Other Skilled Trades Welding 1

Question 1

What does the acronym MIG stand for in MIG welding?

Accepted Answer

Metal Inert Gas

Answer

MIG stands for Metal Inert Gas, a welding process that feeds a continuous solid wire electrode through a welding gun shielded by an inert gas.

Question 2

Which welding position is considered the most difficult to perform?

Accepted Answer

4G (Overhead)

Answer

The 4G overhead position is considered the most challenging because molten metal tends to drip away from the weld pool due to gravity.

Question 3

What shielding gas is most commonly used for MIG welding mild steel in the US?

Accepted Answer

75% Argon / 25% CO2

Answer

A 75/25 Argon/CO2 mixture (C25) is the most widely used shielding gas for MIG welding mild steel, providing good arc stability and weld appearance.

Question 4

What is the purpose of preheating steel before welding?

Accepted Answer

To reduce the risk of cracking and residual stress

Answer

Preheating reduces the temperature differential between the weld and base metal, slowing cooling rates and reducing the risk of hydrogen cracking and distortion.

Question 5

In AWS welding certification, what does the 'D1.1' designation refer to?

Accepted Answer

Structural welding code for steel

Answer

AWS D1.1 is the American Welding Society's Structural Welding Code for Steel, the most widely referenced welding standard in US structural fabrication.

Other Skilled Trades Practice Test

Other Skilled Trades Practice Test

Other Skilled Trades Welding 1