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Welding machines are used when pieces of metal need to be permanently joined. Welding machines come in a variety of types and sizes with varied amounts of voltage produced. These output voltages range from a small welder with 80 amps to larger welding machines used in industrial settings that can produce up to 12,000 amps. Depending on the type of welding you will be performing, your machine will range in power from the low end of the scale to the higher end.
Types
Mig welding machines
Regarded as the most versatile and the most common welding machine in home workshops and industry. Can be used for welding several different metals including mild steel, stainless steel and aluminium. Top models include Miller, Lincoln and Hobart.
Tig welding machines
More specialized than mig welders tig machines are used for precision work and can weld more types of metal than any other process. Metals suitable to tig weld are stainless steel, mild steel, aluminum,copper, bronze, brass, gold, magnesium, chromoly, and nickel alloys.
Tig welding gives pure clean welds without splatter, sparks and smoke fumes. Ideal for welding metal artwork, aluminum cycle and motorcycle frames plus clean stainless welding for applications such as food processing equipment.
Arc Welders. Basic weld machine that have been around for many years. Can be purchased for very little money these days and in the right circumstances can be very useful. Ideal for repair work where a mig welder is not suited to such as on site and field work where portability is needed and also where welding gasses can be blown away due to wind.
Spot Welding Machines
Spot Welding is a common resistance welding technique utilized to join 2 to 4 overlapping steel sheets that are anywhere up to 3 mm thick each. In many applications using just 2 overlapping metallic sheets, the sheet thickness could be as much as 6 millimeters. A pair of electrodes are concurrently utilized to secure the metal sheets together and move current throughout the sheets.
Some great benefits of the technique consist of effective power use, restricted workpiece deformation, higher manufacturing rates, simple automation, with no necessary filler materials. Spot welding is employed instead of more expensive mechanized fastening, for example riveting and screwing, and when disassembly for maintenance is not needed. Whilst weld strength at each weld spot is significant, the fact that the weld spots don’t form a continuing seam ensures that the general sturdiness is usually considerably less than with welding techniques, making the procedure suited to only specific applications. It’s utilized broadly within the motor vehicle industry where cars can have several thousand spot welds.
Plastic Welding machines
Plastic welding is one of the most innovative and different kinds of processes. It is specially designed for welding plastic materials, which are otherwise difficult to weld using conventional welding processes. For how to weld plastic parts, the films are fused and pressure is applied against them. The technique of plastic welding is diverse in nature, and has many variants with high number of applications for industrial use.
Functions of welding machine
Welding machines take the electrical current from a high-voltage power source and convert it into a usable arc of energy to fuse two materials together.
Transformer
Are used by some welding machines to convert the high voltage current from the power source to a lower voltage current used for welding. The output current can be adjusted by the welder within a certain range. This allows the welder to properly set the output current for the type of welding that is being performed.
Alternator or Generator
Other types of welding machines use a motor or combustion engine to convert electrical energy into mechanical energy. An alternator or generator is used to convert this mechanical energy into a low-current electrical output.
Inverter
Inverter welding machines produce the high voltages needed for high-intensity arc welding. The machine stores the high voltage current from the wall outlet in a capacitor. A microprocessor then switches the stored energy into a transformed where it is converted into the desired output current.
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