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Mig

MIG welding, also known as GMAW or MAG welding, is an automatic or semi-automatic arc welding process that uses a continuous solid wire electrode and shielding gas to join base metals. The process involves an electric arc between the wire and workpiece, with various shielding gases and filler wires tailored for different applications. Advantages include high productivity, cleaner welds, ease of learning, and suitability for thin sheet welding and mass production.

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18 views1 page

Mig

MIG welding, also known as GMAW or MAG welding, is an automatic or semi-automatic arc welding process that uses a continuous solid wire electrode and shielding gas to join base metals. The process involves an electric arc between the wire and workpiece, with various shielding gases and filler wires tailored for different applications. Advantages include high productivity, cleaner welds, ease of learning, and suitability for thin sheet welding and mass production.

Uploaded by

MADUGULA RAVI TEJA
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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MIG – Metal Inert Gas Welding

Also Known As:

• GMAW (Gas Metal Arc Welding) – The formal name for MIG welding.

• MAG Welding (Metal Active Gas) – When using CO₂ or Argon-CO₂ mix.

Definition:

MIG welding is an automatic or semi-automatic arc welding process where a continuous solid wire electrode is fed through a welding gun and joined
with the base metal while protected by a shielding gas. The arc melts both the wire and the base metal to form the weld.

Working Principle:

An electric arc is established between a continuously fed wire electrode and the workpiece. The inert shielding gas (like Argon or Argon mix) protects the
molten weld pool from oxidation and contamination.

Equipment Required:

1. Power Source – Constant voltage (DC), typically DCEP

2. Wire Feed Unit – Drives the electrode wire to the weld area

3. MIG Gun – Delivers wire and gas to the weld pool

4. Shielding Gas Supply – Argon, CO₂, or mixed gases

5. Work Clamp – Ground connection to complete the circuit

6. Filler Wire – Usually ER70S-6 or other types based on base metal

Shielding Gases:

Gas Type Application

100% Argon For non-ferrous metals (aluminum, copper)

CO₂ (100%) Deep penetration, more spatter

Argon + CO₂ (80/20) Smooth arc, better control, less spatter – commonly used for carbon steel

Ar + He + O₂ For specialized applications

Filler Wires (Common Grades):

Wire Type Use

ER70S-6 For carbon steel – good for mild steel

ER308L For stainless steel

ER5356 For aluminum alloys

Advantages of MIG Welding:

• High productivity – continuous wire feed means no stopping to change electrodes.

• Cleaner welds – minimal spatter, no slag to chip.

• Easier to learn – less manual dexterity needed compared to TIG or SMAW.

• Ideal for thin sheet welding and mass production.

• Can be semi-automated or robotic.

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