What is SAW (Submerged arc welding)?
Submerged arc welding (SAW) is a method in which submerged arc wire is used as electrode and the arc is burned in granular, fusible flux. Because of the molten pool good protection, good working conditions, high automation level, high deposition efficiency, easy adjustment of weld alloy system can adopt large welding specification, have special request for welding position, length of this welding method is commonly used in a certain position of welding, such as pressure containers, heavy machinery, large diameter pipe of oil and gas, transport machinery, ships, etc. The longitudinal girth, long straight seam, big thickness of welding groove, etc
What is SAW EM12k welding wire?
SAW EM12k welding wire is the copper carbon structural steel wire, with the corresponding flux for automatic arc welding; welding metal has excellent mechanical properties.
Application: Suitable for automatic welding of boilers, pressure vessels and submerged arc welding of carbon steel and alloys with lower strength grade, such as 16Mn.
What are the advantages of submerged arc welding EM12k welding wire?
1. High productivity: when submerged arc welding wire coming out of the conductive nozzle length is shorter, can use a larger current, the corresponding current density is bigger also, plus flux and heat insulation effect of the molten slag, high thermal efficiency, the penetration is larger, the medium thickness plate open I can weld penetration groove, or welding groove size can be smaller, reducing the amount of filler metal, therefore, the submerged arc welding welding speed can quickly, high productivity.
2. Good weld quality: slag protection is adopted during submerged arc welding, which can not only isolate the outside air, but also slow down the cooling speed of molten pool metal, so that liquid metal has more time to conduct metallurgical reaction with molten flux, reducing the possibility of pores, cracks and other defects. The flux can also metallurgical reaction and transfer some alloying elements with the weld, thus improving the quality of the weld. Meanwhile, the application of automatic adjustment and control technology in submerged arc welding makes the welding process very stable and the weld appearance and quality beautiful.
3. Save welding materials and electric energy: Submerged arc welding can open i-shaped groove or small-angle groove due to a large heat input, which reduces the amount of filler metal. In addition, it is protected by flux and slag to reduce metal splash loss and heat loss, thus saving welding materials and electric energy.
4. Good working conditions: Submerged arc welding is a mechanized operation, so the labor intensity is low. In addition, the arc burns under the flux layer, less harmful gas escapes, and there is no arc radiation, which does less damage to the welder's body.
What are the disadvantages of submerged arc welding?
1. As the arc of submerged arc welding is covered by flux, it is not easy to observe in the welding process, so it is not conducive to timely adjustment.
Because submerged arc welding relies on the accumulation of granular flux to form protective conditions, it is mainly suitable for flat welding position, and special measures should be taken for welding in other positions.
2. As the main components of submerged arc welding flux are MnO, SiO2 and other metals and non-metallic oxides, it is difficult to weld aluminum, titanium and other metals with strong oxidation properties and their alloys.
3. Because of poor mobility and complex welding equipment, it is not suitable for the welding of short welds, and it is difficult to weld some irregular welds.
4.Submerged arc welding has poor arc stability when the welding current is less than 100A, so it is not suitable for thin plates with welding thickness less than 1mm.