Help with fence panels

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I have to build a fence. It will have pickets at 1/2" sq bar extended through 1" channel. One channel runs  parallel to the ground at top and bottom.My question.  What is a good method of minimizing/eliminating warpage? I would not have to straighten them after fabrication.  I am leaning toward pre-bending the panel.Thanks.
Reply:??? anybody got a good technique
Reply:Are you thinking the channels will warp?Dave J.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Not much warpag on the channel, as the hole is in the middle, and it doesn't need a huge wed to hold it together.
Reply:Thanks,  Perhaps I typically put too much weld/heat.  My panels do warp slightly, not off the table, but form a  slight "u" down in direction of welds.  It is slight but visable.
Reply:Heat control and clamping have worked best for me. One of my jigs consists of two pieces of 4" "H" beam (13 pound per foot) with 1 1/2" x 3/16" angle iron tabs tacked to the top. I space them accordingly, square/level them up, then clamp to my welding table. The channel then gets clamped to each tab. In situations where I'm not using punched channel, I lay a piece of 1/4" x 3/4" flat stock down so 1/2" pickets will be centered onto the channel. Once I have a section completely welded, I leave it clamped till cool then remove it from the jig.
Reply:Thanks.  My fixture looks similar to yours.  I have built some of the panels and I am quite satisfied with how they are looking.  Thanks for the suggestions.