The commonly used methods for welding stainless steel spiral ducts include manual welding, metal electrode gas shielded welding, and tungsten inert gas shielded welding. Manual welding is very common and easy to operate, mainly relying on human adjustment. The filler material for the weld seam is welding electrode. Manual welding can weld almost all materials, even outdoors, so it has good adaptability. Generally, direct current is used for welding.
Welding electrodes can be either titanium type or inert. Titanium type welding rods are relatively easy to weld, with beautiful welds and easy removal of welding slag. But the disadvantage is that if it is not used for a long time before use, it must be baked again to prevent moisture accumulation.
The metal electrode gas shielded welding of stainless steel spiral ducts belongs to gas shielded welding, which is also a type of arc welding. It is a process where the welding rod is melted by the arc under shielding gas. Metal electrode gas shielded welding can be used for materials such as steel, non alloy steel, low alloy steel, and high alloy, and is widely used.
But one thing is that its protective gas must be an active gas, such as carbon dioxide or a mixture of gases. Its disadvantage is that if welding is carried out outdoors, the stainless steel spiral air duct cannot be dampened, otherwise it will affect the protective effect of the protective gas.
The tungsten inert gas shielded welding arc is generated between the tungsten electrode welding wire and the workpiece, so it is required that the shielding gas be pure argon gas, and the welding wire is not charged, so it can be manually fed, machine fed, or sometimes not fed. Whether it uses direct current or alternating current depends on the welding material.
Tungsten inert gas welding is mainly used for welding thin and medium thickness workpieces, with a wide range of materials including alloy steel, aluminum, magnesium, copper, gray cast iron, nickel, silver, titanium, and lead.