FAA Powerplant Written Practice Test

What effect do poorly executed welds have on exhaust systems?

1. Improve thermal distribution

2. Cause local hot spots

3. Increase exhaust flow

4. Enhance structural integrity

The correct answer is: Cause local hot spots

Poorly executed welds in exhaust systems can lead to the formation of local hot spots. When welds are not done properly, they may create areas of reduced strength or poor heat distribution. These weak points can cause certain sections of the exhaust system to overheat more than others, leading to localized high temperatures. This can result in premature failure of materials due to thermal stress, eventually leading to cracks or other forms of damage in the exhaust system. In contrast, well-executed welds ensure a uniform connection that distributes heat more evenly. This helps to prevent hot spots, promotes proper function of the exhaust system, and extends the lifespan of the components involved.