I worked at a place that did this for big highway signs. They cut holes
in the lower pipe so they could weld the two pipes more than just at the
top of the lower pipe. The pipe diameters were different enough that
they had to weld in spacers on the bottom of the upper pipe to fill the
gap, and get the top of the lower pipe red hot so they could hammer bend
the lip in enough to weld a joint.

If the two sizes of pipe are very close, then it is relatively simple.
I still suggest plug welding (drill hole in the lower pipe and then weld
the two pipes together and fill in the hole.) Weld all around at the
top of the upper pipe and you are done. Assuming 20 foot pipes, I would
probably overlap them 2 to 3 feet, so the assembled height would be 37
or 38 feet high, assuming two pipes.

Richard


stone wrote:
I want to make a pipe pole with larger diameter pipe
on the bottom and with a smaller diameter on top.

Is there a way to weld something like this together?

The only way I could think of was to have the smaller
diameter pipe run the entire length and use some sort
of bushing at both ends of the larger diameter. Making
the welds there.

Is there a slick way other than this?


Thanks.