Just got myself a set of new floor pans for the 240Z, and i'm wondering if there are any tricks in welding them in and getting a nice job?

Take your time. Patience is the key word! Remember the old carpenter's saying, "Measure twice, cut once."

:beard: Sounds like Welding 101 or someone who has had recent experience......

Buy and use a grinder.

My floor pan patches do not look so good -- the 23 gauge wire with voltage set on the lowest setting was burning through. I ended up with lots of spots instead of a nice bead.

The grinder made it look a little better, but not perfect.

Take your time.

It is also a good idea to practice welding some scrap sheet metal to get your welder settings correct before you start welding on the car. Welding any thin sheet metal takes a fairly steady hand and lots of practice.

When you are cutting out the old floor pans, don't cut out the old floors to the correct size of the new ones, leave a little extra to allow for final fitting and trimming.

If you are using a Mig, use a gas set-up, not the flux core wire, it will be much, much easier to weld, and a leave a lot cleaner and stronger welds.