The common methods for welding stainless steel spiral ducts are manual welding, metal inert gas shielded welding and tungsten inert gas shielded welding. Manual welding is very common and easy to operate. It is mainly adjusted by people, and the weld filling material is electric welding rods. Manual welding can weld almost all materials, even outdoors, so it has good adaptability. Generally, direct current is used for welding.

Electric welding rods can be either titanium welding rods or sealed welding rods. Titanium welding rods are easier to weld, the welds are beautiful, and the welding slag is easy to remove. But the disadvantage is that if it is used after a long period of non-use, it must be baked again to prevent moisture accumulation.

Metal inert gas shielded welding of stainless steel spiral ducts belongs to gas shielded welding, which is also an arc welding. Under the shielding gas, the welding rod is melted by the arc. Metal inert 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 shielding gas must be an active gas, such as carbon dioxide or a mixed gas. Its disadvantage is that if welding is done outdoors, the stainless steel spiral duct cannot be exposed to moisture, otherwise it will affect the protective effect of the shielding gas.