Development electrodes ferrotitanium for cold welding of cast iron

Abstract

The aim is to improve the quality of the weld metal during arc welding of cast iron.
Designed electrodes for cold welding cast on wire Sv-08A with a carbide coating containing
a new doping system Ti-Si-Al, the coating comprising marble, ferrotitanium, aluminum, mica, soda,
titanium dioxide, talc, carboxymethylcellulose, ferrosilicon and fluorspar.
For studies used metal electrodes for manual arc welding, crimping method made. Electrode
rods were made of steel wire grade Sv-08A GOST 2246-70 in diameter and 3 to 4 mm.
To determine the quality of the deposited metal and welded-technological properties of
multilayer welding electrodes made cutting depth of 20 mm and a length of 100 mm with an
opening angle of 70° on the plate made of cast iron brand СЧ 21 to 30 mm thick. Welding is carried
out to 4 mm diameter electrodes at a constant current of opposite polarity. Current 140-160 A.
Hardness of weld metal varies in height from HB 217 in the upper layers to HB 269-277 –
near the fusion zone. In termovliyaniya zone marked increase in hardness up to 269-352 HB. The
depth of the zone of cementite-ledeburite equal to 0.5 mm.