Welding flat bar to the edge of an angle

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I'm fabricating a powdercoating oven and I need to weld a flat bar (1.5" x 1/8" mild steel) to the edge of an angle (1.5" x 1.5" x 1/8" mild steel) over a length of 46".  I positioned everything with magnets a put a few tacks along the butt joint side.  To prevent warping due to the weld pulling on the metal what it the best way to go about it?  Should I start a the middle and work my way to the sides, alternating between a length of butt joint and a lenght of filet joint on the other side?  I tried one piece and started from one end to the other, alternating between butt and filet but I got some warping (the edge on the butt side is not totally flat).  Any information on how to go about this would be greatly appreciated, thanks in advance.
Reply:What machine are you using, what settings, what filler?John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:Originally Posted by MicroZoneWhat machine are you using, what settings, what filler?
Reply:How much weight ( stress) is going to be on this?  I would say stitch weld it.
Reply:Originally Posted by partagasHow much weight ( stress) is going to be on this?  I would say stitch weld it.
Reply:weld 1inch then move over 5inchs then weld 1 then move.This way you 1 on 6 weld.  Then turn it over and repeat.
Reply:like this.  but wider pacing.http://www.submarineboat.com/sub/ima...d1_compair.JPG
Reply:Originally Posted by partagaslike this.  but wider pacing.http://www.submarineboat.com/sub/ima...d1_compair.JPG
Reply:You should be able to get away with just the welds on the filet side.  But others might have more info.
Reply:Since, stress is minimal then do minimal welding.  I might consider welding on the but side after Vee-ing.  I would do this especially if this were part of the frame and sheet metal were going on the fillet side.  Breaking it back has also been discussed on this forum.  Essentially, offset the parts in the opposite direction of the warp and weld.  The metal will pull back to the correct position.  Also consider a lap joint.
Reply:I'm sure you've considered using "T" rather than angle, for these joints.
Reply:Originally Posted by denrepI'm sure you've considered using "T" rather than angle, for these joints.