32a type c mcb or rcbo will be absolutely fine looking at the plate on the machine (my welder runs of an rcbo and never had a problem) the type c ones are designed for high inrush curents (i.e. the 40a figure shown in book). rcbo may not be necessary and would cost more than an mcb, it is however good practice if trailing leads on shed floor or outside etc, guess its up to you to weigh up risks/cost.
There many things to consider when sizing cables but as long as its not a very long run 6mm should be plenty, if its short run many 4mm but 6mm isnt much more expensive. Just use a standard angled socket, its cheaper than the switched interlocked type, technically this is wrong as there is a risk of disconncting it under load but are you really lightly to unplug it whilst you are welding?
Completely agree with the comment about bootlace ferrels for the 2.5mm flex on the machine this ype of cable should always use them.
There many things to consider when sizing cables but as long as its not a very long run 6mm should be plenty, if its short run many 4mm but 6mm isnt much more expensive. Just use a standard angled socket, its cheaper than the switched interlocked type, technically this is wrong as there is a risk of disconncting it under load but are you really lightly to unplug it whilst you are welding?
Completely agree with the comment about bootlace ferrels for the 2.5mm flex on the machine this ype of cable should always use them.
