skotl
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Glad you've got the juice flowing, #6011
look forward to hearing how the full blown test goes!
As PTvor says, the greatest inrush of current is when the arc is struck. If the welder is on a dedicated circuit then you could consider changing the MCB from a B type (e.g. B16) to a C type (C16). B types trip between 3-5 x max current and C types trip between 5-10 x max current.
I'd caution against switching to a C type if it's not on a dedicated circuit (i.e. you have other run-of-the-mill devices plugged in to the same circuit) as there is a reason that B type MCBs are fitted for these.

As PTvor says, the greatest inrush of current is when the arc is struck. If the welder is on a dedicated circuit then you could consider changing the MCB from a B type (e.g. B16) to a C type (C16). B types trip between 3-5 x max current and C types trip between 5-10 x max current.
I'd caution against switching to a C type if it's not on a dedicated circuit (i.e. you have other run-of-the-mill devices plugged in to the same circuit) as there is a reason that B type MCBs are fitted for these.