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Arc welding

Shielded metal arc welding (SMAW)

Shielded metal arc welding (SMAW), also known as manual metal arc (MMA) welding or as stick welding, is a manual arc welding process that uses a consumable flux coated electrode to lay the weld. An electric current, in the form of either alternating current or direct current from a welding power supply, is used to form an electric arc between the electrode and the metals to be joined.

Application fields : Sheet metal work, pipes, pipelines, metal framework, shipbuilding, lifting gear …

Gas Tungsten Arc Welding (GTAW)

GTAW, also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a nonconsumable tungsten electrode to produce the weld. The weld area is protected from atmospheric contamination by an inert shielding gas and a filler metal can be used.

Application fields : High quality welds in nuclear, aeronautical and chemical industries, penetration passes

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Gas Metal Arc Welding (GMAW)

GMAW, sometimes referred to by its subtypes metal inert gas (MIG) welding or metal active gas (MAG) welding, 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.

CEWAC developed a GMAW application for welding narrow joints.

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Applications : tôlerie, construction navale, construction mécanique (châssis, ensemble mécano-soudé…), charpente métallique, ponts, engins de levage, réservoirs,... (vidéo « semi-auto »)

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Plasma arc welding (PAW)

Plasma arc welding is an arc welding process similar to GTAW. The electric arc is formed between an electrode and the workpiece. The key difference with GTAW is that in PAW, by positioning the electrode within the body of the torch, the plasma arc can be separated from the shielding gas envelope.

The plasma is then forced through a fine-bore copper nozzle which constricts the arc and the plasma exits the orifice at high velocities and a temperature approaching 20000 °C.

Application fields : Longitudinal welding of tubes, containers, tanks, ….

 

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