AWS AWS Joint Design & Preparation 4

Question 1

What is the purpose of a backing bar in a groove weld joint?

Accepted Answer

To support the molten weld pool and ensure complete joint penetration

Answer

A backing bar supports the molten weld pool during root pass welding, ensuring complete joint penetration without burn-through.

Question 2

When a T-joint is designed with a fillet weld on both sides, what is the primary benefit compared to a single-sided fillet weld?

Accepted Answer

It reduces angular distortion and increases load-carrying capacity

Answer

Double-sided fillet welds balance thermal stresses, reducing angular distortion while doubling the effective throat area for higher load capacity.

Question 3

According to AWS standards, what does the term 'effective throat' refer to in a fillet weld?

Accepted Answer

The theoretical distance from the root to the hypotenuse of the largest right triangle inscribed in the fillet cross-section

Answer

Effective throat is the theoretical distance from the root to the weld face hypotenuse, used to calculate the load-bearing capacity of fillet welds.

Question 4

Which joint design is most susceptible to lamellar tearing?

Accepted Answer

T-joints and corner joints with through-thickness loading on thick plates

Answer

T-joints and corner joints subject thick base metal to through-thickness stress, which can cause lamellar tearing along sulfide inclusions in the steel.

Question 5

What is the function of a weld access hole (also called a rat hole or cope hole) in structural steel connections?

Accepted Answer

To allow the welder access to make a continuous weld past a flange-web intersection

Answer

Weld access holes are cut into the web at beam-to-column connections to allow full-length continuous welds on flanges without interruption at the web.

AWS Practice Test

AWS Practice Test

AWS AWS Joint Design & Preparation 4