COATING TYPE — Basic
|ГОСТ 9466 — 75 ЦЧ-4
||ТУ У 28.7-34142621-006:2012
Electrodes TsCh-4 possess good welding-technological properties: easy primary and secondary ignition and stable arc burning, low spatter loss, good weld metal formation in flat position welding. A strong carbide former, vanadium, is added to the weld metal, produced by electrodes TsCh-4. The formed carbides of this element are not dissolved in iron and have a shape of fine-dispersed non-hard inclusions. Metallic base, in this case, occurred to be decarburized and quite plastic. It is possible to apply treatment by a cutting tool after welding. Into the metal, welded with CCH-4, a strong carbide-forming agent vanadium is inoculated. The resulting carbides of this element do not dissolve in the iron and are in the form of finely dispersed non-solid inclusions. The metal base is then decarburized and sufficiently ductile. After welding, processing with a cutting tool is possible.
PURPOSE AND FIELD OF APPLICATION
Metal electrodes with a basic coating TsCh 4 for manual arc welding and surfacing of cast iron are designed for cold welding of structures of high-strength cast iron with spheroidal graphite and grey cast iron with a flaked graphite, as well as their bond with steel. Electrodes TsCh-4 can be used for welding of damaged parts and patchworks of high-strength cast iron and gray iron and preliminary surfacing of the first one-two layers on worn-out cast iron parts for next surfacing by special electrodes.
CONDITIONS OF APPLICATION
Deposition rate factor: 10.0 g/А h. Consumption of electrodes per 1 kg of deposited metal is 1.8 kg. The welding process should be made only on clean, not greased and rusted surfaces (the place of joining should be grinded before welding). Welding should be made by short beads of 25-35 mm length with self-cooling of each bead 60°С and peening each weld area by slight impacts of hammer. In welding of malleable and high-strength cast iron, the bead length can be increased to 80-100 mm.
At high open-circuit voltage (more than 50 V) of transformer and short length of welding cables the AC welding is possible.
REDRYING BEFORE WELDING
At the normal storage conditions, the redrying before welding is not required. In case of moisture redrying is made: 160-200°С 60 min.
CHEMICAL COMPOSITION OF WELD METAL, %
Welding should be made at DC of reverse polarity, “+” at electrode.
||Welding current, A
||Units per package, pcs
||Weight of packing, kg
ДСТУ EN ISO 6947