AWS AWS Weld Metallurgy & Heat Treatment 2

Question 1

Heat input in welding is calculated using which formula?

Accepted Answer

(Voltage × Amperage × 60) / Travel Speed

Answer

Heat input (J/in) is calculated as (Voltage × Amperage × 60) / Travel Speed in inches per minute.

Question 2

Increasing travel speed in welding generally:

Accepted Answer

Decreases heat input and narrows the HAZ

Answer

Faster travel speed reduces heat input per unit length, resulting in a narrower HAZ and less distortion.

Question 3

Weld distortion is primarily caused by:

Accepted Answer

Uneven heating and cooling creating differential thermal expansion and contraction

Answer

Distortion results from uneven expansion during heating and contraction during cooling, which creates internal stresses that deform the workpiece.

Question 4

Backstep welding is a technique used to:

Accepted Answer

Reduce distortion by controlling the sequence of weld deposits

Answer

Backstep welding involves making short weld segments in a direction opposite to the overall progress, which helps distribute heat more evenly and reduce distortion.

Question 5

Peening a weld bead is done to:

Accepted Answer

Introduce compressive stresses to counteract tensile shrinkage stresses

Answer

Peening plastically deforms the weld bead, introducing compressive stresses that help offset the tensile residual stresses caused by weld shrinkage.

AWS Practice Test

AWS Practice Test

AWS AWS Weld Metallurgy & Heat Treatment 2