What should be done after brazing a copper to-copper joint? apply additional flux as the joint cools __ after it cools slightly.reheat it to brazing temperature once again __ wipe the joint down with a wet rag after the filler metal has hardened

## Step 1<br />The problem is about the correct procedure to follow after brazing a copper-to-copper joint. Brazing is a method used to join metals by melting and flowing a filler metal into the joint, which then cools to form a strong bond.<br /><br />## Step 2<br />The options provided are:<br />- Apply additional flux as the joint cools<br />- After it cools slightly, reheat it to brazing temperature once again<br />- Wipe the joint down with a wet rag after the filler metal has hardened<br /><br />## Step 3<br />The correct procedure after brazing a copper-to-copper joint is to allow the joint to cool down. This is because the filler metal needs to harden and form a strong bond between the copper pieces.<br /><br />## Step 4<br />Applying additional flux or reheating the joint to brazing temperature once again is not necessary and could potentially damage the joint.<br /><br />## Step 5<br />Wiping the joint down with a wet rag after the filler metal has hardened is also not necessary and could potentially remove the filler metal, weakening the joint.