Hi Euan, mig welding is fine but don,t run your welder cold or you won't get enough penetration. Mig is low hydrogen so if your AP3 is prepared properly as in well ground and if it's been oxy cut get rid of all slagg.I have never had a problem welding AP3 to mild.
I post more pictures of the front welding. All those little things take time but I find it better to do them as I'm going. It gets a bit frustrating having to swap to different machines for componentry but the end result is worth it. School holidays are a bit of a work slowdown.
Colin.
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