Which copper gas pipe does the air conditioner weld?
When the copper tube is red, add the silver electrode and watch the solder flow. After one or two seconds or so, remove the flame quickly. So, after one or two times, the copper tube is soldered. Try a few more times and you'll be a good welder.
When the copper tube is red, add the solder. The key is to put the copper red plus solder, it is worth noting that copper can't burn too red, burning too red, silver electrode is added up, more and more will flow below the crater, but above the weld solder less.
Oxygen welding is essential in the welding of steel tubes. The other can be replaced by acetylene or ordinary liquefied petroleum gas or lighter gas. Start with combustible gas, then turn on the oxygen, adjust the flame, then heat the copper tube.
