What is a key advantage of using flux-cored arc welding (FCAW)?

One key advantage of using flux-cored arc welding (FCAW) is its ability to perform well on rusted or contaminated materials. The process involves using a tubular electrode filled with flux, which generates protective gases and slag as it melts. This feature is particularly beneficial in situations where the base materials may not be perfectly clean, as the flux can help shield the weld area from atmospheric contamination, leading to a more robust and reliable weld. This characteristic makes FCAW a preferred choice in many construction and maintenance applications where surface preparation may be limited.

The other choices, while they may present valid aspects of FCAW, do not signify its defining advantage as effectively as the ability to work on less-than-ideal surfaces does.