Manual arc welding, repair welding cast iron piece with the Welding Rod. According to weld 928 points, there are mainly five types of electrode:
(1) pure nickel class Cast Iron Electrode. Electrode made ??of pure nickel weld core and graphite-type coating, weld nickel-containing more than 90%, mainly for difficult welding Welding malleable cast iron and alloy cast iron.
(2) nickel-iron type Cast Iron Electrode: the electrode made ??by the core of nickel-iron welding and graphite type coating, containing nickel in the weld in about 50% of soil to be used for repair welding of ductile iron.
(3) of nickel and copper in class cast iron electrode. Nickel-containing welding nickel-copper alloy (monel) core and the electrode made ??of graphite-type drug skin, the weld 60% to 70%, copper 25% and 35% for repair welding of gray cast iron.
(4) cast iron cast iron electrode. Cast iron welding core electrode made ??of carbon steel welded core and graphite type coating, weld composition of cast iron composition is close to gray cast iron and nodular cast iron welding repair welding should preheat to 400 ~ 500 ℃ , slow cooling after welding insulation.
(5) carbon steel cast iron electrode.
There are two of its weld composition. One is close to the low-carbon steel, the other is the weld composition containing vanadium in about ll%. The former welding repair can not be cutting; the latter Welding, cutting, its crack resistance than the former. Can weld up the general iron castings and ductile iron casting
Drug skin contains large amounts of acidic oxide Welding Rods. Acid Welding Rods coating, including five types: high-type titanium dioxide, titanium dioxide calcium-type, ilmenite, iron oxide and cellulose. The content of multi-drug skin acidic oxides (such as SiO2, TiO2, etc.), electrode welding process performance, such as stable arc, easy slag detachability, beautiful appearance, splash rarely suitable for AC, DC two power supplies. Such Welding Rods are often used for capping and other decorative parts of the welding. The shortcomings of the acid electrode weld diffusible hydrogen content is high, the crack resistance is poor, not suitable for the welding of rigid parts and thick structure. In addition, because of its lower weld toughness, not suitable for welding to withstand dynamic load or low temperatures the structure. With the improvement of alkaline oxides in the drug skin weld toughness has been improved weld toughness of titanium dioxide calcium electrode and the ilmenite-type electrode is higher than the high titania type electrode can be used for more important parts of the welding. Higher weld toughness of cellulose type electrode welding of pipeline steel of various strength levels, particularly suitable for the underlying downward vertical welding and pipe welding.