Hardfacing is applied in cases where the surface of engine parts is being subject to abrasion by wear, corrosion or heat. According to the definition hardfacing is applied when the surface is going to be damaged by wear due to hard minerals.
2. Trends for Welding
Filler wires can be regarded as an absolutely necessary welding process, with regard to a consumption per buyer of more than 1 ton of material per year.
But this processing can almost only be easily used in tub position. This means, that the engine parts to be protected have to be moved accordingly, so that welding in built-in condition is often impossible.
This procedure is also qualified for tungsten carbides, which are not added into the metal arc, but behind it, in order to have them gently inserted into the melt, without their dissolution, what is a second advantage. Thus a higher rate of tungsten carbides is achieved, which means a significantly better resistance to abrasive minerals compared to usual chromium carbides.
2.3 Submerged hardfacing
Submerged welding processes give us the chance of achieving fully mechanically even higher fusion efficiencies, compared to tubular-wire welding with open metal-arc, which often do achieve between 8 – 10 kg.
Hardfacing is a wage-intensive process, which is only to be applied, where operation costs in Western European countries, where wages costs are high, can really be decreased by applying this technology, or when operativeness cannot be guaranteed in another way.
3. Trends for Welding Fillers
3.2 Use of highly-chromium containing materials with higher carbon contents then those of filler wires
4. Trends for Applications
|Application for Vertical Roller Mills in Cement Plant|
Generally such strips do consist of materials which are known from the literature as being unweldable, having a high carbon-, chromium- or nickel-content.
4.2 Sinter-crusher stars with cobalt-base alloys and inserted mixed carbides
4.3 Use of hardfaced Plates as semifinished Products
|Wear Plate Producing|