Class 5 Boiler Practice Exam

Which of the following statements is false regarding stress relieving?

1. It is a form of heat treatment

2. Heat treating can eliminate residual stresses

3. Stress relieving is only used for aluminum

4. It is beneficial in improving material strength

The correct answer is: Stress relieving is only used for aluminum

Stress relieving is a process used to reduce residual stresses in materials that may have been introduced during manufacturing processes such as welding, casting, or machining. This is achieved through controlled heating and cooling. The assertion that stress relieving is only used for aluminum is misleading. In reality, stress relieving is applicable to a wide range of materials, including steels, alloys, and other metals, not just aluminum. Different materials may require specific temperature ranges and time intervals during the stress relieving process, but the technique itself is widely used across various metal types to improve their overall properties and performance. The other statements are accurate: stress relieving is indeed a form of heat treatment, it can effectively eliminate or reduce residual stresses, and it is beneficial for improving material strength and performance by ensuring a more uniform distribution of internal stresses, which can help prevent catastrophic failure during use.