VERY new to welding, angle iron tray question.

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Hey guys,I've only done a tiny bit of welding here and there, through a program in my school. Nothing more than practice MIG welds though.I'm working on a project to convert an old broken down Honda CB750 motorcycle to run on a forklift motor and some batteries. One of the essential components I need to weld is a tray to hold the aforementioned batteries. A very simple rectangular tray, approximately 8" wide by 18" long.The angle iron I purchased is 1/8" thick with 1.5" angle. I did a bit of searching and saw two preferred methods for fastening these two together. The first is a 45 degree miter, the other is to cope the angle and weld it that way.I'm also aware that due to the high heat, it will want to warp on me. For those guys who use this material often, do you have any words of wisdom for a new guy? I want it to be square and strong, but it doesn't necessarily have to be absolutely perfect. It will hold about 100 pounds all together.Thank you guys so much, I appreciate the help
Reply:to minimize warp, dont  get any spot too hot, move around, clamp it down..i think the cope will warp less than the mitre cut..
Reply:I recently had to make a couple frame-type trays for holding machines so they needed a flat bottom flange. I used the cope as it is easier to do without a high-end cutoff saw. You  can tack weld the corners of the cope and that seems to limit warping. I still got a little bit of a warp but nothing a whack or two with my big persuader couldn't fix.If you have not done the cope welds yet I have a story on them at the link below. It really is simple once you see it and then do it a time or two.http://www.newmetalworker.com/Howto/copejnts.htmlTom Hintz, publisherwww.newmetalworker.comLincoln Pro Mig 180Lincoln AC 255Determination