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mig welding wire

TigSure Welding Wire Factory

mig welding wire

Country/Region China
City & Province Dezhou Shandong

Product Details


mig welding wire

Mig welding wire can be aluminum welding wire, stainless steelwelding wire or other alloy wire specially for mig weldingprocesses.
Solid wire MIG welding:
Metal inert gas (MIG) welding wasfirst patented in the USA in 1949 for welding aluminium. The arc and weld poolformed using a bare wire electrode was protected by helium gas, readilyavailable at that time. From about 1952 the process became popular in the UK forwelding aluminium using argon as the shielding gas, and for carbon steels usingCO 2 . CO 2 and argon-CO 2 mixtures are known as metal active gas (MAG)processes. MIG is an attractive alternative to MMA, offering high depositionrates and high productivity.

Process characteristics

MIG is similar to MMA in that heat for welding is produced byforming an arc between a metal electrode and the workpiece; the electrode meltsto form the weld bead. The main differences are that the metal electrode is asmall diameter wire fed from a spool and an externally supplied shielding gas isnecessary. As the wire is continuously fed, the process is often referred to assemi-automatic welding.

Shielding gas

In addition to general shielding of the arc and the weld pool,the shielding gas performs a number of important functions:

forms the arc plasma
stabilises the arc roots on thematerial surface
ensures smooth transfer of molten droplets from the wire tothe weld pool
Thus, the shielding gas will have a substantial effect on thestability of the arc and metal transfer and the behaviour of the weld pool, inparticular, its penetration. General purpose shielding gases for MIG welding aremixtures of argon, oxygen and CO 2 , and special gas mixtures may containhelium. The gases which are normally used for the various materials are:

steels
CO 2
argon +2 to 5% oxygen
argon +5 to 25% CO2
non-ferrous
argon
argon / helium
Argon based gases, compared withCO 2 , are generally more tolerant to parameter settings and generate lowerspatter levels with the dip transfer mode. However, there is a greater risk oflack of fusion defects because these gases are colder. As CO 2 cannot be used inthe open arc (pulsed or spray transfer) modes due to high back-plasma forces,argon based gases containing oxygen or CO 2 are normally employed.

Applications

MIG is widely used in most industry sectors and accounts formore than 50% of all weld metal deposited. Compared to MMA, MIG has theadvantage in terms of flexibility, deposition rates and suitability formechanisation. However, it should be noted that while MIG is ideal for'squirting' metal, a high degree of manipulative skill is demanded of thewelder.

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