(1) The advantages of electrode arc welding are that the equipment is simple, lightweight and flexible to operate. It can be suitable for welding short seams in maintenance and assembly, especially for welding in hard-to-reach parts.
(2) Submerged arc welding can use a larger current. Under the action of arc heat, part of the flux melts into slag and undergoes a liquid metallurgical reaction with the liquid metal. Another part of the slag floats on the surface of the metal pool. On the one hand, it can protect the weld metal, prevent air pollution, and produce physical and chemical reactions with the molten metal, improving the composition and performance of the weld metal; on the other hand, it can also make the weld The seamed metal cools slowly to prevent defects such as cracks and pores.
(3) Gas tungsten arc welding can control heat input very well, so it is a good method for connecting thin sheet metal and primer welding.
(4) Gases commonly used in gas metal arc welding include argon, helium, carbon dioxide or mixtures of these gases.
(5) Flux cored arc welding can be considered a type of gas metal arc welding. The welding wire used is flux-cored welding wire, and the core of the welding wire is filled with powders of various compositions. During welding, a protective gas is added, mainly CO2 gas, and the powder is decomposed or melted by heat, which plays the role of generating gas and slag to protect the molten pool, infiltrating the alloy, and stabilizing the arc.
(6) Downward welding is a process introduced from abroad that is suitable for pipeline circumferential seam welding. Downward welding has the advantages of high production efficiency and good welding quality.
