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@Jung
For practice, I use regular mild steel. It welds just like 4130 and is a fraction of the price. I started on 20ga sheet but any old tubing will do. The technique is a bit different for mitred corners as you bridge across and need to modulate the heat as you go around.
I’m pissing around with Aluminium now which is a bit of a bugger…
Slow progress but I only started in May. OA with an old Smith AW1 torch. Lightweight hoses made a big difference for me.
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