Diversi tipi di saldatura

Esistono più di trenta tipi diversi di saldatura, dalla semplice saldatura ossi-combustibile (usando una fiamma) ai processi ad alta tecnologia come la saldatura laser.Le quattro saldature più comunemente utilizzate sono la saldatura ad arco MIG, TIG, Stick e Flux-Cored. Questo articolo spiegherà la differenza tra loro.

La saldatura elettrica è l'unione di metallo usando un arco elettrico e un elettrodo o filo metallico di riempimento. La saldatura viene eseguita creando un arco tra il metallo base (il metallo che viene saldato) e il metallo di riempimento. L'arco fonde il metallo di base e il riempitivo Metallo, combinandoli in un unico materiale per unire i metalli di base: il metallo di apporto viene consumato nel processo.

Saldatura a bastoncino (SMAW o Saldatura ad arco in metallo schermato)

MIG Welding (Metal Inert Gas, also known as GMAW or Gas Metal Arc Welding)

MIG (Metal Inert Gas) Welding (also called GMAW or Gas Metal Arc Welding) joins metals by heating them with an arc between a continuously fed wire (filler metal electrode) and the workpiece. The molten weld metal is protected from oxides and nitrides in the atmosphere by an externally supplied shielding gas. The GMAW process can be used to weld a wide range of alloys including carbon steel, stainless steel, magnesium, nickel, copper, silicon bronze and aluminum.
The type of shielding gas depends on the type of wire. For mild steel wire, the gas is C25 (that is, 75% Argon and 25% CO₂) or CO₂. For aluminum wire, the gas is Argon. For stainless steel wire, the gas is called "tri-mix" (a mixture of Argon, CO₂ and helium).
For more details about TOPWELL MIG Welding
Typical Uses: Small to large manufacturing, Auto Body, Fabrication

Flux Cored Arc Welding (FCAW)

Flux-cored Arc Welding is a welding process similar to GMAW, in that it uses a continuously fed electrode, but uses a tubular wire filled with flux instead of a solid wire. There are two types of flux-cored wire, self-shielded and dual shield. Self-shielded is used without the aid of an external gas shield and uses the flux to shield the molten weld puddle. Dual shield uses the flux and an external shielding gas to protect the molten weld puddle. Typical shielding gases are carbon dioxide and argon/carbon dioxide mixes. Self-shielded wires are optimal for outdoor use, even in windy situations. Both wires produce a slag covering on the finished weld.
Typical Uses: Thick materials, Steel Erection, Heavy Equipment construction or repair

TIG Welding (Tungsten Inert Gas, also known as GTAW or Gas Tungsten Arc welding)

Like the GMAW process, the molten weld puddle needs to be shielded by an external gas supply.
TIG Welding (also called GTAW or Gas Tungsten Arc Welding) is a welding process that uses a non-consumable tungsten electrode to heat the base metal and to create a molten weld puddle. The tungsten electrode, unlike a stick electrode, does not become part of the completed weld. An external filler rod can be added into the molten puddle to create the weld bead and increase mechanical properties. Like the GMAW process, argon inert gas or inert gas mixtures are used for shielding. Argon/helium mixtures can be used on heavy aluminum. GTAW can be used to weld most alloys.
For more details about TOPWELL TIG Welding
Typical Uses: Aerospace welding, piping systems, motorcycles or bikes

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