What is the welding of the gas metal arch?

welding the arc of the gas metal arch (GMAW) is a welding method that causes the metal objects to be combined into a single body. An electricity arch is used to heat metal and continuous consumer electrode wire. To prevent nitrogen and oxygen from preventing the weld problems to prevent nitrogen and oxygen in the air; The selection of gas varies depending on welded metals, but a mixture of gas may include carbon dioxide, argon and helium. The nature of this type of welding makes it impractical to use outdoors. Due to their extensive use, many main companies use the arc welding with a gas metal arch, especially for arc welding. It was also accepted in the area of ​​automated welding, where robots process work pieces and welding weapon to speed up the production process.

There are four basic types of gas metal arc: spray, pulse spraying, metal transmission and short -circuit. Each type differs from dependentThose on how the metal is transmitted from the electrode. Globular and short -circuit can only be used on railway metals that contain iron.

Spray was the first type developed and requires a high temperature to evaporate metal and transfer it along the arch. Although this method creates a high quality weld, the required heat is best for stronger metals and a larger weld area. Pulse-Sprey, newer development, works in a similar way, but uses current pulses and does not require the same heat level; This makes it more practical for a wider range of applications.

Globular metal transmission is generally considered to be the least desired method of GMAW because the electrode drips from the wire and can spray. It tends to be more efficient, but requires cheaper dioxide shielding gas. Shorting also transmits the metal in droplets, but lower current and slower feed rate means less spray and often better weld. But it may be slower than other meTody and may not work on stronger materials.

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welding of the gas metal arc has evolved as an attempt to improve the welding of the gas tungsten (GTAW). This process, which used an inconsistent tungsten electrode instead of consumer wire, was somewhat slow, especially on thicker pieces of metal. By switching to another type of electrode, this process could be done faster and therefore more favorable.

In its early development, the gas used in welding the arc of the gas metal arch was inert, as was the case with GTAW. However, inert gases, like Argon, are expensive and only when the reactive shading of gases has become common carbon steel, which have gained popularity. Originally, electrode aluminum wires were used, but the process also improved for included titanium, manganese and silicon.

welding of the arc of a gas metal arch is considered to be a relatively easy process, especially compared to other types of welding, such as GTAW. SvThe air guns power the electrode wire automatically, helping to simplify the process. However, all welding is potentially dangerous and proper measures in the field of training and safety are always required. The welder can be exposed to toxic gases and high heat levels, so that proper protective clothing should always be worn.