Welding magnets are indispensable materials in the arc welding process. Find out interesting things about welding rods.
For manual arc welding, melting electrodes and non-melting electrodes are used.
1.Que welding is straight metal wire cut into sections of 250mm-450mm length): these are called core welding rods. Covering a mixture of minerals on the core surface of the welding rod is called a coated rod, which is not called a ceiling rod. Welded welding rods with poor welding quality, so now people do not use.
Thanks to the rod that maintains the fire arc process, as well as the burning arc process, as well as the process of forming the weld.
The requirements for welding rods for arc welding are:
a. Welding need to ensure the mechanical properties of the weld
b. Ensure the required chemical composition for the weld.
c. Need to have good technology, ie:
- Easy to create reservoir and stable arc.
- Melts smoothly, does not clot to make it difficult for welding work.
- Able to weld in any space position.
- Received welds unknown, not cracking.
- The density of the liquid metal must be greater than that of the slag. It should be easy to separate the slag from the weld, not splash the metal and slag off the weld. d. Need to ensure high welding productivity, this capacity is characterized by the fill factor.
e. The demand for cheap fabrication.
g. No harm to workers when welding
The length of electrodes (250-450mm) depends on the diameter, metal composition and coating. If the rod diameter decreases, the length of the rod increases and the resistance of the rods increases. This will increase the heat of the solder while it is working, which facilitates the melting of the rods, but causes the splattering and the formation of bad welds. If the short rod length is wasted metal (due to excess solder not sold). Therefore, for a diameter, there must be a suitable length. The diameter of the welding rod depends on the thickness of the weld and the size of the weld (1-12mm), usually using the type of welding rod diameter (1-6mm), larger than 6mm, less use rod structure. solder coated. Here we rely on material welding rods can be divided into three main groups as follows:
Welding rod made of carbon steel. The core of this type of welding rod is CB.08, CB.08A, CB.10A, CB10 2 for the number of rods, only the carbon component; The letter A at the end indicates the plasticity and length and the high delay of the weld; while other words denote alloy elements.
These cores are used to manufacture coated electrodes such as E-42, E-50, E-46 ... or ONM-5YOHN 13/45 OMA-2 ...
Welding rod made of alloy steel, including 23 welding rods: CXB-10T, CMT.CB-13X2MT, CB-18XT, CA ...
Welding rod made of high-alloy steel, welding rod core of 28 brands are: CB10X1BMØH, CB-13X25T, CB-04K19H9, CB60X15H35B3 ... .. This type of welding rod is very high alloy.
2. Hot melt nozzles. Fabricated with tungsten, bar or graphite. During welding these electrodes do not melt but only wear out. Tungsten electrode (with a diameter of 1-5mm). Often 1.5-2% tori oxide is added to maintain the shape of the end of the electrode when welding. Coal electrodes and granite (diameters from 6-12mm long 250mm) at the end of it are usually lined with a 70o cone angle.