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cobalt net
by on December 10, 2018
Cobalt Chrome Alloy electrodes can be divided into two categories: acid cobalt alloy electrode and alkaline cobalt alloy electrode according to the nature of the electrode coating. An electrode containing a large amount of acidic oxide (TiO2, SiO2, etc.) in the coating is called an acid electrode. A coating containing a large amount of basic oxides (CaO, Na2O, etc.) in the coating is called a basic electrode.

Acidic cobalt alloy electrode can be used for both AC and DC, and the welding process performance is better, but the mechanical properties of the weld, especially the impact toughness, are suitable for the welding of low-carbon steel and low-strength low-alloy structural steel. Apply a wider range of electrodes. The alkaline Cobalt Alloy Blade electrode has strong desulfurization and dephosphorization ability, and the coating has dehydrogenation effect. The welded joint has a very low hydrogen content, so it is also called a low hydrogen type electrode. The weld of alkaline cobalt alloy electrode has good crack resistance and mechanical properties, but the process performance is poor. It is generally applied by DC power supply and is mainly used for welding important structures (such as boilers, pressure vessels and alloy structural steels).

The height of the underlying soldering layer is not more than 4mm. When filling the welding, the welding gun is oscillated laterally, so that the surface of the bead is concave and the height is lower than the surface of the base metal by 1.5mm - 2mm: when the surface is welded, the edge of the welding pool should exceed The edge of the groove is 0.5-1.5mm to prevent undercut. Fire and arc ignition should not be carried out on the base metal other than the weld. The welding material used for tack welding should be equivalent to the formal welding. The tack weld should have the same quality requirements as the weld.

The positioning sytop Cobalt Alloy welding of the steel liner should be welded in the groove of the joint. The thickness of the tack weld should not exceed 2/3 of the thickness of the designed weld. The length of the tack weld should not exceed 40mm, fill the crater, and the preheating is higher than the formal weld preheating. temperature. When there are air holes and cracks in the tack weld, the re-weld must be removed.

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