First, the principle of electrode arc welding
The principle of electrode arc welding is to use the arc heat generated between the electrode and the weldment to locally heat the electrode and the weldment to the point of melting In this state, the molten droplet at the end of the electrode and the molten base metal fuse together to form a molten pool. As the arc moves forward, the liquid metal in the molten pool gradually cools and crystallizes, forming a weld. The formation process of electrode arc welding seam is shown in Figure 2-1.
Second, the characteristics of electrode arc welding
(1) The welding line energy is small, and the weld metal The grains are finer, and the mechanical properties of the welded joint are good.
(2) Easy operation and strong adaptability, suitable for welding of different steel grades, various positions and various structures.
(3) Simple equipment and small investment.
(4) The production efficiency is low.
(5) Welders are labor-intensive.
(6) Welder skills determine welding quality.
Three, the difference between arc welding and argon arc welding
Arc welding includes, Manual arc welding, submerged arc welding, etc. It is based on the arc burning between the electrode and the workpiece as the heat source, and different filler metals can be used. TIG welding: The arc between the tungsten electrode and the workpiece is used to melt the metal into a weld. The tungsten electrode does not melt during welding, it is only used as an electrode.
Targon arc welding TIG welding is arc welding that uses argon as the shielding gas. During argon arc welding, after the argon gas is ejected from the nozzle, a closed and continuous gas protective layer is formed, which isolates the arc and the molten pool from the atmosphere, avoids the intrusion of harmful gases, and plays a protective role. According to the different electrodes used, argon arc welding is divided into melting electrode argon arc welding and non-melting electrode (or tungsten electrode) argon arc welding.
Targon arc welding is mainly used for welding easily oxidized non-ferrous metals (such as aluminum, magnesium, copper, titanium and alloys) and rare metals, as well as high-strength alloy steel, stainless steel, heat-resistant steel, etc.
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