Friends, I welcome you to our channel for self-taught beginners in welding and locksmiths. Most welded structures on their site are now assembled from shaped pipes with a thickness of 1.5 or 2 mm.
The metal for beginners is quite thin and there will be frequent burn-throughs during welding. We need to reduce the likelihood of these burns. To do this, first of all, we will correctly connect the cables of the holder and mass to our inverter.
There is such a concept in welding - polarity. Polarity is where we connect the holder wire and the ground wire to the device. Polarity is direct and reverse.
Direct polarity is when we connect the holder with the electrode to the negative socket of the inverter, connect the clothespin to the positive connector. The reverse, respectively, on the contrary, the holder with the electrode is connected to the plus of the inverter.
Why do we need to know this and how to use it? And simply a thin profile pipe is better to cook on straight polarity. What I mean. On straight polarity-minus on the grip, there will be less chance of burning. It's just that the penetration depth of the metal will be less so. This is what we need.
However, not all electrodes are suitable for straight polarity welding. On straight polarity, you can weld with rutile electrodes. Rutile can generally be welded on both straight and reverse polarity.
But electrodes with a basic coating for our purposes - welding of a thin professional pipe, will not work. Such electrodes are cooked only on reverse polarity, and the welding itself is carried out mainly as a solid, without frequent breaks.
Friends, just try, compare, connecting the arm and the mass in different ways. This will be immediately clear even to a complete beginner, the difference in penetration depth will show how easier and better.