Selecting Cast Iron Stick Electrodes usually comes down to 3 things: price, machine-ability, and if the weld is solitary or multiple pass.
A professional supplier of China Cast Iron Stick Electrodes will tell you that Tech Rod 99 (AWS ENi CI level) is a nominally 99% nickel electrode. Nickel is expensive, so this is a high-quality electrode. Welding electrodes will deposit processable welds, which is an important consideration when machining castings after welding. The repair with the technical rod 99 is usually a single pass welding of high admixture. Even if a high admixture is used, the deposited layer can still be processed. It is most suitable for castings with low or medium phosphorus content.
The technical rod 55 (AWS ENiFe CI grade) is a nominal 55% nickel electrode. The lower nickel content makes the electrode more economical than the technical rod 99. Weld deposits are usually processable, but under high admixture conditions, the weld may become hard and difficult to process. It is usually used to repair thick castings or thick castings. Compared with TechRod99, the weld made of 55 nickel has higher strength, toughness and resistance to phosphorus. Its expansion coefficient is also lower than 99Ni, resulting in fewer weld line cracks.
Iron welding (AWS course ESt) is a low-cost steel electrode. The welding deposit is very hard and cannot be processed, but can be completed by grinding. This is the cheapest electrode for welding cast iron, and the electrode has a good user-friendly arc. It can withstand welding on castings that cannot be completely cleaned before welding. Iron welding slag will rust, just like cast iron. This can be very important when installing cast iron components (such as exhaust manifolds) on traditional cars.
.jpg)
Next, the China Cast Iron Electrode Suppliers introduce you to one of the suitable welding techniques for cast iron alloys, bar welding.
Bar welding, also known as shielded metal arc welding or MMA, uses consumable electrodes covered with flux. Depending on the application, the required color matching, and the amount of processing to be performed after welding, different types of electrodes can be used.
Three main types of fillers are very suitable for cast iron rod welding:
Cast iron electrode
Copper alloy electrode
Nickel alloy electrode
Nickel alloy electrode is the most popular electrode in cast iron welding. Nickel-iron welding is stronger and the coefficient of thermal expansion is lower, which can reduce welding stress and improve crack resistance.
The arc between the electrode and the welding area will melt the metal and cause melting. The arc should be aimed at the weld, not the base metal, because this will minimize dilution. It is recommended to use the lowest current setting approved by the manufacturer to minimize thermal stress. Before welding with cast iron or copper electrodes, preheat parts to at least 250°F. Nickel electrodes can be used without preheating.
