So at this point I've flipped the {now 14 ft} piece over for the backside welding...The technique I'm using is simple with the heatsinks...Weld a few inches,skip a few, weld again...Clean the part and weld in the remaining areas...Sure beats fooling around and it actually took more time to get everything in place than the actual welding...The inside weld will be left as is for strength.....The last pic is one of the complete side showing ZERO warpage...I'm betting I could run one continious bead but I'm chicken !!! ...
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