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NCCER HVAC Level 1, Module 8 - Soldering/Brazing Exam 2025 Questions & Answers with 100% Correct Answers | Verified

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What is a neutral flame? - Equal parts oxygen and acetylene What is a carburizing flame? - A cooler flame used for light brazing. At what PSI does Acetylene become unstable? - 15 psi What do you use to light a torch? - Cup Striker Why is it dangerous to use a lighter to light a torch? - The flame may travel back into the lighter and cause it to explode. How far do you open the acetylene valve on the tank when brazing? - 1/2 turn to a full turn What is an alloy? - Any substance made up of two or more metals. What did the Federal Safe Drinking Water Act do? - It banned solders containing more than 0.2% of lead in piping for use in potable (drinking) water systems. What is the most common solder used on low pressure applications and water lines? - 95% tin/5% antimony What is 50/50 tin/antimony alloy used for? - Suitable for low/non pressure applications. Provides limited strength. NOT suitable for water lines.

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