Tig weld it and use pure argon, and if you can rig a second outlet from your Argon supply, tape off one end of the pipe and push trough some small holes, then put your second Argon supply in from the other end and seal it inside either with masking tape on manufacture a bug that allows you to feed argon inside to purge the air out of the weld area. This greatly improves the quality of the weld.
Arfon
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