john practice on some 1/8" mild steel (get it from a welding shop or even lowes) Once you feel comfortable buy some plates and I will send some scrap 4130 with the plates to practice on.
Personally it might be cheaper to rent a gas mig 220v for a weekend
I think VZ makes a great point here... practice a bit... a few hours of practice will really pay of in being able to lay down a nice bead, or at least get the settings on your welder close.
Fortunately this isn't aluminum and welding steel is pretty easy, although 4130 is a little trickier than mild steel. If you are anywhere near DC you can come over and use either my MIG or TIG setup.
save your money and go for the mig. Ive got a lincoln SP100 its got the gauges and hoses for the C25 gas. Ive done patch work for my chevelle and elcaminos. its much easier to do sheet metal with the gas. I even cut the cowl induction dome off a chevelle hood and welded it to a camaro hood, just to be different. Jim
Thats frigging impressive.. I have a lot of talents but welding is not one of them. Gotta learn.
Great post, never built a gun but I really want to, but hands down to you.
Welding really is simple for something like that. All you have to do is mess around with your wire feed speed and amount of heat you putting out. And always get your welds tied in at the begining of your weld. TIG welding I would think would be fairly easier for something like this "maybe" because it would be much cleaner leaving no splatter and require less grinding. Now if your welding pipes that is a different story because you have to purge it, but for sheet metal and such I'd recomend that. Either way this guy did a nice job.
generally novice welders using too light of a welder will find 4130 harder to run a smooth bead on.