1) Hand arc welding (STICK)
Shielded Arc Welding (abbreviated SMAW) in English,
The principle is: the arc occurs between the coating electrode and the base metal, and the welding method of arc thermal ablation electrode and base metal is used. The outer layer of the welding rod is covered with flux, which is ablated when heated, and has the functions of making the arc stable, forming slag dissolving, deoxidation, and essence.
The welding power supply uses a communication welding machine or a DC arc welding machine with descending characteristics. Generally, a communication arc welding machine is used, and a DC arc welding machine is used when arc stability is particularly required.
Key features:
1: The welding operation is brief
2: The welding tong is light and easy to move,
3: Applicable to a wide range of operations
2) Melting Extreme Gas Shielded Welding (CO2/MAG/MIG)
Gas metal arc welding (abbreviated GMAW)
MAG Welding: metal Active Gas Welding
MIG Welding: metal Inert Gas Welding, (Inert Gas: Inert Gas)
According to the type of maintenance gas, it is roughly divided into MAG welding and MIG welding. MAG welding uses CO2, or argon mixed with C02 or oxygen (these are called reactive gases). Welding habits that use only CO2 gas are called CO2 arc welding, which is different from MAG welding. MIG welding uses inert gases such as argon and helium.
The principle is that an arc occurs between the thin-diameter electrode (welding wire) and the base metal, and the base metal is sealed with maintenance gas to melt the base metal and the wire. It is widely used in semi-active welding with hand-held welding torches by operators, as well as robot welding and active welding.
Features of CO2 welding:
1: The welding speed is fast
2: High arc striking efficiency
3: The melt pool is deep
4: High deposition efficiency
5: One welding wire can be applied to a variety of plate thicknesses
6: Good welding quality
7: Small deformation after welding
8: One welding wire can be applied to a variety of base metals
Features of MAG welding:
1: In addition to the advantages of CO2 welding
2: The appearance of the weld is beautiful
3: Less splashing
4: Double-sided forming welding, all-round welding is simplified
5: Suitable for high-speed welding
Features of Pulse MIG (GMAW) Welding:
The MIG method is mostly used for aluminum welding, and generally adopts pulse control.
Pulsed MIG welding allows for minimal spatter with jet transitions. The weld has a beautiful appearance and can obtain a flat weld stack shape. Compared to pulse-free MAG/MIG welding, the jet transition can be completed with thicker wires, so the wire feeding function can be improved and the wire cost can be reduced in thin plate welding. In particular, aluminum and alloy welding has advantages in automation and robotization.
The principle of pulsed MIG (GMAW) welding: the welding current is periodically repeated in the form of pulse current Ip and base current Ib, and the molten droplet transition can be completed in a wide range of welding currents.
3) Tungsten argon arc welding (TIG)
Tungsten Inert Gas (TIG), also known as Gas Tungsten Arc Welding (GTAW)
The principle is: TIG welding is a method of melting and welding the base metal by making an arc between the tungsten electrode and the base metal in an inert gas environment such as argon.
DC TIG welding
The DC arc welding power supply is used as the welding power source, and the electrode is negative and the base metal is positive, which is widely used in the welding of stainless steel, titanium, copper and copper alloy.
Communicate TIG welding
The AC arc welding power supply is used as the welding power source, and the positive and negative polarities of the electrode and base metal change from each other. When the electrode is positive (EP polarity), the electrode overheating consumes a lot and removes the oxide layer on the surface of the base metal, which is the so-called cleaning effect. With this cleaning effect, it is widely used in welding of aluminum and magnesium.
Features of TIG (GTAW) welding:
1: It can weld almost all industrial metals and alloys
2: Good welding quality and high reliability
3: The welding is well formed, and the slag does not need to be removed
4: No splash
5: Less smoke and dust
6: It can be applied to a wide range of plates - thick plates
4) RESISTANCE
Resistance welding, like arc welding, is widely used in metal welding, and has become an indispensable welding method in cars, home appliances, electronic equipment, railways, construction, civil engineering and other industries.
Its principle is: a welding method that melts and joins the base metal by gathering a large current and applying pressure, and using the resistive heat at the joint of the welded material. The basic principle of resistance welding is to use resistance heating to melt metal, pressurize and bond, including resistance spot welding, projection welding, seam welding, rolling welding, etc.
Features of resistance welding
1: The two-piece lap spot welding has high efficiency
2: The welding speed is fast, suitable for mass production
3: Beginners can also solder briefly
4: Small welding deformation
5: No need for welding wire, chemicals, and no consumables
6: Low production cost
5) PLASMA
The principle of plasma cutting is: arc discharge between the base metal (including the nozzle in the cutting torch) and the electric in the cutting torch, and use the discharge heat energy to make the compressed gas generate a high-temperature and high-speed plasma arc, and fuse the cutting method of the base metal. The small hole of the nozzle makes the plasma flow finer and denser.
Features of air plasma incision:
1: Can be used to cut through all metal briefly
2: The blocking speed is fast
3: The incision deformation is less, and the incision can be completed without fixing the fixture
4: The cut shape is not constrained
5: The heat-affected part is small
6: Touch and non-touch interception are acceptable
7: No need to be proficient, simple operation
8: The equipment machine is relatively cheap
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