PTC has air type resistance spot welding, gas metal arc welding, gas tungsten arc welding and ordinary arc welding machines. Air type resistance spot welding is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current flow. Work-pieces are held together under pressure exerted by electrodes. The process uses two shaped copper alloy electrodes to concentrate welding current into a small spot and to simultaneously clamp the sheets together. Forcing a large current through the spot will melt the metal and form the weld. The sheet metal that can be spotted ranges from 0.5mm to 3.5mm. The machine offer high efficiency welding for sheet metal and can be adjusted to access a variety of work piece shapes. Gas metal arc welding is sometimes referred to by its subtype’s metal inert gas (MIG) welding or metal active gas (MAG) welding. It is a semi automatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun and we use carbon dioxide as a semi-inert gas. Gas tungsten arc welding is frequently referred to as TIG welding and is commonly use in high quality welding process. It has become a popular choice of welding process when high quality, precision welding is required. For ordinary arc welding, this will be used for the fabrication of our home furnishings.
Tungsten Inert Gas (TIG) Welding
Uses the heat generated by an electric arc struck between a non-consumable tungsten electrode and the work piece to fuse metal in the joint area and produce a molten weld pool. The arc area is shrouded in an inert or reducing gas shield to protect the weld pool and the non-consumable electrode. The process may be operated autogenously, that is, without filler, or filler may be added by feeding a consumable wire or rod into the established weld pool. TIG produces very high quality welds across a wide range of materials with thicknesses up to about 8 or 10mm. It is particularly well suited to sheet material.
Metal Inert Gas (MIG) Welding
A welding process that uses the heat generated by a Direct Current electric arc to fuse the metal in the joint area. A continuous electrode (the wire) is fed by powered feed rolls (wire feeder) into the weld pool.
Arc welders may use either consumable or non-consumable electrodes as well as either alternating (AC) or direct (DC) current for their power. This power supply is used to form an electric arc between electrodes and base materials.
Manual welding calls for a constant current of electricity. The constant power supply is important due to the fact that it can be hard to hold the electrode rod perfectly steady when welding manually. The arc length and voltage would fluctuate as the electrode rod moves, but the constant power supply helps to keep them steady enough to make a good weld.