"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
. 3.70:

Yup... just lotsa-lotsa inert gas and a low enough amperage so that you
can have the weldment cool enough before leaving the gas shield.

Oh... it doesn't make a weldor happy to see the bottom-side of the work
catch fire, so gas should be applied to both sides of the work.

Lloyd