Welding is a fabrication process that joins materials, usually metals or thermoplastics. This done by using high heat to melt the parts together and allowing them to cool, causing fusion. Many different energy sources can be used for welding, including a gas flame (chemical), an electric arc (electrical), a laser, an electron beam, friction, and ultrasound. welding may be performed in many different environments, including in open air, under water, and in outer space. Welding is a hazardous undertaking and precautions are required to avoid burns, electric shock, vision damage, inhalation of poisonous gases and fumes, and exposure to intense ultraviolet radiation.
The equipment which provides electric current to join the metals or thermoplastics by creating coalescence often by melting small portions of them is known as welding machine. Welding joints different metals with the help of a number of processes in which heat is supplied either electrically or by mean of a gas torch. Different welding processes are used in the manufacturing of Auto mobiles bodies, structural work, tanks, and general machine repair work. In the industries, welding is used in refineries and pipe line fabrication. It may be called a secondary manufacturing process. There are different processes of welding like arc welding, MIG welding and TIG welding.
Features of Welding Machine:
A complete welding machine is comprised of a complete welding, surfacing, or cutting machine, equipment, or system. It also include a power source, torch or gun, cables, feeders, positioners, robots, or other required components. A power source for a welding machine or a joining machine provides a TIG gun, MIG gun, electrode holder, laser, electron beam gun or other welding unit with the required output power to melt material. Welding monitors or controllers for welding machines are instruments that sense welding quality (nugget size or weld integrity) or output power supply variations. Also, welder controllers are used to adjust welding parameters to compensate for variations in weld quality or output power.
Types of Welding:
Among the arc or resistance-welding types that apply to welding machines are:
- Flux Cored Arc Welding (FCAW)
- Gas Metal Arc Welding (GMAW)
- Orbital / Tube Arc Welding
- Plasma arc welding
- Flash welding
- Projection welding
- Resistance seam welding
- Spot welding
- Shielded Metal Arc Welding (SMAW)
- stud arc welding
- Submerged arc welding (SAW)
- Gas Tungsten Arc Welding (GTAW)
Frictional or other fusion welding types that apply to welding machines include:
- Electron beam welding
- friction welding
- Hot plate welding
- plastic welding
- Laser welding
- Oxyfuel welding
- Thermite or exothermic welding
- ultrasonic or linear friction welding
When looking into entire welding machine systems, you must consider output power specifications as well as the power systems for these machines. You need to be aware of the duty cycle, or the percentage of time the welding unit can remain on in a ten-minute period before powering off to cool and prevent damage to components. Check the output power capability specifications, which include AC output, DC output, AC/DC selectable output, and high frequency. Find out what the output current range of the welding or joining machine system is. This is the designed current range of the welding unit or the current range monitored or controlled. Also look at the output voltage range, which is the designed voltage range of the welding unit or the voltage range monitored or controlled.