at -73°C
57-66	48-56	20-28	40-80

Welding current ranges and packing data for sizes manufactured:

Dia (mm)	2.5	3.15	4.0	5.0
Length(mm)	350	450	450	450
Current(Amp)(DC+ or AC 90V)	80-100	100-140	140-180	190-250
Pieces per carton	125	90	60	40

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.
Minimise heat input and control interpass temperature below 150°C to obtain optimum impact values.
Clean the weld area free of any surface contaminations.
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 temperature below minus -80°C.