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All you need to know to weld with Flux Core also known as auto-protected tubular or hollow micro-wire.
In the MAG process welding can be done from right to left as well as from left to right, but in the flux core it is always recommended to use the left to right direction like in SMAW process, in general in welding auto-protected processes it is always advisable to weld from left to right, pushing the torch forward.
Like SMAW process, the Flux Core leaves a light layer of slag that can be easily removed, even in occasions just a brush.