Welding is a fabrication method for joining materials, mainly metals or thermoplastics, by melting them together and allowing them to cool, resulting in fusion. Welding differs from lower-temperature methods like brazing and soldering in that it does not melt the base metal.
A gas flame (chemical), an electric arc (electrical), a laser, an electron beam, friction, and ultrasound are all examples of energy sources that can be used for welding. Welding can take place in a variety of settings, including the open air, beneath water, and even in space.
Burns, electric shock, visual damage, inhalation of dangerous gases and fumes, and exposure to extreme ultraviolet radiation are all risks associated with welding.
Metal joining has a long history dating back millennia. The earliest examples of this may be found in Europe and the Middle East during the Bronze and Iron Ages. Glaucus of Chios “was the guy who single-handedly created iron welding,” according to Herodotus in The Histories of the Fifth Century BC. The Iron pillar of Delhi, weighing 5.4 metric tons and erected in Delhi, India in 310 AD, was built via welding.
Some of the most common current welding methods are:
- Shielded metal arc welding (SMAW), also known as “stick welding.”
- Gas tungsten arc welding (GTAW), also known as TIG (tungsten, inert gas).
- Gas metal arc welding (GMAW), also known as MIG (metal, inert gas).
- Flux-cored arc welding (FCAW), very similar to MIG.
- Submerged arc welding (SAW), usually called Sub Arc.
- Electroslag welding (ESW), a highly productive process for thicker materials.
Various positions can be used and certified such as the following:
- 1G – When the weld is done in a flat position to the welder
- 2G – When the weld is done in a horizontal position to the welder
- 3G – When the welding is done in a vertical position to the welder
- 4G – When the welding process takes place overhead of the welder
- 5G – When the welding process is done at a fixed horizontal position (used in pipe welding only)
- 6G – When the welding process is done in an overhead position (used in pipe welding only)
A number of power supplies can be utilized to provide the electrical power required for arc welding procedures. Constant current and constant voltage power supplies are the most prevalent welding power supply. The length of the arc in arc welding is proportional to the voltage, and the quantity of heat input is proportional to the current. Because they maintain a reasonably constant current even when the voltage varies, constant current power supply are most commonly employed for manual welding techniques like gas tungsten arc welding and shielded metal arc welding.
This is significant because it might be difficult to maintain the electrode precisely still during manual welding, causing the arc length and hence voltage to fluctuate. Constant voltage power supplies vary the current while keeping the voltage constant, making them ideal for automated welding processes like gas metal arc welding, flux-cored arc welding, and submerged arc welding.
The arc length is maintained constant in these processes because any variation in the distance between the wire and the base material is promptly corrected by a considerable change in current. For example, if the wire and the base material come too close together, the current will rapidly increase, causing the heat to rise and the tip of the wire to melt, resetting the separation distance.
In arc welding, the type of current employed is very essential. Direct current is used in consumable electrode techniques like shielded metal arc welding and gas metal arc welding, however the electrode can be charged positively or negatively.
Because the positively charged anode has a higher heat concentration in welding, changing the polarity of the electrode has an impact on weld characteristics. The base metal will be hotter if the electrode is positively charged, enhancing weld penetration and welding speed. A negatively charged electrode, on the other hand, produces shallower welds.
Electric Welder Prices In Ghana
Prices listed here may differ from over dealers. Kindly take note.
|Ingco Welding Machine 160AMP||₵ 681|
|250A Digital Inverter Welding Machine [ EPICA ]||₵ 720|
|Inverter MAG/MIG/MMA/TIG Welding Machine||₵ 2,300|
|400BS Portable Welding Machine||₵ 1,000|
|300A EDON Welding Machine||₵ 1,000|
|Intimax Master 315s Welding Machine||₵ 1,100|
|MMA Welding Machine 250A||₵ 1,000|
|Welding Machine B. (ZX7-400)||₵ 4,890|
|Welding Machine C. ( ZX7-315)||₵ 3,999|