buy really really little low amp rods turn it down real low and it will work , theres stuff called welding putty that acts as a heat sink seen bodyshops use it, i think it would work well in soaking up the heat .
i cut and welded my t bucket together it with a stick welder very slow tedious weld a spot here and move far away and weld it there and lined the metal with damp rags to soak the heat the idea is not to get it hot.
the above can be done but
next time i will buy a little mig and use it as i know it would do a better job