The welding


Since ancient times man has felt the need to join two pieces of metal to create a unique product. To address this need , despite precarious means and unknowingly created the welding process .
The welding is a type of joint that allows to combine , permanently , solid parts , realizing the continuity of the material.
Initially, the welding was done by typing : the two ends to be joined were heated in a furnace , superimposed on an anvil , and with the power of man, were hammered and shaped giving the final product the desired shape.
Only in 1895 the French chemist Charles Picard invented the oxyacetylene torch . This technology still applied is defined as the welding flame .
Then we moved to the voltaic arc welding with coated electrode welding application , this technology is defined as arc welding .
The two above-mentioned manual welding techniques , although very effective, are quite laborious requiring relatively long execution times .
To meet the needs of industrial production was invented wire welding ; welding becomes semi-automatic or fully automatic : it is born then the MIG (Metal Inert Gas) and MAG ( Metal Active Gas) .
This technology still meets the requirement of production.
Again for reasons related to the productivity of the process , and then machining times , was born the submerged arc welding that is a hybrid between the welding wire and the electrode ; namely that it exploits the coil as a filler material and the coating , in the form of granules , which covers the melting bath .
The need to improve quality in manufactured goods has led to yet another innovation of welding technology by creating the TIG ( Tungsten Inert Gas) .
Then also the TIG suffers innovations , as always linked to the need for greater speed of production : hence, the plasma welding that can weld 10 mm thick in a single pass .
By plasma welding is then passed to the laser welding giving you the ability to weld thicker than 150mm in a single pass .
All welding processes mentioned above are currently used .
Most of the technologies have been designed to meet the demand for high productivity but beware: not always the high productivity goes hand in hand with the quality of the welded joint , it is necessary to apply the method with processes , controlling the welding technique , leaving nothing to chance errors in production are not rare and when they occur they can have serious effects on the safety of the final product and lead to serious economic damage.
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