Method 1: Manual welding. Welding air ducts are widely used, easy to operate, and are mainly adjusted by people. The filler material for the welding seam is welding rod. Hand welding can weld almost any material, even outdoors, so it has good adaptability, usually DC welding. The welding rod of the air duct manufacturer can be a titanium electrode or a silent one. Titanium electrodes are easy to weld, the welds are beautiful, and the slag is easy to remove. But the disadvantage is that if it is not used for a long time, it must be re-baked to prevent the accumulation of moisture. Method 2: metal electrode gas shielded welding. It belongs to gas shielded welding and arc welding. Under the shielding gas, the electrode is melted by the arc. Gas metal arc welding can be used for steel, non-alloy steel, low alloy steel, high alloy and other materials, and has a wide range of applications. But one thing is that its protective gas must be a reactive gas, such as carbon dioxide or mixed gas. The disadvantage is that if welding outdoors, the workpiece should not be damp, otherwise it will affect the gas protection effect. Method three: tungsten inert gas shielded welding. The arc is generated between the tungsten wire and the workpiece, so the shielding gas needs to be pure argon, and the wire is not charged, so it can be done manually or by machine, sometimes not. Then whether it uses DC or AC depends on the welding material. TIG welding is mainly used for welding thin and medium-thick workpieces, including alloy steel, aluminum, magnesium, copper, gray cast iron, nickel, silver, titanium, lead, etc. Shanghai Jiutian Automation Equipment Co., Ltd
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