Author Question: When brazing is finished, which of the following valves should be shut off first? a. Acetylene ... (Read 25 times)

asan beg · **on:** Jul 24, 2018

When brazing is finished, which of the following valves should be shut off first?

a. Acetylene valve on the tank regulator
b. Oxygen valve on the tank regulator
c. Acetylene valve on the torch handle
d. Oxygen valve on the torch handle

Question 2

Which of the following statements about brazing dissimilar metals is incorrect?

a. Always use a phosphorus alloy to braze dissimilar metals.
b. Always use a flux, even when one of the metals is copper.
c. Different metals have different melting points.
d. Different metals expand at different rates.