i replaced quite a few patches on my T16 floor using normal mild steel plate and .8mm mig wire. i welded it normally in one run and had no problems.
the only time i got cracking of welds was doing short 1" welds on the 1/2" wading plates. it goes against what everyone else has said but i put it down to not enough heat transfer from the weld to the armour plate. i did a few large plate patches on the side armour with the mig turned up all the way and had no issues as i believe the original armour got hot and took longer to cool down helping to even things out.
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1941 mk1 mortar Carrier
1941 Mk1* Carrier
1942 Mk1* Carrier
1943 T16 Carrier
1945 Mk3 Dingo
1941 Mk3 Covenanter
1941 Mk4 Churchill AVRE (now sold)
1944 Mk6 Cromwell (now sold)
1952 Mk3 Centurion
1952 ARV Centurion
1952 ARV Centurion
1953 Mk3 Centurion (breaking)
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