Welding a barrel extension on the PP or any other gun will not satisfy the powers-that-be as mentioned earlier. Also, even if it was OK, you still need to be able to disassemble the gun for cleaning, maintainence etc. You would have to turn down the extension to the same exact diameter as the barrel so you can get it in and out of the slide. That would be going about it from the wrong end. When I had my PP done at Epps the process was fairly straightforward. The 'smith cut the old barrel off at the lug that mounts the barrel assembly to the frame. He then cut a piece of 9mm barrel blank to length, turned one end down a bit and drilled out the lug to match. He then soldered and pinned the new barrel to the old lug, cleaned up the chamber and blued the whole shebang. The old barrel was destroyed as per the CFC regs and the gun re-verified and re-registered. The machining work took less than an hour but the paper work took several weeks. I also had a Beretta 1934 done and it was pretty much the same story,however, the M1934 is a bit perculiar as the barrel comes out before the slide comes off. Therefore the 'smith had to slightly relieve the top of the inside of the slide so as to allow the longer barrel to come out of the gun. Not all small guns can be rebarreled but many can. Best to leave the job to the pros and let them deal with the paperwork! 
Here's the PP that Doug at Epps did for me - it has since found another home.
Here's the PP that Doug at Epps did for me - it has since found another home.

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