17 Questions
What is the fuel gas generally employed in gas welding?
Acetylene
Which type of flame is considered the most versatile and hottest in welding?
Oxy-acetylene flame
What is the temperature reached by the oxy-acetylene flame used in welding?
$3300°C$
What is added to the molten metal pool in gas welding to build up the seam slightly for greater strength?
Filler metal rod
Why is the correct type of flame considered essential in oxy-acetylene welding?
To control welding joint and process
Which property of a metal indicates the ease with which it can be welded with other similar or dissimilar metals?
Weldability
What is the best weldability metal amongst metals according to the text?
Plain low carbon steel
Which factor does NOT influence the weldability of a material?
Electrical conductivity
What is generally observed about materials with high castability in relation to weldability?
They have low weldability
Which terminological element refers to the joining surfaces of metals being prepared first for welding?
Edge preparation
In welding butt joints, which edge preparation involves a single bevel?
Single-U
What happens to the composition of crystals as they freeze during welding?
They readjust their composition to that of the initial liquid alloy.
Which welding process is particularly well-suited for joining rails?
Thermit welding
What is a common issue that arises in the final weld due to the cooling of the metal?
Presence of gas pockets and porosity
Which industry commonly utilizes cold pressure welding?
Food processing industry
What type of welding process is more prevalent in the aeronautical and nuclear industries?
Gas tungsten arc welding
Which type of welding is considered a general purpose process with a wide range of applications?
Oxyacetylene welding
Test your knowledge on how the microstructure of weld metals changes during the welding process and the composition adjustments that occur. Explore the concept of equilibrium in weld metal composition and its interaction with gases during welding.
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