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Which of the following statements is correct about inert gas metal arc welding?
In this method, flux is required.
In this method, concentration of heat is difficult.
In this method, concentration of heat is easily possible.
This method is particularly suitable for welding heavy metals.
In this method, concentration of heat is easily possible.
Inert Gas Metal Arc Welding (GMAW), also known as MIG welding, uses a consumable electrode and an inert shielding gas. Because the arc is concentrated between a small-diameter electrode and the workpiece, it provides excellent control over heat input, allowing for precise heat concentration.
AWS A3.0M/A3.0:2020
Inert Gas Metal Arc Welding (GMAW), also known as MIG welding, uses a consumable electrode and an inert shielding gas. Because the arc is concentrated between a small-diameter electrode and the workpiece, it provides excellent control over heat input, allowing for precise heat concentration.
Q=vV├ЧI├Ч╬╖тАЛ
Where┬аQ=Heat┬аinput,V=Arc┬аvoltage,I=Current,╬╖=Efficiency,v=Travel┬аspeed
An electric arc is established between a continuously fed wire electrode and the workpiece. The inert gas (Argon or Helium) shields the molten pool from atmospheric contamination. The high current density on the small diameter wire allows for a highly focused arc and localized heating of the parent metal.
Uses inert gases like Argon, Helium, or mixtures thereof.
Does not require external flux, as gas provides the shielding.
Suitable for high-speed welding and automation.
Provides deep penetration and localized heating.
No slag removal required due to fluxless operation
High deposition rates
Excellent for non-ferrous metals like aluminum and copper
Equipment is complex and relatively expensive
Sensitive to wind (shielding gas can be blown away outdoors)
Requires high operator skill for thin sections
Automotive manufacturing
Structural steel fabrication
Pressure vessel production
Option A is incorrect because MIG/GMAW is a gas-shielded process and does not use solid flux.
Option B is incorrect as the arc characteristic allows for high intensity and easy heat concentration.
Option D is generally less preferred for very thick metals compared to submerged arc welding (SAW) due to its shallow penetration limits.
C is correct тАФ In this method, concentration of heat is easily possible.
Always remember that MIG (GMAW) is flux-free, whereas TIG (GTAW) is also flux-free but uses a non-consumable tungsten electrode.
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