Hey man.
Have a read through this thread here
http://forums.aussieveedubbers.com/viewtopic.php?tid=78783&page=1
It's for narrowing and lowering a beam, but the principles the same.
Make sure you clean the metal very thoroughly where you are going to weld. And ensure that there is no grease on the inside of the beam or this can contaminate your weld also.
When I did my current beam I used lengths of angle iron and stainless hose clamps on both beams to hold it all straight. You clamp them both and can weld most of the way round, then remove one piece of angle and finish one off. And let it cool. Then remove the other piece of angle and finish welding the second one off. Do not grind your welds down flat as it will remove a lot of the strength from your weld. You want them as strong as possible (ask me how I know)
It's a good idea to chamfer the edges of the join slightly to help with penetration. Make sure you run your welder pretty high and get a good deep weld on there.
As for positioning. When I did mine I set it so the lowest setting was slightly above stock ride height, and then it was all up from there! Lets be honest, in a Baja you don't want it low, so I didn't see why I would put them so you could go down to stock height!
And since then I've had them cranked up to max the whole time anyway. I've never adjusted them, they are actually rusted in place now.
I'm about to start doing a new beam for mine but I'm going to remove the adjusters and just put standard set screws in at the height I want.
There's some pictures of how I did my first beam on the first page of my build thread, But as I said above, DO NOT GRIND THE WELDS FLAT!!
You can skip to page 14 if you want to see the results from that. And on that note I would 357% recommend fitting some front end support bars. More info of that on page 14-15 too.
http://forums.aussieveedubbers.com/viewtopic.php?tid=80275&page=1
If you have any more question just ask!!
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If you said I was a Volkswagen man, you'd be right.