Before welding repairs are performed to...

Question 1 / 270705eccef9cbacbc34ba4d45a4d

Question 1 of 270705eccef9cbacbc34ba4d45a4d

Before welding repairs are performed to repair a crack, what is the correct procedure for performing an emergency crack stopper?

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Question 1 of 27070

Before welding repairs are performed to repair a crack, what is the correct procedure for performing an emergency crack stopper?

🔍 Key Concepts

• Purpose of a crack stopper in metal plating or structure • How drilling a hole at the end of a crack affects stress concentration and crack propagation • Why it might be necessary to treat both ends of a crack rather than just one

💭 Think About

• Think about how a crack in a plate tends to grow under load. From which point(s) can it continue propagating if only one end is treated? • Consider what drilling a smooth, round hole does to the sharp tip of a crack. How does this change the way stress is distributed at that location? • Ask yourself whether the crack should terminate exactly at the hole edge or be contained fully within the drilled area.

✅ Before You Answer

• Verify whether standard practice is to relieve stress at one end or both ends of a crack before welding. • Check whether a smooth drilled hole is intended to fully surround the crack tip or just meet it. • Confirm the typical size and placement of an emergency crack-arrest hole used in shipboard steel repairs.

Question 1 of 27070

Before welding repairs are performed to repair a crack, what is the correct procedure for performing an emergency crack stopper?

A 3/8-inch hole should be drilled at one end of the crack only, making sure that none of the crack extends beyond the hole.

A 3/8-inch hole should be drilled at each end of the crack, making sure that none of the crack extends beyond the two holes.

A 3/8-inch hole should be drilled at one end of the crack only, making sure that approximately 1/2-inch of the crack extends beyond the hole.

A 3/8-inch hole should be drilled at each end of the crack, making sure that 1/2-inch of the crack extends beyond the two holes.

Question 1 / 270705eccef9cbacbc34ba4d45a4d

Question 1 of 270705eccef9cbacbc34ba4d45a4d

Before welding repairs are performed to repair a crack, what is the correct procedure for performing an emergency crack stopper?

Back

Question 1 of 27070

Before welding repairs are performed to repair a crack, what is the correct procedure for performing an emergency crack stopper?