High frequency welding tool technology
The main point is that the flame can't blow for too long, the alloy hair is red and it should be immediately with the matrix, not only faster but also more important. Because it's bad if you don't do it twice
Then an old welder had resoldered it, and it was just the place.I hope my answer will help you.
Not only copper, but also a deoxidizer, and the most commonly used is the pine powder. There is also a certain level of operation, because I've seen a lot of welding common car knives, and the alloy head always falls off at work.