Certified Welder Heat Input and Distortion Control

Question 1

What is the correct formula for calculating heat input in welding?

Accepted Answer

(Amps × Volts × 60) / Travel Speed (in/min)

Answer

(Volts × Travel Speed) / Amps

Answer

(Amps × Travel Speed) / Volts

Answer

(Volts + Amps) × Travel Speed

Question 2

What effect does increasing travel speed have on heat input when amperage and voltage remain constant?

Accepted Answer

Decreases heat input

Answer

Increases heat input

Answer

Has no effect on heat input

Answer

Doubles heat input

Question 3

Which type of distortion causes the ends of a welded plate to bow upward along its length?

Accepted Answer

Longitudinal bowing (camber)

Answer

Angular distortion

Answer

Transverse shrinkage

Answer

Buckling

Question 4

What is the primary purpose of preheating base metal before welding?

Accepted Answer

To reduce the risk of hydrogen-induced cracking by slowing the cooling rate

Answer

To increase travel speed

Answer

To increase arc voltage

Answer

To improve electrode deposition rate

Question 5

What does interpass temperature refer to in a multi-pass weld?

Accepted Answer

The temperature of the weld bead before the next pass is deposited

Answer

The temperature of the electrode tip during welding

Answer

The temperature of the shielding gas at the nozzle

Answer

The temperature of the base metal before any welding begins

Question 6

High heat input in welding generally results in which of the following?

Accepted Answer

A larger heat affected zone and coarser grain structure

Answer

A smaller heat affected zone and finer grain structure

Answer

Reduced weld distortion

Answer

Increased weld hardness

Question 7

When voltage and travel speed are held constant in GMAW, which parameter most directly controls heat input?

Accepted Answer

Wire feed speed (which controls amperage)

Answer

Shielding gas flow rate

Answer

Nozzle-to-work distance

Answer

Electrode diameter