Introduction of TIG welding machine and MIG welding machine
Nowadays, electronic welding machines are widely used in the mechanical industry. Depending on the purpose of use, different welding methods are used for their work.
We would like to introduce you the advantages of MIG welding machine and TIG welding machine
MIG welding machine:
Gas metal arc welding (GMAW or MIG welding) is an electric arc welding procedure that uses a spool of continuously fed wire. It is likely used to join long stretches of metal without stopping. The weldor, or apparatus, holds the wire feeder and a wire electrode is fed into a weld at a controlled rate of speed, while a blanket of inert argon gas shields the weld zone from atmospheric contamination. Shielding the arc and molten weld pool is done by "externally" supplying gas or a gas mixture.
MIG welding can be used on all thicknesses of steels, on aluminum, nickel, and even on stainless steel, etc. However, it is most typically utilized in manufacturing and in commercial fabrication settings.
Advantages of MIG welding machine:
High quality welds can be produced much faster
Since a flux is not used, there is no chance for the entrapment of slag in the weld metal resulting in high quality welds
The gas shield protects the arc so that there is very little loss of alloying elements. Only minor weld spatter is produced
MIG welding is versatile and can be used with a wide variety of metals and alloys
The MIG process can be operated several ways, including semi and fully automatic
The MIG welding cannot be used in the vertical or overhead welding positions because of the high heat input and the fluidity of the weld puddle
The equipment is complex.
MIG equipment consists of a welding gun, a power supply, a shielding gas supply, and a wire-drive system which pulls the wire electrode from a spool and pushes it through a welding gun. A source of cooling water may be required for the water cooled welding gun. There are also Mig rod ovens for proper storage of electrodes.
The majority of MIG welding applications require direct current, reverse polarity. This type of electrical connection yields a stable arc, helps to smooth the metal transfer, has relatively low spatter loss, and gives good weld bead characteristics. Direct current straight polarity (electrode negative) is seldom used, since the arc can become unstable and erratic even though the electrode-melting rate is higher.
Alternating current has found no commercial acceptance with MIG welding because the arc is extinguished during each half cycle as the current reduces to zero and it may not re-ignite if the cathode cools sufficiently.
MIG guns are available for manual manipulation, semiautomatic welding, and for machine or automatic welding. Because the electrode is fed continuously, a welding gun must have a sliding electrical contact to transmit the welding current to the electrode. The gun must also have a gas passage and a nozzle to direct the shielding gas around the arc and the molten weld pool. An electrical switch is used to start and stop the welding current, electrode feed, and the shielding gas flow.
TIG welding machine
The TIG process used to join a wide range of metal, which are likely aluminium, magnesium, copper, nickel, titanium, etc. and their alloys. TIG can be used to weld in any position flat, horizontal, vertical, overhead position. It used where quality is critical. Eg. Pipes, vessels, aerospace industry.
Advantage of TIG welding machine :
- CO2 is accesible to make and produce at low cost
- CO2 welding capacity is 2.5 times higher than arc welding
- The technology of welding in CO2 is higher than that of welding under the flux coating as it can be carried out in different areas
- Good welding quality
- Welding products are less warped due to high welding speed, concentrated heat source, high thermal efficiency, narrow heat zone
- Labor conditions are better than manual arc welding
- In the welding process does not generate toxic gas
- Easy automation
-Require low welding skills
Disadvantages of TIG welding machine :
- Wind should be avoided so as not to disperse the protective gas
- Some of protection gases are expensive