stick welding old thin header tubes?

If stick is the only way, 1/16" 6013 (mentioned previously) would be my choice. Somewhere in the 35 to 50 amp range. Base metal still would need to be solid, surface rust cleaned up but solid base metal.

:glasses7:
stick welder is too hot on header tubes,try brazing if you have a torch,mig or tig would be great,or a torch and a coat hanger works