Indo Autotech Interview Questions, Process, and Tips

The liquid used in welding penetration test is dye penetrant.

• Dye penetrant is a liquid that is applied to the surface of the weld.

• It seeps into any cracks or defects in the weld.

• After the excess penetrant is wiped away, a developer is applied to make the defects visible.

• This test is used to check the quality of the weld and ensure it is free from defects.

Gases commonly used in welding are argon, helium, carbon dioxide, and oxygen.

• Argon is used for TIG welding of non-ferrous metals.

• Helium is used for TIG welding of thick materials.

• Carbon dioxide is used for MIG welding of steel.

• Oxygen is used for oxy-fuel welding and cutting.

• Gas mixtures like argon and carbon dioxide are also used for MIG welding.

The voltage and current used in welding depend on the type of welding process and the materials being welded.

• For example, in shielded metal arc welding (SMAW), the voltage typically ranges from 20-30 volts and the current ranges from 50-200 amps.

• In gas metal arc welding (GMAW), the voltage ranges from 15-40 volts and the current ranges from 50-350 amps.

• The voltage and current settings also depend on the thickness of th...read more

Welding is a process of joining two or more metal pieces together by heating them to a high temperature and applying pressure.

• Welding involves melting the metal pieces to be joined

• The melted metal cools and solidifies, forming a strong bond

• Different types of welding include MIG, TIG, and stick welding

• Welding is used in various industries such as construction, manufacturing, and automotive

• Welding requires safety precaut...read more

There are several types of welding techniques used in various industries.

• Arc welding is the most common type, which uses an electric arc to create heat and join metals.

• Gas welding involves the use of a fuel gas and oxygen to generate heat for welding.

• Resistance welding uses electric current and pressure to join metals.

• TIG (Tungsten Inert Gas) welding is used for high-quality welds on thin materials.

• MIG (Metal Inert Gas...read more