Cast iron electrode is actually a kind of electrode which is specially used to solve all kinds of fracture problems. This kind of electrode can solve the connection problem of the fracture in the machine base and casting tooth very effectively. The cast iron electrode on the market today is very versatile and complete. Each type of cast iron electrode has excellent performance. So, you know how to weld the cast iron electrode ? However, whether it is hot welding or cold welding is a very dangerous process, so how to weld the cast iron electrode is a topic of concern to related parties. Now we will give you concrete details about the welding methods and precautions for cast iron electrodes.
Cast iron electrode commonly used models
CMC-E46N
Welding directly on cast iron is very effective for metal wear of stamping dies. The first layer of weld metal is austenite; the wear resistance of martensite from the second layer is good. Flame-quenched cast iron can also be directly surfacing.
CMC-MS64N
Electrode for cast iron, high strength, good plasticity. Applicable to gray cast iron and ductile iron, can be machined.
CMC-E47N
Welding directly on cast iron is very effective for metal wear of stamping dies. The first layer of weld metal is austenite; the wear resistance of martensite from the second layer is good. Flame-quenched cast iron can also be directly surfacing.
CMC-E67N
It is especially suitable for the production of cast steel molds with hard surface to make bottom buffer layer, cracked welding, and welding reconstruction.
CMC-E65N
Cmc-e65n welding electrode, low expansion coefficient, slight hardening, especially suitable for cast iron. Cast steel (fc.fcd) steel mold hard surface make base buffer layer.
CMC-E61N
Suitable for all kinds of cast iron products, alloy cast iron, steel and cast iron joints, nickel and its alloys, etc., or welding such as water resistant castings.
WE777 special cast iron electrode
Suitable for all-round cold welding process welding. It can weld almost all cast iron base metals. It is easy to realize heterogeneous welding of cast iron and carbon steel. It can solve defects such as matrix fractures, cracks, wear and hole filling, and can be machined completely after welding. Many occasions are used in various types of cast iron parts such as engine housings, cylinder heads, machine bases, and cast gear teeth.
Cast iron electrode prices
In the current market, the production company of cast iron rods is also very large. Among them, the well-known brands of cast iron rods are also more diverse, and most of the foreign brands of cast iron rods are sold better, but their prices are often very high. Expensive. Due to different manufacturers, the price of cast iron electrodes ranges from 20 yuan to 200 yuan.
The use of cast iron electrode precautions
Due to the high carbon content, uneven microstructure, low strength, and poor plasticity, cast iron rods are poor in weldability. They are prone to cracks in the welding process. The post-weld cooling rate is extremely fast, and white-to-mouth microstructures are easily generated, making cutting difficult. . For the welding and repair welding of cast iron, in order to achieve satisfactory results, attention must be paid to the “three-point material and seven-point processâ€. It is important not only to select the welding rod but also to adopt a suitable welding method. The following welding procedures are recommended as reference for cast iron welding and repair welding:
1, first remove the mud, sand, water, rust and other dirt at the welding site; for iron castings that have been working under high temperature and steam conditions for a long time, remove the surface carbon-depleted layer and oxide layer.
2. According to the shape and type of defects in the welded parts, preparation measures such as opening, opening, cracking and molten pool modeling are carried out.
3, for the need for cold welding of the workpiece, first preheat 500-600 °C or so, select the appropriate current, continuous welding, welding process always maintain the preheating temperature, immediately after welding asbestos powder and other insulation materials, let it cool down To improve its crack resistance and processability.
4. For cold welding workpieces, prevent the parent metal from melting too much, reduce the tendency of white mouth, prevent excessive heat concentration, cause excessive stress, and should try to use small current, short arc, narrow pass welding (the length of each pass is generally not More than 50mm). Immediately after welding, the weld is hammered to relax the stress to prevent cracking. After the temperature drops below 60°C, weld it again.
5, pay attention to arc filled when arcing, in order to prevent cracking arc.
How to weld the cast iron electrode
A. Heat welding method of cast iron electrode
The so-called heat welding method is to heat and weld the cast iron electrode. First, before welding, we must heat all the objects to 600 to 700 degrees. In the welding process, the temperature of the entire welded part must not be lower than 400. degree. But after welding, we can wait for it to cool. The method of heat welding is generally gas welding and electric welding, and the tools required are hot stoves and welding tools. The process is generally: First, the preheating is performed, the entire welded part is cleaned until the metal is exposed, and then it is put into the furnace for heating. After welding, it is usually possible to use neutral flame welding. When the metal melts, put the welding rod in. Then wait until the white point appears. Put the welding agent in it. It must be in proper quantity, and then weld it. However, care must be taken to smooth the weld during the welding process. Finally, it is enough to cool it. Pay attention to cover the board during the cooling process to avoid cracks.
II. Cold welding method of cast iron electrode
The cold welding method is generally welded. The first step of cold welding and hot welding is the same. First, it is cleaned until the metal is exposed, and then the welding is started. During the welding process, both the welding electrode and the current should be as small as possible to avoid wasting the welding rod and welding. It is best to maintain current stability during the process. Do not affect welding due to temperature. When welding, it is best to follow the principle of first inside and outside, spread the welding, welding the first layer in the welding of the second layer, it is best to check at the time of welding whether there is no air hole or crack left. This careful welding is just fine.
Three. Welding precautions
First of all, we need to clean up the debris above all during the welding process. For the hot-welding electrodes, we must also remove the oxides above. The second is to note that when welding cracks, attention should be paid to observing the shape of the cracks and so on. Choosing a good electrode, one more point is that if everyone chooses cold welding, they must also warm up before choosing the right current. Keep the current stable.
Editor's summary: For materials such as cast iron rods, it still needs to pay attention to many aspects in the process of use, but also to make appropriate preparations for the welded parts, otherwise it will be easy to fail in welding. This electrode is very much in production on the market.
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