These crosses require some welding. There are various techniques for welding (i.e. forge, MIG, Oxy-Acetylene), and I have taken a few classes in the various methods.
This is my Chile Forge "Tabasco" at full burn (~20 psi) ready to weld:
Last night, I forge-welded, which involves scarfing the two ends to be joined (tapering them to thin, flat ends which overlap), heating the metal to immediately below its melting point and using a powder called flux (borax) to impede oxidation and increase the chance that the weld will stick. Once the two ends get to "white-hot" in the forge, the piece comes quickly out of the forge and is hammered together to make the weld.
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