| The Electric Arc (AE) of Zincatura a Spruzzo It is a simple technology and similar portable equipment for MIG. In both cases, you get high-quality surface deposits, at low cost (for the high speed of the EA), not only in the factory but also in situ in the external yards. | |
| Schematically the AE in the spray galvanizing is achieved by means of a transformer – rectifier that provides DC power with constant voltage – a set of cables and hoses – a two-wire feed system (electrodes) and a gun end of which shell the AE, which melts the atomized metal and projected at a speed of 250m / sec. the previously sandblasted support (SADDLE 2,5-3). Originally it was thought to welding generator that is immediately revealed, however, not suitable because of the welding voltages are too high and the current is alternating and therefore not able to maintain a stable arc. | |
| the galvanizing Nell'AE to the spray frequency is 18KHZ and during the alternation of the cycle the plasma between the two ends of the wires (electrodes) it contracts and expands, creating a resistance followed by a current button. The impedance of the transformer must be able to adapt to this behavior, but unfortunately the transformer of the welder does not have this ability to adattamento.E’ It was therefore necessary to build a transformer specially designed, capable of ensuring a stable arc at low voltages without strong voltage drops. | |
| The WELDERS to AC arc are static converters, which transforms the current at a voltage of 80V (manual welding) and to 100 In (automatic welding) with high intensity current (100- 700A), the arc is extinguished at each half cycle when the voltage wave passes through zero. The ballast provides with the accumulated energy for the induction to the arc restriking to each current reversal in the middle of an inverter . The alternating current in this case is required because it allows the electrode cooling in the half cycles in which the flow of electrons is reversed. | |
| other differences | |
| In welding the feed device is simple because only a question of wire. In spray metals, the wires (electrodes) They are two that must travel at the same speed to occur simultaneously at the point of contact (breakdown voltage). The slightest irregularity or speed difference causes an unstable arc and coarse particles. The wire feed mechanism must not affect the surface or create burrs and indentations that may be caused by an irregular or non-uniform pressure on the rollers resulting in arc instability because the cross section of the wires is no longer continuous. |