Answer :

Final answer:

For oxyacetylene welding, the acetylene regulator should generally be set to 10 PSI, ensuring a balance between safety and effectiveness. This setting minimizes risks such as backfires, with variations depending on material thickness and manufacturer guidelines.

Explanation:

The question about setting the acetylene regulator when performing oxyacetylene welding pertains to a crucial aspect of welding safety and efficiency. When it comes to adjusting the acetylene regulator for oxyacetylene welding, the correct setting is essential to ensure a proper balance between safety and the effectiveness of the welding process. Among the provided options, (a) 10 PSI is generally recommended for most oxyacetylene welding tasks. This setting helps in maintaining a stable flame and prevents the risk of causing backfires or flashbacks, which can happen if the acetylene pressure is too high. However, it's important to note that the specific pressure settings can slightly vary depending on the thickness of the material being welded and the manufacturer's guidelines on the welding equipment.

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