New to 2019 is Jasic's TIG 315 Pro Pulse AC/DC Multi Wave 415V 3-phase inverter TIG welder. The new 'Multi Wave' technology is an updated modern version of the Lincoln Electric's 'Square Wave' AC/DC TIG welder. The various 'Multi' wave forms available are used in AC for welding aluminium, and are fine tuned settings for achieving better results when welding aluminium.
The different AC waves forms on offer with this 315P Multi Wave Pro is a process that allows the operator to set the welder to weld thicker aluminium a lot quicker, cleaner, with less impurities in the weld pool, with more penetration, and can enable the operator to weld badly fitting materials with gaps, without problems. At Spectrum, we have customers who TIG weld aluminium everyday using Multi Wave TIG inverter welders, and we've seen them having to use the various AC waves forms, which have been the difference between the job being a failure or a success.
This digital setting is active in AC TIG mode only. It is used to set the amount of cleaning and/or penetration produced during an AC TIG weld. If manual adjustment is desired, the balance can be adjusted from MIN (maximum cleaning) to MAX (maximum penetration). When the AC balance is 'BALANCED' on a middle setting for 50/50 cleaning and penetration, this is when the amounts of positive and negative are the same.
'Cleaning' is when the weld is provided with more positive current than negative current. Since the positive current produces the 'cleaning', or oxide removal on aluminium, this setting is used for welding on heavily oxidised aluminium.
CAUTION: Use only the amount of cleaning required, because the greater amount of positive current will heat the tungsten more and possibly cause it to melt or 'spit'. Also, the arc is usually more flared and less stable with more cleaning current. In general, use just enough "cleaning" to remove oxides and to give good wetting of the puddle.
'Penetration' provides more negative current than positive. The arc plasma will be more concentrated and more easily directed to where the heat is needed. Higher penetration settings allow a given size of tungsten to carry more current.