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Consider the following statements: In metal arc welding 1. Utilizes a consumable electrode 2. A welding torch used is connected to acetylene gas supply 3. The electrode and work-piece are connected to the welding power supply. Which of these statements are correct?

Consider the following statements: In metal arc welding 1. Utilizes a consumable electrode 2. A welding torch used is connected to acetylene gas supply 3. The electrode and work-piece are connected to the welding power supply. Which of these statements are correct? Correct Answer 1 and 3 only 

Concept:

  • Gas metal arc welding is the most widely used joining process due to its ability to provide high-quality welds for a wide range of ferrous and non-ferrous alloys at low cost and high speed.
  • As shown in the figure, gas metal arc welding (GMAW) is an arc-welding process that uses arc plasma between a continuously fed filler metal electrode and the workpiece to melt the electrode and the workpiece.
  • The electrode and workpiece are connected to the welding power supply.
  • The melted filler metal forms droplets and deposits on the partially melted workpiece to form a weld pool.
  • The weld pool solidifies to bond the workpieces after the arc moves away.
  • Shielding gas is fed through the gas nozzle to protect the molten metal from nitrogen and oxygen in the air.
  • GMAW is also commonly known as a metal inert gas (MIG) since inert gases s argon and helium are often used as shielding gas.
  • An active shielding gas containing oxygen and carbon dioxide is also used and thus the GMAW process is also called Metal Active Gas (MAG).

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