Tungsten Argon Arc Welding
1. Scope of application
Tungsten argon arc welding can weld almost all metals and alloys, but due to the high production cost, it is generally only used for welding stainless steel, heat-resistant steel and non-ferrous metals such as copper, titanium, aluminum and magnesium. For metals with low melting point (low boiling point) and easily evaporated, such as lead, tin, zinc, etc., it is difficult to weld.
2. Welding wire droplet transfer type
Mainly divided into three categories, free transition, short circuit transition, mixed transition.
3. Advantages
(1) Argon gas itself does not chemically react with metal and is insoluble in metal, and is 25% heavier than air, which can effectively block the air around the arc. Therefore, it is possible to successfully weld non-ferrous metals, stainless steels, and various alloys which are easily oxidized, nitrided, and chemically active.
(2) DC positive polarity arc is stable, stable combustion even under a small welding current (<10A), especially suitable for thin plate and ultra-thin plate welding.
(3) The arc has no slag, the weld pool has good visibility, is easy to control, and is easy to realize mechanization, automation and all-position welding.
(4) The arc heat source and the filler wire are separately controlled, and it is easy to realize double-sided forming of one-side welding, and since the filler wire does not pass the arc, no splash is generated, and the weld bead is beautifully formed.
4. Shortcomings
(1) poor wind resistance;
(2) High requirements for workpiece cleaning;
(3) Low productivity.
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