Question

The welding process that uses a non-consumable electrode to produce the weld and the weld area is protected from atmospheric contamination by inert shielding gas is:

A) Submerged arc weld
B) Gas tungsten arc weld
C) Oxyfuel weld
D) Shielded metal arc weld

Answer 1

The correct answer is B) Gas tungsten arc weld. It uses a non-consumable tungsten electrode and inert shielding gas to protect the weld area. The process is vital for creating high-quality, precise welds in various applications.

Step-by-step explanation:

The welding process that uses a non-consumable electrode to produce the weld, with the weld area being protected from atmospheric contamination by an inert shielding gas, is known as Gas Tungsten Arc Welding (GTAW) or Tungsten Inert Gas (TIG) welding. This technique uses a tungsten electrode that does not melt during the welding process and hence is described as non-consumable. Protective gear such as welder's gloves and helmet are crucial for safety as they protect the welder from the electric arc's intense thermal energy and electromagnetic radiation.

Additionally, to protect metal from corrosion, a technique called cathodic protection is used. This approach involves attaching a more reactive metal (called a sacrificial anode) to the metal needing protection. The sacrificial anode will eventually dissolve while protecting the more valuable metal from corrosion, like what happens with galvanized steel where steel is coated with a layer of zinc for protection.